A method for forming a copper-aluminum composite pin-shaped row part

Abstract

The present invention relates to the field of metal profile processing technology, and in particular to a forming method of a copper-aluminum composite pin-type row-shaped part, comprising preparing a solid copper substrate and a semi-solid aluminum alloy liquid; preparing a forming mold, wherein the forming mold comprises a lower mold assembly, an upper mold assembly, an upper ejection mechanism, and a lower pressure mechanism; placing the solid copper substrate in the first space of the mold cavity, and then injecting the semi-solid aluminum alloy liquid into the first space to fill the copper substrate, and closing the mold; a two-way extrusion forming step: driving the solid copper substrate to move upward by the upper ejection mechanism, so that the solid copper substrate squeezes part of the semi-solid aluminum alloy liquid in the first space into the second space; applying downward pressure to the semi-solid aluminum alloy liquid in the second space by the lower pressure mechanism; cooling and forming to obtain a product. The method of the present invention realizes the metallurgical bonding of the copper substrate and the aluminum substrate and the forming of the aluminum needle column, improves production efficiency, effectively eliminates the uneven stress in the aluminum alloy liquid, and avoids cracks or deformation.

Description

Technical Field

[0001] The invention relates to the technical field of metal profile processing, and in particular to a forming method of a copper-aluminum composite pin-type row-shaped part. Background Art

[0002] Pin headers are widely used in electronic equipment, computer hardware, embedded systems and other fields to connect various modules, sensors, display screens and other components to the main control board. Pin headers can be classified according to their shape, size and arrangement. Common types include single-row pin headers, double-row pin headers, etc. In addition, pin headers have a variety of specifications to meet different application requirements. Pin headers have many advantages in heat dissipation, including efficient heat dissipation, space optimization, low-noise operation, long life and reliability, energy saving and environmental protection, and wide applicability. These characteristics make pin headers an important part of the heat dissipation solution for modern electronic equipment.

[0003] In the related art, application number CN202211214231.3 discloses a radiator and a vehicle, wherein the radiator includes a liquid cooling plate and a heat conducting plate, wherein the liquid cooling plate has a cooling cavity; the heat conducting plate includes a substrate and a plurality of pins, wherein the substrate includes a first surface and a second surface opposite to each other, wherein the first surface is provided with a plurality of spaced pins, and the second surface is used to provide the heat dissipation parts. The heat conducting plate has the following technical disadvantages: the copper-aluminum composite rolled plate is produced by a semi-molten rolling composite method, and then forged, cut and processed. This series of process flows is relatively complicated, and each step of the process requires precise control, otherwise it may affect the quality of the final product. The complicated process flow may also lead to reduced production efficiency and increased production costs. In addition, scraps and waste may be generated during the rolling, forging and cutting processes, resulting in material waste, which not only increases production costs, but is also not conducive to environmental protection and sustainable development. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one of the purposes of the present invention is to provide a method for forming a copper-aluminum composite pin-type row-shaped part, which realizes the metallurgical bonding of the copper substrate and the aluminum substrate and the forming of the aluminum pin column through a specific mold design and a bidirectional extrusion molding process, significantly improves the production efficiency, and greatly simplifies the production process through a one-time molding operation. In addition, the method can effectively eliminate the uneven stress in the aluminum alloy liquid through the bidirectional extrusion molding process, thereby avoiding cracks or deformation of the product during the solidification process.

[0005] The first aspect of the present invention provides a method for forming a copper-aluminum composite pin-shaped row, the method comprising:

[0006] S10, preparing a solid copper substrate and a semi-solid aluminum alloy liquid;

[0007] S20, preparing a molding die, wherein the molding die includes a lower mold assembly, an upper mold assembly, an upper push mechanism and a lower pressing mechanism; wherein the lower mold assembly includes a lower mold core, and the upper mold assembly includes an upper mold core; the upper mold core and the lower mold core are enclosed to form a mold cavity, and the mold cavity includes a first space for accommodating a solid copper substrate and a semi-solid aluminum alloy liquid and a second space for molding a plurality of aluminum needle columns;

[0008] S30, placing a solid copper substrate in the first space of the cavity, then injecting semi-solid aluminum alloy liquid into the first space to fill the copper substrate, and then closing the mold;

[0009] S40, bidirectional extrusion molding step: driving the solid copper substrate upward by the lifting mechanism so that the solid copper substrate squeezes part of the semi-solid aluminum alloy liquid in the first space into the second space; applying downward pressure to the semi-solid aluminum alloy liquid in the second space by the pressing mechanism;

[0010] S50, after completing the bidirectional extrusion molding step, cooling the molding to obtain a product.

[0011] In the first aspect of the present invention, as a preferred embodiment, in step S20,

[0012] The lower mold assembly further comprises a lower mold mounting seat and a lower mold plate, wherein the lower mold plate is mounted on the lower mold mounting seat, and the lower mold core is mounted on the lower mold plate;

[0013] The upper die assembly comprises an upper die mounting seat and an upper die plate; the upper die mounting seat is mounted on the lower die mounting seat, the upper die plate is mounted on the upper die mounting seat, and the upper die core is mounted on the upper die plate;

[0014] The upper ejection mechanism is installed on the lower mold mounting seat, and the upper ejection mechanism includes a plurality of ejector rods penetrating the lower mold core and an upper ejection driving mechanism, and the upper ejection driving mechanism is used to drive the ejector rods to move up and down relative to the lower mold core in the height direction. When the upper ejection driving mechanism drives the ejector rods to move upward, the ejector rods drive the solid copper substrate to move upward, so that the solid copper substrate squeezes part of the semi-solid aluminum alloy liquid in the first space into the second space;

[0015] The upper surface of the lower mold core is formed with a recessed portion, the bottom surface of the upper mold core is extended downward to form a raised portion, and the upper mold core is provided with a plurality of needle-column-shaped through holes arranged at intervals at positions corresponding to the raised portions; the first space is formed by enclosing the raised portion and the recessed portion, and the second space is formed by a plurality of needle-column-shaped through holes respectively connected to the first space;

[0016] The pressing mechanism includes a plurality of ejector pins penetrating the upper mold core and a pressing drive mechanism. The plurality of ejector pins are connected one by one in the plurality of needle-column-shaped through holes. The pressing drive mechanism is used to drive the ejector pins to move up and down in the height direction relative to the upper mold core, so that part of the ejector pins moves up and down in the needle-column-shaped through holes, so as to adjust the height of the semi-solid aluminum alloy liquid in the second space and seal the upper end of the needle-column-shaped through holes.

[0017] In the first aspect of the present invention, as a preferred embodiment, the ejector pin and the needle-shaped through hole form an exhaust gap, and the diameter of the exhaust gap is 3-6 microns;

[0018] Before step S40, the bidirectional extrusion molding step, an exhaust step is also included: the solid copper substrate is driven to move upward to a first position by an upper push mechanism, so that the first part of the semi-solid aluminum alloy liquid in the first space is squeezed into the second space, and at the same time, the air in the first space is discharged outward from the exhaust gap; wherein, the pressure applied by the upper push mechanism is less than 5 tons, the pressure application time is 0.1-0.5 seconds, and the height of the semi-solid aluminum alloy liquid entering the second space is less than 5% of the height of the aluminum needle column.

[0019] In the first aspect of the present invention, as a preferred embodiment, in step S40, the bidirectional extrusion molding step, the solid copper substrate is driven to move upward to the second position by the upper push mechanism, so that the solid copper substrate squeezes the second part of the semi-solid aluminum alloy liquid in the first space into the second space; wherein the upper push mechanism applies a pressure of 400-500 tons, the pressure application time is 60-180 seconds, and the total height of the first part of the semi-solid aluminum alloy liquid and the second part of the semi-solid aluminum alloy liquid entering the second space is the preset height of the aluminum needle column.

[0020] In the first aspect of the present invention, as a preferred embodiment, in step S40, the bidirectional extrusion molding step, it also includes a heating step: heating the workpiece to be formed by heat conduction through a heating component; wherein the heating component is embedded in the upper mold core and / or the lower mold core, and the heating component is used to heat the upper mold core and / or the lower mold core.

[0021] In the first aspect of the present invention, as a preferred embodiment, in step S40, the bidirectional extrusion molding step, it also includes: obtaining the temperature of the semi-solid aluminum alloy liquid in the first space through a temperature sensor, and when the temperature of the semi-solid aluminum alloy liquid is lower than a preset temperature value, controlling the heating component to heat the upper mold core and / or the lower mold core; wherein the temperature sensor is embedded in the upper mold core and / or the lower mold core, and the temperature sensor is used to detect the temperature in the mold cavity.

[0022] In the first aspect of the present invention, as a preferred embodiment, in step S40, the bidirectional extrusion molding step, it also includes: obtaining the flow pressure of the semi-solid aluminum alloy liquid in the first space through a pressure sensor, and when the flow pressure of the semi-solid aluminum alloy liquid is less than a preset pressure value, controlling the upper push mechanism and / or the lower pressure mechanism to increase the applied pressure; wherein, the pressure sensor is embedded in the upper mold core and / or the lower mold core, and the pressure sensor is used to detect the flow pressure of the semi-solid aluminum alloy liquid in the mold cavity.

[0023] In the first aspect of the present invention, as a preferred embodiment, a plurality of dovetail grooves distributed at intervals are formed on the upper surface of the copper substrate.

[0024] In the first aspect of the present invention, as a preferred embodiment, the upper push driving mechanism includes an upper push electric cylinder, a first lifting plate connected to the output shaft of the upper push electric cylinder, and a first locking block. A plurality of push rods are inserted into a preset mounting hole on the first lifting plate. The lower end of the push rod is provided with a limiting flange placed under the first lifting plate and abutting against the first lifting plate. The first locking block is fixed to the first lifting plate by a first bolt and cooperates with the first lifting plate to clamp and fix the limiting flange. The upper push electric cylinder drives the first lifting plate to move upward in the height direction, and the first lifting plate drives the push rod to move upward in the height direction relative to the lower mold core. The push rod drives the solid copper base plate to move upward, so that the solid copper base plate squeezes part of the semi-solid aluminum alloy liquid in the first space into the second space.

[0025] In the first aspect of the present invention, as a preferred embodiment, the downward pressure driving mechanism includes a downward pressure electric cylinder, a second lifting plate connected to the output shaft of the downward pressure electric cylinder, and a second locking block, a plurality of ejectors are inserted into preset mounting holes on the second lifting plate, and the upper end of the ejector is provided with a limiting flange placed under the second lifting plate and abutting against the second lifting plate, the second locking block is fixed to the second lifting plate by a second bolt and cooperates with the second lifting plate to clamp and fix the limiting flange.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The method of the present invention can efficiently realize the metallurgical bonding of the copper substrate and the aluminum alloy liquid through a specific mold design and a bidirectional extrusion molding process, and simultaneously form a precise aluminum needle column. Specifically, the design of the first space ensures close contact between the copper substrate and the aluminum alloy liquid, providing good conditions for the metallurgical bonding of the two. During the bidirectional extrusion process, the copper substrate squeezes part of the semi-solid aluminum alloy liquid into the first space, which not only promotes the atomic diffusion between copper and aluminum, but also facilitates the formation of a stable metallurgical bonding interface. The second space is specifically used for the molding of the aluminum needle column. Through precise mold design and bidirectional extrusion process, it can be ensured that the shape, size and position of the aluminum needle column meet the predetermined requirements. Using semi-solid aluminum alloy liquid as a raw material, it has good fluidity and is easy to fill the mold, thereby ensuring the molding quality of the aluminum needle column. In addition, during the solidification process of the aluminum alloy liquid, due to the influence of factors such as temperature gradient and material shrinkage, uneven stress distribution will be generated. If these stresses are not eliminated in time, it is easy to cause cracks or deformation in the product. The bidirectional pressure method can redistribute and balance the stress in the aluminum alloy liquid by applying uniform pressure to the material, thereby effectively eliminating these uneven stresses. Bidirectional pressure can also make the aluminum alloy liquid more tightly combined and improve the density of the product. This can not only enhance the mechanical properties of the product, but also reduce the generation of internal defects and pores, thereby improving the overall quality of the product. During the solidification process of the aluminum alloy liquid, cracks are easily generated due to the stress changes and temperature gradients inside the material. Bidirectional pressure can reduce the risk of cracks by balancing the stress distribution inside the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a flowchart of the molding method of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the molding die of the present invention;

[0030] Figure 3 is a cross-sectional view of a molding die of the present invention;

[0031] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of the A part;

[0032] Figure 5 It is a structural schematic diagram of the lower mold assembly, the upper mold assembly, the upper push mechanism and the lower pressing mechanism of the present invention;

[0033] Figure 6 It is a cross-sectional view of the lower mold assembly, the upper mold assembly, the upper push mechanism and the lower pressing mechanism of the present invention;

[0034] Figure 7 It is a schematic structural diagram of the copper-aluminum composite pin-type row-shaped component of the present invention.

[0035] In the figure: 10, lower mold assembly; 11, lower mold mounting seat; 12, lower mold plate; 13, lower mold core; 131, recessed portion; 20, upper mold assembly; 21, upper mold mounting seat; 22, upper mold plate; 23, upper mold core; 231, raised portion; 232, needle-shaped through hole; 30, cavity; 31, first space; 32, second space; 40, upper ejection mechanism; 41, ejector rod; 42, upper ejection drive mechanism; 421, upper ejection electric cylinder output shaft; 422. First lifting plate; 423. First locking block; 50. Heating assembly; 51. Electric heating tube; 60. Pressing mechanism; 61. Ejector pin; 62. Pressing drive mechanism; 621. Pressing electric cylinder output shaft; 622. Second lifting plate; 623. Second locking block; 70. Pressure sensor; 80. Temperature sensor; 90. Copper-aluminum composite needle-type row piece; 91. Copper base plate; 911. Dovetail groove; 92. Aluminum base plate; 93. Aluminum needle column. DETAILED DESCRIPTION

[0036] Below, in conjunction with the accompanying drawings and specific embodiments, the invention is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except as otherwise specified, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0037] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] Please refer to Figure 1 As shown, this embodiment provides a method for forming a copper-aluminum composite pin-shaped row, the method comprising:

[0041] S10, preparing a solid copper substrate and a semi-solid aluminum alloy liquid;

[0042] S20, preparing a molding die, the molding die comprising a lower die assembly, an upper die assembly, an upper push mechanism and a lower pressing mechanism; wherein the lower die assembly comprises a lower die core, and the upper die assembly comprises an upper die core; the upper die core and the lower die core are enclosed to form a cavity, the cavity comprising a first space for accommodating a solid copper substrate and a semi-solid aluminum alloy liquid and a second space for forming a plurality of aluminum needle columns;

[0043] S30, placing a solid copper substrate in the first space of the cavity, then injecting semi-solid aluminum alloy liquid into the first space to fill the copper substrate, and then closing the mold;

[0044] S40, bidirectional extrusion molding step: driving the solid copper substrate upward by the lifting mechanism so that the solid copper substrate squeezes part of the semi-solid aluminum alloy liquid in the first space into the second space; applying downward pressure to the semi-solid aluminum alloy liquid in the second space by the pressing mechanism;

[0045] S50, after completing the bidirectional extrusion molding step, cooling the molding to obtain a product.

[0046] On the basis of the above method, the method of the present invention can efficiently realize the metallurgical bonding of the copper substrate and the aluminum alloy liquid through a specific mold design and a bidirectional extrusion molding process, and simultaneously form a precise aluminum needle column. Specifically, the design of the first space ensures the close contact between the copper substrate and the aluminum alloy liquid, providing good conditions for the metallurgical bonding of the two. During the bidirectional extrusion process, the copper substrate squeezes part of the semi-solid aluminum alloy liquid into the first space, which not only promotes the atomic diffusion between copper and aluminum, but also helps to form a stable metallurgical bonding interface. The second space is specifically used for the molding of the aluminum needle column. Through precise mold design and bidirectional extrusion process, it can be ensured that the shape, size and position of the aluminum needle column meet the predetermined requirements. Using semi-solid aluminum alloy liquid as a raw material, it has good fluidity and is easy to fill the mold, thereby ensuring the molding quality of the aluminum needle column. In addition, during the solidification process of the aluminum alloy liquid, due to the influence of factors such as temperature gradient and material shrinkage, uneven stress distribution will be generated. If these stresses are not eliminated in time, it is easy to cause cracks or deformation in the product. The bidirectional pressure method can redistribute and balance the stress in the aluminum alloy liquid by applying uniform pressure to the material, thereby effectively eliminating these uneven stresses. Bidirectional pressure can also make the aluminum alloy liquid more tightly combined and improve the density of the product. This can not only enhance the mechanical properties of the product, but also reduce the generation of internal defects and pores, thereby improving the overall quality of the product. During the solidification process of the aluminum alloy liquid, cracks are easily generated due to the stress changes and temperature gradients inside the material. Bidirectional pressure can reduce the risk of cracks by balancing the stress distribution inside the material.

[0047] Please refer to Figure 2-7 As shown, in a preferred embodiment of the present invention, in step S20,

[0048] The lower mold assembly 10 further includes a lower mold mounting seat 11 and a lower mold plate 12, the lower mold plate 12 is mounted on the lower mold mounting seat 11, and the lower mold core 13 is mounted on the lower mold plate 12;

[0049] The upper mold assembly 20 includes an upper mold mounting seat 21 and an upper mold plate 22; the upper mold mounting seat 21 is mounted on the lower mold mounting seat 11, the upper mold plate 22 is mounted on the upper mold mounting seat 21, and the upper mold core 23 is mounted on the upper mold plate 22;

[0050] The upper ejection mechanism 40 is installed on the lower mold mounting seat 11. The upper ejection mechanism 40 includes a plurality of ejector rods 41 penetrating the lower mold core 13 and an upper ejection driving mechanism 42. The upper ejection driving mechanism 42 is used to drive the ejector rods 41 to move up and down relative to the lower mold core 13 along the height direction. When the upper ejection driving mechanism 42 drives the ejector rods 41 to move upward, the ejector rods 41 drive the solid copper substrate 91 to move upward, so that the solid copper substrate 91 squeezes part of the semi-solid aluminum alloy liquid in the first space 31 into the second space 32.

[0051] A recessed portion 131 is formed on the upper surface of the lower mold core 13, and a raised portion 231 is formed on the bottom surface of the upper mold core 23 extending downward. A plurality of needle-column-shaped through holes 232 arranged at intervals are provided on the upper mold core 23 at positions corresponding to the raised portions 231; the first space 31 is formed by the raised portions 231 and the recessed portion 131, and the second space 32 is formed by a plurality of needle-column-shaped through holes 232 respectively connected to the first space 31. The recessed portion 131 of the lower mold core 13 cooperates with the raised portion 231 of the upper mold core 23 to accurately locate and fix the copper substrate 91, ensuring that the copper substrate 91 will not move or misalign during the molding process. This design not only improves the precision of the product, but also ensures the stability of the molding process. The needle-column-shaped through holes 232 provided on the upper mold core 23 correspond to the raised portions 231, and these through holes play a key role in the molding process. They not only form spaces for the aluminum needle columns 93 , but also ensure that the aluminum alloy liquid can flow into these spaces evenly and accurately, thereby forming precise aluminum needle columns 93 .

[0052] The pressing mechanism 60 includes a plurality of ejector pins 61 penetrating the upper mold core 23 and a pressing driving mechanism 62. The plurality of ejector pins 61 are connected one by one to the plurality of needle-column-shaped through holes 232. The pressing driving mechanism 62 is used to drive the ejector pins 61 to move up and down in the height direction relative to the upper mold core 23, so that part of the ejector pins 61 moves up and down in the needle-column-shaped through holes 232 to adjust the height of the semi-solid aluminum alloy liquid in the second space 32 and seal the upper end of the needle-column-shaped through holes 232.

[0053] In this embodiment, the copper-aluminum composite needle array 90 includes a substrate, which includes a copper substrate 91 and an aluminum substrate 92 metallurgically bonded to the surface of the copper substrate 91; a plurality of spaced aluminum needle columns 93 are formed on the aluminum substrate 92. Preferably, a plurality of spaced dovetail grooves 911 are formed on the upper surface of the copper substrate 91. By providing the dovetail grooves 911 on the copper substrate 91, the contact area with the aluminum alloy liquid is increased. This design not only provides more connection points, but also makes the connection interface more solid, thereby enhancing the stability of the connection. The special shape of the dovetail groove 911 can produce a mechanical locking effect. When the aluminum alloy liquid flows into the groove and solidifies, it forms a mutually interlocking structure with the copper substrate 91. This structure can effectively resist the influence of external forces (such as vibration, impact, etc.) on the connection and maintain the stability of the connection.

[0054] On the basis of the above structure, in the actual application process, the upper mold assembly 20 is lifted by means of an external lifting device, the solid copper substrate 91 is placed in the first space 31 of the cavity 30, the semi-solid aluminum alloy liquid is injected into the cavity 30, and filled on the copper substrate 91, and then the upper mold assembly 20 is lowered by the external lifting device to complete the mold closing. The upper ejection mechanism 40 is started, and the upper ejection drive mechanism 42 drives the ejector rod 41 to move upward, and the ejector rod 41 drives the solid copper substrate 91 to move upward. In this process, the copper substrate 91 squeezes part of the semi-solid aluminum alloy liquid in the first space 31 into the second space 32 to form an aluminum needle column 93. After a period of cooling, the copper-aluminum composite needle-type row-shaped part 90 reaches sufficient strength, and the mold can be opened at this time, and then the molded product can be ejected from the first space 31 by the upper ejection mechanism 40 to complete the demolding operation. In this process, the copper substrate 91 squeezes part of the semi-solid aluminum alloy liquid in the first space 31 into the second space 32 to form the aluminum needle column 93. The first space 31 is used for metallurgical bonding of the copper substrate 91 and the aluminum alloy liquid, while the second space 32 is specifically used to form the aluminum needle column 93, which not only ensures the accuracy of molding, but also improves production efficiency. The mold can complete the metallurgical bonding of the copper substrate 91 and the aluminum substrate 92 and the molding of the aluminum needle column 93 at one time, greatly improving production efficiency.

[0055] In addition, the pressing mechanism 60 can indirectly affect the distribution and height of the semi-solid aluminum alloy liquid in the second space 32 by controlling the position of the ejector pin 61 in the needle-column-shaped through hole 232. When the ejector pin 61 moves downward under the action of the pressing drive mechanism 62, it will increase the extrusion of the aluminum alloy liquid in the second space 32, causing the height of the aluminum alloy liquid to decrease; conversely, when the ejector pin 61 moves upward, it will reduce the extrusion of the aluminum alloy liquid, thereby increasing the height of the aluminum alloy liquid. Another important function of the ejector pin 61 is to block the upper end of the needle-column-shaped through hole 232. By moving the ejector pin 61 to the upper end of the needle-column-shaped through hole 232, the ejector pin 61 can effectively block the needle-column-shaped through hole 232, preventing the aluminum alloy liquid from leaking or overflowing through the needle-column-shaped through hole 232, thereby ensuring the smooth progress of the processing process. In summary, the downward pressure mechanism 60 not only adjusts the height of the semi-solid aluminum alloy liquid in the second space 32 by precisely controlling the position and movement of the ejector pin 61 in the needle-column-shaped through hole 232, but also effectively blocks the needle-column-shaped through hole 232, thereby ensuring the stability of the entire processing process and the quality of the product. The downward pressure mechanism 60 applies downward pressure to the aluminum alloy liquid through the ejector pin 61, while the upward pressure mechanism 40 applies upward pressure to the aluminum alloy liquid through the ejector pin 41 and the solid copper substrate 91. This two-way pressure method can effectively eliminate the uneven stress in the aluminum alloy liquid and avoid cracks or deformation of the product during the solidification process.

[0056] In a preferred embodiment of the present invention, an exhaust gap is formed between the ejector pin 61 and the needle-shaped through hole 232, and the diameter of the exhaust gap is 3-6 microns;

[0057] Before step S40, the bidirectional extrusion molding step, an exhaust step is also included: the solid copper substrate 91 is driven to move upward to the first position by the upper push mechanism 40, so that the first part of the semi-solid aluminum alloy liquid in the first space 31 is squeezed into the second space 32, and at the same time, the air in the first space 31 is discharged outward from the exhaust gap; wherein, the upper push mechanism 40 applies a pressure of less than 5 tons, the pressure application time is 0.1-0.5 seconds, and the height of the semi-solid aluminum alloy liquid entering the second space 32 is less than 5% of the height of the aluminum needle column 93.

[0058] Within this size range, it is ensured that the gas can be effectively discharged from this gap while preventing the aluminum alloy liquid from leaking through this gap. The pressure applied by the upper push mechanism 40 in the exhaust step is controlled below 5 tons. This pressure value can ensure that the air is effectively exhausted without causing unnecessary damage to the mold or material. The pressure application time is set to 0.1-0.5 seconds, which is a short but sufficient time window that allows air to be exhausted without affecting the overall molding cycle. The height of the semi-solid aluminum alloy liquid entering the second space 32 is limited to less than 5% of the height of the aluminum needle column 93. This limitation ensures that the exhaust step will not interfere with the subsequent bidirectional extrusion molding step.

[0059] In a preferred embodiment of the present invention, in step S40, the bidirectional extrusion molding step, the solid copper substrate 91 is driven to move upward to the second position by the upper push mechanism 40, so that the solid copper substrate 91 squeezes the second part of the semi-solid aluminum alloy liquid in the first space 31 into the second space 32; wherein, the upper push mechanism 40 applies a pressure of 400-500 tons, and the pressure application time is 60-180 seconds, and the total height of the first part of the semi-solid aluminum alloy liquid and the second part of the semi-solid aluminum alloy liquid entering the second space 32 is the preset height of the aluminum needle column 93.

[0060] In this step, the pressure applied by the upper push mechanism 40 is significantly increased to 400-500 tons. This pressure range is to ensure that the aluminum alloy liquid can fully fill the cavity 30 and form a strong bond with the copper substrate 91. The pressure application time is controlled between 60-180 seconds, which allows the aluminum alloy liquid to stably fill the cavity 30 under pressure and form a structurally complete aluminum needle column 93. As the copper substrate 91 moves upward, the second part of the semi-solid aluminum alloy liquid in the first space 31 is squeezed into the second space 32. Combined with the first part of the aluminum alloy liquid that has entered the second space 32 in the previous exhaust step, these two parts of the aluminum alloy liquid together constitute the main body of the aluminum needle column 93.

[0061] In a preferred embodiment of the present invention, in step S40, the bidirectional extrusion molding step, a heating step is also included: heating the workpiece to be formed is achieved by heat conduction through a heating component 50; wherein the heating component 50 is embedded in the upper mold core 23 and / or the lower mold core 13, and the heating component 50 is used to heat the upper mold core 23 and / or the lower mold core 13.

[0062] On the basis of the above structure, the mold is heated by the heating component 50, and the heating component 50 maintains a suitable temperature to ensure that the aluminum alloy liquid maintains good fluidity, and ensures that the copper substrate 91 and the aluminum alloy liquid can reach a suitable temperature during metallurgical bonding, thereby improving the copper-aluminum composite effect and ensuring the quality and performance of the product. Preferably, the heating component 50 includes a plurality of electric heating tubes 51 evenly distributed inside the upper mold core 23 and the lower mold core 13. The uniformity and accuracy of mold heating can be ensured, thereby improving product quality and production efficiency, and can also effectively avoid damage to the mold due to local overheating, thereby extending the service life of the mold.

[0063] In a preferred embodiment of the present invention, in step S40, the bidirectional extrusion molding step, it also includes: obtaining the temperature of the semi-solid aluminum alloy liquid in the first space 31 through the temperature sensor 80, when the temperature of the semi-solid aluminum alloy liquid is less than the preset temperature value, controlling the heating component 50 to heat the upper mold core 23 and / or the lower mold core 13; wherein the temperature sensor 80 is embedded in the upper mold core 23 and / or the lower mold core 13, and the temperature sensor 80 is used to detect the temperature in the cavity 30.

[0064] In a preferred embodiment of the present invention, in step S40, the bidirectional extrusion molding step, it also includes: obtaining the flow pressure of the semi-solid aluminum alloy liquid in the first space 31 through the pressure sensor 70, when the flow pressure of the semi-solid aluminum alloy liquid is less than the preset pressure value, controlling the upper push mechanism 40 and / or the lower pressure mechanism 60 to increase the applied pressure; wherein the pressure sensor 70 is embedded in the upper mold core 23 and / or the lower mold core 13, and the pressure sensor 70 is used to detect the flow pressure of the semi-solid aluminum alloy liquid in the cavity 30.

[0065] In a preferred embodiment of the present invention, the upper push driving mechanism 42 includes an upper push electric cylinder, a first lifting plate 422 connected to the output shaft 421 of the upper push electric cylinder, and a first locking block 423. A plurality of push rods 41 are inserted into a preset mounting hole on the first lifting plate 422. The lower end of the push rod 41 is provided with a limiting flange placed below the first lifting plate 422 and abutting against the first lifting plate 422. The first locking block 423 is fixed to the first lifting plate 422 by a first bolt and cooperates with the first lifting plate 422 to clamp and fix the limiting flange; the upper push electric cylinder drives the first lifting plate 422 to move upward in the height direction, and the first lifting plate 422 drives the push rod 41 to move upward in the height direction relative to the lower mold core 13. The push rod 41 drives the solid copper substrate 91 to move upward, so that the solid copper substrate 91 squeezes part of the semi-solid aluminum alloy liquid in the first space 31 into the second space 32.

[0066] On the basis of the above structure, the upper electric cylinder starts to work, driving the first lifting plate 422 to move upward in the height direction. The upward movement of the first lifting plate 422 drives the ejector rod 41 connected in the mounting hole to move upward together. Since the limiting flange at the lower end of the ejector rod 41 is tightly fixed by the first lifting plate 422 and the first locking block 423, the ejector rod 41 can stably and accurately transmit the movement of the first lifting plate 422. As the ejector rod 41 rises, they begin to contact the solid copper substrate 91 and push it to move upward. In this process, the solid copper substrate 91 squeezes part of the semi-solid aluminum alloy liquid in the first space 31 into the second space 32. When the first lifting plate 422 and the ejector rod 41 reach the preset height, the upper electric cylinder stops working and completes an extrusion action. At this time, the extruded semi-solid aluminum alloy liquid has formed the desired shape or structure in the second space 32. Through this design, the upper driving mechanism 42 can achieve efficient and accurate extrusion operation, and at the same time, the stability and reliability of the mechanism are also effectively guaranteed. When the push rod 41 is deformed or otherwise damaged, the bolts fixing the first locking block 423 and the first lifting plate 422 can be loosened to disassemble the push rod 41 so as to replace it with a new one.

[0067] In a preferred embodiment of the present invention, the downward pressure driving mechanism 62 includes a downward pressure electric cylinder, a second lifting plate 622 connected to the output shaft 621 of the downward pressure electric cylinder, and a second locking block 623. A plurality of ejectors 61 are inserted into a preset mounting hole on the second lifting plate 622. The upper end of the ejector 61 is provided with a limiting flange placed below the second lifting plate 622 and abutting against the second lifting plate 622. The second locking block 623 is fixed to the second lifting plate 622 by a second bolt and cooperates with the second lifting plate 622 to clamp and fix the limiting flange.

[0068] On the basis of the above structure, the downward pressure electric cylinder starts to work, driving the second lifting plate 622 to move downward in the height direction. As the second lifting plate 622 descends, the ejector pin 61 inserted into the mounting hole also moves downward. Since the limiting flange at the upper end of the ejector pin 61 is tightly fixed by the second lifting plate 622 and the second locking block 623, the ejector pin 61 can stably and accurately transmit the movement of the second lifting plate 622. The ejector pin 61 is pressed down to apply pressure to the aluminum alloy liquid in the mold. By adjusting the force and speed of the downward pressure, the shape and density of the aluminum alloy liquid can be controlled. When the ejector pin 61 and the second lifting plate 622 reach the preset position, the downward pressure electric cylinder stops working and completes a downward pressure action. At this time, the aluminum alloy liquid has been evenly compressed to the required shape and density. Through this design, the downward pressure drive mechanism 62 can realize efficient and accurate downward pressure operation, and work in conjunction with the upper ejection mechanism 40 to ensure that the aluminum alloy liquid is more evenly stressed during the processing process, thereby improving the quality of the product.

[0069] Although only certain components and embodiments of the present application have been illustrated and described, many modifications and changes may be conceived by those skilled in the art without actually departing from the scope and spirit of the claims, such as changes in the size, dimensions, structure, shape and proportion of the various elements, mounting arrangements, material usage, color, orientation, etc.

[0070] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A method for forming a copper-aluminum composite pin-shaped row, characterized in that: The method comprises: S10, preparing a solid copper substrate and a semi-solid aluminum alloy liquid; S20, preparing a molding die, wherein the molding die includes a lower mold assembly, an upper mold assembly, an upper push mechanism and a lower pressing mechanism; wherein the lower mold assembly includes a lower mold core, and the upper mold assembly includes an upper mold core; the upper mold core and the lower mold core are enclosed to form a mold cavity, and the mold cavity includes a first space for accommodating a solid copper substrate and a semi-solid aluminum alloy liquid and a second space for molding a plurality of aluminum needle columns; S30, placing a solid copper substrate in the first space of the cavity, then injecting semi-solid aluminum alloy liquid into the first space to fill the copper substrate, and then closing the mold; S40, bidirectional extrusion molding step: driving the solid copper substrate upward by the lifting mechanism so that the solid copper substrate squeezes part of the semi-solid aluminum alloy liquid in the first space into the second space; applying downward pressure to the semi-solid aluminum alloy liquid in the second space by the pressing mechanism; S50, after completing the bidirectional extrusion molding step, cooling the molding to obtain a product; In step S20, The lower mold assembly further comprises a lower mold mounting seat and a lower mold plate, wherein the lower mold plate is mounted on the lower mold mounting seat, and the lower mold core is mounted on the lower mold plate; The upper die assembly comprises an upper die mounting seat and an upper die plate; the upper die mounting seat is mounted on the lower die mounting seat, the upper die plate is mounted on the upper die mounting seat, and the upper die core is mounted on the upper die plate; The upper ejection mechanism is installed on the lower mold mounting seat, and the upper ejection mechanism includes a plurality of ejector rods penetrating the lower mold core and an upper ejection driving mechanism, and the upper ejection driving mechanism is used to drive the ejector rods to move up and down relative to the lower mold core in the height direction. When the upper ejection driving mechanism drives the ejector rods to move upward, the ejector rods drive the solid copper substrate to move upward, so that the solid copper substrate squeezes part of the semi-solid aluminum alloy liquid in the first space into the second space; The upper surface of the lower mold core is formed with a recessed portion, the bottom surface of the upper mold core is extended downward to form a raised portion, and the upper mold core is provided with a plurality of needle-column-shaped through holes arranged at intervals at positions corresponding to the raised portions; the first space is formed by enclosing the raised portion and the recessed portion, and the second space is formed by a plurality of needle-column-shaped through holes respectively connected to the first space; The pressing mechanism includes a plurality of ejector pins penetrating the upper mold core and a pressing drive mechanism, wherein the plurality of ejector pins are connected in a one-to-one correspondence with the plurality of needle-column-shaped through holes, and the pressing drive mechanism is used to drive the ejector pins to move up and down in the height direction relative to the upper mold core, so that the ejector pins move up and down in the needle-column-shaped through holes, so as to adjust the height of the semi-solid aluminum alloy liquid in the second space and seal the upper end of the needle-column-shaped through holes; The ejector pin and the needle-shaped through hole form an exhaust gap, and the diameter of the exhaust gap is 3-6 microns; Before step S40, the bidirectional extrusion molding step, an exhaust step is also included: the solid copper substrate is driven to move upward to the first position by an upper push mechanism, so that the first part of the semi-solid aluminum alloy liquid in the first space is squeezed into the second space, and the air in the first space is discharged outward from the exhaust gap; wherein the pressure applied by the upper push mechanism is less than 5 tons, the pressure application time is 0.1-0.5 seconds, and the height of the semi-solid aluminum alloy liquid entering the second space is less than 5% of the height of the aluminum needle column; In step S40, the bidirectional extrusion molding step, the solid copper substrate is driven to move upward to the second position by the upper push mechanism, so that the solid copper substrate squeezes the second part of the semi-solid aluminum alloy liquid in the first space into the second space; wherein the upper push mechanism applies a pressure of 400-500 tons, the pressure application time is 60-180 seconds, and the total height of the first part of the semi-solid aluminum alloy liquid and the second part of the semi-solid aluminum alloy liquid entering the second space is the preset height of the aluminum needle column; The copper-aluminum composite pin-type row-shaped component comprises a base plate, which comprises a copper base plate and an aluminum base plate metallurgically bonded to the surface of the copper base plate; a plurality of aluminum pin columns arranged at intervals are formed on the aluminum base plate.

2. The method for forming the copper-aluminum composite pin-shaped row member according to claim 1, characterized in that: In step S40, the bidirectional extrusion molding step, a heating step is also included: heating the workpiece to be formed by heat conduction through a heating component; wherein the heating component is embedded in the upper mold core and / or the lower mold core, and the heating component is used to heat the upper mold core and / or the lower mold core.

3. The forming method of the copper-aluminum composite pin-shaped row member according to claim 2, characterized in that: In step S40, the bidirectional extrusion molding step, it also includes: obtaining the temperature of the semi-solid aluminum alloy liquid in the first space through a temperature sensor, and when the temperature of the semi-solid aluminum alloy liquid is lower than a preset temperature value, controlling the heating component to heat the upper mold core and / or the lower mold core; wherein the temperature sensor is embedded in the upper mold core and / or the lower mold core, and the temperature sensor is used to detect the temperature in the mold cavity.

4. The method for forming the copper-aluminum composite pin-shaped row member according to claim 2, characterized in that: In step S40, the bidirectional extrusion molding step, it also includes: obtaining the flow pressure of the semi-solid aluminum alloy liquid in the first space through a pressure sensor, and when the flow pressure of the semi-solid aluminum alloy liquid is less than a preset pressure value, controlling the upper push mechanism and / or the lower pressure mechanism to increase the applied pressure; wherein the pressure sensor is embedded in the upper mold core and / or the lower mold core, and the pressure sensor is used to detect the flow pressure of the semi-solid aluminum alloy liquid in the mold cavity.

5. The forming method of the copper-aluminum composite pin-shaped row member according to claim 1, characterized in that: A plurality of dovetail grooves distributed at intervals are formed on the upper surface of the copper substrate.

6. The forming method of the copper-aluminum composite pin-shaped row member according to claim 1, characterized in that: The upper ejection driving mechanism includes an upper ejection electric cylinder, a first lifting plate connected to the output shaft of the upper ejection electric cylinder, and a first locking block. A plurality of ejector rods are inserted into a preset mounting hole on the first lifting plate. The lower end of the ejector rod is provided with a limiting flange placed under the first lifting plate and abutting against the first lifting plate. The first locking block is fixed to the first lifting plate by a first bolt and cooperates with the first lifting plate to clamp and fix the limiting flange. The upper ejection electric cylinder drives the first lifting plate to move upward in the height direction. The first lifting plate drives the ejector rod to move upward in the height direction relative to the lower mold core. The ejector rod drives the solid copper base plate to move upward, so that the solid copper base plate squeezes part of the semi-solid aluminum alloy liquid in the first space into the second space.

7. The forming method of the copper-aluminum composite pin-shaped row member according to claim 1, characterized in that: The downward pressure driving mechanism includes a downward pressure electric cylinder, a second lifting plate connected to the output shaft of the downward pressure electric cylinder, and a second locking block. A plurality of ejectors are inserted into preset mounting holes on the second lifting plate. The upper ends of the ejectors are provided with a limiting flange which is placed under the second lifting plate and abuts against the second lifting plate. The second locking block is fixed to the second lifting plate by a second bolt and cooperates with the second lifting plate to clamp and fix the limiting flange.

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