Fixture for diffusion welding of 6061 aluminum alloy disc body

Abstract

The utility model provides a clamp for diffusion welding of a 6061 aluminum alloy disc body. The clamp comprises a stainless steel limiting groove and a graphite pressing plate. The stainless steel limiting groove and the graphite pressing plate form a welding space used for containing the aluminum alloy disc body. The bottom of the graphite pressing plate is embedded into the stainless steel limiting groove, and the bottom face of the graphite pressing plate is located above the aluminum alloy disc body. The top of the graphite pressing plate protrudes out of the stainless steel limiting groove, and the top face makes contact with the bottom face of an upper pressing head of the pressing machine. The outer bottom face of the stainless steel limiting groove makes contact with the top face of a lower pressing head of the pressing machine. A first graphite paper layer is arranged on the inner side wall of the stainless steel limiting groove; a gap is formed between the first graphite paper layer and the side surface of the aluminum alloy disc body; the distance of the gap accounts for 0.5-1% of the diameter of the aluminum alloy disc body. According to the clamp, the overall deformation of the product can be small by controlling the deformation of the product in the horizontal direction, the diffusion welding effect of the product is guaranteed, and the machining difficulty and the risk of product scrapping are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding technical field, concretely relates to a kind of 6061 aluminum alloy disc body diffusion welding clamps. BACKGROUND

[0002] The structure of semiconductor components and backplanes is complex and diverse, so it is necessary to widely apply high-end clean welding technologies such as vacuum brazing and vacuum diffusion welding. Among them, vacuum diffusion welding mainly utilizes the heat conduction and diffusion effect between metal materials to realize the close combination of two or more metal materials at high temperature. In this process, due to the combined action of pressure and temperature, the product may be deformed, causing the risk of product scrap.

[0003] In the existing diffusion welding, a spacer is mainly arranged between the two pressure heads to limit the deformation of the product in the thickness direction, but it still cannot meet the requirement of limiting the small deformation amount of the product. In addition, although the strength of the spacer and other limiting materials is generally higher than that of the product, the thermal deformation is small, but if the temperature and pressure are too high, such as the spacer tends to horizontally deform the product at 500°C, and the product becomes soft after welding, the hardness decreases, and finally the position and size of the product change, increasing the processing difficulty and scrap rate. Moreover, the existing welding fixture is too heavy, the heating rate and cooling rate are very slow, which leads to a large temperature difference between the inside and outside of the product, further affecting the quality of the product.

[0004] Therefore, how to ensure the diffusion welding effect of the product while avoiding the deformation and movement of the product and ensuring the flatness and parallelism of the product is a technical problem to be solved in the field at present. SUMMARY

[0005] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a 6061 aluminum alloy disc body diffusion welding clamp, which can control the deformation amount of the product in the horizontal direction to make the overall deformation amount of the product small, ensure the diffusion welding effect of the product, have good flatness and parallelism, and reduce the processing difficulty and the risk of product scrap.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a kind of 6061 aluminum alloy disc body diffusion welding clamp, the clamp includes stainless steel limiting groove and graphite pressing plate;

[0008] The stainless steel limiting groove and graphite pressing plate constitute a welding space for accommodating the aluminum alloy disc body;

[0009] The bottom of the graphite pressing plate is embedded in the stainless steel limiting groove, and the bottom surface is above the aluminum alloy disc body;

[0010] The top of the graphite pressing plate protrudes from the stainless steel limiting groove and the top surface is in contact with the bottom surface of the upper pressing head of the pressing machine;

[0011] The outer bottom surface of the stainless steel limiting groove is in contact with the top surface of the lower pressing head of the pressing machine;

[0012] The inner side wall of the stainless steel limiting groove is provided with a first graphite paper layer;

[0013] The first graphite paper layer is provided with a gap between the side surface of the aluminum alloy disc body;

[0014] The distance of the gap accounts for 0.5-1% of the diameter of the aluminum alloy disc body.

[0015] In the clamp, the shape of the groove in the stainless steel limiting groove is generally matched with the shape of the aluminum alloy disc body, the shape of the aluminum alloy disc body is generally disc-shaped, when diffusion welding is carried out, the two aluminum alloy disc bodies to be welded are placed in the stainless steel limiting groove, and the graphite pressing plate is placed thereon, one side of the graphite pressing plate exerts pressure on the aluminum alloy disc body, and the other side is in contact with the upper pressing head, and the outer bottom surface of the stainless steel limiting groove is in contact with the lower pressing head. In the utility model, the upper pressing head and the lower pressing head of the pressing machine provide the pressure required for welding. In the utility model, the upper pressing head and the graphite pressing plate exert force on the product in a large area, avoiding stress concentration caused by the use of a cushion block in the existing process, and damage to the pressing head can be avoided.

[0016] The first graphite paper layer is provided on the inner side wall of the stainless steel limiting groove, which can utilize the high thermal conductivity of the graphite paper to achieve good heat transfer effect and prevent the product from being bonded to the clamp after welding. On this basis, the utility model controls the gap between the first graphite paper layer and the side surface of the aluminum alloy disc body within a specific range, which can reserve a certain horizontal deformation allowance for the product, achieve good welding effect, avoid excessive horizontal deformation, and keep the horizontal direction and thickness direction of the product within a small deformation amount under the limitation of the welding space, so as to control the overall deformation degree of the product, reduce the overall deformation amount of the product, and reduce the risk of product scrapping.

[0017] Preferably, the bottom surface of the graphite pressing plate is provided with a second graphite paper layer, and the bottom surface of the second graphite paper layer is in contact with the upper surface of the aluminum alloy disc body.

[0018] Preferably, the inner bottom surface of the stainless steel limiting groove is provided with a third graphite paper layer, and the top surface of the third graphite paper layer is in contact with the lower surface of the aluminum alloy disc body.

[0019] In the utility model, the first graphite paper layer and the second graphite paper layer can further prevent the product from being bonded to the clamp and ensure the yield of the product.

[0020] Preferably, the thickness of the graphite pressing plate in the stainless steel limiting groove is 16-20% of the depth of the stainless steel limiting groove, for example, it can be 16%, 17%, 18%, 19% or 20%, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0021] Preferably, the thickness of the graphite pressing plate protruding from the stainless steel limiting groove is 13-17% of the depth of the stainless steel limiting groove, for example, it can be 13%, 14%, 15%, 16% or 17%, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0022] In the utility model, by optimizing the thickness ratio of the graphite pressing plate in the stainless steel limiting groove and the thickness ratio of the graphite pressing plate protruding from the stainless steel limiting groove, the pressure applied by the pressing head can be further ensured to be transmitted to the graphite pressing plate and the product.

[0023] Preferably, the thickness of the first graphite paper layer is 0.1-3mm, for example, it can be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0024] Preferably, the thickness of the second graphite paper layer is 0.1-3mm, for example, it can be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0025] Preferably, the thickness of the third graphite paper layer is 0.1-3mm, for example, it can be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0026] Preferably, the inner bottom surface of the stainless steel limiting groove is circular.

[0027] Preferably, the diameter of the inner bottom surface of the stainless steel limiting groove is 353.7-363mm, for example, it can be 354mm, 355mm, 356mm, 357mm, 358mm, 360mm or 363mm, but is not limited to the listed values, and other values not listed in the value range are also applicable.

[0028] The operation process of the clamp for the diffusion welding of the 6061 aluminum alloy disc body is as follows:

[0029] Two parallel assembled aluminum alloy disc bodies are placed in a stainless steel limiting groove, and a graphite pressing plate is placed thereon, a first graphite paper layer is arranged between the inner side wall of the stainless steel limiting groove and the aluminum alloy disc body to prevent the product from adhering to the clamp, a second graphite paper layer on the bottom surface of the graphite pressing plate is in contact with the upper surface of the aluminum alloy disc body, a third graphite paper layer on the inner bottom surface of the stainless steel limiting groove is in contact with the lower surface of the aluminum alloy disc body, the upper pressing head of the pressing machine exerts force on the top surface of the graphite pressing plate, the lower pressing head of the pressing machine exerts force on the outer bottom surface of the stainless steel limiting groove, under the action of external pressure, the graphite pressing plate and the stainless steel limiting groove transmit the pressure to the aluminum alloy disc body through the graphite paper layer, and by controlling the gap between the first graphite paper layer and the side surface of the aluminum alloy disc body, the product reaches the welding effect while the deformation degree of the product is controlled.

[0030] Compared with the prior art, the utility model has the following beneficial effects:

[0031] The clamp can control the deformation amount of the product in the horizontal direction, so that the overall deformation amount of the product is small, the effect of diffusion welding of the product is guaranteed, the product has good flatness and parallelism, and the processing difficulty and the risk of product scrapping are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The longitudinal sectional view of the clamp provided by the utility model embodiment 1 is shown in the figure.

[0033] In the figure: 1 - stainless steel limiting groove; 2 - graphite pressing plate; 3 - aluminum alloy disc body; 4 - lower pressing head; 5 - upper pressing head; 6 - first graphite paper layer; 7 - second graphite paper layer; 8 - third graphite paper layer. DETAILED DESCRIPTION

[0034] It should be understood that, in the description of the utility model, the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0035] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] This embodiment provides a fixture for diffusion welding of a 6061 aluminum alloy disc, such as... Figure 1 As shown, the fixture includes a stainless steel limiting groove 1 and a graphite pressure plate 2. The stainless steel limiting groove 1 and the graphite pressure plate 2 form a welding space for accommodating the aluminum alloy disc 3. The bottom of the graphite pressure plate 2 is embedded in the stainless steel limiting groove 1, and its bottom surface is located above the aluminum alloy disc 3. The top of the graphite pressure plate 2 protrudes from the stainless steel limiting groove 1, and its top surface contacts the bottom surface of the upper pressure head 5 of the press. The outer bottom surface of the stainless steel limiting groove 1 contacts the top surface of the lower pressure head 4 of the press. A first graphite paper layer 6 is provided on the inner side wall of the stainless steel limiting groove 1. A gap is provided between the first graphite paper layer 6 and the side surface of the aluminum alloy disc 3, and the distance of the gap is 0.8% of the diameter of the aluminum alloy disc 3. A second graphite paper layer 7 is provided on the bottom surface of the graphite pressure plate 2, and the bottom surface of the second graphite paper layer 7 is in contact with the aluminum alloy disc. The upper surface of the stainless steel limiting groove 1 is in contact with the lower surface of the aluminum alloy disc 3. The bottom surface of the stainless steel limiting groove 1 is provided with a third graphite paper layer 8. The top surface of the third graphite paper layer 8 is in contact with the lower surface of the aluminum alloy disc 3. The depth of the stainless steel limiting groove 1 is 30mm. The thickness of the graphite pressure plate 2 inside the stainless steel limiting groove 1 is 5mm, accounting for 16.7% of the depth of the stainless steel limiting groove 1. The thickness of the graphite pressure plate 2 protruding from the stainless steel limiting groove 1 is 5mm, accounting for 16.7% of the depth of the stainless steel limiting groove 1. The thickness of the first graphite paper layer 6, the second graphite paper layer 7 and the third graphite paper layer 8 is 0.5mm. The bottom surface of the stainless steel limiting groove 1 is circular. The diameter of the bottom surface of the stainless steel limiting groove 1 is 356.6mm. The diameter of the aluminum alloy disc 3 is 350mm.

[0039] Example 2

[0040] The embodiment provides a clamp for diffusion welding of a 6061 aluminum alloy disc body, the clamp comprising a stainless steel limiting groove and a graphite pressing plate, the stainless steel limiting groove and the graphite pressing plate constituting a welding space for accommodating the aluminum alloy disc body, the bottom of the graphite pressing plate being embedded in the stainless steel limiting groove and the bottom surface being above the aluminum alloy disc body, the top of the graphite pressing plate being protruded from the stainless steel limiting groove and the top surface being in contact with the bottom surface of the upper pressing head of a pressing machine, the outer bottom surface of the stainless steel limiting groove being in contact with the top surface of the lower pressing head of the pressing machine, the inner side wall of the stainless steel limiting groove being provided with a first graphite paper layer, a gap being arranged between the first graphite paper layer and the side surface of the aluminum alloy disc body, the distance of the gap accounting for 0.5% of the diameter of the aluminum alloy disc body, the bottom surface of the graphite pressing plate being provided with a second graphite paper layer, the bottom surface of the second graphite paper layer being in contact with the upper surface of the aluminum alloy disc body, the inner bottom surface of the stainless steel limiting groove being provided with a third graphite paper layer, the top surface of the third graphite paper layer being in contact with the lower surface of the aluminum alloy disc body, the depth of the stainless steel limiting groove being 30 mm, the thickness of the graphite pressing plate in the stainless steel limiting groove being 6 mm, accounting for 20% of the depth of the stainless steel limiting groove, the thickness of the graphite pressing plate protruding from the stainless steel limiting groove being 4 mm, accounting for 13.3% of the depth of the stainless steel limiting groove, the thickness of the first graphite paper layer, the second graphite paper layer and the third graphite paper layer all being 0.1 mm, the inner bottom surface of the stainless steel limiting groove being circular, the diameter of the inner bottom surface of the stainless steel limiting groove being 353.7 mm, and the diameter of the aluminum alloy disc body being 350 mm.

[0041] Embodiment 3

[0042] The embodiment provides a clamp for diffusion welding of a 6061 aluminum alloy disc body, the clamp comprising a stainless steel limiting groove and a graphite pressing plate, the stainless steel limiting groove and the graphite pressing plate forming a welding space for accommodating the aluminum alloy disc body, the bottom of the graphite pressing plate being embedded in the stainless steel limiting groove and the bottom surface being above the aluminum alloy disc body, the top of the graphite pressing plate protruding from the stainless steel limiting groove and the top surface being in contact with the bottom surface of the upper pressing head of a pressing machine, the outer bottom surface of the stainless steel limiting groove being in contact with the top surface of the lower pressing head of the pressing machine, the inner side wall of the stainless steel limiting groove being provided with a first graphite paper layer, a gap being formed between the first graphite paper layer and the side surface of the aluminum alloy disc body, the distance of the gap accounting for 1% of the diameter of the aluminum alloy disc body, the bottom surface of the graphite pressing plate being provided with a second graphite paper layer, the bottom surface of the second graphite paper layer being in contact with the upper surface of the aluminum alloy disc body, the inner bottom surface of the stainless steel limiting groove being provided with a third graphite paper layer, the top surface of the third graphite paper layer being in contact with the lower surface of the aluminum alloy disc body, the depth of the stainless steel limiting groove being 30 mm, the thickness of the graphite pressing plate in the stainless steel limiting groove being 5.5 mm, accounting for 18.30% of the depth of the stainless steel limiting groove, the thickness of the graphite pressing plate protruding from the stainless steel limiting groove being 4.5 mm, accounting for 15% of the depth of the stainless steel limiting groove, the thicknesses of the first graphite paper layer, the second graphite paper layer and the third graphite paper layer all being 1 mm, the inner bottom surface of the stainless steel limiting groove being circular, the diameter of the inner bottom surface of the stainless steel limiting groove being 359 mm, and the diameter of the aluminum alloy disc body being 350 mm.

[0043] Comparative Example 1

[0044] The comparative example provides a clamp for diffusion welding of a 6061 aluminum alloy disc body, which is different from the embodiment 1 only in that the distance of the gap accounts for 0.1% of the diameter of the aluminum alloy disc body.

[0045] Comparative Example 2

[0046] The comparative example provides a clamp for diffusion welding of a 6061 aluminum alloy disc body, which is different from the embodiment 1 only in that the distance of the gap accounts for 2% of the diameter of the aluminum alloy disc body.

[0047] The clamp provided by the above embodiment and comparative examples is used for the operation process of diffusion welding of the 6061 aluminum alloy disc body as follows.

[0048] Two parallel assembled aluminum alloy disc bodies are placed in a stainless steel limiting groove, and a graphite pressing plate is placed on the aluminum alloy disc bodies, a first graphite paper layer is arranged between the inner side wall of the stainless steel limiting groove and the aluminum alloy disc body to prevent the product from adhering to the clamp, a second graphite paper layer on the bottom surface of the graphite pressing plate is in contact with the upper surface of the aluminum alloy disc body, a third graphite paper layer on the inner bottom surface of the stainless steel limiting groove is in contact with the lower surface of the aluminum alloy disc body, the upper pressing head of the pressing machine exerts force on the top surface of the graphite pressing plate, the lower pressing head of the pressing machine exerts force on the outer bottom surface of the stainless steel limiting groove, under the action of external pressure, the graphite pressing plate and the stainless steel limiting groove transmit the pressure to the aluminum alloy disc body through the graphite paper layer, and by controlling the gap between the first graphite paper layer and the side surface of the aluminum alloy disc body, the product reaches the welding effect while the deformation degree of the product is controlled.

[0049] The difference between Comparative Example 1-2 and Example 1 is only that the distance of the gap accounts for a percentage of the diameter of the aluminum alloy disc body is not within the range defined by the utility model, the distance of the gap in Comparative Example 1 is too small, which cannot guarantee that the aluminum alloy disc body has good welding strength and bonding rate in diffusion welding, and the distance of the gap in Comparative Example 2 is too large, which causes the aluminum alloy disc body to be excessively deformed, resulting in product scrap.

[0050] In summary, the clamp provided by the utility model can control the deformation amount of the product in the horizontal direction to make the overall deformation amount of the product small, guarantee the effect of diffusion welding of the product, make the product have good flatness and parallelism, and reduce the processing difficulty and the risk of product scrap.

[0051] The applicant declares that the above description is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, and the skilled person in the art should understand that any change or replacement that can be easily thought of by any person skilled in the art within the technical range disclosed by the utility model falls within the protection scope and disclosure range of the utility model.

Claims

1. A fixture for diffusion welding of a 6061 aluminum alloy disk body, characterized by, The clamp comprises a stainless steel limiting groove and a graphite pressing plate; The stainless steel limiting groove and the graphite pressing plate constitute a welding space for accommodating the aluminum alloy disc body; The bottom of the graphite pressing plate is embedded in the stainless steel limiting groove and the bottom surface is above the aluminum alloy disc body; The top of the graphite pressing plate protrudes from the stainless steel limiting groove and the top surface is in contact with the bottom surface of the upper pressing head of the pressing machine; The outer bottom surface of the stainless steel limiting groove is in contact with the top surface of the lower pressing head of the pressing machine; The inner side wall of the stainless steel limiting groove is provided with a first graphite paper layer; A gap is provided between the first graphite paper layer and the side surface of the aluminum alloy disc body; The distance of the gap accounts for 0.5-1% of the diameter of the aluminum alloy disc body.

2. The fixture for diffusion bonding of 6061 aluminum alloy disc bodies of claim 1, wherein The bottom surface of the graphite pressing plate is provided with a second graphite paper layer, and the bottom surface of the second graphite paper layer is in contact with the upper surface of the aluminum alloy disc body.

3. The fixture for diffusion bonding of 6061 aluminum alloy disc bodies of claim 1, wherein The inner bottom surface of the stainless steel limiting groove is provided with a third graphite paper layer, and the top surface of the third graphite paper layer is in contact with the lower surface of the aluminum alloy disc body.

4. The fixture for diffusion bonding of 6061 aluminum alloy disk bodies of claim 1, wherein The thickness of the graphite pressing plate in the stainless steel limiting groove accounts for 16-20% of the depth of the stainless steel limiting groove.

5. The fixture for diffusion bonding of 6061 aluminum alloy disk bodies of claim 1, wherein The thickness of the graphite pressing plate protruding from the stainless steel limiting groove accounts for 13-17% of the depth of the stainless steel limiting groove.

6. The fixture for diffusion bonding of 6061 aluminum alloy disk bodies of claim 1, wherein The thickness of the first graphite paper layer is 0.1-3mm.

7. The fixture for diffusion bonding of 6061 aluminum alloy disk bodies of claim 2, wherein The thickness of the second graphite paper layer is 0.1-3mm.

8. The fixture for diffusion bonding of 6061 aluminum alloy disk bodies of claim 3, wherein The thickness of the third graphite paper layer is 0.1-3mm.

9. The fixture for diffusion bonding of 6061 aluminum alloy disk bodies of claim 1, wherein The inner bottom surface of the stainless steel limiting groove is circular.

10. The fixture for diffusion bonding of 6061 aluminum alloy disk bodies of claim 9, wherein The diameter of the inner bottom surface of the stainless steel limiting groove is 353.7-363mm.

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