Machining method for assembling end cover and side shell

Abstract

The invention belongs to the field of part assembling and processing technologies, and discloses a processing method for assembling an end cover and a side shell, which comprises the following steps of: arranging a welding wire on the end cover, and acquiring an execution downward pressure F1 and an end downward pressure F2 of friction movement of the welding wire and the side shell; wherein the execution downforce F1 is greater than the final downforce F2; downwards pressing the end cover by adopting an execution downward pressure F1, and gradually adjusting the execution downward pressure F1 into a final downward pressure F2, so that the welding wire performs friction movement on the side shell by a first relative displacement h1; continuously pressing the end cover by adopting a final pressing force F2, simultaneously exciting the energy wave to continuously output a working energy J acting on the welding wire, stopping exciting the energy wave and pressing the end cover until the end cover moves for a second relative displacement h2 in the side shell again, and cooling and solidifying the end cover on the side shell; according to the scheme, the strength and stability of energy wave welding can be improved only through conventional physical means under the condition that an adhesion reagent is not added into the end cover and the side shell.

Description

Technical Field

[0001] This invention relates to the field of component assembly and processing technology, and in particular to a processing method for assembling an end cap and a side shell. Background Technology

[0002] In product processing, assembly line production is mainly divided into two types: assembly processing and one-piece molding processing. The choice is often based on factors such as product characteristics, processing difficulty, processing cost, and yield rate. Assembly processing involves assembling different parts into a finished product, which has advantages such as low processing difficulty and applicability to the production of most products. However, the assembly quality of local structures often affects the overall quality of the finished product. Therefore, it is necessary to control the quality of the assembly processing between different parts. For example, the partial sealing structure, which is widely used in products in various fields, is often assembled from a cylindrical part and an end cap. In specific assembly, the end cap is often installed at the port of the cylindrical part through methods such as adhesive bonding, interference fit, and threaded connection. Although the above installation methods have the advantages of quick installation and meeting basic connection strength requirements, the components are still relatively easy to separate or fall off under the influence of conventional external forces, and the fixing effect still needs to be improved. Summary of the Invention

[0003] The purpose of this invention is to provide a processing method for assembling end caps and side shells, so as to improve the connection strength and stability of energy wave welding by conventional physical means without adding adhesive reagents, thereby extending the product's service life.

[0004] The technical solution provided by this invention is a processing method for assembling end caps and side shells, comprising the following processing steps:

[0005] A welding line is provided on the outer peripheral surface of the end cap, and the execution pressure F1 and the final pressure F2 of the frictional movement between the welding line and the inner peripheral surface of the side shell are obtained; wherein, the execution pressure F1 is greater than the final pressure F2.

[0006] The end cap is pressed down with the applied pressure F1, and the applied pressure F1 is gradually adjusted to the final pressure F2, so that the welding wire moves rubbed on the inner circumferential surface of the side shell until a first relative displacement h1 is formed.

[0007] The end cap is pressed down using the final downward pressure F2, while the energy wave is continuously output to perform a work function J, so that the work function J acts on the welding wire until the end cap moves a second relative displacement h2 in the side shell. Then the energy wave is stopped and the pressing down of the end cap is stopped, and the end cap is allowed to cool and solidify on the side shell.

[0008] In the above-described processing method for assembling the end cap and the side shell, the welding wire includes a first welding wire and a second welding wire that both move friably against the inner circumferential surface of the side shell, and the first welding wire and the second welding wire are spaced apart along the axial direction of the end cap.

[0009] After the end cap cools and solidifies on the side shell, the second welding wire is fixedly connected to the inner side surface of the side shell, and the first welding wire is pressed against the inner side surface of the side shell.

[0010] In the above-mentioned processing method for assembling the end cap and the side shell, the inner circumferential surface of the side shell is provided with a concave part. When the welding wire moves within the stroke of the first relative displacement h1 and the second relative displacement h2, both the first welding wire and the second welding wire move rubbing against the concave part.

[0011] When the second welding wire is fixedly connected to the grooved portion, the second welding wire is fixedly connected to the grooved portion;

[0012] When the first weld wire is pressed against the inner side of the side shell, the first weld wire is pressed against the grooved portion.

[0013] In the above-described processing method for assembling the end cap and the side shell, before the simultaneous excitation of the energy wave and continuous output of the functional quantity J, a predetermined gap is formed between the outer peripheral surface of the second welding wire and the inner peripheral surface of the side shell.

[0014] In the above-described processing method for assembling the end cap and side shell, the outer peripheral surface of the second welding wire is an inclined surface, and the outer diameter of the second welding wire gradually increases from the side adjacent to the first welding wire to the side away from the first welding wire.

[0015] In the above-described processing method for assembling the end cap and side shell, before pressing the end cap down with the applied pressure F1, the method further includes:

[0016] Obtain the initial downward pressure F3 caused by frictional movement between the welding wire and the inner circumferential surface of the side shell, press down the end cap with the initial downward pressure F3, and gradually adjust the initial downward pressure F3 to the executed downward pressure F1; wherein, the initial downward pressure F3 is less than the executed downward pressure F1.

[0017] In the above-described processing method for assembling the end cap and side shell, the initial downward pressure F3 is:

[0018] F3≥4mg / (πD1 2 -πd1 2 );

[0019] Where D1 is the outer diameter of the first weld line, d1 is the inner diameter of the side shell in contact with the first weld line, ρ1 is the density of the end cap, ρ2 is the density of the side shell material, g is the gravitational acceleration, and m is the total weight of the end cap and the side shell.

[0020] The applied pressure F1 is:

[0021] F1≥F3+4mg / (πD2 2 -πd2 2 );

[0022] Where D2 is the outer diameter of the second weld wire, and d2 is the inner diameter of the side shell contacting the second weld wire;

[0023] The final downward pressure F2 is:

[0024] F2≥Sc·F1 / Sb

[0025] =πD2 2 [4mg / (πD1 2 -πd1 2 )+4mg / (πD2 2 -πd2 2 )] / (πD2 2

[0026] -πd2 2 );

[0027] Where Sb is the area of ​​the side shell subjected to the applied downward force F1, and Sc is the area of ​​the side shell subjected to the final downward force F2.

[0028] In the above-mentioned processing method for assembling the end cap and the side shell, when the initial downward pressure F3 is applied to press down the end cap, and the initial downward pressure F3 is gradually adjusted to the execution downward pressure F1, the end cap moves friably within the side shell, forming a third relative displacement h3.

[0029] The time corresponding to the third relative displacement h3 is the first time t1, and the ratio of the third relative displacement h3 to the first time t1 is as follows:

[0030]

[0031] The time corresponding to the first relative displacement h1 is the second time t2, and the ratio of the first relative displacement h1 to the second time t2 is as follows:

[0032]

[0033] Wherein, ρ1 is the density of the end cap.

[0034] In the above-described processing method for assembling the end cap and side shell, the ratio of the second relative displacement h2 to the functional quantity J is as follows:

[0035]

[0036] In the above-described processing method for assembling the end cap and side shell, the energy wave is ultrasonic, and the functional quantity J is:

[0037] J=ρ1fA 2 λ;

[0038] Where f is the ultrasonic frequency, A is the wave amplitude, and λ is the wavelength.

[0039] The beneficial effects of this invention after adopting the above technical solution are as follows:

[0040] In this technical solution, a welding wire is provided on the outer peripheral surface of the end cap. During the process of the end cap being pressed into the side shell, the welding wire replaces the outer peripheral surface of the end cap and directly rubs against the inner peripheral surface of the side shell. After hot melting and emulsification, it serves as the connection medium between the end cap and the side shell, improving the connection strength. Specifically, when the end cap is pressed down by the execution pressure F1, the end cap drives the welding wire to move rubbing against the inner peripheral surface of the side shell. The outer surface of the welding wire generates a small amount of emulsification through frictional heat generation and extrusion deformation, forming a hot melt adhesive layer that can detach from the outer surface of the welding wire. During the first relative displacement h1, the hot melt adhesive layer continuously diffuses as the welding wire moves. The local hot melt adhesive layer adheres to the inner wall of the shell in a combination of embedding and bonding. It should be noted that at this time, the outer surface of the welding wire and the side shell are... There are still gaps between the inner circumferential surfaces of the shell. Only when there are gaps between the outer circumferential surface of the welding wire and the inner circumferential surface of the side shell can the two slide relative to each other. At this time, the hot melt adhesive layer does not completely fill the gaps. The molten welding wire also has the function of reducing friction between the end cap and the side shell. Therefore, the applied pressure F1 is transformed into the final pressure F2 during this movement stroke to cooperate with the energy wave that subsequently acts on the welding wire. The energy wave causes the welding wire to melt and emulsify and fill the gaps through deformation. After solidification, the welding wire plays the role of connecting the side shell. Among them, the combination of the final pressure F2 and the energy of the energy wave can avoid the effect of overpressure on the hot melt emulsification effect of the welding wire and the bonding effect with the side shell. It also avoids damage to the end cap and side shell themselves and other components due to overpressure.

[0041] After the end cap completes the first relative displacement h1, the energy wave intervenes, and the end cap is simultaneously pressed down by the final downward pressure F2 until the second relative displacement h2 is completed, ensuring that the end cap can move into place within the side shell. During the movement of the end cap, the energy wave continuously outputs an energy J and acts on the bonding wire, causing emulsification inside the bonding wire, thereby turning the entire bonding wire into a molten state. This simulates the interaction relationship between monolayer and multilayer molecules in the BET theoretical model, i.e., the hot melt adhesive layer is equivalent to a monolayer molecule in the BET theoretical model, and the molten bonding wire is equivalent to a multilayer molecule in the BET theoretical model. The molten bonding wire, in the cold... The end cap and side shell are then bonded to the hot melt adhesive layer and the inner circumferential surface of the side shell. Compared to the weld line being completely bonded to the inner circumferential surface of the side shell, the connection strength of the end cap and side shell bonded in the above manner is significantly enhanced. This allows the end cap and side shell to improve the connection strength and stability of energy wave welding without adding adhesive reagents, using only conventional physical means, thereby enhancing impact resistance and extending the product's lifespan. In addition, compared to the connection method using adhesive reagents, the use of physical means that does not involve chemical auxiliaries is a green processing method, which is environmentally friendly. At the same time, it can also reduce production costs and improve production efficiency by reducing processing materials and processing steps. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the end cap and side shell assembly in the initial downward pressure F3 state according to Embodiment 1 of the present invention;

[0043] Figure 2 This is the invention Figure 1 A magnified view of a portion of A;

[0044] Figure 3 This is a schematic diagram of the end cap and side shell assembly in the initial downward pressure F1 state according to Embodiment 1 of the present invention;

[0045] Figure 4 This is the invention Figure 3 A magnified view of part B;

[0046] Figure 5 This is a schematic diagram of the end cap and side shell assembly in the initial downward pressure F2 state according to Embodiment 1 of the present invention;

[0047] Figure 6 This is the invention Figure 5 A magnified view of part C;

[0048] Figure 7 This is a schematic diagram of the end cap and side shell assembly in the end cap cooling and solidification state in Embodiment 1 of the present invention;

[0049] Figure 8 This is the invention Figure 7 A magnified view of part D;

[0050] Figure 9 This is a graph showing the processing method for assembling the end cap and side shell according to Embodiment 1 of the present invention;

[0051] Figure 10 This is a schematic diagram of one structure of the concave part in Embodiment 1 of the present invention;

[0052] Figure 11 This is the invention Figure 10 A magnified view of part E;

[0053] Figure 12 This is a schematic diagram of one structure of the concave part in Embodiment 1 of the present invention;

[0054] Figure 13 This is the invention Figure 11 A magnified view of part of F;

[0055] Figure 14 This is a schematic diagram of one structure of the concave part in Embodiment 1 of the present invention;

[0056] Figure 15 This is the invention Figure 14 A magnified view of a portion of G;

[0057] Figure 16 This is a schematic diagram of one structure of the concave part in Embodiment 1 of the present invention;

[0058] Figure 17 This is the invention Figure 16 A magnified view of H.

[0059] Reference numerals: 1. End cap; 11. Second weld wire; 12. First weld wire;

[0060] 2. Side shell; 21. Concave part; 22. Raised part. Detailed Implementation

[0061] The technical solution of the present invention will be further described in detail below with reference to specific embodiments, but this does not constitute any limitation on the present invention.

[0062] Example 1:

[0063] like Figure 1-9 As shown, the processing method for assembling the end cap and side shell includes the following processing steps:

[0064] A welding line is set on the outer peripheral surface of the end cap 1, and the execution pressure F1 and the final pressure F2 of the frictional movement between the welding line and the inner peripheral surface of the side shell 2 are obtained; wherein, the execution pressure F1 is greater than the final pressure F2.

[0065] The end cap 1 is pressed down by applying pressure F1, and the pressure F1 is gradually adjusted to the final pressure F2, so that the welding wire moves friably on the inner circumferential surface of the side shell 2 until the first relative displacement h1 is formed.

[0066] The end cap 1 is pressed down by the final downward pressure F2, while the energy wave is continuously output to generate a working quantity J, so that the working quantity J acts on the welding wire until the end cap 1 moves a second relative displacement h2 in the side shell 2. Then the energy wave is stopped and the pressing of the end cap 1 is stopped, and the end cap 1 is allowed to cool and solidify on the side shell 2.

[0067] The specific working principle is as follows: In this technical solution, a welding wire is provided on the outer circumferential surface of the end cap 1. During the process of the end cap 1 being pressed down into the side shell 2, the welding wire replaces the outer circumferential surface of the end cap 1 and directly rubs against the inner circumferential surface of the side shell 2. After hot melting and emulsification, it serves as the connection medium between the end cap 1 and the side shell 2, improving the connection strength. Specifically, combined with… Figure 3 and Figure 4 As shown, when end cap 1 is pressed down by the execution pressure F1, end cap 1 causes the welding wire to move friably on the inner circumferential surface of side shell 2. The outer surface of the welding wire generates a small amount of emulsification through frictional heat generation and extrusion deformation, forming a hot melt adhesive layer that can detach from the outer surface of the welding wire. During the first relative displacement h1, the hot melt adhesive layer continuously diffuses as the welding wire moves. The local hot melt adhesive layer adheres to the inner wall of the outer shell in a combination of embedding and bonding. It should be noted that at this time, there is still a gap between the outer surface of the welding wire and the inner circumferential surface of side shell 2. The existence of a gap between the outer circumferential surface of the welding wire and the inner circumferential surface of side shell 2 is necessary for relative sliding between the two. At this point, the hot melt adhesive layer has not completely filled the gap, and the molten welding wire still has the function of reducing friction between the end cap 1 and the side shell 2. Therefore, the applied pressure F1 is transformed into the final pressure F2 during this movement stroke to cooperate with the energy wave that subsequently acts on the welding wire. The energy wave causes the welding wire to melt and emulsify and fill the gap through deformation. After curing, the welding wire plays the role of connecting the side shell 2. The combination of the final pressure F2 and the energy of the energy wave can avoid the effect of overpressure on the hot melt emulsification effect of the welding wire and the bonding effect with the side shell 2. It also avoids damage to the end cap 1 and the side shell 2 themselves and other components due to overpressure.

[0068] Combination Figure 5 and Figure 6As shown, after the end cap 1 completes the first relative displacement h1, an energy wave intervenes, and the end cap 1 is simultaneously pressed down by a final downward pressure F2 until the second relative displacement h2 is completed, ensuring that the end cap 1 can move into place within the side shell 2. During the movement of the end cap 1, the energy wave continuously outputs a functional quantity J and acts on the welding wire, causing emulsification inside the welding wire, thereby turning the entire welding wire into a molten state. This simulates the interaction relationship between single-layer molecules and multi-layer molecules in the BET theoretical model, that is, the hot melt adhesive layer is equivalent to a single-layer molecule in the BET theoretical model, and the molten welding wire is equivalent to a multi-layer molecule in the BET theoretical model. After cooling, the end cap 1 and side shell 2 are bonded to the hot melt adhesive layer and the inner circumferential surface of the side shell 2. Compared with the welding line being completely bonded to the inner circumferential surface of the side shell 2, the connection strength of the end cap 1 and side shell 2 bonded in the above manner is significantly enhanced. This allows the end cap 1 and side shell 2 to improve the connection strength and stability of energy wave welding without adding adhesive reagents, using only conventional physical means, thereby enhancing impact resistance and extending the product's service life. In addition, compared with the connection method using adhesive reagents, the use of physical means that do not involve chemical auxiliaries is a green processing method, which is environmentally friendly. At the same time, it can also reduce production costs and improve production efficiency by reducing processing materials and processing steps.

[0069] This technical solution's connection method is applicable to end caps 1 and side shells 2 made of different materials. End caps 1 and side shells 2 can be made of any material such as metal, glass, ceramic, or plastic, or a combination of multiple materials. There is no limitation on the materials, nor is it necessary to use new or customized materials. The application threshold is low, resulting in advantages such as low processing difficulty, low processing cost, and good applicability. Regarding product appearance, this technical solution does not leave any processing marks on the product surface, ensuring that the product's surface design is not affected by processing. Therefore, there are no restrictions on the product's surface style. This connection method also allows for diverse designs on the product surface, meeting the different processing needs of various products and enhancing competitiveness in a broader and more demanding market. This technical solution abandons traditional adhesive or sealing methods, avoiding the use of adhesive reagents during installation. This reduces the environmental impact of processing and recycling, improving the product's environmental friendliness. It also eliminates the need for glue curing time, improving production efficiency and reducing production costs, shortening the product's production time, and avoiding the impact of adhesive reagent preparation difficulties and low yield rates on product processing.

[0070] Combination Figure 7 and Figure 8 As shown, in a further improvement, the welding wire includes a first welding wire 11 and a second welding wire 12 that both move in friction with the inner circumferential surface of the side shell 2. The first welding wire 11 and the second welding wire 12 are spaced apart along the axial direction of the end cover 1.

[0071] After the end cap 1 cools and solidifies on the side shell 2, the second welding wire 12 is fixedly connected to the inner side surface of the side shell 2, and the first welding wire 11 is pressed against the inner side surface of the side shell 2.

[0072] This embodiment uses two welding wires, namely the first welding wire 11 and the second welding wire 12. During the installation of the end cap 1, the first welding wire 11 first enters the side shell 2, and the second welding wire 12 then enters the side shell 2. When the end cap 1 and the side shell 2 are completely fixed relative to each other, the second welding wire 12 provides adhesive force to the side shell 2, and the first welding wire 11 provides frictional engagement force with the side shell 2 through interference fit or transition fit. Compared with only a single welding wire, two welding wires can avoid the treatment method of improving the connection effect by increasing the volume of the welding wire and strengthening the range and degree of hot melting emulsification of the welding wire. This stabilizes and improves the connection strength and reliability, thereby avoiding the impact of increasing the volume of the welding wire on the shape and size of the product. It also avoids the welding wire from overheating in order to enhance the connection effect, thus preventing damage to the end cap 1 and / or the side shell 2.

[0073] In practice, both the first bonding wire 11 and the second bonding wire 12 move rubbing against the inner wall of the side shell 2. Through frictional heat generation and extrusion deformation, both outer surfaces undergo micro-emulsification, forming a hot melt adhesive layer that can detach from the outer surfaces of both the first bonding wire 11 and the second bonding wire 12. This hot melt adhesive layer continuously spreads as the end cap 1 moves, with some areas adhering to the inner wall of the outer shell. When the energy wave intervenes, emulsification also occurs inside the second bonding wire 12, causing the entire second bonding wire 12 to melt, simulating the BET theory model. The interaction between single-layer and multi-layer molecules in the model allows the molten second welding line 12 to bond to the hot melt adhesive layer and the inner circumferential surface of the side shell 2. Compared to the second welding line 12 being completely bonded to the inner circumferential surface of the side shell 2, the connection strength of the above method is significantly improved. In addition, the molten second welding line 12 reduces friction between the end cap 1 and the outer shell, preventing the end cap 1 and the outer shell from squeezing each other due to excessive resistance, thereby preventing damage to the components caused by mutual squeezing. At the same time, it ensures that the end cap 1 can move into place within the side shell 2. The specific connection strength is shown in Table 1.

[0074] Table 1. Connection strength results of destructive testing in accordance with industry standard IEC 60947 (20 tests for each type)

[0075]

[0076]

[0077] It should be noted that the conventional connection method used in this test was ordinary ultrasonic welding; IP67 / 68 / 69K refer to the three waterproof levels of IP67, IP68, and IP69K, respectively. IP67: The product was immersed in water to a depth of 1 meter for 0.5 hours and then removed; the product functioned normally and was undamaged. IP68: The product was immersed in water to a depth of 1 meter for one week and then removed; the product functioned normally and was undamaged. IP69K: Pure water at a temperature of 80℃±5℃ and a water pressure of 8-10 Bar was used. The product was subjected to high-temperature water impacts from four directions (0°, 30°, 60°, and 90°) at a distance of 10cm to 15cm, each for 30 seconds. After the test, the product functioned normally and was undamaged.

[0078] According to the test results in Table 1, the connection strength of this embodiment is 2.5 times higher than that of conventional connection, which is a significant improvement. Furthermore, after the temperature change test, it will not separate due to the different shrinkage rates of the shells made of different materials, thus enhancing the structural strength and sealing performance of the product.

[0079] Another improvement of this embodiment is that the inner circumferential surface of the side shell 2 is provided with a concave portion 21. When the welding wire moves within the stroke of the first relative displacement h1 and the second relative displacement h2, the first welding wire 11 and the second welding wire 12 both move rubbing against the concave portion 21.

[0080] When the second welding wire 12 is fixedly connected to the grooved portion 21, the second welding wire 12 is fixedly connected to the grooved portion 21.

[0081] When the first welding line 11 presses against the inner side of the side shell 2, the first welding line 11 is pressed against the grooved part 21.

[0082] In practical applications, the concave portion 21 increases the roughness of the inner circumferential surface of the side shell 2, thereby increasing the porosity and microparticle size of the inner circumferential surface of the side shell 2 and thus increasing the specific surface area of ​​the inner circumferential surface of the side shell 2. In other words, within the same diameter range on the inner circumferential surface of the side shell 2, the relative contact area is increased. Due to the increase in the shell contact area, the connection area between the hot melt adhesive layer and the inner surface of the side shell 2, and between the molten second welding line 12 and the inner surface of the side shell 2, is indirectly increased. The bonding and adhesion between the inner surface of the side shell 2 and the welding line (specifically the second welding line 12) and the hot melt adhesive layer are enhanced, thereby improving the connection strength and stability between the end cap 1 and the side shell 2. The specific connection effect is shown in Table 2.

[0083] Among them, the porosity and micronization of the object's surface determine the size of the specific surface area. With other parameters remaining constant, the larger the proportion density of the concave part 21, the larger the specific surface area and the better the adhesion. Therefore, theoretically, there is no upper limit to the proportion density of the concave part 21, only a lower limit. Taking into account the influence of factors such as processing difficulty and cost, the minimum proportion density can generally be selected according to the actual use of the product.

[0084] like Figures 1-8 As shown, in this embodiment, the concave portion 21 is a helical toothed groove. The proportion density of the helical toothed groove on the inner circumferential surface of the side shell 2 is greater than or equal to 600ea / cm2. If the proportion density of the helical toothed groove decreases, it will lead to insufficient adhesion. If the proportion density of the helical toothed groove increases, it will lead to increased processing costs and may also easily cause damage to the inner surface, resulting in a decrease in adhesion. Therefore, the upper limit of the proportion density of the helical toothed groove on the inner circumferential surface of the side shell 2 can be selected according to the actual situation, but its lower limit is not lower than 600ea / cm2.

[0085] In practical applications, referring to the CNC thread model, ignoring surface roughness treatment values, the effective cross-sectional area of ​​the joint between the inner circumferential surface of the side shell 2 and the outer circumferential surface of the end cover 1 is set as S, the joint height as H, the pitch of the helical groove as p, the nominal diameter of the helical groove as d, and the formula 1-1 for the effective cross-sectional diameter e is:

[0086] de = d - 0.9382p (1-1)

[0087] Formula 1-2, which combines the effective cross-sectional diameter e with the effective cross-sectional area S, is as follows:

[0088] S=πde 2 / 4 (1-2)

[0089] Based on the effective cross-sectional area S, the formula 1-3 for the nominal diameter d of the helical groove is:

[0090]

[0091] Based on the nominal diameter d of the helical toothed groove, the formula 1-4 approximates the surface area N of one ring inside the side shell 2 as follows:

[0092]

[0093] Compared to the version without the added helical groove, the specific surface area increases by NH / P, which is the increase in the mating surface area between the inner circumferential surface of the side shell 2 and the outer circumferential surface of the end cap 1, as shown in Formula 1-5:

[0094]

[0095] Preferably, the groove depth of the spiral tooth groove is greater than or equal to 50 μm, the included angle between the inner surfaces of the opposite sides of the spiral tooth groove is 60°, and the root width of the spiral tooth groove is 25 μm.

[0096] Table 2. Connection strength results of destructive testing in accordance with industry standard IEC 60947 (20 tests for each type)

[0097]

[0098]

[0099] According to the test results in Table 2, the connection strength after adding the grooved part 21 in this embodiment is 6.25 times higher than that of the conventional connection, 4 times higher than that of the conventional connection with the same grooved part 21, and 2.5 times higher than that of the embodiment without the grooved part 21. The increase is relatively high, and the structural strength and sealing performance of the product are further enhanced.

[0100] As a further improvement of this embodiment, before the energy wave is continuously output to perform the functional quantity J, a set gap is formed between the outer peripheral surface of the second bonding wire 12 and the inner peripheral surface of the side shell 2.

[0101] Combination Figure 10 and Figure 11 As shown, in some embodiments, the concave portion 21 can be selected from spiral toothed grooves, or it can be selected from a number of spaced oblique grooves, or it can be selected from grooves arranged in a grid pattern.

[0102] like Figures 14-17 As shown, in some other embodiments, the grooved portion 21 can also be selected from multiple horizontally and vertically arranged grooves, wherein, combined with Figure 14 and Figure 15 As shown, the concave point can be a square hole, combined with... Figure 16 and Figure 17 As shown, it can also be a round hole or other blind holes. This embodiment does not impose too many restrictions on the specific structure of the concave point.

[0103] Combination Figure 12 and Figure 13 As shown, in some other embodiments, a raised textured part 22 is also provided on the basis of the concave textured part 21. The raised textured part 22 and the concave textured part 21 are combined together to increase the specific surface area on the inner circumferential surface of the side shell 2. For example, the concave textured part 21 adopts a number of spaced inclined grooves, and the raised textured part 22 adopts a number of spaced inclined strips. The inclined directions of the inclined grooves and the inclined strips are opposite to each other. The inclined strips are fixed on the inner circumferential surface of the side shell 2. The inclined grooves and the inclined strips intersect each other. Although this has certain processing difficulties and reduces production efficiency, it is better than the connection strength and effect of only having the concave textured part 21.

[0104] This embodiment artificially sets a predetermined gap between the outer peripheral surface of the end cap 1 and the inner peripheral surface of the side shell 2. This predetermined gap replaces the naturally occurring gap between the outer peripheral surface of the end cap 1 and the inner peripheral surface of the side shell 2. This allows the subsequent energy wave to provide the required energy based on the predetermined gap, rather than based on the gap with unknown parameters and uncontrollable spacing. This enables more precise control and provision of the energy required for the bonding wire, ensuring that the bonding wire (specifically the second bonding wire 12) is in a suitable or optimal thermal melting emulsification state. This avoids overheating or insufficient thermal melting emulsification of the bonding wire (specifically the second bonding wire 12), thus preventing a reduction in the final connection effect and quality.

[0105] like Figure 1 and Figure 2 As shown, in specific implementation operations, the outer peripheral surface of the second bonding wire 12 is an inclined surface, and the outer diameter of the second bonding wire 12 gradually increases from the side adjacent to the first bonding wire 11 to the side away from the first bonding wire 11.

[0106] In this embodiment, the inclined surface makes the thickness of the side of the second weld line 12 adjacent to the first weld line 11 smaller, and the thickness of the side of the second weld line 12 away from the first weld line 11 (i.e., the opposite side of the second weld line 12) larger. This physical structure makes the frictional resistance of the second weld line 12 entering the shell side from the outside of the side shell 2 smaller, reducing the required downward pressure and difficulty of entering, and at the same time, it plays a guiding and limiting role in the movement of the second weld line 12. During the frictional movement of the second weld line 12 and the inner circumferential surface of the side shell 2, the inclined surface uses a human-set inclined angle to cooperate with the inner circumferential surface of the side shell 2 to form a human-controlled set gap, replacing the naturally formed gap, thereby accurately controlling the working power of the energy wave output so that the outer circumferential surface of the second weld line 12 has a draft angle. That is, the inclined surface can also act as a draft surface in the injection molding process, which can quickly demold, avoid damage to the component structure, reduce the dimensional error and surface damage of the outer contour of the component, and reduce the risk of surface quality defects.

[0107] Another improvement to this embodiment, before applying downward pressure F1 to press down end cap 1, includes:

[0108] The initial downward pressure F3 is obtained to cause frictional movement between the welding wire and the inner circumferential surface of the side shell 2. The end cap 1 is pressed down with the initial downward pressure F3, and the initial downward pressure F3 is gradually adjusted to the executed downward pressure F1. The initial downward pressure F3 is less than the executed downward pressure F1.

[0109] The initial downward pressure F3 corresponds to the frictional resistance of the first weld wire 11 just entering the side shell 2 from the outside. At this time, the second weld wire 12 has not yet entered the side shell 2. The frictional resistance between the end cap 1 and the side shell 2 is generated by the friction between the first weld wire 11 and the inner circumferential surface of the side shell 2. Since the second weld wire 12 has not yet entered the side shell 2, the end cap 1 only needs to provide enough pressure to overcome the frictional resistance between the first weld wire 11 and the inner circumferential surface of the side shell 2 when it is first pressed down. As the second weld wire 12 enters the side shell 2 and moves along the inner circumferential surface of the side shell 2, the initial downward pressure F3 is gradually adjusted to the applied downward pressure F1 to ensure that the end cap 1...

[0110] The initial downward pressure F3 is set so that the end cap 1 is first pressed down by the initial downward pressure F3 before being pressed down by the applied downward pressure F1. Then, the pressure is gradually adjusted from the initial downward pressure F3 to the applied downward pressure F1. This avoids the processing defect of overpressure caused by directly using the applied downward pressure F3. This processing defect is because the press itself also has errors, and the downward pressure may be too high or too low. If the downward pressure is too high, it will cause a short operation response time and damage to parts. Conversely, if the downward pressure is too low, it will affect the connection strength and connection stability. By using the initial downward pressure F3 to press down first, the applied downward pressure F1 can be adjusted in real time based on actual observation information and theoretical analysis during the process of adjusting the initial downward pressure F3 to the applied downward pressure F1.

[0111] In practical implementation, the formulas 1-6 for the initial downward force F3 are as follows:

[0112] F3≥4mg / (πD1 2 -πd1 2 (1-6)

[0113] Where D1 is the outer diameter of the first welding line 11, d1 is the inner diameter of the side shell 2 in contact with the first welding line 11, ρ1 is the density of the end cap 1, ρ2 is the density of the side shell 2 material, g is the gravitational acceleration, and m is the total weight of the end cap 1 and the side shell 2.

[0114] In practical implementation, the formulas 1-7 for applying the downward pressure F1 are as follows:

[0115] F1≥F3+4mg / (πD2 2 -πd2 2 (1-7)

[0116] Wherein, D2 is the outer diameter of the second weld wire 12, and d2 is the inner diameter of the side shell 2 in contact with the second weld wire 12.

[0117] In practical implementation, the formulas 1-8 for the final downward pressure F2 are:

[0118] F2≥Sc·F1 / Sb

[0119] =πD2 2 [4mg / (πD1 2 -πd1 2 )+4mg / (πD2 2 -πd2 2 )] / (πD2 2 -πd2 2 (1-8)

[0120] Where Sb is the area of ​​the side shell subjected to the downward force F1, and Sc is the area of ​​the side shell subjected to the final downward force F2.

[0121] It should be noted that during the process of gradually adjusting the downward pressure F1 to the final downward pressure F2, the pressure and energy experienced by the side shell 2 remain consistent, i.e., F1·Sb=F2·Sc; where πD n 2 -πd n 2 It could represent either the gap area between end cap 1 and side shell 2, or the interference area between end cap 1 and side shell 2, depending on the stress stage of end cap 1 and side shell 2.

[0122] In this embodiment, the initial downward pressure F3, the executed downward pressure F1, and the final downward pressure F2 are all obtained by calculating the basic physical characteristic parameters of the end cap 1 and the side shell 2.

[0123] In practical applications, when the initial downward pressure F3 is applied to press down on the end cap 1, and the initial downward pressure F3 is gradually adjusted to the execution downward pressure F1, the end cap 1 moves friably within the side shell 2, forming a third relative displacement h3.

[0124] In the specific calculation, the time corresponding to the third relative displacement h3 is the first time t1, and the formula 1-9 is the relationship between the third relative displacement h3 and the first time t1:

[0125]

[0126] The specific derivation formula 1-10 for the ratio of the third relative displacement h3 to the first time t1 is as follows:

[0127]

[0128] Where v1 is the average velocity corresponding to the third relative displacement h3, and ΔF4 is the change in force within the third relative displacement h3.

[0129] In the specific calculation, the time corresponding to the first relative displacement h1 is the second time t2, and the formula 1-11 for the ratio of the first relative displacement h1 to the second time t2 is:

[0130]

[0131] Where ρ1 is the density of end cap 1.

[0132] Formula 1-12, which details the specific derivation of the ratio of the first relative displacement h1 to the second time t2, is as follows:

[0133]

[0134] Where v2 is the average velocity corresponding to the first relative displacement h1, and ΔF5 is the change in force within the first relative displacement h1.

[0135] In the specific calculation, the formula 1-13 for the ratio of the second relative displacement h2 to the work done J is:

[0136]

[0137] Formula 1-14 is the specific derivation formula for the relationship between the ratio of the second relative displacement h2 and the work done J:

[0138]

[0139] like Figure 9 As shown, in this embodiment, the third relative displacement h3, the first relative displacement h1, and the second relative displacement h2 correspond to the travel of the three regions from the initial downward pressure F3 to the executed downward pressure F1, from the executed downward pressure F1 to the final downward pressure F2, and from the final downward pressure F2 to the termination, respectively, serving as travel nodes for different downward pressures.

[0140] In this embodiment, the energy wave is ultrasound, so the formula 1-15 for the work quantity J is:

[0141] J=ρ1fA 2 λ (1-15)

[0142] Where f is the ultrasonic frequency, A is the wave amplitude, and λ is the wavelength.

[0143] The working quantity J of ultrasound, combined with the second relative displacement h2 mentioned above, is given by formula 1-16, which describes the ratio of the second relative displacement h2 to the working quantity J:

[0144]

[0145] In this embodiment, ultrasonic waves are preferred as the energy wave, which gives the processing and production of this embodiment the advantages of energy saving, no need for ventilation devices for smoke dissipation and heat dissipation, low cost, high efficiency and easy automation. In addition, infrared waves, laser waves and other energy transfer media can be used to replace ultrasonic waves. This embodiment does not impose too many restrictions on this.

[0146] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A processing method for assembling end caps and side shells, characterized in that, The processing steps include the following: A welding line is provided on the outer peripheral surface of the end cap, and the execution pressure F1 and the final pressure F2 of the frictional movement between the welding line and the inner peripheral surface of the side shell are obtained; wherein, the execution pressure F1 is greater than the final pressure F2. The end cap is pressed down with the applied pressure F1, and the applied pressure F1 is gradually adjusted to the final pressure F2, so that the welding wire moves rubbed on the inner circumferential surface of the side shell until a first relative displacement h1 is formed. The end cap is pressed down using the final downward pressure F2, while the energy wave is continuously output to perform a work function J, so that the work function J acts on the welding wire until the end cap moves a second relative displacement h2 in the side shell. Then the energy wave is stopped and the pressing down of the end cap is stopped, and the end cap is allowed to cool and solidify on the side shell.

2. The processing method for assembling the end cap and side shell according to claim 1, characterized in that, The welding wires include a first welding wire and a second welding wire that both move friably against the inner circumferential surface of the side shell, and the first welding wire and the second welding wire are spaced apart along the axial direction of the end cap. After the end cap cools and solidifies on the side shell, the second welding wire is fixedly connected to the inner side surface of the side shell, and the first welding wire is pressed against the inner side surface of the side shell.

3. The processing method for assembling the end cap and side shell according to claim 2, characterized in that, The inner circumferential surface of the side shell is provided with a concave part. When the welding wire moves within the stroke of the first relative displacement h1 and the second relative displacement h2, both the first welding wire and the second welding wire move rubbing against the concave part. When the second welding wire is fixedly connected to the grooved portion, the second welding wire is fixedly connected to the grooved portion; When the first weld wire is pressed against the inner side of the side shell, the first weld wire is pressed against the grooved portion.

4. The processing method for assembling the end cap and side shell according to claim 2, characterized in that, Before the simultaneous excitation of the energy wave to continuously output the functional quantity J, a predetermined gap is formed between the outer peripheral surface of the second bonding wire and the inner peripheral surface of the side shell.

5. The processing method for assembling the end cap and side shell according to claim 4, characterized in that, The outer peripheral surface of the second bonding wire is an inclined surface, and the outer diameter of the second bonding wire gradually increases from the side adjacent to the first bonding wire to the side away from the first bonding wire.

6. The processing method for assembling the end cap and side shell according to claim 2, characterized in that, Before pressing the end cap with the applied pressure F1, the method further includes: Obtain the initial downward pressure F3 caused by frictional movement between the welding wire and the inner circumferential surface of the side shell, press down the end cap with the initial downward pressure F3, and gradually adjust the initial downward pressure F3 to the executed downward pressure F1; wherein, the initial downward pressure F3 is less than the executed downward pressure F1.

7. The processing method for assembling the end cap and side shell according to claim 6, characterized in that, The initial downward pressure F3 is: F3≥4mg / (πD1 2 -πd1 2 ); Where D1 is the outer diameter of the first weld line, d1 is the inner diameter of the side shell in contact with the first weld line, ρ1 is the density of the end cap, ρ2 is the density of the side shell material, g is the gravitational acceleration, and m is the total weight of the end cap and the side shell. The applied pressure F1 is: F1≥F3+4mg / (πD2 2 -πd2 2 ); Where D2 is the outer diameter of the second weld wire, and d2 is the inner diameter of the side shell contacting the second weld wire; The final downward pressure F2 is: F2≥Sc·F1 / Sb =πD2 2 [4mg / (πD1 2 -πd1 2 )+4mg / (πD2 2 -πd2 2 )] / (πD2 2 -πd2 2 ); Where Sb is the area of ​​the side shell subjected to the applied downward force F1, and Sc is the area of ​​the side shell subjected to the final downward force F2.

8. The processing method for assembling the end cap and side shell according to claim 6, characterized in that, When the initial downward pressure F3 is applied to press down the end cap, and the initial downward pressure F3 is gradually adjusted to the execution downward pressure F1, the end cap moves frictionally within the side shell, forming a third relative displacement h3. The time corresponding to the third relative displacement h3 is the first time t1, and the ratio of the third relative displacement h3 to the first time t1 is as follows: The time corresponding to the first relative displacement h1 is the second time t2, and the ratio of the first relative displacement h1 to the second time t2 is as follows: Wherein, ρ1 is the density of the end cap.

9. The processing method for assembling the end cap and side shell according to claim 6, characterized in that, The ratio of the second relative displacement h2 to the work quantity J is as follows:

10. The processing method for assembling the end cap and side shell according to any one of claims 1-9, characterized in that, The energy wave is ultrasound, and the functional quantity J is: J=ρ1fA 2 l; Where f is the ultrasonic frequency, A is the wave amplitude, and λ is the wavelength.

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