A vibration friction welding apparatus and welding method capable of multi-layer welding

Abstract

The application provides a multi-layer weldable vibration friction welding device, an upper die mechanism comprises an upper die frame and an upper die cavity arranged in the upper die frame, an upper layer structure to be welded is fixedly arranged in the upper die cavity, the upper die frame is fixedly connected with a vibration driving structure, and the upper die frame, the upper die cavity and the upper layer structure to be welded can be driven to move left and right to weld a product through the vibration driving structure; when a lower die cavity structure is lifted after welding of an upper layer structure between the last layer structure is completed and a next layer welding upper layer structure to be welded is required, a multi-layer structure semi-finished product which has been welded can be moved downward by a distance of one layer structure, so that the multi-layer structure semi-finished product and the new layer welding upper layer structure can be welded at a specific depth, welding precision is improved, and the multi-layer welding requirement can be met.

Description

Technical Field

[0001] This invention relates to the field of plastic profile welding technology, specifically to a vibration friction welding device and welding method capable of multi-layer welding. Background Technology

[0002] Traditional methods for joining plastic parts include screw connections, snap fasteners, press fittings, adhesive bonding, and welding. Among existing technologies, welding is one of the most effective methods for permanently joining plastic parts. There are various welding processes for plastics, including ultrasonic welding, vibration friction welding, rotary friction welding, hot gas welding, laser welding, and infrared welding. Vibration friction welding is particularly suitable for welding seams on a large flat surface and for welding compatible thermoplastic materials. Vibration friction can achieve high pressure resistance, high sealing, and high strength welding, and it is a very precise and continuous welding process.

[0003] However, existing welding equipment can generally only weld single-layer products and cannot weld products with two or more layers. Correspondingly, existing welding equipment can only use depth mode or time mode for welding. The structure of the product welding mold is simple. In addition, existing welding equipment has low frequency and high amplitude, and the welded products are prone to generating debris. This invention meets the needs of welding multi-layer products.

[0004] Based on this, this application studies an ultra-high frequency vibration friction welding device that can eliminate the above-mentioned problems. It has a high frequency and low amplitude, and does not produce debris after welding. At the same time, this application also designs a four-sided slider mechanism and a slider side locking mechanism to clamp and fix the welded product, ensuring convenient product loading and unloading and that the slider position is fixed during welding. The application also sets up a lifting mechanism for the movable platform and a lifting mechanism for the intermediate support platform to meet the requirements of multi-layer welding. Furthermore, it proposes a structure-based welding method that uses a depth-time coupled control method to ensure that the depth reaches the set value, the time reaches the minimum set value, the vibration stops, and the product solidifies, thus meeting the requirements of multi-layer welding. Summary of the Invention

[0005] This invention provides a vibration friction welding device capable of multi-layer welding.

[0006] The device includes a sheet metal outer cover and a main frame disposed within the sheet metal outer cover. The main frame is fixedly equipped with a platform fixture for vibration friction welding and an upper mold mechanism. The main frame includes an installation frame and a drive housing disposed above the installation frame. The vibration friction welding platform fixture is disposed within the installation frame, and the upper mold mechanism is disposed below the drive housing.

[0007] The upper mold mechanism includes an upper mold frame and an upper mold cavity disposed within the upper mold frame. The upper mold cavity contains a fixed upper structure to be welded. The upper mold frame is fixedly connected to a vibration drive structure. The vibration drive structure can drive the upper mold frame to move the upper mold cavity and the upper structure to be welded left and right to weld the product.

[0008] Furthermore, the vibration friction welding equipment also includes a main frame disposed within the sheet metal outer cover and an electrical cabinet disposed on one side of the main frame. The electrical cabinet includes an electrical box, a circuit breaker, and an air purifier. The electrical box is fixedly disposed within the electrical cabinet by a shock-absorbing structure.

[0009] Furthermore, a vibration driving structure is provided inside the drive housing. The vibration driving structure includes four electromagnetic coils arranged on both sides. The two electromagnetic coils arranged on the same side and the two electromagnetic coils arranged on the other side are alternately energized. At this time, the vibration driving structure can drive the upper mold mechanism to move left and right.

[0010] Furthermore, a platform fixture is provided below the upper mold mechanism. The platform fixture includes a welded lower mold structure, a lifting platform, and a locking mechanism. The welded lower mold structure includes a lower mold frame, a lower mold cavity, and a middle mold cavity.

[0011] Furthermore, the lifting platform is located below the lower mold frame, and the lifting and lowering of the welding lower mold structure can be controlled by the lifting platform. The locking mechanism is located above the lower mold frame, and the lower structure to be welded on the welding lower mold structure can be locked and fixed by the locking mechanism.

[0012] Furthermore, the upper model cavity and the lower model cavity are correspondingly arranged so that the upper structure to be welded corresponds to the lower structure to be welded.

[0013] Furthermore, a honeycomb-shaped support component is also provided inside the drive housing. The honeycomb-shaped support component is located above the upper mold frame and applies initial pressure to the upper mold cavity and the upper structure to be welded.

[0014] Furthermore, the lower mold base includes a lower mold base plate, and the locking mechanism is disposed on the lower mold base plate. The locking mechanism includes a side locking mechanism and a four-sided slider mechanism. The four-sided slider mechanism is disposed around the lower mold cavity and can protrude from the boundary of the lower mold cavity to move and confine the product within the lower mold cavity.

[0015] Furthermore, the four-sided slider mechanism includes an upper slider, a lower slider, a left slider, and a right slider, which are arranged around the lower model cavity. The upper slider, lower slider, left slider, and right slider are each driven by a linear motor to move.

[0016] Furthermore, the side locking mechanism has multiple components, which are respectively disposed on the left and right sliders, so as to facilitate the side locking mechanism to lock the slider in the vibration direction.

[0017] Furthermore, the lifting platform includes a two-stage lifting structure: a bottom formwork support mechanism and a platform lifting structure.

[0018] Furthermore, the platform lifting structure includes toothed chains disposed on the left and right sides of the lifting platform and a support platform fixedly disposed on the toothed chains. The toothed chains are driven by a servo motor to move, so that the support platform moves up and down.

[0019] Furthermore, the lifting platform, through the cooperation of the bottom formwork support mechanism and the lifting mechanism of the platform lifting structure, lifts and lowers the entire support platform when the platform lifting structure is working.

[0020] Furthermore, the bottom mold support mechanism includes a drive motor and a lead screw connected to the drive motor. A nut is fitted on the lead screw and moves up and down. The nut is fixedly mounted on the lower mold cavity, driving the lower mold cavity to move up and down.

[0021] Furthermore, a slide rail is provided on the bottom frame of the main frame, and the platform tooling can move along the slide rail inside the main frame.

[0022] Furthermore, the mounting frame is also equipped with a translation drag chain.

[0023] A welding method for multi-layer welding, using the aforementioned vibration friction welding equipment for multi-layer welding, specifically includes the following steps:

[0024] S1. Place the first layer of the lower structure to be welded from bottom to top into the lower model cavity, and then place the first layer of the upper structure to be welded into it. The four-sided slider mechanism clamps the lower structure to be welded, and the side locking mechanism locks the slider.

[0025] S2. The lifting platform moves upward, fixing the upper mold cavity relative to the upper structure to be welded, and bringing the upper and lower mold cavities to the set mold closing pressure value and starting welding; the vibration drive structure drives the upper mold frame to move the upper mold cavity and the upper structure to be welded relative to the lower structure to be welded to perform welding.

[0026] S3. After the welding reaches the set welding depth and welding time, the vibration-driven structure stops moving and waits for the upper and lower structures to be welded to solidify and cool; thus completing the welding of the first and second layers.

[0027] S4. The lifting platform moves down to its original position and places the second layer of upper structure to be welded. The four-sided slider mechanism clamps the second layer of lower structure to be welded, and the side locking mechanism locks the slider.

[0028] S5. Repeat S2-S4 sequentially until the welding of the multi-layer structure is completed;

[0029] S6. The side locking mechanism cancels the locking slider, the four-sided slider mechanism opens, and the bottom mold support mechanism moves upward to the part removal position to remove the welded finished product.

[0030] Furthermore, in step S2, the lifting platform moves upward through the platform lifting structure, which supports the entire platform to rise and causes the upper and lower mold cavities to reach the mold closing pressure.

[0031] Furthermore, in step S4, the lifting platform moves downward back to its original position through the platform lifting structure. The platform lifting structure supports the entire platform to descend and moves the lower model cavity away from the upper model cavity.

[0032] Furthermore, after the lifting platform moves downward to its original position in step S4, the process also includes a bottom mold support mechanism movement step. The bottom mold support mechanism drives the lower mold cavity to move downward by the thickness of the upper structure to be welded, and then repeats steps S2-S4 in sequence to weld the multi-layer structure.

[0033] The beneficial effects of this invention are:

[0034] (1) The vibration friction welding equipment of the present invention can realize multi-layer welding. The lifting platform and the lower mold cavity on the welding lower mold structure are driven to lift and lower through the cooperation of the bottom mold support mechanism and the platform lifting structure. When welding multi-layer products, the lifting platform rises under the drive of the platform lifting structure and generates mold closing pressure between it and the upper mold mechanism. After the mold closing pressure reaches the set value, welding is started. The four-sided slider mechanism and the slider side locking mechanism are set together. The four-sided slider mechanism clamps and fixes the product to be welded on the welding lower mold structure, ensuring that the product is easy to pick up and put down and the slider position is fixed during welding. The slider side locking mechanism locks in the left and right vibration directions to prevent the horizontal vibration direction of each layer of product from being misaligned due to vibration during the multi-layer welding process when the vibration friction welding equipment is working.

[0035] (2) When welding multi-layer products, the bottom mold support mechanism can lift the lower mold cavity structure after the bottom mold support mechanism has finished welding between the upper layer structures and is about to weld the next upper layer structure. At this time, the already welded multi-layer structure semi-finished product can be moved down one layer structure distance to ensure that the product can achieve a specific depth of welding cooperation with the lower multi-layer structure semi-finished product and the new upper layer structure during welding. This not only improves the welding accuracy but also meets the multi-layer welding requirements. Attached Figure Description

[0036] Figure 1 This is an overall diagram of a vibration friction welding equipment capable of multi-layer welding;

[0037] Figure 2 This is a diagram showing the process after removing the sheet metal casing and electrical cabinet from a vibration friction welding machine capable of multi-layer welding. Figure 1 ;

[0038] Figure 3 This is a diagram showing the process after removing the sheet metal casing and electrical cabinet from a vibration friction welding machine capable of multi-layer welding. Figure 2 ;

[0039] Figure 4 This is a magnified view of a portion of the platform tooling;

[0040] Figure 5 A partial enlargement of a vibration friction welding device capable of multi-layer welding. Figure 1 ;

[0041] Figure 6 A partial enlargement of a vibration friction welding device capable of multi-layer welding. Figure 2 ;

[0042] Figure 7 A partial enlargement of a vibration friction welding device capable of multi-layer welding. Figure 3 ;

[0043] Figure 8 This is a flowchart of the welding method;

[0044] Figure 9 This is a schematic diagram of the internal structure of the drive housing;

[0045] Figure 10 This is a schematic diagram of the lead screw and nut structure. Detailed Implementation

[0046] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0047] It should be noted that the terms "upper," "lower," "inner," "outer," and "middle," etc., used in the specification, claims, and accompanying drawings of this invention indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances. In addition, the term "multiple" should mean two or more.

[0048] like Figure 1-10 As shown, this embodiment provides a vibration friction welding device capable of multi-layer welding, including a sheet metal outer cover 100, a main frame 1000 disposed within the sheet metal outer cover 100, and an electrical cabinet 2000 disposed on one side of the main frame 1000. The electrical cabinet 2000 includes an electrical box, a circuit breaker, and an air purifier 2100. The electrical box is fixedly disposed within the electrical cabinet 2000 by a shock-absorbing structure.

[0049] It is worth noting that the main frame 1000 of this embodiment has a platform fixture 1 for vibration friction welding and an upper mold mechanism 5 fixedly installed inside it. The main frame 1000 includes a mounting frame 1100 and a drive housing 1200 disposed above the mounting frame 1100. The vibration friction welding platform fixture 1 is disposed inside the mounting frame 1100, and the upper mold mechanism 5 is disposed below the drive housing 1200.

[0050] The drive housing 1200 is provided with a vibration drive structure 1210. The vibration drive structure 1210 includes four electromagnetic coils arranged on both sides. The two electromagnetic coils arranged on the same side and the two electromagnetic coils arranged on the other side are alternately energized. At this time, the vibration drive structure 1210 can drive the upper mold mechanism 5 to move left and right.

[0051] The upper mold mechanism 5 of this embodiment includes an upper mold frame 501 and an upper mold cavity 502 disposed within the upper mold frame 501. The upper mold cavity 502 is used to fix the upper structure 503 to be welded during welding. The upper mold frame 501 is fixedly connected to the vibration drive structure 1210. The vibration drive structure 1210 can drive the upper mold frame 501 to move the upper mold cavity 502 and the upper structure 503 to be welded left and right to weld the product.

[0052] Below the upper mold mechanism 5, a platform fixture 1 is also provided. The platform fixture 1 includes a welding lower mold structure, a lifting platform 2, and a locking mechanism 3. The welding lower mold structure includes a lower mold frame 101 and a lower mold cavity 102. The lifting platform 2 is located below the lower mold frame 101, and the lifting and lowering of the welding lower mold structure can be controlled by the lifting platform 2. The locking mechanism 3 is located above the lower mold frame 101, and the lower layer structure 504 to be welded on the lower mold cavity 102 of the welding lower mold structure can be locked and fixed by the locking mechanism 3. Preferably, the upper mold cavity 502 and the lower mold cavity 102 are correspondingly arranged so that the upper layer structure 503 to be welded corresponds to the lower layer structure 504 to be welded, thereby performing vibration friction welding.

[0053] It should be noted that the upper structure 503 to be welded is fixed in the upper mold cavity 502 in such a way that the upper mold cavity 502 can limit the lateral movement of the upper structure 503 to be welded, that is, the upper structure 503 to be welded cannot move laterally in the four directions of up, down, left, and right relative to the upper mold cavity 502. Preferably, the shape and size of the upper mold cavity 502 match the shape and size of the upper structure 503 to be welded, so as to restrict the lateral degree of freedom of the upper structure 503 to be welded.

[0054] It is understood that the external shapes of the upper structure 503 and the lower structure 504 to be welded in the attached drawings are merely schematic and do not represent any limitation on the external shapes of the upper structure 503 and the lower structure 504 to be welded.

[0055] The bottom frame of the main frame 1000 is also provided with a slide rail, and the platform fixture 1 can move along the slide rail inside the main frame 1000. The mounting frame 1100 is also provided with a translation drag chain 1110 so that the upper model cavity 502 and the lower model cavity 102 can be correspondingly set by translating the platform fixture 1.

[0056] To ensure sufficient pressure is maintained during welding from bottom to top, this application also provides a honeycomb support component 1220 inside the drive housing 1200. The honeycomb support component 1220 is positioned above the upper mold frame 501 and applies initial pressure to the upper mold cavity 502 and the upper structure 503 to be welded, thereby ensuring the quality of the welded product.

[0057] Furthermore, the lower mold base 101 includes a lower mold base plate 104, and the locking mechanism 3 is disposed on the lower mold base plate 104. The locking mechanism 3 includes a side locking mechanism 301 and a four-sided slider mechanism 302. The four-sided slider mechanism 302 is disposed around the lower mold cavity 102 and can protrude from the boundary of the lower mold cavity 102 to move and confine the product within the lower mold cavity 102. Preferably, the four-sided slider mechanism 302 includes an upper slider 3021, a lower slider 3022, a left slider 3023, and a right slider 3024. Slider 3021, lower slider 3022, left slider 3023, and right slider 3024 are arranged around the lower model cavity 102. The upper slider 3021, lower slider 3022, left slider 3023, and right slider 3024 are driven by linear motors to move. The side locking mechanism 301 has multiple components and is respectively arranged on the left slider 3023 and right slider 3024 to facilitate locking the slider in the vibration direction and prevent the left slider 3023 and right slider 3024 from moving during equipment operation, causing product misalignment.

[0058] Furthermore, the side locking mechanism 301 includes a locking pin 3011 and a drive motor 3012. The left slider 3023 and the right slider 3024 are fixedly provided with buckles 3025 at positions corresponding to the side locking mechanism 301. The locking pin 3011 can extend and retract under the action of the drive motor 3012, so that the locking pin 3011 extends into the buckle 3025, locking the left slider 3023 and the right slider 3024 in the left and right vibration directions, preventing misalignment in the horizontal vibration direction between each layer of product during the multi-layer welding process caused by vibration when the vibration friction welding equipment is working.

[0059] Furthermore, the lifting platform 2 includes a two-stage lifting structure: a bottom mold support mechanism 201 and a platform lifting structure 202. The lifting mechanism of the movable platform, i.e., the platform lifting structure 202, and the lifting mechanism of the welding lower mold structure, i.e., the bottom mold support mechanism 201, cooperate to meet the multi-layer welding requirements of the platform tooling. The platform lifting structure 202 includes toothed chains 2021 arranged on the left and right sides of the lifting platform 2 and a support platform 2022 fixedly arranged on the toothed chains 2021. The toothed chains 2021 are driven by a servo motor to move, so that the support platform 2022 moves up and down.

[0060] In this embodiment, the lifting platform 2, through the cooperation of the bottom mold support mechanism 201 and the lifting mechanism of the platform lifting structure 202, lifts the entire support platform 2022 when the platform lifting structure 202 is working. This can drive the platform tooling 1 set on it to lift the entire platform, so that the welding lower mold structure and the upper mold mechanism set above it, which can vibrate left and right, can cooperate to realize the mold welding of multi-layer products.

[0061] Furthermore, the bottom mold support mechanism 201 includes a drive motor and a lead screw 2012 connected to the drive motor. A nut 2013 is fitted on the lead screw 2012 and moves up and down. The nut 2013 is fixedly mounted on the lower mold cavity 102 and drives the lower mold cavity 102 to move up and down.

[0062] Based on the above structure, this application also relates to a welding method capable of multi-layer welding, the welding method specifically including the following steps:

[0063] S1. Place the first layer of the lower structure 504 to be welded from bottom to top into the lower mold cavity 102, and place the first layer of the upper structure 503 to be welded into it. The four-sided slider mechanism 302 clamps the lower structure 504 to be welded, and the side locking mechanism 301 locks the slider.

[0064] It should be noted that this step is a preparation for welding the first group of lower structure 504 and upper structure 503 to be welded. The first upper structure 503 to be welded in this step S1 is also the second lower structure 504 to be welded in the second group of structures to be welded. And so on, the i-th upper structure 503 to be welded is also the (i+1)-th lower structure 504 to be welded in the next group of structures to be welded.

[0065] S2, the lifting platform 2 moves upward, so that the upper mold cavity 502 is relatively fixed with the upper structure 503 to be welded, and the upper mold cavity 502 and the lower mold cavity 102 reach the mold closing pressure setting value and start welding; the vibration drive structure 1210 drives the upper mold frame 501 to move the upper mold cavity 502 and the upper structure 503 to be welded relative to the lower structure 504 to be welded to perform welding.

[0066] S3. After the welding reaches the set welding depth and welding time, the vibration drive structure 1210 stops moving and waits for the upper structure 503 to be welded and the lower structure 504 to be welded to solidify and cool; thus completing the welding of the first layer and the second layer.

[0067] S4. The lifting platform 2 moves down to its original position and places the second layer upper structure 503 to be welded. The four-sided slider mechanism 302 clamps the second layer lower structure 504 to be welded, and the side locking mechanism 301 locks the slider.

[0068] S5. Repeat S2-S4 sequentially until the welding of the multi-layer structure is completed;

[0069] S6. The side locking mechanism 301 cancels the locking slider, the four-sided slider mechanism 302 opens, and the bottom mold support mechanism 201 moves upward to the part removal position to remove the welded finished product.

[0070] In step S2, the lifting platform 2 moves upward through the platform lifting structure 202, which supports the platform 2022 as a whole and makes the upper mold cavity 502 and the lower mold cavity 102 reach the mold closing pressure.

[0071] In step S4, the lifting platform 2 moves downward back to its original position through the platform lifting structure 202. The platform lifting structure 202 lowers the entire supporting platform 2022 and moves the lower model cavity 102 away from the upper model cavity 502.

[0072] After step S4, the lifting platform 2 moves downward and returns to its original position, the bottom mold support mechanism 201 moves. The bottom mold support mechanism 201 drives the lower mold cavity 102 to move downward by the thickness of the upper structure 503 to be welded, and then cycles through S2-S4 to weld the multi-layer structure.

[0073] In this embodiment, when welding multi-layer products, after the bottom mold support mechanism 201 has finished welding between the previous set of structures and is about to weld the next set of upper structure 503 to be welded, the lower mold cavity 102 structure can be raised or lowered. At this time, the already welded multi-layer semi-finished product can be moved down one layer of structure distance to ensure that the product can achieve a specific depth of welding fit with the lower multi-layer semi-finished product and the new upper structure 503 to be welded, which can meet the multi-layer welding requirements.

[0074] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A vibration friction welding device capable of multi-layer welding, comprising a sheet metal outer cover and a main frame disposed within the sheet metal outer cover, wherein a platform fixture for vibration friction welding and an upper mold mechanism are fixedly disposed inside the main frame, the main frame comprising an installation frame and a drive housing disposed above the installation frame, the platform fixture for vibration friction welding is disposed within the installation frame, and the upper mold mechanism is disposed below the drive housing. The upper mold mechanism includes an upper mold frame and an upper mold cavity disposed within the upper mold frame. The upper mold cavity contains a fixed upper structure to be welded. The upper mold frame is fixedly connected to a vibration drive structure. The vibration drive structure can drive the upper mold frame to move the upper mold cavity and the upper structure to be welded left and right to weld the product. A platform fixture is provided below the upper mold mechanism. The platform fixture includes a welded lower mold structure, a lifting platform, and a locking mechanism. The welded lower mold structure includes a lower mold frame, a lower mold cavity, and a middle mold cavity. The lifting platform is located below the lower mold frame, and the lifting and lowering of the welding lower mold structure can be controlled by the lifting platform. The locking mechanism is located above the lower mold frame, and the lower structure to be welded on the welding lower mold structure can be locked and fixed by the locking mechanism. The lower mold frame includes a lower mold base plate, and the locking mechanism is disposed on the lower mold base plate. The locking mechanism includes a side locking mechanism and a four-sided slider mechanism. The four-sided slider mechanism is disposed around the lower mold cavity and can protrude from the boundary of the lower mold cavity to move and confine the product within the lower mold cavity. The four-sided slider mechanism includes an upper slider, a lower slider, a left slider, and a right slider. The upper slider, lower slider, left slider, and right slider are arranged around the lower model cavity. The upper slider, lower slider, left slider, and right slider are each driven by a linear motor to move. The side locking mechanism has multiple components, which are respectively arranged on the left and right sliders to facilitate locking the slider in the vibration direction. The lifting platform includes a two-stage lifting structure: a bottom formwork support mechanism and a platform lifting structure. The platform lifting structure includes toothed chains arranged on the left and right sides of the lifting platform and a support platform fixedly arranged on the toothed chains. The toothed chains are driven by a servo motor to move, so that the support platform moves up and down. The lifting platform, through the cooperation of the bottom formwork support mechanism and the lifting mechanism of the platform lifting structure, lifts and lowers the entire support platform when the platform lifting structure is working.

2. The vibration friction welding equipment capable of multi-layer welding according to claim 1, characterized in that, The vibration friction welding equipment also includes a main frame housed inside the sheet metal enclosure and an electrical cabinet located on one side of the main frame. The electrical cabinet includes an electrical box, a circuit breaker, and an air purifier. The electrical box is fixedly installed inside the electrical cabinet by a shock-absorbing structure.

3. The vibration friction welding equipment capable of multi-layer welding according to claim 1, characterized in that, The drive housing is equipped with a vibration drive structure, which includes four electromagnetic coils arranged on both sides. The two electromagnetic coils on the same side and the two electromagnetic coils on the other side are alternately energized. At this time, the vibration drive structure can drive the upper mold mechanism to move left and right.

4. The vibration friction welding equipment capable of multi-layer welding according to claim 1, characterized in that, The upper mold cavity and the lower mold cavity are configured to correspond to each other, so that the upper structure to be welded corresponds to the lower structure to be welded.

5. The vibration friction welding equipment capable of multi-layer welding according to claim 1, characterized in that, A honeycomb-shaped support component is also provided inside the drive housing. The honeycomb-shaped support component is located above the upper mold frame and applies initial pressure to the upper mold cavity and the upper structure to be welded.

6. The vibration friction welding equipment capable of multi-layer welding according to claim 1, characterized in that, The bottom mold support mechanism includes a drive motor and a lead screw connected to the drive motor. A nut is fitted on the lead screw and moves up and down. The nut is fixed on the lower mold cavity and drives the lower mold cavity to move up and down.

7. The vibration friction welding equipment capable of multi-layer welding according to claim 1, characterized in that, The bottom frame of the main frame is also provided with a slide rail, and the platform tooling can move along the slide rail inside the main frame.

8. The vibration friction welding equipment capable of multi-layer welding according to claim 7, characterized in that, The mounting frame is also equipped with a translation drag chain.

9. A welding method for multi-layer welding, using the vibration friction welding equipment for multi-layer welding as described in any one of claims 1-8, characterized in that, The welding method specifically includes the following steps: S1. Place the first layer of the lower structure to be welded from bottom to top into the lower model cavity, and then place the first layer of the upper structure to be welded into it. The four-sided slider mechanism clamps the lower structure to be welded, and the side locking mechanism locks the slider. S2. The lifting platform moves upward, fixing the upper mold cavity relative to the upper structure to be welded, and bringing the upper and lower mold cavities to the set mold closing pressure value and starting welding; the vibration drive structure drives the upper mold frame to move the upper mold cavity and the upper structure to be welded relative to the lower structure to be welded to perform welding. S3. After the welding reaches the set welding depth and welding time, the vibration-driven structure stops moving and waits for the upper and lower structures to be welded to solidify and cool; thus completing the welding of the first and second layers. S4. The lifting platform moves down to its original position and places the second layer of the upper structure to be welded. The four-sided slider mechanism clamps the second layer of the lower structure to be welded, and the side locking mechanism locks the slider. S5. Repeat S2-S4 sequentially until the welding of the multi-layer structure is completed; S6. The side locking mechanism cancels the locking slider, the four-sided slider mechanism opens, and the bottom mold support mechanism moves upward to the part removal position to remove the welded finished product.

10. The welding method for multi-layer welding according to claim 9, characterized in that, In step S2, the lifting platform moves upward through the platform lifting structure, which supports the entire platform to rise and makes the upper mold cavity and lower mold cavity reach the mold closing pressure.

11. The welding method for multi-layer welding according to claim 10, characterized in that, In step S4, the lifting platform moves downward back to its original position through the platform lifting structure. The platform lifting structure supports the entire platform to descend and moves the lower model cavity away from the upper model cavity.

12. The welding method for multi-layer welding according to claim 11, characterized in that, After the lifting platform moves down to its original position in step S4, the bottom mold support mechanism also moves. The bottom mold support mechanism drives the lower mold cavity to move down by the thickness of the upper structure to be welded, and then steps S2-S4 are repeated in sequence to weld the multi-layer structure.

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