A vibration friction welding control method capable of multi-layer welding

Abstract

The application provides a vibration friction welding control method for multilayer welding, based on the coupling control of depth and time, after the vibration welding process, the control system is fed back with the measurement of the welding time and the welding depth of the welded product, when the welding time is satisfied, the welding must be stopped after the depth reaches the set value, the thickness of the multilayer product in the welding process can be accurately controlled, the welding accuracy is ensured, and the multilayer welding requirement is satisfied; when the multilayer product is welded, the bottom die support mechanism moves the already welded multilayer structure semi-finished product downward by a layer structure distance after the welding of the last layer structure is completed, so that the multilayer structure semi-finished product and the new layer structure to be welded are welded at a specific depth, and the coupling control of the depth and the time of the application can satisfy the requirement of accurately controlling the multilayer welding.

Description

Technical Field

[0001] This invention relates to the field of plastic profile welding technology, and specifically to a vibration friction welding control method for 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, not two-layer or higher products. Correspondingly, existing welding equipment is limited to depth or time modes, has a simple welding mold structure, and suffers from low frequency and high amplitude, easily generating debris. This invention addresses the need for multi-layer product welding. During vibration friction welding, two components rub against each other under specific pressure, amplitude, and frequency, generating heat that melts the material at the weld interface. Specifically, under pressure, the molten material from the single-layer product flows out of the weld area, forming overflow. After vibration stops, the molten layer solidifies, creating a strong joint. Due to the special process of vibration friction welding, the melting and solidification of the contact surfaces after welding creates a welded effect. This results in changes in the thickness of the welded products. For two-layer or higher products, the cumulative effect of these changes in thickness across each layer leads to a larger overall product thickness tolerance, affecting not only the final product's height accuracy but also interfering with pressure control and the welding process itself.

[0004] Based on this, this application studies a vibration friction welding control method that can eliminate the above-mentioned problems and is suitable for multi-layer welding. The welding control method is based on depth and time coupling control. It must meet the following conditions: the depth reaches the set value, the time reaches the minimum set value, the vibration stops, and the product solidifies. At this time, the thickness of multi-layer products can be precisely controlled during the welding process to ensure welding accuracy and meet the requirements of multi-layer welding. Summary of the Invention

[0005] This invention provides a vibration friction welding control method for multi-layer welding, the welding control method specifically including the following steps: S1. Start the vibration friction welding equipment. The lifting platform rises. The control system of the vibration friction welding equipment automatically collects the welding working point and the coordinates of the product to be welded, and determines whether the welding conditions are met. S2. The control system performs welding after determining that the welding conditions are met. The control system controls the time and depth of the welding process. Welding stops when the welding time and welding depth meet the conditions. S3. The product enters the curing process, the lifting platform descends, and S1-S3 are cycled in sequence and the multi-layer structure is welded. S4. After the multi-layer structure welding is completed, the lifting platform descends and removes the welded product. The soundproof door opens, and the welding is complete.

[0006] Furthermore, in step S1, when the control system determines that the welding conditions are not met, the control system connects to the alarm module and resets the lifting platform of the vibration friction welding equipment.

[0007] Furthermore, the control system in step S2 controls the depth and time of the welding process. Specifically, the control system controls the welding depth. When the welding depth meets the requirements, the control system measures whether the welding time has reached the set value. When the welding depth reaches the set value and the time reaches the minimum set value, the welding is judged to be completed, and the vibration friction welding process is stopped.

[0008] Furthermore, in step S2, the control system controls the vibration drive structure to perform welding. The vibration drive structure includes four electromagnetic coils arranged on both sides. Two electromagnetic coils on the same side and 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.

[0009] Furthermore, the control system alternately energizes the electromagnetic coil to drive the vibration drive structure to move the upper mold frame, thereby moving the upper mold cavity and the upper structure to be welded relative to the lower structure to be welded, in order to perform welding.

[0010] Furthermore, in step S2, if the welding time does not reach the set value after the welding depth is satisfied, the control system will activate the alarm module, reset the lifting platform of the vibration friction welding equipment, re-collect the welding working point and the coordinates of the product to be welded, and determine whether the welding conditions are met.

[0011] Furthermore, in step S2, when an unexpected situation occurs that causes the welding time to not meet the conditions, the control system directly activates the alarm module, resets the lifting platform of the vibration friction welding equipment, re-collects the welding working point and the coordinates of the product to be welded, and determines whether the welding conditions are met.

[0012] Furthermore, the lifting platform in step S1 rises, including the lifting platform moving upward through the platform lifting structure, the platform lifting structure supporting the entire platform to rise, and causing the upper mold cavity and the lower mold cavity to reach the mold closing pressure.

[0013] Furthermore, in step S3, the lifting platform descends, including the following steps: (1) The lifting platform moves downward back to its original position through the platform lifting structure, the platform lifting structure lowers the entire support platform and moves the lower model cavity away from the upper model cavity; (2) The bottom mold support mechanism of the lifting platform drives the lower model cavity to move downward by the thickness of the upper structure to be welded, and then cycles through S1-S3 in sequence and welds the multi-layer structure.

[0014] Furthermore, in step S4, the lifting platform descends, including the lifting platform moving downwards back to its original position via the platform lifting structure. The platform lifting structure supports the entire platform in descending and moves the lower model cavity away from the upper model cavity.

[0015] Furthermore, when the bottom mold support mechanism is about to weld the next upper structure after the welding between the upper structures is completed, the lower mold cavity structure can be raised or lowered, and the lowering height is equal to the thickness of the upper structure to be welded.

[0016] Furthermore, in step S2, when the control system determines that the welding depth and / or time conditions are not met, the control system connects the alarm module and resets the lifting platform of the vibration friction welding equipment.

[0017] The beneficial effects of this invention are: (1) The vibration friction welding control method for multi-layer welding of the present invention is based on the coupling control of depth and time. After the vibration welding process in step S2, the welding depth and time of the product being welded will be measured and fed back to the control system. When the welding depth and time meet the conditions, the welding will stop. Since the welding time and welding depth are mutually influential, the control system controls the welding depth. When the welding depth meets the requirements, the system compensates for the time. When the time reaches the minimum value, the vibration stops and the product is solidified. At this time, the thickness of the multi-layer product during the welding process can be precisely controlled to ensure the welding accuracy and meet the requirements of multi-layer welding. (2) When welding multi-layer products, after the bottom mold support mechanism has finished welding between the upper layer structures, it is about to weld the next upper layer structure. The lower mold cavity structure can be raised and lowered. At this time, the already welded multi-layer semi-finished product can be moved down one layer distance to ensure that the product can achieve a specific depth of welding cooperation with the lower multi-layer semi-finished product and the new upper layer structure. With the depth and time coupling control of the present invention, the needs of precise control of multi-layer welding can be met. Attached Figure Description

[0018] Figure 1 This is an overall diagram of the vibration friction welding equipment; Figure 2 A partial magnification of the vibration friction welding equipment Figure 1 ; Figure 3 A partial magnification of the vibration friction welding equipment Figure 2 ; Figure 4 A partial magnification of the vibration friction welding equipment Figure 3 ; Figure 5 This is a schematic diagram of the lead screw and nut structure; Figure 6 This is a flowchart of the vibration friction welding control method. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] like Figure 1-6 As shown, this embodiment provides a vibration friction welding control method for multi-layer welding, the welding method specifically including the following steps: S1. Start the vibration friction welding equipment, put the first layer of the lower structure 504 to be welded from top to bottom into the lower mold cavity 102, and put the first layer of the upper structure 503 to be welded into it. The lifting platform 2 rises so that the upper mold cavity 502 and the upper structure 503 to be welded are relatively matched. The control system of the vibration friction welding equipment automatically collects the welding working point and the coordinates of the product to be welded, and determines whether the welding conditions are met. It should be noted that this step is a preparation for welding the first set of lower structure 504 and upper structure 503 to be welded. The first upper structure 503 to be welded in this step is also the second lower structure 504 to be welded in the second set 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 set of structures to be welded.

[0022] S2. The control system performs welding after determining that the welding conditions are met. The control system controls the depth and time of the welding process. Welding stops when the welding depth and welding time meet the conditions. S3. The product enters the curing process, thus completing the welding of the first and second layers; the lifting platform 2 descends. S4. The lifting platform 2 moves down to its original position and places the second layer of upper structure 503 to be welded. S1-S3 are repeated in sequence until the welding of the multi-layer structure is completed. S5. After the multi-layer structure welding is completed, the lifting platform 2 descends and removes the welded product. The soundproof door opens, and the welding is completed.

[0023] The vibration friction welding control method for multi-layer welding of the present invention is based on the coupled control of depth and time. After the vibration welding process in step S2, the welding time and welding depth of the product being welded are measured and fed back to the control system. The control system determines that the welding conditions are met and then performs welding. The control system controls the depth and time of the welding process. Welding stops when the welding depth and welding time meet the conditions. It is worth noting that in the welding control process of the present invention, since welding time and welding depth are mutually influential and correlated, the control system controls the welding depth. When the welding depth meets the set value, time compensation is used. When the time reaches the minimum value, vibration stops and the product solidifies. At this time, the thickness of multi-layer products can be precisely controlled during the welding process, ensuring welding accuracy and meeting the requirements of multi-layer welding.

[0024] It is worth noting that in step S1 above, when it is determined that the welding conditions are not met, the control system connects to the alarm module and resets the lifting platform 2 of the vibration friction welding equipment. Furthermore, in step S2 of this embodiment, when the control system determines that the welding depth and / or time conditions are not met, the control system connects to the alarm module and resets the lifting platform 2 of the vibration friction welding equipment.

[0025] Preferably, the control system in step S2 controls the depth and time of the welding process, specifically by controlling the welding depth. When the welding depth meets the requirements, the control system measures whether the welding time has reached the set value. Through welding time compensation, when the time reaches the minimum set value and the welding depth reaches the set value, the welding is judged to be completed, and the vibration friction welding process is stopped.

[0026] Meanwhile, in order to enable the control system to better and more accurately control the vibration friction welding process, a vibration drive structure 1210 is provided inside the drive housing 1200. The vibration drive structure 1210 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 1210 can drive the upper mold mechanism 5 to move left and right. The control system drives the upper mold frame 501 to move left and right relative to the lower structure 504 to perform welding by alternately energizing the electromagnetic coils.

[0027] To meet the above-mentioned control of the welding process, the upper mold mechanism 5 in 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 fixedly disposed within the upper mold cavity 502, and 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 mold cavity 503 to be welded left and right to weld the product. Furthermore, a platform fixture 1 is provided below the upper mold mechanism 5. 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, a lower mold cavity 102, and a middle mold cavity 103. The lifting platform 2 is located below the lower mold frame 101, and the lifting of the entire 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 structure 504 to be welded on 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 structure 503 to be welded corresponds to the lower structure 504 to be welded, thereby performing vibration friction welding.

[0028] In this embodiment, the vibration friction welding control method of the present invention, which enables multi-layer welding, is based on the coupled control of depth and time. Since welding time and welding depth are mutually influential and correlated, the control system controls the welding time. That is, in step S2, when the welding depth meets the set value, if the welding time does not reach the set value, the control system activates the alarm module, resets the lifting platform 2 of the vibration friction welding equipment, re-collects the welding working point and the coordinates of the product to be welded, and determines whether the welding conditions are met.

[0029] It is understandable that in step S2, when an unexpected situation occurs that causes the welding time to not meet the conditions, the control system directly activates the alarm module, resets the lifting platform 2 of the vibration friction welding equipment, re-collects the welding working point and the coordinates of the product to be welded, and determines whether the welding conditions are met.

[0030] 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) and the lifting mechanism of the welding lower mold structure (i.e., the bottom mold support mechanism) 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.

[0031] 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.

[0032] 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.

[0033] Based on the above structure, in the welding method of this application, the lifting platform 2 rises in step S1, including the lifting platform 2 moving upward through the platform lifting structure 202. The platform lifting structure 202 raises the entire support platform 2022 and makes the upper mold cavity 502 and the lower mold cavity 102 reach the mold closing pressure.

[0034] In step S3, the lifting platform 2 descends, including the lifting platform 2 moving downwards back to its original position via the platform lifting structure 202. The platform lifting structure 202 lowers the entire supporting platform 2022 and moves the lower mold cavity 102 away from the upper mold cavity 502. The lifting platform 2 also moves its bottom mold support mechanism 201. The bottom mold support mechanism 201 drives the lower mold cavity 102 to move downwards by the thickness of the upper structure 503 to be welded. Then, S1-S3 are repeated sequentially to weld the multi-layer structure.

[0035] In step S4, the lifting platform 2 descends, including the lifting platform 2 moving downwards back to its original position via the platform lifting structure 202. The platform lifting structure 202 supports the overall descent of the platform 2022 and moves the lower model cavity 102 away from the upper model cavity 502.

[0036] In this embodiment, when welding multi-layer products, after the bottom mold support mechanism 201 has completed welding between the upper layers of the structure, it is about to weld the next upper layer structure 503. At this time, the lower mold cavity 102 structure can be raised or lowered. This allows the already welded multi-layer semi-finished product to move down one layer of the structure, ensuring that the product can achieve a specific depth of welding fit with the lower multi-layer semi-finished product and the new upper layer structure 503 during welding, thus meeting the requirements of multi-layer welding.

[0037] 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 control method for multi-layer welding, characterized in that, The welding control method specifically includes the following steps: S1. Start the vibration friction welding equipment. The lifting platform rises. The control system of the vibration friction welding equipment automatically collects the welding working point and the coordinates of the product to be welded, and determines whether the welding conditions are met. S2. After the control system determines that the welding conditions are met, welding is performed. The control system controls the welding depth. When the welding depth meets the requirements, the control system measures whether the welding time has reached the set value. When the welding depth reaches the set value and the time reaches the minimum set value, the welding is determined to be completed, and the vibration friction welding process is stopped. S3. The product enters the curing process, the lifting platform descends, and S1-S3 are cycled in sequence and the multi-layer structure is welded. S4. After the multi-layer structure welding is completed, the lifting platform descends and removes the welded product. The soundproof door opens, and the welding is complete. The lifting platform in step S1 rises, including the lifting platform moving upward through the platform lifting structure. The platform lifting structure supports the entire platform to rise and makes the upper mold cavity and the lower mold cavity reach the mold closing pressure. In step S3, the lifting platform descends, including the following steps: (1) 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; (2) The bottom mold support mechanism of the lifting platform drives the lower model cavity to move downward by the thickness of the upper structure to be welded, and then cycles through S1-S3 in sequence and welds multiple layers of structure. In step S2, when the control system determines that the welding depth and / or time conditions are not met, the control system connects the alarm module and resets the lifting platform of the vibration friction welding equipment. In step S2, the control system controls the vibration drive structure to perform welding. The vibration drive structure 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. The control system alternately energizes the electromagnetic coil, causing the vibration drive structure to drive the upper mold frame, which in turn moves the upper mold cavity and the upper structure to be welded relative to the lower structure to be welded, to perform welding.

2. The vibration friction welding control method for multi-layer welding according to claim 1, characterized in that, In step S1, when the control system determines that the welding conditions are not met, the control system connects to the alarm module and resets the lifting platform of the vibration friction welding equipment.

3. The vibration friction welding control method for multi-layer welding according to claim 1, characterized in that, In step S2, if the welding time does not reach the set value after the welding depth is satisfied, the control system will activate the alarm module, reset the lifting platform of the vibration friction welding equipment, re-collect the welding working point and the coordinates of the product to be welded, and determine whether the welding conditions are met.

4. The vibration friction welding control method for multi-layer welding according to claim 3, characterized in that, In step S2, when an unexpected situation occurs that causes the welding time to not meet the conditions, the control system directly activates the alarm module, resets the lifting platform of the vibration friction welding equipment, re-collects the welding working point and the coordinates of the product to be welded, and determines whether the welding conditions are met.

5. The vibration friction welding control method for multi-layer welding according to claim 1, characterized in that, In step S4, the lifting platform descends, including the lifting platform moving downwards back to its original position via the platform lifting structure. The platform lifting structure supports the entire platform as it descends, and moves the lower model cavity away from the upper model cavity.

6. The vibration friction welding control method for multi-layer welding according to claim 1, characterized in that, When the bottom mold support mechanism is about to weld the next upper layer structure after the welding between the upper layers is completed, the lower mold cavity structure is raised and lowered by a height equal to the thickness of the upper layer structure to be welded.

Images