Pump shell spot welding laser welding positioning tool and positioning method

Abstract

The invention provides a pump shell spot welding laser welding positioning tool and method, the tool comprises a profiling positioning body, a positioning pressing block and a pressing mechanism, the profiling positioning body is provided with a profiling positioning groove matched with the pump shell in shape, and the profiling positioning body and the positioning pressing block are matched to form a double-reference positioning structure; the pressing mechanism is a parallelogram elastic pressing device with a built-in spring, the assembly tolerance of + / -1.5 mm can be automatically compensated, and the repeated positioning precision of the tool reaches + / -0.1 mm. The profiling positioning body and the positioning pressing block are in modular design and are generally used for 114-328 series pump shells, and the model switching time is shorter than 5 minutes. The positioning method sequentially comprises the four stages of positioning, clamping, welding and discharging, the tool is matched with a 1500W optical fiber laser welding machine, and a workpiece rotating device can be selected to complete automatic ring welding. According to the method, the welding precision and efficiency are greatly improved, the skill dependence of operators is reduced, and the method has remarkable application and popularization value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of positioning tooling, in particular to a pump shell spot welding and laser welding positioning tooling and positioning method. BACKGROUND

[0002] In the assembly and manufacturing process of the pump body, the welding quality of the pump shell and the quick-mounting interface directly determines the sealing performance and running stability of the pump body. The traditional process adopts manual positioning, uses a simple clamp and a manual welding operation mode. The specific operation process is as follows: the operator first fixes the pump shell through a basic clamp such as a vice, then aligns the quick-mounting interface with the pump shell by visual observation and experience, and finally completes the welding operation by holding the welding gun around the workpiece. This process exposes many technical difficulties that are difficult to solve in actual production.

[0003] Manual alignment completely depends on the experience of the operator and cannot form a unified positioning reference, resulting in a common misalignment of 1-3mm between the pump shell and the quick-mounting interface. This misalignment directly causes uneven weld thickness, which not only affects the appearance of the pump body, but also weakens the smoothness of the fluid passage inside the pump body, reducing the working efficiency of the pump body. The manual welding method, speed and force have individual differences, and even the same operator cannot maintain consistent welding quality in different batches. Statistical data shows that the welding defect rate of the traditional process is high, and common defects include virtual welding, missed welding, porosity, etc. These defects can cause the pump body to leak under high pressure conditions, causing safety hazards and significantly increasing rework and after-sales costs. Single-piece welding takes 3-5 minutes, and the workpiece position needs to be adjusted frequently during the welding process, which cannot realize continuous operation. This efficiency level cannot meet the needs of large-scale production, restricting the improvement of enterprise productivity. High-quality welding operations must be completed by skilled welders with more than 3 years of experience, which has a long training period and high cost for new employees. At the same time, the labor cost of skilled welders is rising year by year, further compressing the profit space of enterprises.

[0004] Existing related technologies, such as the pump body welding positioning device disclosed in patent CN211414543U and the automatic welding equipment for a centrifugal pump shell disclosed in patent CN112548341A, have optimized the positioning structure or welding method to some extent, but still have obvious limitations. Some technologies only solve the positioning problem in a single dimension and lack tolerance compensation capability; some technologies have complex structures and take a long time to switch models, which cannot adapt to the production needs of multiple specifications of pump shells. Therefore, developing a pump shell spot welding and laser welding positioning tooling and positioning method that integrates high-precision positioning, self-adaptive tolerance compensation and rapid model switching has become a technical problem that needs to be solved in this field. SUMMARY

[0005] The present application provides a pump shell spot welding and laser welding positioning tooling and positioning method to solve the defects in the prior art.

[0006] The application provides a pump shell spot welding and laser welding positioning tool, which comprises: A profile positioning body, which is provided with a profile positioning groove matched with the outer shape of the pump shell, and is used for realizing contour positioning of the pump shell; A positioning pressing block, which is arranged on one side of the profile positioning body, and is used for realizing stop opening positioning of the quick mounting interface; the profile positioning body and the positioning pressing block cooperatively form a double-reference positioning structure; A pressing mechanism, which is connected with the positioning pressing block, and is a parallelogram elastic pressing device, and is internally provided with a spring, and is used for automatically compensating assembly tolerance and uniformly distributing pressing force.

[0007] According to the pump shell spot welding and laser welding positioning tool and the positioning method, the material of the profile positioning body is 6061 aluminum alloy.

[0008] According to the pump shell spot welding and laser welding positioning tool and the positioning method, the compensation amount of the spring is ±1.5 mm, and the repeat positioning accuracy of the tool is ±0.1 mm.

[0009] According to the pump shell spot welding and laser welding positioning tool and the positioning method, the tool is adapted to a 1500W fiber laser welding machine.

[0010] According to the pump shell spot welding and laser welding positioning tool and the positioning method, a workpiece rotating device can be selected and matched, which is connected with the profile positioning body, and is used for driving the pump shell to rotate to cooperate with the laser welding machine to complete girth welding.

[0011] According to the pump shell spot welding and laser welding positioning tool and the positioning method, the profile positioning body and the positioning pressing block are designed in a modularized mode to form a modularized positioning unit, which is used for realizing rapid change of the tool.

[0012] According to the pump shell spot welding and laser welding positioning tool and the positioning method, the modularized positioning unit is commonly used for spot welding positioning of the flange shell body of the 114-328 series pump shell.

[0013] The application provides a pump shell spot welding and laser welding positioning method, which comprises the following steps: S1, a positioning stage: placing the pump shell into a profile positioning groove of a profile positioning body to realize contour positioning of the pump shell; and placing a positioning pressing block in the pump shell to realize stop opening positioning; S2, a clamping stage: starting a cylinder of a laser welding machine to drive a pressing mechanism to press the positioning pressing block, and automatically compensating assembly tolerance through the elastic compensation function of the pressing mechanism; S3, a welding stage: starting the laser welding machine to automatically girth weld the butt joint of the pump shell and the quick mounting interface. S4, discharging stage: the cylinder is controlled to unlock the pressing mechanism, and the welded workpiece is taken out.

[0014] According to the pump shell spot welding laser welding positioning tool and positioning method provided by the application, in step S3, the selected workpiece rotating device is started to drive the pump shell to rotate, and the ring welding operation is completed in cooperation with the laser welding machine.

[0015] According to the pump shell spot welding laser welding positioning tool and positioning method provided by the application, when the pump shell model needs to be replaced, the modular positioning unit is replaced, and the model switching time is less than 5 minutes.

[0016] The pump shell spot welding laser welding positioning tool and positioning method provided by the application adopts a double-reference positioning structure combining the profile positioning of the profiling positioning body and the stop positioning of the positioning block, and establishes a unified and stable positioning reference. This structure completely eliminates the subjective error of manual alignment, so that the repeatability of the tool is ±0.1mm, and the interface docking misalignment is controlled within 0.1mm. High-precision positioning directly ensures the uniformity of the weld thickness, not only improves the sealing performance and running stability of the pump body, but also optimizes the fluid passage inside the pump body, so that the working efficiency of the pump body is improved. At the same time, the welding defect rate is reduced, and the rework and after-sales cost is greatly reduced. The pressing mechanism adopts a parallelogram elastic pressing device, and the compensation amount of the built-in spring can reach ±1.5mm. This design can automatically adapt to the size deviation of the pump shell and the quick-mounting interface caused by casting and machining, without manual adjustment. At the same time, the parallelogram structure can make the pressing force uniformly distributed on the workpiece contact surface, avoiding the local deformation problem of the workpiece caused by single-point pressing of the traditional clamp. This feature guarantees the geometric size precision of the pump shell, ensuring the smooth progress of the subsequent assembly process.

[0017] The profiling positioning body and the positioning pressing block adopt a modular design to form an independent modular positioning unit. The unit can be used for spot welding positioning of the flange shell of the pump shell of the 114-328 series. When the pump shell type needs to be replaced, only the corresponding modular positioning unit needs to be disassembled and replaced, without the need to adjust the overall structure of the tooling, and the type switching time is less than 5 minutes. The design makes a production line compatible with the production of pump shells of multiple specifications, greatly improving the flexibility of the production line and reducing the equipment investment cost of the enterprise. The tooling is adapted to a 1500W fiber laser welding machine, and automatic control of the welding process can be realized. At the same time, the tooling can be selected with a workpiece rotating device, which can drive the pump shell to rotate at a constant speed, and cooperate with the laser welding machine to complete automatic girth welding of 360° without dead angle. The automatic operation mode completely replaces manual girth welding, shortens the welding time of a single piece, and improves the production efficiency. In addition, automatic welding reduces manual intervention, further guarantees the consistency of the welding quality. The operation process of the tooling is simple and easy to understand, and ordinary operators can work after 1-2 hours of training, without relying on skilled welders. This feature greatly reduces the labor cost and new employee training cost of the enterprise, and also relieves the difficulty in recruiting skilled welders. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0019] Figure 1 FIG. 1 is a structure diagram of a profiling positioning body and a positioning pressing block of a laser welding positioning tooling provided by an embodiment of the present application; Figure 2 FIG. 2 is a whole structure diagram of the laser welding positioning tooling provided by the embodiment of the present application.

[0020] Reference signs: 1, profiling positioning body; 11, profiling positioning groove; 2, pump shell; 3, positioning pressing block; 4, pressing mechanism; 5, spring. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor fall within the scope of protection of the present application.

[0023] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] In the description of embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "in", "out", "up", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0025] The pump shell 2 spot welding laser welding positioning tool and positioning method provided in the embodiments of the present application are used to solve the problems of low positioning accuracy, slow clamping efficiency, poor model adaptability, etc. in the welding process of the pump shell 2 and the quick connector, are suitable for spot welding of the 114-328 series pump shell 2 flange shell, and are suitable for completing the automatic girth welding process by the 1500W fiber laser welding machine.

[0026] The profile positioning body 1 is made of 6061 aluminum alloy, which has the characteristics of lightweight, high strength and easy processing, can meet the high-precision positioning requirements, and can avoid the inconvenience caused by the excessive weight of the tool. According to the outer dimensions of the target pump shell 2, a profile positioning groove 11 is processed on the upper surface of the profile positioning body 1 by CNC precision machining. The inner wall profile of the profile positioning groove 11 is in 1:1 accurate matching with the outer wall profile of the pump shell 2, the gap is controlled within 0.05mm, and the profile positioning of the pump shell 2 after being put in is ensured to be completely matched, and the displacement and circumferential rotation of the pump shell 2 in the horizontal direction are limited. A mounting station is reserved on one side of the profile positioning body 1 for fixing the positioning block 3, the position accuracy of the mounting station is controlled within ±0.03mm, and the cooperativity of the subsequent double-reference positioning is guaranteed.

[0027] The positioning block 3 is made of high-strength alloy steel, and the end face is processed with a stop structure matched with the quick-mounting interface. The size accuracy of the stop structure is matched with the tolerance band of the quick-mounting interface, so that the quick-mounting interface can be accurately embedded and positioned. The positioning block 3 is connected with the mounting station of the profiling positioning body 1 through a sliding guide rail, and the guiding accuracy of the sliding guide rail is ±0.02 mm, so as to ensure the stability of the moving direction of the positioning block 3. The positioning block 3 cooperates with the profiling positioning body 1 to form a double-reference positioning structure, wherein the profiling positioning body 1 realizes the contour positioning of the pump shell 2, and the positioning block 3 realizes the stop positioning of the quick-mounting interface. The cooperation of the two can control the butt joint accuracy of the pump shell 2 and the quick-mounting interface within ±0.1 mm.

[0028] The pressing mechanism 4 adopts a parallelogram elastic pressing device, which is composed of a connecting rod, a spring 5, a pressing head and a cylinder connecting seat. The connecting rod adopts a hinge connection mode to form a parallelogram structure, so as to ensure that the pressing head always maintains a horizontal state during movement. The pressing mechanism 4 is internally provided with a compression spring 5, and the elastic coefficient of the spring 5 is accurately calculated. The compensation amount of the spring 5 is ±1.5 mm, which can automatically adapt to the size deviation of the pump shell 2 and the quick-mounting interface caused by casting and machining. One end of the pressing mechanism 4 is connected with the cylinder of the laser welding machine, and the other end is fixedly connected with the positioning block 3. When the cylinder drives the pressing mechanism 4 to act, the parallelogram structure can uniformly distribute the pressing force on the contact surface of the positioning block 3, so as to avoid the deformation of the workpiece caused by single-point force. The pressing mechanism 4 can be arranged on the same working platform with the profiling positioning body 1 through a support.

[0029] The tooling can be optionally provided with a workpiece rotating device, which is composed of a servo motor, a speed reducer and a rotating workbench. The rotating workbench is fixedly connected with the working platform at the bottom of the profiling positioning body 1, and the servo motor can drive the profiling positioning body 1 and the pump shell 2 to rotate at a speed of 0-60 r / min. The workpiece rotating device is linked with the control system of the laser welding machine, and when the welding program is started, the rotating device is started synchronously to drive the pump shell 2 to rotate, so that the welding gun of the laser welding machine can complete 360° circular welding work at a fixed position, thereby improving the uniformity and consistency of the weld.

[0030] The profiling positioning body 1 and the positioning block 3 adopt a modular design, and the two are connected to form an independent modular positioning unit through bolt fastening. Different models of pump shells 2 correspond to different specifications of modular positioning units, and the installation interface sizes of each unit are unified. When the model of the pump shell 2 needs to be replaced, the operator only needs to unscrew the fixing bolts, remove the current modular positioning unit, replace the unit of the corresponding model and re-tighten, so that the whole model switching process does not need to adjust other structures of the tooling, and the switching time is less than 5 minutes. The modular design makes the tooling applicable to the spot welding positioning of the flange shell of the 114-328 series pump shell 2.

[0031] The specific implementation steps of the positioning and welding method are as follows: The method for positioning welding of the pump shell 2 by using the above positioning and welding tooling includes the following specific steps: S1, in the positioning stage, the operator places the pump shell 2 to be welded into the profiling positioning groove 11 of the profiling positioning body 1 stably, so that the outer wall of the pump shell 2 completely matches the inner wall of the profiling positioning groove 11, the contour positioning of the pump shell 2 is realized, and the horizontal displacement and circumferential rotation of the pump shell 2 are limited. The quick connector is placed along the direction of the stop of the positioning block 3, so that the end face of the quick connector precisely matches the stop structure of the positioning block 3, the stop positioning of the quick connector is realized, and the vertical displacement of the quick connector is limited. At this time, the double-reference positioning structure composed of the profiling positioning body 1 and the positioning block 3 can ensure that the butt joint surface of the pump shell 2 and the quick connector completely matches, and the butt joint accuracy reaches ±0.1 mm.

[0032] S2, in the clamping stage, the operator starts the cylinder of the laser welder, the cylinder drives the parallelogram elastic pressing mechanism 4 to act, drives the positioning block 3 to move to the workpiece direction, and the positioning block 3 is pressed tightly to the quick connector. In the pressing process, the spring 5 built in the pressing mechanism 4 will automatically expand and contract according to the actual size of the pump shell 2 and the quick connector, compensate for the assembly tolerance within ±1.5 mm, and ensure that even if there is a slight size deviation of the workpiece, stable pressing can be realized. At the same time, the parallelogram structure makes the pressing force evenly distributed on the workpiece contact surface, avoiding local deformation of the workpiece.

[0033] S3, in the welding stage, the operator starts the welding program of the 1500W fiber laser welder, the welding gun of the laser welder is focused on the butt joint of the pump shell 2 and the quick connector, emits a laser beam to melt the metal, and forms a weld. If the tooling is equipped with a workpiece rotating device, the rotating device can be started at the same time as the welding program is started, and the pump shell 2 is driven to rotate at a preset speed. At this time, the welding gun remains in a fixed position, and 360° automatic circumferential welding work can be completed. If the rotating device is not selected, the operator can control the welding gun to complete the welding by surrounding the workpiece. During the welding process, the double-reference positioning structure guarantees the butt joint accuracy, the uniform pressing force avoids the displacement of the workpiece, the weld thickness is uniform and consistent, and the probability of defects such as virtual welding and missed welding is effectively reduced.

[0034] S4, in the unloading stage, when the welding program is completed, the laser welder automatically stops emitting the laser beam, the control system sends a signal to the cylinder, the cylinder drives the pressing mechanism 4 to act in the opposite direction, and the positioning block 3 is unlocked. The operator directly takes out the welded pump shell 2 from the profiling positioning groove 11, and the next round of positioning and welding operation can be carried out. The whole unloading process only takes 10-15 seconds.

[0035] Working principle: The working principle of the tooling includes four core stages of positioning, clamping, welding and unloading, and is matched with a modular transformation mechanism, which is as follows: The profile positioning body 1 is provided with a profile positioning groove 11 which is accurately matched with the outer shape of the pump shell 2 in a 1:1 ratio. The operator places the pump shell 2 into the profile positioning groove 11, and the inner wall of the profile positioning groove 11 is completely attached to the outer wall of the pump shell 2, thereby realizing the contour positioning of the pump shell 2 and limiting the displacement and rotation of the pump shell 2 in the horizontal direction. Then, the operator places the quick-assembly interface along the direction of the stop of the positioning block 3, and the stop structure of the positioning block 3 is accurately attached to the end face of the quick-assembly interface, thereby realizing the stop positioning of the quick-assembly interface and limiting the displacement of the quick-assembly interface in the vertical direction. The contour positioning and the stop positioning cooperatively form a double-reference positioning structure, thereby ensuring that the butt joint surface of the pump shell 2 and the quick-assembly interface is completely attached, and the butt joint accuracy reaches ±0.1 mm.

[0036] After the positioning is completed, the 1500W fiber laser welding machine is started, and the cylinder drives the parallelogram elastic pressing mechanism 4 to act, thereby driving the positioning block 3 to move towards the workpiece until the quick-assembly interface is pressed tightly. During the pressing process, the spring 5 built in the pressing mechanism 4 automatically expands and contracts according to the actual size of the workpiece, thereby compensating for the assembly tolerance within the range of ±1.5 mm, and ensuring that even if there is a slight size deviation of the workpiece, stable pressing can be realized. At the same time, the connecting rod design of the parallelogram structure uniformly distributes the pressing force on the end face of the quick-assembly interface, thereby avoiding the local depression or deformation of the workpiece caused by single-point pressing.

[0037] After the clamping is completed, the fiber laser welding machine is started, and the laser beam emitted by the laser welding machine is focused on the butt joint of the pump shell 2 and the quick-assembly interface, thereby melting the metal to form a weld. If the workpiece rotating device is selected for the tooling, the device can be started synchronously, thereby driving the profile positioning body 1 and the pump shell 2 to rotate at a constant speed, and the welding gun of the laser welding machine remains in a fixed position, so that the 360° automatic girth welding can be completed. The rotating welding method makes the heating of the laser beam on the weld more uniform, thereby effectively avoiding defects such as pores and cracks in the weld caused by local overheating, and further improving the welding quality.

[0038] After the welding operation is completed, the laser welding machine automatically stops working, the control system sends a signal to the cylinder, and the cylinder drives the pressing mechanism 4 to act reversely, thereby unlocking the positioning block 3. The operator directly takes out the welded pump shell 2 workpiece, and the next round of positioning and clamping operation can be performed. The entire unloading process only takes 10-15 seconds.

[0039] When different models of pump shells 2 need to be replaced for welding, the operator does not need to disassemble the overall frame of the tooling, but only needs to unscrew the bolts fixing the modular positioning unit, remove the profile positioning body 1 and the positioning block 3 of the current model, install the corresponding model of the modular positioning unit, and then re-tighten the bolts, so that the model change can be completed. The entire model change process does not require professional tools, is simple to operate, and takes less than 5 minutes. The modular design makes the tooling applicable to the spot welding positioning of the flange shell of the 114-328 series pump shell 2, thereby greatly improving the universality of the tooling and the flexibility of the production line.

[0040] Therefore, the pump shell 2 spot welding laser welding positioning tool and positioning method provided by the present application adopts the double-reference positioning structure combining the contour positioning of the profiling positioning body 1 and the stop opening positioning of the positioning block 3, and establishes a unified and stable positioning reference. This structure completely eliminates the subjective error of manual alignment, so that the repeatability of the tool is ±0.1 mm, and the misalignment of the interface is controlled within 0.1 mm. The high-precision positioning directly ensures the uniformity of the weld thickness, not only improves the sealing performance and running stability of the pump body, but also optimizes the fluid passage inside the pump body, so that the working efficiency of the pump body is improved. At the same time, the welding defect rate is reduced, and the rework and after-sales costs are greatly reduced. The pressing mechanism 4 adopts a parallelogram elastic pressing device, and the compensation amount of the built-in spring 5 can reach ±1.5 mm. This design can automatically adapt to the size deviation of the pump shell 2 and the quick-mounting interface caused by casting and machining, without manual adjustment. At the same time, the parallelogram structure can uniformly distribute the pressing force on the workpiece contact surface, avoiding the local deformation of the workpiece caused by single-point pressing of the traditional clamp. This feature ensures the geometric size accuracy of the pump shell 2, ensuring the smooth progress of the subsequent assembly process.

[0041] The profiling positioning body 1 and the positioning block 3 adopt a modular design and constitute an independent modular positioning unit. This unit can be used for spot welding positioning of the flange shell of the 114-328 series pump shell 2. When the pump shell 2 model needs to be replaced, only the corresponding modular positioning unit needs to be disassembled and replaced, without the need to adjust the overall structure of the tool, and the model switching time is less than 5 minutes. This design makes a production line compatible with the production of multiple specifications of pump shell 2, greatly improving the flexibility of the production line and reducing the equipment investment cost of the enterprise's new production line. The tool is adapted to a 1500W fiber laser welding machine, which can realize automatic control of the welding process. At the same time, the tool can be equipped with a workpiece rotating device, which can drive the pump shell 2 to rotate at a constant speed, and cooperate with the laser welding machine to complete 360° automatic girth welding without dead angles. The automatic operation mode completely replaces manual girth welding, shortens the welding time of a single piece, and improves the production efficiency. In addition, automatic welding reduces human intervention, further ensuring the consistency of welding quality. The operation process of the tool is simple and easy to understand, and ordinary operators can work after 1-2 hours of training, without relying on skilled welders. This feature greatly reduces the labor cost and new employee training cost of the enterprise, and also alleviates the problem of difficulty in recruiting skilled welders.

[0042] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A laser welding positioning fixture for spot welding of pump casings, characterized in that, include: A contour positioning body is provided with a contour positioning groove that precisely matches the shape of the pump casing, which is used to achieve contour positioning of the pump casing. A positioning block is disposed on one side of the contour positioning body and is used to realize the positioning of the stop of the quick-installation interface. The contour positioning body and the positioning block cooperate to form a double reference positioning structure. A clamping mechanism is connected to the positioning block. The clamping mechanism is a parallelogram elastic clamping device with a built-in spring for automatically compensating for assembly tolerances and distributing the clamping force evenly.

2. The pump casing spot welding laser welding positioning fixture according to claim 1, characterized in that, The material of the contour positioning body is 6061 aluminum alloy.

3. The pump casing spot welding laser welding positioning fixture according to claim 1, characterized in that, The compensation amount of the spring is ±1.5mm, and the repeatability of the tooling is ±0.1mm.

4. The pump casing spot welding laser welding positioning fixture according to claim 1, characterized in that, The tooling is compatible with a 1500W fiber laser welding machine.

5. The pump casing spot welding laser welding positioning fixture according to claim 1, characterized in that, The contour positioning body and the positioning pressure block adopt a modular design to form a modular positioning unit, which is used to realize the quick change of tooling.

6. The pump casing spot welding laser welding positioning fixture according to claim 5, characterized in that, The modular positioning unit is applicable to spot welding positioning of the flange housing of the 114-328 series pumps.

7. A method for positioning pump casing spot welding using laser welding, employing the pump casing spot welding laser welding positioning fixture as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Positioning stage: Place the pump casing into the contour positioning groove of the contour positioning body to achieve contour positioning of the pump casing; place the positioning pressure block inside the pump casing to achieve stop positioning. S2, Clamping stage: Start the cylinder of the laser welding machine to drive the clamping mechanism to clamp the positioning block, and automatically compensate for the assembly tolerance through the elastic compensation function of the clamping mechanism; S3, Welding stage: Start the laser welding machine to automatically perform circumferential welding on the joint between the pump housing and the quick-connect interface; S4. Unloading stage: Control the cylinder to unlock the clamping mechanism and remove the welded workpiece.

8. The pump casing spot welding laser welding positioning method according to claim 7, characterized in that, When it is necessary to change the pump casing model, replace the modular positioning unit.

Images