CN111283309A - Method and system for welding pump wheel shaft sleeve of hydraulic torque converter - Google Patents

Abstract

The present invention provides a method and system for welding a torque converter pump wheel bushing, including the following steps: Step M1: using double-gun MAG welding with a servo rotating motor, upper and lower clamping and pressing devices to establish a hydraulic torque converter pump wheel bushing Welding unit; Step M2: Clamp and position the pump wheel housing bushing with greater than predetermined accuracy; Step M3: Use MAG welding double guns to perform continuous welding in sections; Step M4: Perform real-time data collection and MES network management and control to obtain Torque converter impeller bushing welding result information. The qualified rate of the product of the invention basically reaches more than 99.8%. The whole system has high welding efficiency, small welding deformation, stable and reliable welding quality, full-process digital welding, MES system network control, scanning recipe data call, eliminating the influence of human factors, and facilitating product quality control and traceability. The invention has great popularization and application value no matter from the aspect of technology or from the aspect of economic benefit.

Description

Welding method and system for hydraulic torque converter pump wheel bushing

technical field

The invention relates to a welding system and a method thereof in the field of welding technology, in particular, to a method and system for welding a pump wheel bushing of a hydraulic torque converter.

Background technique

The current pump wheel bushing welding methods include laser welding, electron beam welding, MAG welding and other welding methods. Electron beam girth welding is performed in a vacuum environment, and the welding quality is high and the appearance is beautiful. However, vacuuming is required every time, so the total welding time is not short, and the investment cost is high. Although laser welding does not require vacuuming, it has the problems of harsh assembly and operating conditions and high investment costs. The conventional MAG welding method has low investment cost, and with the development of welding power source technology, MAG welding can also use higher welding speed, lower heat input and better welding quality, and the operation is simple. Seam forming and efficiency issues, this is an ideal welding method.

In the patent document CN204524577, the shaft sleeve structure is a flat-welded structure, and the thermal deformation is large, and the dimensional accuracy is difficult to guarantee. At the same time, the proposed shaft sleeve welding clamping device has no central positioning device, no shaft sleeve pressing device, no pump wheel shell and shaft sleeve topping device, and no circulating water cooling water device at the shaft sleeve welding position. The air cooling device located next to the workpiece is far away from the welding position. Usually, when the welding heat is not completely transferred to the edge of the workpiece at the end of welding, if the workpiece has to be cooled before taking the movement, it will greatly affect the welding efficiency. If the workpiece is removed immediately after the end, the desired cooling effect cannot be produced.

SUMMARY OF THE INVENTION

Aiming at the defects in the prior art, the purpose of the present invention is to provide a method and system for welding a shaft sleeve of a hydraulic torque converter pump wheel.

According to a method for welding a torque converter pump wheel bushing provided by the present invention, the method includes the following steps: Step M1: using double-gun MAG welding with a servo rotating motor, up and down clamping and pressing devices to establish the torque converter pump wheel bushing welding unit; Step M2: Clamp and position the pump wheel housing bushing with greater than predetermined accuracy; Step M3: Use MAG welding double guns to perform continuous welding; Step M4: Perform real-time data collection and MES network management and control to obtain liquid Torque converter impeller bushing welding result information.

Preferably, the step M2 includes: step M2.1: placing the pump wheel and the shaft sleeve on the support table, and at the same time positioning the shaft sleeve through the center of the shaft sleeve, and then rotating the air claw by 90 degrees to press the pump wheel shell, and the middle The cylinder is raised to the right position to press the end face of the welding position between the pump wheel housing and the shaft sleeve, and the three-thimble outer top device is raised to press the pump wheel housing; Step M2.2: Lock the hydraulic locking device to the middle lifting cylinder, and finally press down the device Press down on the compression bushing.

Preferably, the step M3 includes: step M3.1: during the 200-degree girth welding process performed by the two guns, various types of welding are respectively used in the arc starting section, the intermediate welding section and the arc ending section; the arc starting current (100- 150A), arc starting time (0.6-0.8s), trimming voltage (10-15), welding current (205-230A), trimming voltage (-10--16), arcing current (60-100A), arcing Time (1.5-2.0s), fine-tuning voltage (-10--16), welding speed 700-720deg/min, welding angle (200deg), DC pulse welding, unified welding;

The arc starting adopts a slightly higher current and a longer arc length, which is convenient for reliable arc starting, and at the same time, a small filling amount is used to ensure a smooth and compliant transition of the welding seam when the arc is closed. The use of fixed-point crater, lower crater current, smaller voltage and longer crater time is convenient for filling the arc crater well, preventing shrinkage and arc crater cracks, and ensuring beautiful weld formation and smooth transition. On the premise of ensuring the welding quality, the middle section maintains a faster welding speed and a larger welding specification for welding (the specification is: welding current 205-230A, welding speed: 700-720deg/min).

The pulse welding method can precisely control the heat input, which not only ensures penetration, but also precisely controls the heat input and reduces welding deformation.

Fixed-point arc starting is used to ensure reliable arc starting. Longer arc length and smaller current can avoid arc starting spot welding leakage and transition pile height. At the same time, after the arc starting is successful, the turntable rotates, which can make the arc starting and arc ending overlap. The weld transition in the joint area is smooth and supple to avoid excessive weld metal. The effect of the longer arc length is to make the arc more gentle when the arc starts, and reduce the splash.

The use of low current and low voltage to stop the arc at a fixed point can ensure that the arc crater is filled evenly and not too high. At the same time, a longer arc crater time can slow down the solidification speed of the molten pool to avoid arc crater crack defects.

The extension line of the welding wire points to the root of the groove, and is slightly offset to the direction of the pump wheel shell by 0.5mm to ensure that the root of the groove is fully penetrated and to reduce the weld metal buildup on the side of the bushing, which is convenient for the subsequent processing of the bushing, such as High frequency induction, etc.

Preferably, step M3 further includes: step M3.2: at the same time of welding, use a circulating water cooling device to quickly take away the excess heat near the welding position of the pump wheel shell and the shaft sleeve, so as to reduce the diffusion of excess heat on the workpiece, thereby It can effectively reduce the thermal shrinkage deformation caused by the welding heat input, and control the dimensional accuracy of the shaft sleeve welding.

Preferably, step M4 includes: step M4.1: before welding, scan the two-dimensional code of the pump wheel and the shaft sleeve with a scanning gun to form a product type identification code; step M4.2: reach the PLC main controller through MES, during welding, The main control system directly calls the formula data of the product according to the scan code of the product; Step M4.3: Start welding, and during the welding process, the data acquisition unit collects key process parameters such as the current, voltage and welding speed of the left and right welding power sources, and Evaluate product quality and set out-of-tolerance alarms. When the set threshold is exceeded, the system will alarm or even stop welding. At the same time, the data acquisition system will also report the corresponding welding parameters, equipment status, etc. to the MES network control unit in real time. The whole process has realized the whole process of digital and networked management and control, real-time collection, evaluation and product quality traceability of key welding data.

A torque converter pump wheel bushing welding system provided according to the present invention includes: module M1: establishing the torque converter pump wheel bushing welding unit of the present invention; module M2: welding the pump wheel housing bushing more than predetermined Precise clamping and positioning; Module M3: Use MAG welding double guns for continuous welding; Module M4: Real-time data acquisition and MES network management and control to obtain information on the welding results of torque converter pump wheel bushings.

Preferably, the module M2 includes: module M2.1: put the pump wheel and the shaft sleeve on the support table, and at the same time the shaft sleeve is positioned at the center of the shaft sleeve, and then the rotary air claw rotates 90 degrees to press the pump wheel shell, and the middle The position cylinder is raised to the right position to press the end face of the welding position between the pump wheel housing and the shaft sleeve, and the three-thimble outer top device is raised to press the pump wheel housing; Module M2.2: lock the hydraulic locking device to the middle lifting cylinder, and finally press down the device Press down on the compression bushing.

Preferably, the module M3 includes: module M3.1: in the process of 200-degree girth welding with two guns, various types of welding are respectively used in the arc starting section, the intermediate welding section and the arc ending section; the arc starting current (100- 150A), arc starting time (0.6-0.8s), trimming voltage (10-15), welding current (205-230A), trimming voltage (-10--16), arcing current (60-100A), arcing Time (1.5-2.0s), fine-tuning voltage (-10--16), welding speed 700-720deg/min, welding angle (200deg), DC pulse welding, unified welding;

The arc starting adopts a slightly higher current and a longer arc length, which is convenient for reliable arc starting, and at the same time, a small filling amount is used to ensure a smooth and compliant transition of the welding seam when the arc is closed. The use of fixed-point crater, lower crater current, smaller voltage and longer crater time is convenient for filling the arc crater well, preventing shrinkage and arc crater cracks, and ensuring beautiful weld formation and smooth transition. On the premise of ensuring the welding quality, the middle section maintains a faster welding speed and a larger welding specification for welding (the specification is: welding current 205-230A, welding speed: 700-720deg/min).

The pulse welding method can precisely control the heat input, which not only ensures penetration, but also precisely controls the heat input and reduces welding deformation.

Fixed-point arc starting is used to ensure reliable arc starting. Longer arc length and smaller current can avoid arc starting spot welding leakage and transition pile height. At the same time, after the arc starting is successful, the turntable rotates, which can make the arc starting and arc ending overlap. The weld transition in the joint area is smooth and supple to avoid excessive weld metal. The effect of the longer arc length is to make the arc more gentle when the arc starts, and reduce the splash.

The use of low current and low voltage to stop the arc at a fixed point can ensure that the arc crater is filled evenly and not too high. At the same time, a longer arc crater time can slow down the solidification speed of the molten pool to avoid arc crater crack defects.

The extension line of the welding wire points to the root of the groove, and is slightly offset to the direction of the pump wheel shell by 0.5mm to ensure that the root of the groove is fully penetrated and to reduce the weld metal buildup on the side of the bushing, which is convenient for the subsequent processing of the bushing, such as High frequency induction, etc.

Preferably, the module M3 further includes: module M3.2: at the same time of welding, a circulating water cooling device is used to quickly take away the excess heat near the welding position of the pump wheel shell and the shaft sleeve, so as to reduce the diffusion of excess heat on the workpiece, thereby It can effectively reduce the thermal shrinkage deformation caused by the welding heat input, and control the dimensional accuracy of the shaft sleeve welding.

Preferably, the module M4 includes: module M4.1: before welding, the scanning gun scans the two-dimensional code of the pump wheel and the shaft sleeve to form the product type identification code; module M4.2: reaches the PLC main controller through MES, during welding, The main control system directly calls the recipe data of the product according to the scan code of the product; module M4.3: start welding, and during the welding process, the data acquisition unit implements the collection of key process parameters such as current, voltage and welding speed of the left and right welding power sources, and Evaluate product quality and set out-of-tolerance alarms. When the set threshold is exceeded, the system will alarm or even stop welding. At the same time, the data acquisition system will also report the corresponding welding parameters, equipment status, etc. to the MES network control unit in real time. The whole process has realized the whole process of digital and networked management and control, real-time collection, evaluation and product quality traceability of key welding data.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention adopts the fillet welding of the neck of the bushing to replace the traditional flat welding of the bushing. The welding position is directly at the restraint and positioning position of the central positioning device of the bushing, the pressing device at the upper end of the bushing and the lifting device at the lower end, to the greatest extent possible. Reduce welding heat shrinkage deformation, improve product coaxiality and flatness and other important indicators;

2. In the present invention, the copper support surface at the lower end of the fillet welding of the pump wheel shell and the circulating water cooling device can reduce the heat input transmitted to the pump wheel shell by the welding of the shaft sleeve, and effectively reduce the possible damage caused by the welding of larger specifications. The large thermal shrinkage deformation ensures the accuracy of the size of the pump wheel shell bushing;

3. In the present invention, the double-gun 90-degree spot welding is cancelled, and the continuous welding is performed in sections. The welding time of one bushing is 16 seconds, including clamping, positioning, and the total working cycle is up to 45 seconds, which greatly improves the production efficiency. ;

4. In the present invention, the strategy of segmented continuous welding + fixed-point small-scale arc-starting and arc-ending welding strategy, on the premise of satisfying the welding efficiency, prevents welding leakage in the arc-starting section and at the same time ensures the smooth and compliant transition of the lap joint. The pit is full without cracks, and the welding seam stacking height and appearance are uniform.

5. In the present invention, real-time data collection, MES control, and code scanning recipe calling realize the digitization and networking of the whole process of bushing welding, data collection is convenient for product quality traceability, and the scanning code formula direct calling function avoids manual data input errors It improves the reliability and convenience of the system and reduces the influence of human factors.

6. The qualified rate of the product of the present invention basically reaches more than 99.8%. The whole system has high welding efficiency, small welding deformation, stable and reliable welding quality, full-process digital welding, MES system network control, scanning recipe data call, eliminating the influence of human factors, and facilitating product quality control and traceability. The invention has great popularization and application value no matter from the aspect of technology or from the aspect of economic benefit.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

Fig. 1 is the welding schematic diagram of the double-gun torque converter pump wheel bushing in the embodiment of the present invention;

FIG. 2 is the positional relationship between the pump wheel bushing and the welding seam in the embodiment of the present invention.

FIG. 3 is a schematic diagram of the information network structure of the pump wheel bushing welding in the embodiment of the present invention.

In the picture:

Pump impeller 1 Weld 14

Left MAG welding torch 21 Welding wire 15

Right MAG welding torch 22 MES network control system 16

Bushing 3 Data acquisition and archiving 17

Upper sleeve pressing mechanism 4 Scanning gun 18

Sleeve positioning center device 5 Control cabinet 19

Rotary gripper 6 Control system 20

Thimble 7 Welding station 23

Jacking Cylinder 8 Video Surveillance 24

Hydraulic locking device 9 Turntable 26

Central jacking cylinder 10 Circulating water cooling device 27

Servo rotation mechanism 11 Welding power source 29

Air motor 12 Scanning station 28

Timing belt 13 Display unit 30

Detailed ways

The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the inventive concept. These all belong to the protection scope of the present invention.

As shown in Figures 1-3, a torque converter pump wheel bushing welding method provided according to the present invention includes: Step M1: establishing a torque converter pump wheel bushing welding unit of the present invention; Step M2: adding The pump wheel shell bushing is clamped and positioned with greater than predetermined accuracy; Step M3: Use MAG welding double guns to perform continuous welding; Step M4: Perform real-time data acquisition and MES network management and control to obtain the torque converter pump wheel shaft Set of welding result information.

The invention relates to a welding system and a welding method for a hydraulic torque converter pump wheel bushing in the field of welding technology. Specifically, it includes the following steps: Step 1, use double-gun MAG welding with servo rotating motor, upper and lower clamping and pressing devices to establish a torque converter pump wheel bushing welding system; Step 2, perform high-precision clamping on the pump wheel bushing , positioning; step 3, based on MAG welding double gun 200-degree ring welding segmented welding strategy control; step 4, real-time data acquisition and MES network control. The whole system has high welding efficiency, high clamping and positioning accuracy, small welding deformation, stable and reliable welding quality, digital welding of the whole process, networked control of MES system, and direct transfer of scanned recipe data, which eliminates the influence of human factors and facilitates product quality control. , trace back. The invention has great popularization and application value no matter from the aspect of technology or from the aspect of economic benefit.

Preferably, the step M2 includes: step M2.1: placing the pump wheel and the shaft sleeve on the support table, and at the same time positioning the shaft sleeve through the center of the shaft sleeve, and then rotating the air claw by 90 degrees to press the pump wheel shell, and the middle The cylinder is raised to the right position to press the end face of the welding position between the pump wheel housing and the shaft sleeve, and the three-thimble outer top device is raised to press the pump wheel housing; Step M2.2: Lock the hydraulic locking device to the middle lifting cylinder, and finally press down the device Press down on the compression bushing.

Preferably, the step M3 includes: step M3.1: during the 200-degree girth welding process performed by the two guns, various types of welding are respectively used in the arc starting section, the intermediate welding section and the arc ending section; the arc starting current (100- 150A), arc starting time (0.6-0.8s), trimming voltage (10-15), welding current (205-230A), trimming voltage (-10--16), arcing current (60-100A), arcing Time (1.5-2.0s), fine-tuning voltage (-10--16), welding speed 700-720deg/min, welding angle (200deg), DC pulse welding, unified welding;

The arc starting adopts a slightly higher current and a longer arc length, which is convenient for reliable arc starting, and at the same time, a small filling amount is used to ensure a smooth and compliant transition of the welding seam when the arc is closed. The use of fixed-point crater, lower crater current, smaller voltage and longer crater time is convenient for filling the arc crater well, preventing shrinkage and arc crater cracks, and ensuring beautiful weld formation and smooth transition. On the premise of ensuring the welding quality, the middle section maintains a faster welding speed and a larger welding specification for welding (the specification is: welding current 205-230A, welding speed: 700-720deg/min).

The pulse welding method can precisely control the heat input, which not only ensures penetration, but also precisely controls the heat input and reduces welding deformation.

Fixed-point arc starting is used to ensure reliable arc starting. Longer arc length and smaller current can avoid arc starting spot welding leakage and transition pile height. At the same time, after the arc starting is successful, the turntable rotates, which can make the arc starting and arc ending overlap. The weld transition in the joint area is smooth and supple to avoid excessive weld metal. The effect of the longer arc length is to make the arc more gentle when the arc starts, and reduce the splash.

The use of low current and low voltage to stop the arc at a fixed point can ensure that the arc crater is filled evenly and not too high. At the same time, a longer arc crater time can slow down the solidification speed of the molten pool to avoid arc crater crack defects.

The extension line of the welding wire points to the root of the groove, and is slightly offset to the direction of the pump wheel shell by 0.5mm to ensure that the root of the groove is fully penetrated and to reduce the weld metal buildup on the side of the bushing, which is convenient for the subsequent processing of the bushing, such as High frequency induction, etc.

Preferably, step M3 further includes: step M3.2: at the same time of welding, use a circulating water cooling device to quickly take away the excess heat near the welding position of the pump wheel shell and the shaft sleeve, so as to reduce the diffusion of excess heat on the workpiece, thereby It can effectively reduce the thermal shrinkage deformation caused by the welding heat input, and control the dimensional accuracy of the shaft sleeve welding.

Preferably, step M4 includes: step M4.1: before welding, scan the two-dimensional code of the pump wheel and the shaft sleeve with a scanning gun to form a product type identification code; step M4.2: reach the PLC main controller through MES, during welding, The main control system directly calls the formula data of the product according to the scan code of the product; Step M4.3: Start welding, and during the welding process, the data acquisition unit collects key process parameters such as the current, voltage and welding speed of the left and right welding power sources, and Evaluate product quality and set out-of-tolerance alarms. When the set threshold is exceeded, the system will alarm or even stop welding. At the same time, the data acquisition system will also report the corresponding welding parameters, equipment status, etc. to the MES network control unit in real time. The whole process has realized the whole process of digital and networked management and control, real-time collection, evaluation and product quality traceability of key welding data.

Specifically, in one embodiment, a method for welding a torque converter impeller bushing includes:

Step 1, use double gun MAG welding and servo motor to establish a torque converter pump wheel bushing welding system;

This embodiment is implemented on the torque converter pump wheel bushing welding system 23 . As shown in Figure 1, in this embodiment, the CPU315-2PN/DP of Siemens S7-300 series is used as the core of the control system, the TP900 touch screen is used as the control unit, and the V90 servo driver and SM321/SM322 I/O modules are used to realize the control of the servo rotating device. , Control of two welding power sources 21, cylinders, etc. The two welding torches 21 and 22 are symmetrically distributed at 180 degrees. The welding torches 21 and 22 form an angle of 35 degrees with the axis of the shaft sleeve 3. At the fillet welding position, the plane of the upper pressing mechanism 4 is strictly parallel to the support table of the shaft sleeve 3, and is strictly parallel to the shaft sleeve 3. The sleeve centering device 5 must be set concentrically. The pump wheel 1 and the shaft sleeve 3 are placed on the support table and positioned by the sleeve centering device 5. The upper pressing mechanism 4, the sleeve positioning center 5 and the rotation center of the turntable 26 must be set concentrically. . The three thimbles 7 driven by the air cylinder have the same height and are evenly distributed at 120-degree intervals and have the same distance from the center 5 of the shaft sleeve. 12 is driven synchronously by the synchronous toothed belt 13, and the servo motor 11 fixedly connected with the turntable 26 mainly plays the role of rotation during welding, and precisely controls the angle and speed of the assembly welding through the position control mode.

Step 2, to achieve high-precision clamping and positioning of the pump wheel housing bushing:

Before welding starts, first place the torque converter pump wheel 1 and the shaft sleeve 3 on the support table of the turntable 26 by robot or manually, and position it by the shaft sleeve centering device 5, and then rotate the air gripper 6 in place, the center The jacking cylinder 10 rises, the jacking cylinder 8 of the three thimbles 7 rises to tighten the pump wheel housing 1, and then the hydraulic locking device 9 locks the central jacking cylinder 10, and the upper pressing cylinder 4 descends to press the shaft sleeve 3, through the The above-mentioned actions of the air cylinder and the oil cylinder respectively press the pump wheel shell 1 and the shaft sleeve 3 up and down, so as to realize the high-precision and precise positioning and clamping of the welding of the pump wheel shell 1 and the shaft sleeve 3 .

Step 3, based on MAG welding double gun 200 degree girth welding segmented welding strategy control:

After the upper pressing device 4 is in place, the two MAG guns 21 and 22 are lowered to start arcing. After the arcing is successful, the lower servo motor 11 starts to rotate and perform 200-degree double-gun 180 symmetrical welding to complete the pump wheel bushing of the torque converter. welding.

When welding the bushing 3, the angle between the welding torch and the axis of the bushing is 40 degrees, pointing to the bottom center of the fillet welding groove of the bushing, and horizontally offsetting 0.5mm to the direction of the pump wheel shell. Gun continuous girth welding method. The segmentation strategy is as follows: different welding strategies are used in the arc starting section, the intermediate welding section and the ending arc section. Starting current (100A), starting time (0.8s), trimming voltage (15), welding current (225A), trimming voltage (-16), ending current (60A), ending time (1.8s), trimming Voltage (-10), welding speed 720deg/min, welding angle (200deg), welding method DC pulse, unified welding; ensure symmetrical and uniform heat input and beautiful appearance.

Further, the circulating cooling water device 27 cools the vicinity of the welding position of the pump wheel and the shaft sleeve in real time, which significantly reduces the heat input of the pump wheel and the shaft sleeve, reduces the thermal deformation of welding, overcomes the influence of welding deformation on the size of the terminal, and improves the efficiency of the welding process. It is good to ensure the dimensional accuracy of welding and the welding quality of products.

Step 4: Real-time data collection and MES network management and control:

During welding, the scanning gun 18 scans the two-dimensional code of the pump wheel and the shaft sleeve to form the product type identification code, and then reaches the PLC main controller 19 through the MES system 16, directly calls the recipe data of the corresponding product model, and then starts welding. During the welding process, the data acquisition system 17 collects key process parameters such as welding current, voltage and welding speed, and evaluates the product quality and sets an out-of-tolerance alarm. When the set threshold is exceeded, the system alarms and stops welding. At the same time, the data acquisition system will also report the corresponding welding parameters, equipment status, etc. to the MES network management and control system in real time. The whole process has realized the whole process of digital and networked management and control, real-time collection, evaluation and product quality traceability of key welding data.

This embodiment realizes high-efficiency and high-precision welding of the pump wheel bushing, the welding seam is full and beautiful, and the transition of the overlapping area is smooth and supple. Compared with the prior art, the efficiency and quality are significantly improved. The welding time of the entire product is 16.6 seconds, and the total working time is 45 seconds. After welding, various indicators (such as the radial runout of the sleeve surface and the radial runout of the positioning shaft) are inspected, and the qualified rate of the product is over 99.98%. At the same time, the digitalization of the whole process, network management and control, direct transfer of recipe data, sweeping welding, real-time collection of welding data and product quality traceability in this embodiment greatly improve the intelligence of the production process, as well as the controllability and quality of product quality. stability.

A torque converter pump wheel bushing welding system provided according to the present invention includes: module M1: establishing the torque converter pump wheel bushing welding unit of the present invention; module M2: welding the pump wheel housing bushing more than predetermined Precise clamping and positioning; Module M3: Use MAG welding double guns for continuous welding; Module M4: Real-time data acquisition and MES network management and control to obtain information on the welding results of torque converter pump wheel bushings.

Preferably, the module M2 includes: module M2.1: put the pump wheel and the shaft sleeve on the support table, and at the same time the shaft sleeve is positioned at the center of the shaft sleeve, and then the rotary air claw rotates 90 degrees to press the pump wheel shell, and the middle The position cylinder is raised to the right position to press the end face of the welding position between the pump wheel housing and the shaft sleeve, and the three-thimble outer top device is raised to press the pump wheel housing; Module M2.2: lock the hydraulic locking device to the middle lifting cylinder, and finally press down the device Press down on the compression bushing.

Preferably, the module M3 includes: module M3.1: in the process of 200-degree girth welding with two guns, various types of welding are respectively used in the arc starting section, the intermediate welding section and the arc ending section; the arc starting current (100- 150A), arc starting time (0.6-0.8s), trimming voltage (10-15), welding current (205-230A), trimming voltage (-10--16), arcing current (60-100A), arcing Time (1.5-2.0s), fine-tuning voltage (-10--16), welding speed 700-720deg/min, welding angle (200deg), DC pulse welding, unified welding;

The arc starting adopts a slightly higher current and a longer arc length, which is convenient for reliable arc starting, and at the same time, a small filling amount is used to ensure a smooth and compliant transition of the welding seam when the arc is closed. The use of fixed-point crater, lower crater current, smaller voltage and longer crater time is convenient for filling the arc crater well, preventing shrinkage and arc crater cracks, and ensuring beautiful weld formation and smooth transition. On the premise of ensuring the welding quality, the middle section maintains a faster welding speed and a larger welding specification for welding (the specification is: welding current 205-230A, welding speed: 700-720deg/min).

The pulse welding method can precisely control the heat input, which not only ensures penetration, but also precisely controls the heat input and reduces welding deformation.

Fixed-point arc starting is used to ensure reliable arc starting. Longer arc length and smaller current can avoid arc starting spot welding leakage and transition pile height. At the same time, after the arc starting is successful, the turntable rotates, which can make the arc starting and arc ending overlap. The weld transition in the joint area is smooth and supple to avoid excessive weld metal. The effect of the longer arc length is to make the arc more gentle when the arc starts, and reduce the splash.

The use of low current and low voltage to stop the arc at a fixed point can ensure that the arc crater is filled evenly and not too high. At the same time, a longer arc crater time can slow down the solidification speed of the molten pool to avoid arc crater crack defects.

The extension line of the welding wire points to the root of the groove, and is slightly offset to the direction of the pump wheel shell by 0.5mm to ensure that the root of the groove is fully penetrated and to reduce the weld metal buildup on the side of the bushing, which is convenient for the subsequent processing of the bushing, such as High frequency induction, etc.

Preferably, the module M3 further includes: module M3.2: at the same time of welding, a circulating water cooling device is used to quickly take away the excess heat near the welding position of the pump wheel shell and the shaft sleeve, so as to reduce the diffusion of excess heat on the workpiece, thereby It can effectively reduce the thermal shrinkage deformation caused by the welding heat input, and control the dimensional accuracy of the shaft sleeve welding.

Preferably, the module M4 includes: module M4.1: before welding, the scanning gun scans the two-dimensional code of the pump wheel and the shaft sleeve to form the product type identification code; module M4.2: reaches the PLC main controller through MES, during welding, The main control system directly calls the recipe data of the product according to the scan code of the product; module M4.3: start welding, and during the welding process, the data acquisition unit implements the collection of key process parameters such as current, voltage and welding speed of the left and right welding power sources, and Evaluate product quality and set out-of-tolerance alarms. When the set threshold is exceeded, the system will alarm or even stop welding. At the same time, the data acquisition system will also report the corresponding welding parameters, equipment status, etc. to the MES network control unit in real time. The whole process has realized the whole process of digital and networked management and control, real-time collection, evaluation and product quality traceability of key welding data.

Specifically, in one embodiment, the pump wheel bushing welding system includes: a pump wheel housing 1 , a left MAG welding torch 21 , a right MAG welding torch 22 , a bushing 3 , a bushing lower pressing mechanism 4 , and a bushing center positioning device 5 Set and rotate air gripper 6, thimble 7, jacking cylinder 8, hydraulic locking device 9, center jacking cylinder 10, center jacking device, outer jacking device, hydraulic locking device, circulating water cooling device 27, servo rotating device 11. Turntable 26, as well as control system, data acquisition system, MES system, code scanning gun, welding power source, and video surveillance.

The two left and right MAG welding torches are arranged symmetrically at 180 degrees along the circumferential direction of the pump wheel shell. The angle between the welding torch and the axis of the bushing is 30-45 degrees, and the extension line of the welding wire points to the center of the fillet welding between the pump wheel shell and the bushing. And offset 0.5mm in the horizontal direction.

The circulating water cooling device specifically refers to that a circulating water cooling device is arranged under the support table connected to the central positioning device of the shaft sleeve, and the support table is usually made of copper with excellent thermal conductivity. During welding, under the conduction of circulating cooling water and heat-conducting copper, the heat near the welding position of the bushing can be directly and quickly transferred out, which greatly reduces the heat input of the workpiece and effectively prevents the heat shrinkage and deformation of the welding.

The outer jacking device is three thimbles evenly spaced at 120-degree intervals, which are strictly located on the same plane, and are driven by a lower jacking cylinder to lift. Different product types determine the appropriate jacking position on the impeller housing.

The shown rotary pressing device specifically refers to: including a rotary air gripper, a toothed synchronous belt and a starter motor. When working, the synchronous belt is driven by the starting motor, and the synchronous belt drives three rotating air grippers. The three air grippers are evenly distributed at an interval of 120 degrees and are strictly on the same plane. The height of the rotating air gripper is precisely adjustable, which is convenient to determine the pressing height according to different product types. The air motor is installed on the turntable table.

The locking device specifically refers to: after the central jacking cylinder and the outer jacking cylinder are tightened in place, the jacking cylinder is locked by hydraulic drive to prevent the lower cylinder from pressing down the shaft sleeve when the upper cylinder is pressed down. The position of the cylinder is shifted.

Further, except for the upper sleeve pressing device, all the other devices are located on the rotating turntable and are arranged concentrically. During welding, the turntable is controlled by the lower rotating servo device, and the position control mode of the servo motor is used to accurately control the position of the sleeve. angle and speed.

The shown upper pressing device specifically refers to: driven by the upper lifting cylinder to press down the shaft sleeve. The pressing device must be strictly coaxial with the centering device of the bushing on the support table.

Further, the rotating air claw presses the top surface of the pump wheel, the central cylinder pushes against the connection surface between the shaft sleeve and the pump wheel, the outer thimble pushes against the inner effective surface of the pump wheel shell, the center positioning device precisely positions the shaft sleeve, and the upper The cylinder is pressed down to compress the shaft sleeve, and finally the lifting cylinder is locked by the hydraulic locking device, so that the high-precision clamping of the pump wheel and the shaft sleeve is realized through the inner top, the outer top, the external pressure, the internal pressure, the locking, and the center positioning. and positioning.

In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying the indicated device. Or elements must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present application.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essential content of the present invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily, provided that there is no conflict.

Claims (10)

1. A method for welding a pump wheel shaft sleeve of a hydraulic torque converter is characterized by comprising the following steps:

step M1: a double-gun MAG welding is adopted to match with a servo rotating motor, and an upper clamping and pressing device and a lower clamping and pressing device are adopted to establish a hydraulic torque converter pump wheel shaft sleeve welding unit;

step M2: clamping and positioning the pump wheel casing shaft sleeve with more than preset precision;

step M3: continuously welding in segments by using MAG welding double guns;

step M4: and data real-time acquisition and MES networked control are carried out, and the welding result information of the pump axle sleeve of the hydraulic torque converter is obtained.

2. The torque converter pump hub sleeve welding method of claim 1, wherein the step M2 comprises:

step M2.1: the pump wheel and the shaft sleeve are arranged on a supporting table surface, the shaft sleeve is positioned through the center of the shaft sleeve, then the rotary air claw rotates by 90 degrees to press the pump wheel shell, the middle cylinder ascends to a position to tightly push the end surface of the welding position of the pump wheel shell and the shaft sleeve, and the three-thimble outer jacking device ascends to tightly push the pump wheel shell;

step M2.2: and locking the lifting cylinder in the middle of the hydraulic locking device, and finally pressing the pressing shaft sleeve by the pressing device.

3. The torque converter pump hub sleeve welding method of claim 1, wherein the step M3 comprises:

step M3.1: in the process of welding two guns by 200-degree girth welding, a plurality of welding strategies are respectively adopted in an arc starting section, a middle welding section and an arc ending section, and welding parameters in the plurality of welding strategies are as follows:

the arc starting current is 100-150A, the arc starting time is 0.6-0.8s, the trimming voltage is 10-15V, the welding current is 205-230A, the trimming voltage is-10-16, the arc closing current is 60-100A, the arc closing time is 1.5-2.0s, the trimming voltage is-10-16V, the welding speed is 700-720deg/min, the welding angle is 200deg, and the direct current pulse welding and the unified welding are adopted.

4. The torque converter pump hub sleeve welding method of claim 3, wherein step M3 further comprises:

step M3.2: and during welding, a circulating water cooling device is adopted to take away heat near the welding position of the pump wheel shell and the shaft sleeve.

5. The torque converter pump hub sleeve welding method of claim 1, wherein step M4 comprises:

step M4.1: before welding, a scanning gun scans two-dimensional codes of the pump wheel and the shaft sleeve to form a product type identification code;

step M4.2: the PLC main controller is issued by the MES, and during welding, the main control unit directly calls the formula data of the product according to the scanning code of the product;

step M4.3: and starting welding, wherein in the welding process, the data acquisition unit acquires key process parameters such as current, voltage, welding speed and the like of the left and right welding power supplies, evaluates the product quality and sets out an out-of-tolerance alarm, and when the set threshold value is exceeded, the data acquisition unit alarms and even stops welding, and simultaneously, the data acquisition unit can report corresponding welding parameters, equipment states and the like to the MES network control unit in real time.

6. A torque converter pump axle sleeve welding system, comprising:

module M1: a double-gun MAG welding is adopted to match with a servo rotating motor, and an upper clamping and pressing device and a lower clamping and pressing device are adopted to establish a hydraulic torque converter pump wheel shaft sleeve welding unit;

module M2: clamping and positioning the pump wheel casing shaft sleeve with more than preset precision;

module M3: continuously welding in segments by using MAG welding double guns;

module M4: and data real-time acquisition and MES networked control are carried out, and the welding result information of the pump axle sleeve of the hydraulic torque converter is obtained.

7. The torque converter pump hub sleeve welding system of claim 6, wherein said module M2 comprises:

module M2.1: the pump wheel and the shaft sleeve are arranged on a supporting table surface, the shaft sleeve is positioned through the center of the shaft sleeve, then the rotary air claw rotates by 90 degrees to press the pump wheel shell, the middle cylinder ascends to a position to tightly push the end surface of the welding position of the pump wheel shell and the shaft sleeve, and the three-thimble outer jacking device ascends to tightly push the pump wheel shell;

module M2.2: and locking the lifting cylinder in the middle of the hydraulic locking device, and finally pressing the pressing shaft sleeve by the pressing device.

8. The torque converter pump hub sleeve welding system of claim 6, wherein said module M3 comprises:

module M3.1: in the process of welding two guns by 200-degree girth welding, a plurality of welding strategies are adopted in an arc starting section, a middle welding section and an arc ending section respectively, and welding parameters in the plurality of welding strategies are as follows:

the arc starting current is 100-150A, the arc starting time is 0.6-0.8s, the trimming voltage is 10-15V, the welding current is 205-230A, the trimming voltage is-10-16, the arc closing current is 60-100A, the arc closing time is 1.5-2.0s, the trimming voltage is-10-16V, the welding speed is 700-720deg/min, the welding angle is 200deg, and the direct current pulse welding and the unified welding are adopted.

9. The torque converter pump hub sleeve welding system of claim 8, wherein module M3 further comprises:

module M3.2: and during welding, a circulating water cooling device is adopted to take away heat near the welding position of the pump wheel shell and the shaft sleeve.

10. The torque converter pump hub sleeve welding system of claim 6, wherein module M4 comprises:

module M4.1: before welding, a scanning gun scans two-dimensional codes of the pump wheel and the shaft sleeve to form a product type identification code;

module M4.2: the PLC main controller is issued by the MES, and during welding, the main control unit directly calls the formula data of the product according to the scanning code of the product;

module M4.3: and starting welding, wherein in the welding process, the data acquisition unit acquires key process parameters such as current, voltage, welding speed and the like of the left and right welding power supplies, evaluates the product quality and sets out an out-of-tolerance alarm, and when the set threshold value is exceeded, the data acquisition unit alarms and even stops welding, and simultaneously, the data acquisition unit can report corresponding welding parameters, equipment states and the like to the MES network control unit in real time.

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