Positioning and welding device applicable to welding of inner claw pole and outer claw pole of motor
By designing a positioning and welding device that includes components such as a mandrel, baffle, and pressure plate, and utilizing the difference in the thermal expansion coefficients of materials, precise control of the concentricity and axial position of the starting DC generator claw pole assembly is achieved. This solves the problem of difficulty in ensuring concentricity and axial position during the welding process, simplifies the tooling structure, and improves welding efficiency.
Patent Information
- Application Number
- CN202423184038.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-23
AI Technical Summary
During the welding process of the starting DC generator claw pole assembly, it is difficult to ensure the concentricity and axial position of the inner and outer claw poles, and the tooling is prone to interfering with the connecting block during the welding process, which increases the workload.
A positioning and welding device comprising a mandrel, baffle, pressure plate, gasket, nut, support plate and base plate is adopted. By utilizing the difference in the thermal expansion coefficient of the materials, the inner and outer claw poles are self-locked by preheating to ensure concentricity and axial position, and to maintain the limiting function during the welding process.
It achieves precise control of the concentricity and axial position of the inner and outer claw poles, simplifies the welding fixture, avoids interference between the fixture and the connecting block, and improves welding efficiency and the convenience of workpiece replacement.
Smart Images
Figure CN223656284U_ABST
Abstract
Description
Technical Field
[0001] This utility model discloses a device for positioning and welding in the welding of inner and outer claw poles of motors, belonging to the technical field of welding tooling for cantilever claw poles of motors. Background Technology
[0002] In this starting DC generator claw pole assembly, the outer and inner claw poles are suspended and fixed by connecting blocks. As the claw pole assembly is a component of the motor rotor, concentricity of the inner and outer claw poles must be ensured during welding. The outer claw pole is shorter than the inner claw pole, requiring not only radial concentricity but also axial control of their relative position. Using spacers for axial positioning of the shorter outer claw pole presents challenges due to the significant dimensional variations in both inner and outer claw poles. The slider, located on the outermost side of the inner and outer claw poles and adjacent to the limiting spacers, is prone to being welded together during welding, increasing subsequent workload.
[0003] The cantilever structure's inner and outer claws are a novel structural form, with no similar tooling available. Therefore, it is necessary to design a suitable welding device to ensure smooth welding. Summary of the Invention
[0004] The purpose of this invention is:
[0005] During the machining process of the DC generator claw pole assembly, this positioning and welding device enables the welding of the outer and inner claw poles, which are suspended in the air and fixed by connecting blocks. It ensures: the concentricity of the inner and outer claw poles; the axial alignment of the inner and outer claw poles; that the tooling does not interfere with welding when the connecting block is on the outermost side; that thermal expansion self-locking is achieved by utilizing the high temperature maintained before and during welding, thus simplifying the tooling; and that the welding position can be easily changed during the welding process.
[0006] The technical solution of this invention is:
[0007] The novel experimental device adopts the following technical solution: a device for positioning and welding of inner and outer claw poles of an electric motor, comprising: a spindle 1, a baffle 2, a long screw 3, a pressure plate 4, a washer 5, a nut 6, two support plates 7, and a base plate 8; the two support plates 7 are respectively fixedly installed at both ends of the base plate 8, the spindle 1 is placed in the U-shaped groove of the support plate 7, the pressure plate 4 is installed at one end of the spindle 1 through the washer 5 and the nut 6, the baffle 2 is installed at the other end of the spindle 1, and a long screw 3 is installed at each end of the baffle 2.
[0008] The spindle 1 slides into the inner hole of the inner claw pole, and the outer circle of the pressure plate 4 slides into the inner hole of the outer claw pole.
[0009] The pressing plate 4 is provided with an assembly boss at one end, which is matched with the inner hole of the outer claw pole, and the center hole is matched with the mandrel 1.
[0010] The baffle 2 is a circular plate structure, the center hole is matched with the mandrel 1, and 8 threaded holes are uniformly distributed on the circular surface, and the 8 long screws 3 are installed in the threaded holes.
[0011] The center of the threaded hole is in the same horizontal plane with the claw pole end surface.
[0012] The mandrel 1 is provided with a limiting step at one end on both sides, the baffle 2 is located on the limiting step, and the other end is provided with a thread and connected with the nut 6.
[0013] The beneficial effects of the present application are:
[0014] The device for positioning and welding of the inner and outer claw poles is put into an oven for preheating, and after preheating, the characteristics that the expansion coefficient of the tooling is greater than the expansion coefficient of the workpiece are used to realize the positioning of the inner and outer claw poles through heating, so that the concentricity requirement of the inner and outer claw poles is ensured; after heating, the baffle protrudes out of the ring and expands, and the outer claw pole is positioned in the radial direction; the mandrel expands after heating, and the inner claw pole is positioned in the radial direction, and the continuous heat input during the welding process will maintain this positioning function, so that the purpose of simplifying the tooling is achieved; and the function of conveniently replacing the welding position during the welding process is achieved. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 Front view of tooling;
[0016] Figure 2 Front view of tooling after installing workpiece;
[0017] Figure 3 Structure diagram of mandrel;
[0018] Figure 4 Front view and central section view of baffle;
[0019] Figure 5 Central section view of pressing plate;
[0020] Figure 6 Front view and bottom view of support;
[0021] Figure 7 Front view and A-A section view of bottom plate.
[0022] Wherein: 1-mandrel, 2-baffle, 3-long screw, 4-pressing plate, 5-gasket, 6-nut, 7-support plate, 8-bottom plate, 9-screw. DETAILED DESCRIPTION
[0023] The present utility model is further described below in combination with the drawings:
[0024] For example, Figure 1As shown, a device suitable for positioning and welding in the welding of inner and outer claw pole of motor, comprising: mandrel 1, baffle 2, long screw 3, pressing plate 4, gasket 5, nut 6, two support plates 7, bottom plate 8; two support plates 7 are respectively fixedly installed at both ends of the bottom plate 8, the mandrel 1 is placed in the U-shaped groove of the support plate 7, the pressing plate 4 is installed at one end of the mandrel 1 through the gasket 5 and the nut 6, the baffle 2 is installed at the other end of the mandrel 1, and one long screw 3 is installed at each end of the baffle 2.
[0025] As shown in Figure 3 The mandrel 1 is provided with a limiting step at one end of the two sides, the baffle 2 is located on the limiting step, and the other end is provided with a thread connected with the nut 6. The mandrel 1 is in sliding fit with the inner hole of the inner claw pole, and the convex outer circle of the pressing plate 4 is in sliding fit with the inner hole of the outer claw pole. By the different thermal expansion coefficients of the aluminum alloy tooling and the alloy steel workpiece, the inner and outer claw poles are installed on the tooling, and the axial and radial self-locking of the inner and outer claw poles on the tooling is realized during preheating before welding and welding process, so that the relative position is ensured.
[0026] As shown in Figure 5 The pressing plate 4 is provided with an assembly boss at one end, which is matched with the inner hole of the outer claw pole, and the center hole is matched with the mandrel 1.
[0027] As shown in Figure 4 The baffle 2 is a circular plate structure, the center hole is matched with the mandrel 1, the circular surface is uniformly distributed with 8 threaded holes, and 8 long screws 3 are installed in the threaded holes.
[0028] The installation and use method of the device:
[0029] The welding support composed of the support plate 7, the bottom plate 8 and the screw 9 supports the workpiece installed in the tooling during baking and welding. The inner claw pole is placed in the mandrel 1, and the claw pole circular surface is located against the baffle 2; one side of the outer claw pole circular surface is located against the pressing plate 4 positioning surface, and the outer claw pole inner hole is placed on the baffle 4 positioning boss. The baffle 4 and the outer claw pole are placed on the mandrel, and the inner and outer claw poles are placed opposite to each other, the gasket 5 is placed, the nut 6 is tightened, and the inner claw pole is axially positioned; the bolt 3 is tightened, and the outer claw pole is axially positioned. The tooling is placed in the oven together with the workpiece, and the tooling is preheated. After preheating, the tooling has a greater expansion coefficient than the workpiece, and the inner and outer claw poles are limited by heating. After heating, the baffle protrudes outward and expands, and the outer claw pole is radially positioned. After preheating, the screw 3 is removed before welding, which facilitates the placement of the connecting block used to connect the inner and outer claw poles to the outermost side to achieve the best stress effect. The continuous heat input during welding will maintain this limiting function. After welding, the workpiece and the tooling are cooled, and the welded workpiece can be easily removed.
[0030] The long screw 3 is used to limit the outer claw pole in the axial direction in the cooling state, and the long screw 3 is removed after the self-locking is formed by heating, so that the welding of the connecting block is prevented from being interfered, and the connecting block is ensured to be distributed on the outermost side of the claw pole, and has the best mechanical property position.
Claims
1. A device for positioning and welding in the welding of inner and outer claw poles of an electric motor, characterized in that, It includes a spindle (1), a baffle (2), long screws (3), a pressure plate (4), a washer (5), a nut (6), two support plates (7), and a base plate (8); the two support plates (7) are fixedly installed at both ends of the base plate (8), the spindle (1) is placed in the U-shaped groove of the support plate (7), the pressure plate (4) is installed at one end of the spindle (1) through the washer (5) and the nut (6), the baffle (2) is installed at the other end of the spindle (1), and long screws (3) are evenly distributed on the surface of the baffle (2).
2. The device for positioning and welding in the welding of inner and outer claw poles of an electric motor according to claim 1, characterized in that, The spindle (1) slides into the inner hole of the inner claw pole, and the outer circle of the pressure plate (4) slides into the inner hole of the outer claw pole.
3. The device for positioning and welding in the welding of inner and outer claw poles of an electric motor according to claim 1, characterized in that: The pressure plate (4) has an assembly boss at one end, which fits with the inner hole of the outer claw pole and the central hole spindle (1).
4. The device for positioning and welding in the welding of inner and outer claw poles of an electric motor according to claim 1, characterized in that: The baffle (2) is a circular plate structure with a central hole that fits with the spindle (1). Eight threaded holes are evenly distributed on the circular surface, and eight long screws (3) are installed in the threaded holes.
5. The device for positioning and welding in the welding of inner and outer claw poles of an electric motor according to claim 4, characterized in that: The center of the threaded hole and the extreme face of the claw are on the same horizontal plane.
6. The device for positioning and welding in the welding of inner and outer claw poles of an electric motor according to claim 1, characterized in that: The spindle (1) has a limiting step on one end on both sides, and the baffle (2) rests on the limiting step. The other end is threaded and connected to the nut (6).