Strain resistant welding fixture and mandrel

Abstract

The utility model discloses a prevent tearing welding tool and mandrel belong to motor manufacturing field, and mandrel is fixed in bottom plate, and upper arc plate and lower arc plate are located respectively in the both ends of mandrel, and the installation space of installing laminated sheet is formed between upper arc plate and lower arc plate, and the recess is located respectively in the both ends of mandrel, and the recess is located the outer wall of mandrel and extends along mandrel axial direction, and the position of recess and the welding pass of iron core are located on same straight line, and the recess of mandrel top extends to the bottom of upper arc plate, and the recess of mandrel bottom extends to the top of lower arc plate, through above -mentioned design, when prevent tearing welding tool long -time use, and when upper arc plate or lower arc plate is punched by laser, a part of the light of laser will shoot at the recess of mandrel, and the welding point of convex is formed in the recess, and because the recess is lower than the outer surface of mandrel, so the welding point is also lower than the outer surface of mandrel, when iron core and mandrel are separated, and the welding point will not tear the inside diameter of iron core.

Description

Technical Field

[0001] This utility model relates to the field of motor manufacturing, and in particular to anti-tear welding fixtures and mandrels. Background Technology

[0002] Motor cores are typically formed by stacking and welding laminations. During core welding, a laser beam is emitted from the laser welding head, and at the corresponding weld bead, the laser direction at the top of the weld bead is as follows: Figure 1 As shown: The laser beam passes from point A, the upper end of the outer diameter of the iron core 20, to point B of the arc-starting plate 30. With prolonged use of the welding fixture, the thin wall of the arc-starting plate 30 will be penetrated by the laser. Consequently, some of the residual laser light will hit point C on the surface of the mandrel 10, damaging the surface of the mandrel 10 and forming a protruding weld point. After welding is completed, the iron core 20 detaches from the mandrel 10, and the weld point on the surface of the mandrel 10 will damage the inner diameter of the iron core 20. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide a welding fixture that can prevent the formation of welding points on the surface of the mandrel and prevent damage from pull-out.

[0004] In order to overcome the shortcomings of the prior art, the second objective of this utility model is to provide a pull-resistant welded mandrel that can avoid the formation of weld points on the mandrel surface.

[0005] One of the objectives of this utility model is achieved through the following technical solution:

[0006] A welding fixture designed to prevent scratching includes a base plate, a mandrel, an upper arc-starting plate, and a lower arc-starting plate. The mandrel is fixed to the base plate and is used to mount laminated plates. The upper and lower arc-starting plates are located at both ends of the mandrel, forming an installation space between them. The upper and lower arc-starting plates abut against both ends of the iron core formed by the laminated plates. The mandrel has grooves at both ends, located on the outer wall of the mandrel and extending axially. The grooves are aligned with the weld bead of the iron core. The groove at the top of the mandrel extends to the bottom of the upper arc-starting plate, and the groove at the bottom of the mandrel extends to the top of the lower arc-starting plate.

[0007] Furthermore, the length of the groove at the top of the mandrel is greater than the height of the upper arc-drawing plate, and the length of the groove at the bottom of the mandrel is greater than the height of the lower arc-drawing plate.

[0008] Furthermore, one end of the groove is located at the end of the mandrel, and the groove is a slot.

[0009] Furthermore, the length of the groove at the bottom of the mandrel is greater than the length of the groove at the top of the mandrel.

[0010] Furthermore, the groove length at the bottom of the mandrel is 50mm-70mm, and the groove length at the top of the mandrel is 30mm-40mm.

[0011] Furthermore, the depth of the groove is 2mm-4mm.

[0012] Furthermore, there are multiple grooves, and the multiple grooves are evenly distributed at intervals on the outer wall of the mandrel.

[0013] Furthermore, the anti-tear welding fixture also includes a top plate and a guide post. The guide post is fixed to the bottom plate and extends vertically. The top plate is installed at the top of the guide post, and the upper arc-guiding plate is fixed to the bottom of the top plate.

[0014] Furthermore, the anti-tear welding fixture also includes an elastic element, which is sleeved on the guide post. Both ends of the elastic element abut against the guide post and the top plate respectively, so that the top plate is elastically connected to the guide post.

[0015] The second objective of this utility model is achieved by the following technical solution:

[0016] A mandrel with grooves at both ends, the grooves being located on the outer wall of the mandrel and extending along the axial direction of the mandrel, one end of the groove being located at the end of the mandrel, and the groove being a slot.

[0017] Compared to existing technologies, the mandrel of this utility model has grooves at both ends. The grooves are located on the outer wall of the mandrel and extend along the axial direction of the mandrel. The position of the grooves is on the same straight line as the weld bead of the iron core. The groove at the top of the mandrel extends to the bottom of the upper arc plate, and the groove at the bottom of the mandrel extends to the top of the lower arc plate. With the above design, when the anti-pull-damage welding fixture is used for a long time and the upper or lower arc plate is penetrated by the laser, part of the residual light of the laser will hit the groove of the mandrel, forming a raised welding point in the groove. Since the groove is lower than the outer surface of the mandrel, the welding point is also lower than the outer surface of the mandrel. When the iron core is separated from the mandrel, the welding point will not damage the inner diameter of the iron core. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the protruding welding points formed by surface scratches on a mandrel in the background art.

[0019] Figure 2 This is a perspective view of the anti-tear welding fixture of this utility model;

[0020] Figure 3 for Figure 2 Front view of the mandrel of the anti-pull-out welding fixture;

[0021] Figure 4 for Figure 3 Top view of the mandrel;

[0022] Figure 5 for Figure 2 A cross-sectional view of the anti-tear welding fixture;

[0023] Figure 6 for Figure 5 A partial structural diagram of the anti-tear welding fixture.

[0024] In the diagram: 10, mandrel; 11, groove; 20, iron core; 30, upper arc plate; 40, base plate; 50, lower arc plate; 60, top plate; 70, guide post; 80, turntable. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or it can be fixed through another intermediate component. When a component is said to be "connected to" another component, it can be directly connected to the other component or it may be fixed through another intermediate component. When a component is said to be "set on" another component, it can be set directly on the other component or it may be set through another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Please see Figures 2 to 5 This utility model anti-tear welding fixture is used for welding an iron core 20 formed by stacking laminations, specifically a stator or rotor.

[0029] The anti-tear welding fixture includes a mandrel 10, an upper arc guide plate 30, a base plate 40, a lower arc guide plate 50, a top plate 60, a guide post 70, and a turntable 80.

[0030] The mandrel 10 is provided with grooves 11. The grooves 11 are located on the outer wall of the mandrel 10 and extend in a direction parallel to the axis. There are multiple grooves 11, located at the top and bottom of the mandrel 10. The grooves 11 at the top of the mandrel 10 are evenly spaced. The grooves 11 at the bottom of the mandrel 10 correspond to the grooves 11 at the top of the mandrel 10 and are located on the straight line of the weld bead. Specifically, all grooves 11 extend from the end of the mandrel 10. The grooves 11 at the top of the mandrel 10 extend downwards from the top of the mandrel 10, forming a slotted structure. The grooves 11 at the bottom of the mandrel 10 extend upwards from the bottom of the mandrel 10, forming a slotted structure. The length of the groove 11 at the bottom of the mandrel 10 is greater than the length of the groove 11 at the top of the mandrel 10. Specifically, the length of the groove 11 at the bottom of the mandrel 10 is 50mm-70mm, and the length of the groove 11 at the top of the mandrel 10 is 30mm-40mm. In this embodiment, the length of the groove 11 at the bottom of the mandrel 10 is 60mm, and the length of the groove 11 at the top of the mandrel 10 is 35mm. The depth of the groove 11 is 2mm-4mm, specifically, in this embodiment, the depth of the groove 11 is 3mm.

[0031] The base plate 40 is fixed to the turntable 80, and the turntable 80 drives the base plate 40 to rotate, so as to facilitate welding of different weld passes.

[0032] The lower arc-starting plate 50 is mounted on the base plate 40, and the mandrel 10 is fixed to the base plate 40. The lower arc-starting plate 50 and the mandrel 10 rotate with the base plate 40. The lower arc-starting plate 50 is used to support the stacked plates. When welding the weld bead formed by the stacked plates, the starting point or ending point of the weld is near the lower arc-starting plate 50. At this time, the laser will irradiate the lower arc-starting plate 50. When the fixture is used for a long time, the side wall of the lower arc-starting plate 50 will be penetrated, and the laser will irradiate the mandrel 10, thus creating a raised weld point on the mandrel 10. The mandrel 10 is used to fit the stacked plates and position them during welding. The outer wall of the mandrel 10 is in contact with the inner wall of the iron core 20.

[0033] The guide post 70 is fixed to the base plate 40 and extends vertically. The top plate 60 is installed at the top of the guide post 70. An elastic element is sleeved on the guide post 70, with one end abutting against the guide post 70 and the other end abutting against the top plate 60, so that the top plate 60 and the guide post 70 are floatingly connected. In this embodiment, the elastic element is a spring.

[0034] The upper arc-drawing plate 30 is fixed to the bottom of the top plate 60. When multiple laminations are stacked and welded to form the iron core 20, the upper arc-drawing plate 30 presses against the topmost lamination, and the lower arc-drawing plate 50 presses against the bottommost lamination. Since the length of the groove 11 at the top of the mandrel 10 is greater than the height of the upper arc-drawing plate 30, the bottom end of the groove 11 at the top of the mandrel 10 is below the bottom of the upper arc-drawing plate 30, preventing the laser from penetrating the arc-drawing plate 30 and irradiating the outer wall of the mandrel 10 during laser welding. Since the length of the groove 11 at the bottom of the mandrel 10 is greater than the height of the lower arc-drawing plate 50 and the bottom plate 40, the top end of the groove 11 at the bottom of the mandrel 10 is at the top of the lower arc-drawing plate 50, preventing the laser from penetrating the lower arc-drawing plate 50 and irradiating the outer wall of the mandrel 10 during laser welding.

[0035] Please continue reading. Figure 6 When the anti-tear welding fixture is used, the laser is emitted from the laser welding head and irradiates point A of the end lamination of the iron core 20, and then points B of the upper arc plate 30. When the upper arc plate 30 is pierced by the laser, part of the laser hits the groove 11 of the mandrel 10. Since the groove 11 is lower than the outer surface of the mandrel 11, the welding point is also lower than the outer surface of the mandrel 11. When the iron core 20 is separated from the mandrel 11, the welding point will not tear the inner diameter of the iron core 20.

[0036] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of this utility model, and all of these fall within the protection scope of this utility model.

Claims

1. A welding fixture for preventing pull-out, comprising a base plate, a mandrel, an upper arc-guiding plate, and a lower arc-guiding plate, wherein the mandrel is fixed to the base plate and is used to mount laminated plates; the upper and lower arc-guiding plates are respectively located at both ends of the mandrel, forming an mounting space for mounting the laminated plates between the upper and lower arc-guiding plates; the upper and lower arc-guiding plates respectively abut against both ends of the iron core formed by the laminated plates, characterized in that: The mandrel has grooves at both ends. The grooves are located on the outer wall of the mandrel and extend along the axial direction of the mandrel. The position of the grooves is on the same straight line as the weld bead of the iron core. The groove at the top of the mandrel extends to the bottom of the upper arc-drawing plate, and the groove at the bottom of the mandrel extends to the top of the lower arc-drawing plate.

2. The anti-tear welding fixture according to claim 1, characterized in that: The length of the groove at the top of the mandrel is greater than the height of the upper arc-drawing plate, and the length of the groove at the bottom of the mandrel is greater than the height of the lower arc-drawing plate.

3. The anti-tear welding fixture according to claim 2, characterized in that: One end of the groove is located at the end of the mandrel, and the groove is a slot.

4. The anti-tear welding fixture according to claim 2, characterized in that: The length of the groove at the bottom of the mandrel is greater than the length of the groove at the top of the mandrel.

5. The anti-tear welding fixture according to claim 4, characterized in that: The groove at the bottom of the mandrel is 50mm-70mm long, and the groove at the top of the mandrel is 30mm-40mm long.

6. The anti-tear welding fixture according to claim 1, characterized in that: The depth of the groove is 2mm-4mm.

7. The anti-tear welding fixture according to claim 1, characterized in that: The number of grooves is multiple, and the multiple grooves are evenly distributed at intervals on the outer wall of the mandrel.

8. The anti-tear welding fixture according to claim 1, characterized in that: The anti-tear welding fixture also includes a top plate and a guide post. The guide post is fixed to the bottom plate and extends vertically. The top plate is installed at the top of the guide post, and the upper arc-guiding plate is fixed at the bottom of the top plate.

9. The anti-tear welding fixture according to claim 8, characterized in that: The anti-tear welding fixture also includes an elastic element, which is sleeved on the guide post. Both ends of the elastic element abut against the guide post and the top plate respectively, so that the top plate is elastically connected to the guide post.

10. A mandrel, characterized in that: The mandrel has grooves at both ends. The grooves are located on the outer wall of the mandrel and extend along the axial direction of the mandrel. One end of the groove is located at the end of the mandrel. The groove is a slot.

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