CN109822254B

CN109822254B - Special iron core installing and welding process

Info

Publication number: CN109822254B
Application number: CN201910303258.1A
Authority: CN
Inventors: 贺云龙; 姜玮琳; 董巍; 顾元昊
Original assignee: Harbin Electric Machinery Co Ltd
Current assignee: Harbin Electric Machinery Co Ltd
Priority date: 2019-04-16
Filing date: 2019-04-16
Publication date: 2021-01-15
Anticipated expiration: 2039-04-16
Also published as: CN109822254A

Abstract

The invention discloses a special iron core assembling and welding process, wherein iron cores are stacked in a horizontal assembling and pressing tool, the iron cores are erected together with the assembling and pressing tool, the iron cores are welded under the state of rated pressing force, and the iron cores are cooled to room temperature under the state of keeping the rated pressing force. The process method provided by the invention improves the heat conduction efficiency during the welding of the punching sheets, reduces the volatilization of a paint film during the welding of the punching sheets, controls the deformation of the iron core after the welding, and ensures the inter-sheet pressure of the iron core punching sheets and the whole size of the iron core.

Description

Special iron core installing and welding process

The technical field is as follows:

the invention discloses a special iron core assembling and welding process method.

Background art:

in the linear motor stator module, an iron core comprises an iron core punching sheet, an iron core back plate and an iron core pressing plate. The iron core punching sheet is made of a 0.5mm rectangular silicon steel sheet, and a long edge on one side is provided with false teeth. The iron core back plate is processed by nonmagnetic rigid materials, and the side view is L-shaped. The iron core punching sheets are stacked on the iron core back plate along the long edge, the iron core is clamped tightly by the iron core pressing plate and the short edge of the back plate, and the iron core punching sheets, the iron core back plate and the iron core pressing plate are welded into a whole in a welding mode. The specific implementation of this design scheme faces the following problems: 1. the width-to-height ratio of the stamped sheet is close to 24 times, and local looseness is easy to occur; 2. the height of the punching sheet is only 25mm, the insulating paint film volatilizes under the influence of welding heat, the volatilization range is 15-20mm of outward diffusion in the range of a molten pool, and the insulating paint film almost loses efficacy; 3. after welding, the iron core is seriously deformed, and the pressure between punching sheets cannot be ensured. There is a need for a more reliable and accurate process that addresses the above-mentioned problems.

The invention content is as follows:

the invention provides a reliable, accurate and convenient iron core assembling and welding process method. The technical scheme is as follows:

1) assembling tools: fixing the well-shaped frame (2) at the bottom of the outer frame (1);

2) stacking iron cores: placing the iron core back plate (3) into the outer frame (1), supporting the iron core back plate (3) by using the well-shaped frame (2), and stacking iron core punching sheets (4) on the iron core back plate (3); knocking and shaping the protruded piece of the iron core punching sheet (4) in the height direction on the upper surface of the outer frame (1) by using a mallet;

3) preparation before iron core compression: after the iron core punching sheets (4) are stacked, the iron core clamping plates (5) are placed, the jacks (6) are placed between the outer frame (1) and the iron core clamping plates (5), and the sub-pressing plates (7) are padded between the jacks (6) and the iron core clamping plates (5);

4) iron core prepressing: starting a jack (6), applying pressure between the outer frame (1) and the pressure dividing plate (7), and applying rated pressing force to the iron core back plate (3), the iron core punching sheet (4) and the iron core pressure dividing plate through the other end of the outer frame (1) and the pressure dividing plate (7);

5) adjusting the size of the iron core: measuring and recording the stacking length of the iron core punching sheets (4) under rated pressure, releasing the pressure of the jack (6), and increasing or decreasing a certain number of iron core punching sheets (4) according to the measurement result;

6) iron core pressing and erecting: restarting the jack (6), pressing the iron core back plate (3), the iron core punching sheet (4) and the iron core pressing plate through the outer frame (1) and the pressure dividing plate (7), rechecking the length and the size of the iron core, and erecting the iron core, the iron core punching sheet (4), the iron core back plate (3) and the iron core pressing plate together with the outer frame (1), the # -shaped frame (2), the jack (6) and the pressure dividing plate (7)) after meeting the drawing requirements;

7) iron core welding: welding an iron core punching sheet (4), an iron core back plate (3) and an iron core clamping plate (5) at one side of the well-shaped frame (2) to form an integral iron core;

8) cooling after welding: and after the iron core is cooled to room temperature, releasing the pressure of the jack (6), and taking out the iron core from the outer frame (1).

The technical effects are as follows:

as described in the background, the following problems occur in the design of linear motors during the process verification stage: 1. the width-to-height ratio of the stamped sheet is close to 24 times, and local looseness is easy to occur; 2. the height of the punching sheet is only 25mm, the insulating paint film volatilizes under the influence of welding heat, the volatilization range is 15-20mm of outward diffusion in the range of a molten pool, and the insulating paint film almost loses efficacy; 3. after welding, the iron core is seriously deformed, and the pressure between punching sheets cannot be ensured.

By applying the invention, two jacks driven by the same pump station exert uniform force, and the pressure is acted on the iron core through the pressure-separating plate, so that the stress of the iron core punching sheet is more uniform, and the condition of local looseness can not occur; by applying the invention, the iron core is welded under the rated pressing force state, the heat conduction efficiency between the punching sheets is improved, the volatilization range of the paint film is reduced from 15-20mm of outward diffusion in the range of a molten pool to 1-2mm of outward diffusion in the range of the molten pool, and the paint film is effectively protected; by applying the invention, the iron core is cooled under rated pressure, welding deformation is more effectively controlled, the size of the iron core is ensured, and the inter-sheet pressure is ensured to meet the requirement.

Description of the drawings:

FIG. 1: the iron core is stacked in the horizontal tool.

FIG. 2: and (5) welding the iron core after the iron core is erected.

The specific implementation mode is as follows:

1) assembling tools: combining the well-shaped frame 2 at the bottom of the outer frame 1;

2) stacking iron cores: placing the iron core back plate 3 into the outer frame 1, supporting the iron core back plate 3 by using the well-shaped frame 2, and stacking iron core punching sheets 4 on the iron core back plate 3; the width dimension of the outer frame 1 is the same as that of the iron core stamped steel 4, and the width direction of the iron core stamped steel 4 is limited in the stacking process; the iron core back plate 3 has a limiting effect on one side of the iron core stamped sheet 4 in the height direction, and a mallet is used for knocking and shaping the protruded sheet of the iron core stamped sheet 4 in the height direction on the upper surface of the outer frame 1;

3) preparation before iron core compression: as shown in fig. 1, after the iron core laminations 4 are stacked, the iron core clamping plates 5 are placed, the jack 6 is placed between the outer frame 1 and the iron core clamping plates 5, and the pressure dividing plate 7 is padded between the jack 6 and the iron core clamping plates 5;

4) iron core prepressing: starting the jack 6, applying pressure between the outer frame 1 and the pressure dividing plate 7, and applying rated pressing force to the iron core back plate 3, the iron core punching sheet 4 and the iron core pressing plate through the other end of the outer frame 1 and the pressure dividing plate 7;

5) adjusting the size of the iron core: measuring and recording the stacking length of the iron core punching sheets 4 under rated pressure, releasing the pressure of a jack 6, and increasing or decreasing a certain number of iron core punching sheets 4 according to the measurement result;

6) iron core pressing and erecting: restarting the jack 6, applying rated pressing force to the iron core back plate 3, the iron core punching plate 4 and the iron core pressing plate, rechecking the length and the size of the iron core, and standing the iron core (comprising the iron core punching plate 4, the iron core back plate 3 and the iron core pressing plate) and the tool (comprising the outer frame 1, the # -shaped frame 2, the jack 6 and the pressure dividing plate 7) under the working condition of keeping the pressure according with the drawing requirement, as shown in fig. 2;

7) iron core welding: under the working condition of keeping pressure, welding an iron core punching sheet 4, an iron core back plate 3 and an iron core clamping plate 5 at one side of the derrick 2 to form an integral iron core;

8) cooling after welding: and releasing the pressure of the jack 6 after the iron core is cooled to room temperature under the working condition of keeping the pressure, and taking out the iron core from the outer frame 1.

Claims

1. A special iron core welding process is characterized in that: the method comprises the following steps:

6) iron core pressing and erecting: restarting the jack (6), pressing the iron core back plate (3), the iron core punching sheet (4) and the iron core pressing plate tightly through the outer frame (1) and the pressure dividing plate (7), rechecking the length and the size of the iron core, and standing the iron core punching sheet (4), the iron core back plate (3) and the iron core pressing plate together with the outer frame (1), the cross frame (2), the jack (6) and the pressure dividing plate (7) after meeting the drawing requirements;