A disc-type motor stator core welding auxiliary device
By designing a welding table with inclined conical surface and small ring protrusions, combined with the pressing block and nail pressing structure, the problem of difficult stress deformation in traditional welding auxiliary equipment is solved, and the yield and production efficiency of the stator core are improved. , reduces production costs.
Patent Information
- Application Number
- CN201610687091.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2016-08-18
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2036-08-18
AI Technical Summary
Traditional disc motor stator core welding auxiliary equipment leads to low yield, long production cycle and high production costs, mainly because the welding stress deformation is difficult to effectively eliminate, resulting in low core deformation and low production efficiency.
Design a welding table with an inclined conical surface and a small ring projection, combining the pressing block and nail structure, offset welding stress by pre-deformation, reduce conflicts in deformation directions, simplify production processes, and cancel the vibration aging process to eliminate stress.
It improves the yield and production efficiency of the stator core, reduces equipment and site investment, significantly shortens the production cycle, improves manufacturing efficiency and reduces labor costs.
Smart Images
Figure CN107769489B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a welding auxiliary device, in particular to a welding auxiliary device for a disc-type motor stator core. Background Art
[0002] Welding, also known as fusion welding or melting welding, is a manufacturing process that uses heat, high temperature or high pressure to join metals or other thermoplastic materials such as plastics. Welding achieves the purpose of joining through the following three methods: (1) Fusion welding: Heating the workpieces to be joined to partially melt them to form a molten pool. The molten pool cools and solidifies before joining. If necessary, molten fillers can be added to assist; (2) Pressure welding: Pressure must be applied to the weld during the welding process; (3) Brazing: Using a metal material with a lower melting point than the parent material as the brazing material, the liquid brazing material is used to wet the parent material, fill the gap, and diffuse with the parent material to achieve a connection between the welded parts. These three welding methods cannot avoid deformation caused by thermal stress, so after welding, a portable stress relief machine is required to eliminate the stress caused by welding.
[0003] When traditional disc cores are made, the welding auxiliary equipment is plane-type, and then vibration or natural aging is used to eliminate welding stress. Such a manufacturing process has the following shortcomings: (1) The core yield rate is low. The connection between the disc motor stator core and the mounting plate adopts a welding process. The core body structure strength is insufficient. The core will be deformed under the influence of welding stress, and vibration aging can only eliminate about 30%-50% of the stress. The residual stress can still cause sufficient deformation, resulting in the scrapping of the stator core; (2) The core production cycle is long. The vibration aging stress elimination preparation takes more than 0.5 hours, and the core body vibration time takes about 2-3 hours to eliminate stress. Moreover, the smaller the size of the iron yoke part of the stator core, the greater the deformation, and the longer the vibration aging time. Therefore, when this process is used to make the core, the core production time is long, while the core welding time does not exceed 0.5 hours, and the time used for vibration aging stress elimination accounts for 80% of the entire core production process; (3) Increased equipment, site and labor investment. Using this process to manufacture stator cores requires investment in vibration aging equipment and process sites. During mass production, a large number of vibration aging equipment will need to be added, resulting in increased site and labor costs. Summary of the invention
[0004] The purpose of the present invention is to solve the above problems and provide a disc motor stator core welding auxiliary device with high yield, short production cycle and low production cost.
[0005] The purpose of the present invention is achieved through the following technical solutions:
[0006] A disc-type motor stator core welding auxiliary device consists of a welding platform, a plurality of pressing blocks and pressing pins. The pressing pins are arranged at both ends of the pressing blocks, and the pressing pins pass through the pressing blocks to connect with the welding platform. The welding platform is a disc structure with a through hole in the middle. The surface of the welding platform is a conical surface, and a small circular ring protrusion is arranged on the inner circumference of the conical surface.
[0007] The inclination angle of the conical surface is calculated as 20 / K, where K is the thickness of the iron yoke of the stator core.
[0008] The small circular ring protrusion is higher than the conical surface, and the ratio of the height of the small circular ring protrusion to the thickness of the conical surface is 1:1-1.5, and the ratio of the width of the small circular ring protrusion to the width of the conical surface is 1:3-5.
[0009] The outer side surface of the small circular ring protrusion is inclined outward along the axis of the conical surface, and the inclination angle is calculated as L / 10, where L is the height of the stator core.
[0010] The pressing blocks are rectangular and are evenly distributed in an array along the circumferential direction of the welding table.
[0011] One end of the pressing block is connected to the small circular protrusion through a pressing nail, and the other end is connected to the conical surface.
[0012] A plurality of stator core mounting plate positioning pins are also provided on the conical surface of the welding platform along the circumferential direction.
[0013] The welding platform is made of high carbon steel, and the surface roughness of the welding platform is less than 3.2.
[0014] When the present invention is used, anti-rust oil can be applied to the outer surface of the above components to ensure that when the core teeth interfere with the device, they can slide smoothly to the welding table by their own weight. When welding, the stator core is first placed on the welding table, the core mounting plate is placed on the core yoke, and then the pressing block is pressed on the stator core. After fastening with pressing nails, the stator core can be subjected to subsequent welding and other processes.
[0015] Since the stress and deformation directions during welding are all inclined outward in the form of an involute, the annular surface direction of the welding table is opposite to the thermal stress and deformation direction of the stator, and is designed to be inclined inward, so that the state of the stator before welding is opposite to the deformation direction of the traditional stator. After welding is completed, it is removed from the platform, and there is a rebound force. The size of the rebound is the size of the height difference of the annular surface, which can eliminate the stress effect.
[0016] Compared with the prior art, the present invention has the following advantages:
[0017] 1. No need to eliminate welding stress, and the welded stator core has a high yield rate. The present invention uses an inclined welding table, which causes the core to be pre-deformed under the pressure of the pressure block and the pressure pin. The stress generated by welding causes welding deformation of the core, which is opposite to the direction of the pre-deformation, just offsetting the stress generated during the welding process, so that the key dimensions of the core such as flatness and parallelism meet the design requirements, solves the deformation caused by welding, and greatly improves the qualified rate of the finished product;
[0018] 2. Reduce equipment and site investment, low production cost. Since there is no need for vibration aging to eliminate stress, the vibration aging stress elimination process in the traditional iron core manufacturing method is eliminated, and the equipment and site for stress elimination operation are no longer needed;
[0019] 3. Short production cycle and low labor cost. Traditional vibration aging takes a long time. This device eliminates the stress elimination operation process, greatly shortens the production cycle, doubles the manufacturing efficiency of the stator core, and reduces the number of operators, so the labor cost is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural schematic diagram of the welding station of the present invention;
[0021] Figure 2 for Figure 1 Middle AA section view;
[0022] Figure 3 It is a schematic diagram of the structure of the present invention in use state;
[0023] Figure 4 for Figure 3 Middle BB section view;
[0024] In the figure: 1-welding table; 2-pressing block; 3-pressing nail; 4-locating pin; 5-stator core; 6-core mounting plate; 7-conical surface; 8-small circular protrusion. DETAILED DESCRIPTION
[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.
[0026] Example 1
[0027] A disc motor stator core welding auxiliary device, such as Figure 1-4As shown, it is composed of a welding platform 1, a plurality of pressing blocks 2 and pressing pins 3. The pressing pins 3 are arranged at both ends of the pressing blocks 2. The pressing pins 3 pass through the pressing blocks 2 and are connected to the welding platform 1. The pressing blocks 2 are rectangular and are evenly distributed in an array along the circumferential direction of the welding platform 1. The welding platform 1 is a disc structure with a through hole in the middle. The surface of the welding platform 1 is a circular ring plane 7 inclined from the cone axis to the outside. A small circular ring protrusion 8 is arranged on the inner circumference of the cone surface 7. The pressing block 2 is connected to the small circular ring protrusion 8 through one end of the pressing pin 3 and to the cone surface 7 at the other end. A plurality of stator core mounting plate positioning pins 4 are also arranged on the cone surface of the welding platform 1 along the circumferential direction. The welding platform 1 is made of high carbon steel, and the surface roughness of the welding platform is less than 3.2.
[0028] The inclination angle of the conical surface 7 is calculated as 20 / K, where K is the thickness of the iron yoke of the stator core. The small annular protrusion 8 is higher than the conical surface 7, and the ratio of the height of the small annular protrusion 8 to the thickness of the conical surface is 1:1.5, which is 1:1 in this embodiment. The ratio of the width of the small annular protrusion to the width of the conical surface is 1:3-5, which is 1:4 in this embodiment. The outer side surface of the small annular protrusion 8 is inclined outward along the axis of the conical surface, and the inclination angle is calculated as L / 10, where L is the height of the stator core.
[0029] The disc-type stator core produced in this embodiment has a height of 45mm, a yoke thickness of 10mm, a flatness of 0.5mm, and a parallelism of 0.2mm. The inclination angle of the conical surface 7 is calculated to be 2° from the stator core size, and the inclination angle of the outer side surface of the small circular protrusion 8 along the vertical direction with the axis is 4.5°. When in use, anti-rust oil is applied to the outer surface of the above components to ensure that when the core teeth interfere with the device, it can slide smoothly to the welding table by its own weight. When welding, first place the stator core on the welding table, place the core mounting plate on the core yoke, and then press the pressing block on the stator core. After fastening with a pressing nail, the stator core can be subjected to subsequent welding and other processes. The core produced by this equipment has a flatness of 0.3 and a parallelism of 0.15.
[0030] According to calculations, the qualified rate of stator cores has increased from 30% to more than 95%, which has greatly improved the qualified rate of stators. The stator production cycle has been shortened from 2.5 hours to 0.5 hours, which greatly shortens the stator cycle and does not require vibration aging to eliminate stress, thus reducing the waste of raw materials, equipment, site and labor costs.
Claims
1. A disc motor stator core welding auxiliary device, consisting of a welding platform, a plurality of pressing blocks and pressing pins, wherein the pressing pins are arranged at both ends of the pressing blocks, and the pressing pins pass through the pressing blocks and are connected to the welding platform. It is characterized in that The welding platform is a disc structure with a through hole in the middle, the surface of the welding platform is a conical surface, and a small circular protrusion is arranged on the inner circumference of the conical surface; the pressing blocks are evenly distributed in an array along the circumferential direction of the welding platform; The conical surface is inclined inwardly, and the inclination angle of the conical surface is calculated as 20 / K, where K is the thickness of the iron yoke of the stator core, in mm.
2. A disc motor stator core welding auxiliary device according to claim 1, It is characterized in that The small circular ring protrusion is higher than the conical surface, and the ratio of the height of the small circular ring protrusion to the thickness of the conical surface is 1:1-1.5, and the ratio of the width of the small circular ring protrusion to the width of the conical surface is 1:3-5.
3. A disc motor stator core welding auxiliary device according to claim 2, It is characterized in that The outer side surface of the small circular ring protrusion is inclined outward along the axis of the conical surface, and the inclination angle is calculated as L / 10, where L is the height of the stator core, and the unit of L is mm.
4. A disc motor stator core welding auxiliary device according to claim 1, It is characterized in that The pressing block is rectangular.
5. The disc motor stator core welding auxiliary device according to claim 1, It is characterized in that One end of the pressing block is connected to the small circular protrusion through a pressing nail, and the other end is connected to the conical surface.
6. A disc-type motor stator core welding auxiliary device according to claim 1, It is characterized in that A plurality of stator core mounting plate positioning pins are also provided on the conical surface of the welding platform along the circumferential direction.