Shielding Sleeve Spin Drawing for Precise Pump Motor Fit
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Solution Overview
Problem
Existing methods for forming shielding sleeves for circulating pumps are complex, involve multiple steps, and struggle to achieve the required accuracy and brightness, leading to issues such as motor power reduction and rotor sticking.
Innovation Solution
A forming method that includes blanking a stainless-steel plate, coating with drawing oil, undergoing two rounds of drawing, and spin drawing to produce a shielding sleeve with precise dimensions and surface roughness, eliminating the need for annealing and reducing the number of drawing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple drawing and annealing processes are used to brighten the surface and reduce impurities, then the brightness and surface quality improve, but the process complexity increases and size accuracy becomes difficult to control
Solution Approach 1:
The invention extracts and eliminates the annealing process from the traditional multi-step forming process. By using a single-stage drawing process with optimized drawing oil and process parameters, the patent achieves both surface brightness and dimensional accuracy without requiring intermediate annealing steps, thus simplifying the overall process while maintaining quality.
Solution Approach 2:
The invention changes the process parameters by using specific drawing oil formulations and controlling the drawing process parameters (such as drawing ratio, speed, and temperature) to achieve surface brightness equivalent to or better than traditional multi-step processes. This parameter optimization allows single-stage drawing to replace multiple drawing and annealing cycles.
2Reliability
If multiple drawing and annealing processes are used to reduce impurity accumulation, then the prevention of rotor sticking improves, but the manufacturing time and energy consumption increase
Solution Approach 1:
The invention extracts and removes the annealing process from the traditional forming sequence. By implementing a single-stage drawing process with optimized lubrication and surface treatment, the patent achieves sufficient surface quality to prevent rotor sticking without the time-consuming intermediate annealing step, thereby reducing total manufacturing time while maintaining reliability.
Solution Approach 2:
The invention skips the intermediate annealing step that is traditionally required between multiple drawing operations. By using advanced drawing oil and process control in a single continuous drawing operation, the patent rushes through the forming process efficiently while still achieving the necessary surface brightness and impurity reduction to prevent rotor sticking.
3Illumination intensity
If traditional multi-step drawing is used, then the surface brightness can be improved, but the size accuracy of the formed shielding sleeve is difficult to control
Solution Approach 1:
The invention changes the process parameters by using optimized drawing oil formulations and precisely controlled drawing parameters (drawing ratio, speed, temperature, and lubrication conditions) in a single-stage process. This parameter optimization simultaneously achieves surface brightness and dimensional accuracy, eliminating the need for intermediate annealing that traditionally caused size control issues.
Solution Approach 2:
The invention replaces the mechanical annealing process with a chemically-enhanced drawing process using specialized drawing oil. This substitution allows the drawing process itself to achieve both surface brightness and dimensional stability without requiring subsequent thermal treatment, thereby improving size control while maintaining surface quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method simplifies the process, improves forming efficiency, achieves high accuracy in size and surface finish, and enhances the strength and durability of the shielding sleeve, preventing rotor sticking and improving motor efficiency.
Implementation Method 1
using a hydraulic press to stretch the oil-coated rounded plate twice to form a drawn piece
Implementation Method 2
using a spinning machine to spin draw the drawn piece to form a spin-drawn piece, a height of which is 64.9mm-65.1mm, and a roughness of an inner wall or an outer wall of which is 0.004μm-0.006μm
Implementation Method 3
coating the surface of the rounded plate with a drawing oil
Data Source
Figure 1
Figure 2a~2f
AI summary
The present invention relates to a forming method of a shielding sleeve, including the following steps: blanking: cutting a stainless steel plate into a rounded plate, a thickness of which is 0.97mm-lmm; coating oil: coating a surface of the rounded plate with a drawing oil; two rounds of drawing: using a hydraulic press to draw the oil-coated rounded plate twice to form a drawn piece, a height of which is 28mm-28.5mm; spin drawing: using a spinning machine to spin draw the drawn piece to form a spin-drawn piece, wherein, a height of the spin-drawn piece is 64.9mm-65.1mm, and a roughness of an inner wall or an outer wall of the spin-drawn piece is 0.004µm-0.006µm. Through two rounds of drawing and spin drawing, the process is simplified, the forming efficiency is improved, the roughness of the inner and outer walls of the shielding sleeve is reduced, the accumulation of scale and impurities is reduced, rusting is also delayed, the rotor is prevented from getting stuck, the efficiency of the motor is improved, and the service life of the circulation pump is extended. The spinning machine can control the accuracy of the forming size, making the inner and outer diameters of the formed shielding sleeve more accurate, and making the shielding sleeve better match with the stator and rotor.