Near-Isothermal Hot Spinning With Induction Heat Complementing
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Solution Overview
Problem
Existing hot spin forming methods for difficult-to-deform alloy materials face challenges in accurately regulating and controlling temperature uniformity, leading to instability, wrinkling, and poor forming quality due to large temperature fluctuations and low heating efficiency.
Innovation Solution
A near-isothermal hot spin forming method that includes preheating a blank to a spin preheating temperature, clamping it on a workbench with a heat complementing system, and using real-time temperature monitoring to maintain a ±20°C temperature fluctuation range during spinning by actively heating and temperature complementing, ensuring the blank reaches and maintains the required pre-spinning temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If flame heating method is used for hot spin forming, then heating efficiency is high and temperature range is large, but temperature fluctuation is large and heating accuracy is low
Solution Approach 1:
The patent replaces the mechanical flame heating system with an induction heating system that uses electromagnetic fields to heat the workpiece. This substitution eliminates the temperature fluctuation and low accuracy issues of flame heating while maintaining high heating efficiency, as induction heating provides precise temperature control through electrical parameter adjustment.
Solution Approach 2:
The patent implements a feedback control system where temperature sensors continuously monitor the workpiece temperature and feed this information back to the induction heating controller. This closed-loop feedback mechanism automatically adjusts heating parameters to maintain precise temperature control, resolving the temperature accuracy problem while preserving heating efficiency.
2Area of stationary object
If flame heating method is used for hot spin forming, then heating range is large, but temperature uniformity is poor
Solution Approach 1:
The patent divides the heating process into multiple independent induction heating zones along the workpiece length, each with its own temperature control. This segmentation allows different regions to be heated uniformly and independently, eliminating the temperature uniformity problems caused by the large-area but uneven flame heating while maintaining comprehensive heating coverage.
Solution Approach 2:
The patent applies local quality control by enabling different temperature settings for different segments of the workpiece based on their specific forming requirements. Each localized heating zone can be optimized independently, ensuring uniform temperature distribution across the entire heating area while accommodating varying thermal requirements of different regions.
3Reliability
If heating time is increased to ensure normal processing, then temperature stability improves, but productivity decreases
Solution Approach 1:
The patent implements continuous induction heating that operates throughout the entire forming process, maintaining constant temperature stability without requiring extended heating periods. The continuous electromagnetic heating action ensures temperature consistency is achieved rapidly and maintained efficiently, eliminating the need for prolonged heating times that would reduce productivity.
Solution Approach 2:
The patent utilizes the ability to rapidly change induction heating parameters (power, frequency, duty cycle) to achieve optimal temperature stability in minimal time. By dynamically adjusting electrical parameters based on real-time temperature feedback, the system achieves reliable temperature control much faster than flame heating, thereby maintaining high productivity while ensuring temperature stability.
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
This method improves deformation capacity, reduces deformation resistance, enhances forming quality and efficiency, and ensures consistent product consistency by maintaining precise temperature control, suitable for both difficult-to-deform and non-difficult-to-deform metals.
Implementation Method 1
then the blank is heated by a follow-up induction heating coil to a spinning temperature
Implementation Method 2
the temperature is monitored by an infrared thermal imager
Implementation Method 3
the flame gun heats the spinning blank
Data Source
AI summary
A near-isothermal hot spin forming method and a heat complementing method for a metal workpiece are provided. The forming method comprises: transferring and clamping a blank heated to a spin preheating temperature on a workbench, wherein the blank is located in an effective heat complementing zone provided by a heat complementing system; measuring a temperature of the blank to judge whether the temperature of the blank satisfies a pre-spinning temperature to determine whether the blank waits for temperature complement in the heat complementing system; and completing the near-isothermal hot spinning process in the heat complementing system according to the preset spinning program. During the spinning process, the heat complementing system continuously supplements the temperature of the blank and monitors the spinning temperature in real time to ensure that the fluctuation range of the spinning temperature does not exceed ±20° C. from the beginning to the end of the spinning deformation.