Method and device for determining heating start point of electric upsetting through current detection

Abstract

The invention discloses a method for determining a heating start point of electric upsetting through current detection. The method comprises the following steps of: previously applying low voltage between a workpiece and an anvil; and judging whether the workpiece is contacted with the anvil or not by detecting current during contact of the workpiece and the anvil so as to determine the heating start point of the electric upsetting. The invention has the advantages that: 1, the method is more convenient to use and has higher reliability compared with a pressure detection method and a time judgment method; 2, since the current cannot be detected and then the operation is stopped once poor contact occurs, whether a contact condition between the anvil and an anvil seat is good can be judged; and 3, the workpiece length from the anvil to a clamping block can be controlled to be proper at the beginning of heating so as to avoid local overheating. The invention also discloses a device for implementing the method.

Description

Technical field: [0001] The invention relates to the field of electrothermal upsetting technology and electrical technology, and is a method and device for detecting when an electrothermal upsetting workpiece contacts an anvil to determine whether heating can start by using current detection to determine the starting point of electrothermal upsetting heating. Background technique: [0002] Traditionally, the initial heating voltage during electrothermal upsetting is relatively high. If this voltage is applied before the workpiece touches the anvil, a large current will be generated when the workpiece contacts the anvil. At this time, the workpiece and the anvil The contact area of ​​the anvil is small, that is, the contact resistance is small. Due to the large voltage, it is easy to form a large current and generate a large spark, which has a significant impact on the processing quality of the workpiece and the life of the anvil. Therefore, it is necessary to apply the initi...

AI Technical Summary

Problems solved by technology

The first two basic principles are the same, both belong to the pressure detection method. The first pressure detection method is inconvenient to use because it needs to be adjusted according to different working pressures. Due to the influence of the clamping force and the malfunction of the pressure relay, the detection often fails and is unreliable.

The second is that it is often adjusted, which is inconvenient to use

But the device still can't effectively detect whether the workpiece touches the anvil

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