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

A current detection and electric upsetting technology, applied in heating/cooling equipment, forging/pressing/hammer devices, metal processing equipment, etc., can solve the problem of unreliability, inconvenient use, and inability to effectively detect whether the workpiece is in contact with the anvil, etc. problem, to achieve the effect of high reliability and convenient use

CN102107257AInactive Publication Date: 2011-06-29HUNAN TYEN MACHINERY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-06-29
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment 2

[0025] see figure 2, a device that uses current detection to determine the starting point of electric heating upsetting, including heating transformer B, AC contactors KM1, KM2, thyristor voltage regulator SGT, impedance relays KI1, KI2, fuses FU1, FU2; heating transformer B The input terminal is connected to the mains, and one output terminal of the heating transformer B and the output terminal of the thyristor voltage regulator SGT pass through a pair of normally open contacts KM1-1 connected to the terminal L1 on the anvil and the wiring on the clamping block Column L2, the input end of the thyristor voltage regulator SGT is connected to the other output end of the heating transformer B; one end of the line package of the impedance relay KI1 and KI2 connected in series is connected to an output end of the heating transformer B, and the end of the impedance relay KI1 and KI2 The other end of the wire package connected in series and the output end of the thyristor voltage re...