Control method and device for controlling cooling process in bar production line

A technology for controlling cooling and control methods, applied in manufacturing tools, heat treatment process control, heat treatment equipment, etc., can solve problems such as failure to provide automatic settings

Active Publication Date: 2015-06-03
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a control method for controlling the cooling process of a bar production line, so as to solve the pr

Method used

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  • Control method and device for controlling cooling process in bar production line
  • Control method and device for controlling cooling process in bar production line
  • Control method and device for controlling cooling process in bar production line

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Embodiment 1

[0022] Such as figure 1 Shown is a flow chart of a control method for a controlled cooling process of a bar production line provided by an embodiment of the present invention. The method of this embodiment is applicable to various controlled cooling processes of a bar production line, especially for surface quenching and cooling of ribbed steel bars. Self-tempering process parameter setting, including: water flow size and quenching time. Depend on figure 1 It can be seen that an embodiment of a control method for a rod controlled cooling process provided by the present invention,

[0023] In step 201, according to the steel type M and the corresponding characteristics of the continuous cooling transformation curve, the critical phase transformation temperature and the critical cooling rate for forming martensite in the rolled piece are determined.

[0024] Such as Figure 4 As shown, it is a typical continuous cooling transformation curve characteristic (Continuous Cooling ...

Embodiment 2

[0059] The embodiment of the present invention also provides a control device for controlling the cooling process of the bar production line, which is used for the operation control system, and the control system is used to realize the method steps of the first embodiment above, as image 3 As shown, the device includes an input module 1, a display module 4, a processor 2 and a storage module 3, specifically:

[0060] The input module 1 is configured to receive rolling process parameters input by users.

[0061] The processor 2 is used to determine the critical phase transformation temperature and the critical cooling rate at which martensite is produced on the surface of the rolled piece according to the steel type M and the corresponding continuous cooling transformation curve characteristics; according to the length value L1 of the water tank and the The rolling speed V calculates the quenching time t1, and through the quenching time t1 and the cooling water temperature Tw,...

Embodiment 3

[0068] This embodiment is based on the execution steps of the main body in Embodiment 1, and combines one or more extended implementation methods introduced in Embodiment 1 to provide a flow chart of a relatively comprehensive control method for controlling the cooling process of the bar production line ,Such as Image 6 As shown, it specifically includes the following steps:

[0069] In step 301, start the control system software installed in the device in the second embodiment.

[0070] In step 302, the operator inputs the rolling process parameters through the display module 4 of the device, including: controlled cold-rolled piece specification D, rolling speed V, cooling water temperature Tw, quenching water tank length L1, steel type M, and so on.

[0071] In step 303, according to the steel type M and the corresponding characteristics of the continuous cooling transformation curve, the critical phase transformation temperature and the critical cooling rate for forming m...

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Abstract

The invention is suitable for the field of bar online thermal treatment and discloses a control method for controlling cooling process in a bar production line. The method comprises the following steps: determining a critical phase-transition temperature and a critical cooling speed of a martensite generated on the surface of the rolled piece according to the steel type M and the corresponding continuous cooling transformation curve; calculating the corresponding minimum water flow Qmin when reaching the critical phase-transition temperature and the critical cooling speed; determining a water flow initial value Q according to the Qmin; according to the water flow initial value Q, calculating the thickness of the martensite generated after finishing the quenching stage through the finite-discrete scheme to obtain the required martensite thickness; and calculating to obtain the finial water flow zone Qm which satisfies the martensite thickness. By adopting the method, the technological parameters of the controlling cooling process can be automatically deduced; compared with the mode of copying or referring to the operated production line in the prior art, the method is more effective and accurate.

Description

technical field [0001] The invention belongs to the field of on-line heat treatment of rods, in particular to a control method and device for controlling the cooling process of a rod production line. Background technique [0002] The controlled cooling process is to control the structure and performance of steel by controlling the difference in cooling rate after rolling. By controlling cooling after rolling, the strength of the steel can be further improved without reducing the toughness of the rolled piece, and the cooling time of the hot-rolled steel can be shortened. [0003] Depending on the type of steel, the strength and toughness of controlled cooling steel depends on the rolling conditions and cooling conditions. Before the implementation of the controlled cooling process, the microstructure of the steel is determined by the parameters of the controlled rolling process. Controlling the cooling conditions has an impact on the austenite state after thermal deformati...

Claims

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Application Information

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IPC IPC(8): C21D11/00
Inventor 骆艳萍
Owner WISDRI ENG & RES INC LTD
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