Control method of pass weld seam of skin pass machine

Abstract

The invention provides a control method for passing the weld seam of a temper machine, which adopts the method of increasing the bending force to be greater than the rolling force, so that the lower work roll of the temper machine is automatically lowered, so as to open the weld seam for the strip steel to pass through the leveling machine. The roll gap of the whole machine includes the following steps: Step 1: The unit speeds down to the over-weld speed; Step 2: The rolling force drops to the set value of the over-weld rolling force; Step 3: The bending force increases to the over-weld speed. The setting value of the welding seam bending force; Step 4: After the welding seam passes through the tempering machine, the rolling force and bending force return to the setting value of the initial rolling, and then the unit speeds up to the initial working speed; The invention has accurate calculation of the time point of rolling force and roll bending force change. The invention optimizes the welding seam pattern, passes the welding seam in the simplest steps, reduces the waste length of the strip steel passing the welding seam, and improves the yield of the strip steel.

Description

technical field [0001] The invention relates to the field of metallurgical automation, in particular to a control method for passing a weld of a temper machine. Background technique [0002] The process flow before and after the cold acid tempering machine is as follows: figure 1 As shown, the strip passes through a four-roll tension roll and then enters the tempering machine, and finally enters a two-roll tension roll to leave the level machine. There are tensiometers at the front and rear of the tempering machine to measure the front and rear tension. Leveling machine mechanism such as image 3 As shown, it is mainly composed of 2 work rolls, 2 push cylinders and roll bending cylinders. Since the weld seam directly pressing the strip will damage the roll, when the weld seam passes through the skin pass mill, the roll must open a certain roll seam, and then close the roll seam after the weld seam passes. This method is called a slightly open weld seam. [0003] When the...

AI Technical Summary

Problems solved by technology

Affect the yield of the strip steel, cause a certain amount of waste over the weld, and affect the production rhythm of the unit (the furnace section needs to slow down at high speed)

Images