JPS5844950A - Continuous casting - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for operating a horizontal continuous casting mold, @1: a method for monitoring a withdrawal cycle for transferring ingots from a horizontal continuous casting mold.

It is omniscient that in continuous casting II + * there is at least one pair of drawer rolls (= located at the horizontal pour and knee totsmo outlet ends. Use - is drawer row J&T) at least one or each separately Periodically 6:a transfer the ingot from the mold. During each complete cycle C: has a pull period and a push period. Drawer seals can be driven by individual electric mats: x or gear train 1 = base motor 6: therefore ■ @, 1 major other i: hydraulic motor mII or expansion train motor 6: (;12 drawer row A (: a1
You can also match them.

The present invention is a method of operating a horizontal continuous casting mold with a horizontal mold and at least one pair of drawer rolls located in the first stream (two positions) at the exit end of the seven molds; -fK field periodically for one or each other,
Cast Wii: form a"ann beingottsu-shi, seven, o*
s complete jJ! Consider the withdrawal period i% rest period and push period, monitor the withdrawal cycle continuously, 1iIn large information is supplied to the combiator 4: during the decay of the withdrawal cycle 4:, the computer is abnormal If a situation like mt is detected - 2. Take corrective action or issue an alarm.
U C: Name 1 U (: Do.

Monitor one or more of the following parameters: (a)
11 degree sensing 1i1) for hydraulic motors, the withdrawal force using a pressure transducer, or feedback from the controller of an electric motor, and (c) using a speed or position transducer. The movement of the pull-out roll and ingot will now be explained in more detail.

Regarding Figure II1, at least one pair of drawer rows (h) located at the outlet end of a horizontal continuous casting mold are heated for each complete cycle, with a period of pulling, a period of pushing, and a certain rest period. As in, one round periodic C: rotates. The rest period is between the pull period and the push period.

181v! In J, for each Yaiguru, the period tl
.

Next, we can see that there is a rest period t2 and then a pressing period t. This next i: is the next Yaikur's small 11 (:
to be continued.

As shown in Figure 142 (12), under normal operating conditions, the speed profile of the ingot during the formation stage is tr +
is at point B, and the rotational direction C is:
There are some parts that are different. This speed B is.

II CD 4: Same amount along and upper mouth speed (= rapid (
: Before deceleration - 1nn - : lI1 interval t 1 - t, -
* Maintain for a period of time.

Next &: The motor is stationary during the arbitrary time IR continues a-t, but during the deceleration period of 8, the inertial system 4: Preventing overshading due to 11! Gatoranru. At the beginning of t, C: 4-11 is reversed, and (n is twice on the constant negative side, it is 1. do.

The operation of the Vinita is controlled using a feedback loop that includes any one or a combination of the above-mentioned large casting parameters. − shall annihilate or suspend Pro-Sananu;
automatic control 1 (= the drawer can be re-drawn and the small wax/casting work is reduced);
It depends on how you use it.

Various deformation diagrams are used to measure abnormal conditions of mold temperature. One of the diagrams of cn et al. will be explained using Figure 14. ζ
At ζ, the temperature measuring device P is pulled out with a large amount of drawing stroke L1.
Opening 6 in the mold wall adjacent to that part of the length of the mold from the inlet that is within a length of . This device measures the temperature of the mold during the drawer cycle when a solidified shell begins to form;
ζ1 can be used to indicate the fragility of shell growth in the first solidification region of the mold, since it acts as an increasing thermal barrier.

Figure 3: Shows the basic characteristics that are expected to be measured. Since the withdrawal process is periodic and therefore unstable, the temperature profile generated is oscillating or sinusoidal and periodic. Deviations between points ζ1 is large enough to solidify the material in the mold and ensure that there is no !i'll. This is a typical abnormal state of temperature, and the first method is to measure it with a temperature controller.That is, to measure the deviation from the average of many previous consistent temperatures. Do 1.

The deviation is at an unacceptable level (acceleration is taken when performing double sequences).

Ql) Select and measure the peak temperature of %Yaikuru (:$P), and calculate the deviation from the predetermined maximum permissible temperature low 1 speed (: 1 will rot: ζ1 is WaS
This is a measure of the speed of award recognition.

Testing the reversal of hot water temperature between each cycle (: Therefore, 5
Now.

1%/) Compare the average temperature between 'g and h with the predetermined temperature limit f'I 4: Do one thing ・M many OV
Comparing the temperature of the temperature change of the cycle with a predetermined r+light-permissive limit is carried out as C21.

The above O check was carried out using the temperature measuring device P81.
However, as a modification, Figure 14C: also shows 1C: A number of temperature measuring devices are provided inside the mold (along the entire length C: of the mold, so that the length of the mold C2 is the temperature profile h6
:Based on <ims. Under normal conditions), the hottest position in the road mold is the first stage! ! Region 4: Will be the adjacent entrance end. However, in abnormal conditions) the highest is 16! ! The position of C: moves diagonally along the mold wall (: towards the mold outlet). Monitor the temperature between two points using two temperature measurements ii*p and S. Then, near the inlet end of the PFi mold (C: Yes, downstream beyond the long hair L1 of the S drawer stroke (: Yes. Under normal casting conditions, %Po1
1 degree is higher than the soim degree, because P(: the thickness of the stone shell 1t When passing through, the temperature suddenly rises when the molten metal comes into contact with the mold wall.This can be used to change the mining conditions.

The drawing process is periodic: the property of drawing and resting is large, the thermocouple (: therefore, the temperature measured by sr is the average
The amplitude and/or frequency i! that will oscillate vs. The number of l is not necessarily constant and changes depending on the following:

(I) Drawer cum body slam (1) Characteristics of at-degree sensor f- (tM) Position of s1-degree sensor drop (1v) Casting material (V) Casting II design (Vj) Characteristics of cast metal 1m/property drawer a - A I One or several hydraulic motors - Tashi: Therefore 8 I @ When casting, temperature measurement of the mold C: As an alternative #i7rM4 = In addition, the pressure of the hydraulic motor can be monitored. Water motor section: 1 develops torque inlet and outlet holes (: ゎ6 pressure (:: proportional. If molten metal comes out from the skin of the ingot during casting, then the ingot's shell 1 comes out ζ: Changes in the resistance to the fist ζn will result in a consistent withdrawal tIIm (6=necessary low torque), which will result in a pressure conversion! Change in low F characteristic C: There will be 8n reflection.

Ingot (: 1 means the distance of power 11 is indicated by the curves A, B, and C of the part drawn by the cycle.

It is indicated by the area of DJ. Thus, a theoretical long name can be measured in one cycle with four known sets of each element. Take this value and multiply it by the sum of the two Th planes ζ.

A position or velocity transducer C:1 is used to determine the actual length of the inlet from the mold and the measuring field. A difference exceeding a predetermined limit can be considered as an indication of abnormal casting conditions, and ζn can be used as a reference index in addition to (or in place of) the above-mentioned abnormality detection condition.

If the computer indicates that an abnormal condition has occurred using one of the above methods.

ζn is a part or all of the skin of the ingot that has been solidified.

Only in this state can the tear be recovered if the eye remains in the mold, and 7 and ζn is a period of one cycle. .

ζn 1: The longer the molten metal is, the longer the molten metal will flow within 0 and the skin cracks will melt, thus solidifying and producing a thicker skin that will withstand tearing during subsequent withdrawals. can be promoted. If an abnormal condition occurs and continues for more than 11 predetermined numbers, the turtle, 1 and/or Lyu period will be 1 of 7" and 11 of the 11 predetermined functions or some predetermined Fixed six C: No. 1: Increase.

If the abnormal condition continues to be 1; the predetermined n large number continues, the ga of f1, t2 and/or t is increased C: same as 6
It is clear that it is preferable to slow down the withdrawal process even to the point where ζn is stopped altogether, since the operation has to be repeated by one in two. That is ζf1 (:
! Reingot g: This is because the occurrence of 8-sided defects is avoided. However, if the abnormal condition still persists after the %t2 and/or t5 period increases by the scheduled number, the withdrawal process has to be stopped, ζ, 1t1 is automatically &: omitted. It is possible to manually make a part of the 1m drawer of a large Fi-t by issuing a warning. When the process is stopped by the computer @gJ, The process can be started again automatically after opening the same amount as the predetermined fl.
Only N=z will start it again 1mm! I can.

[Brief explanation of the drawing]

Figure 21 shows the speed profile of the ingot when it is pulled out from the mold. FIG. 4 shows the relationship between the temperature and the % tIi of the mold at 11 degrees; FIG. t work...drawing time, p, s...temperature measurement gathering, t2
...rest time, t, ...distance between pushing axes. Patent Applicant DAVY LOY RINTED! I1
Figure 2

Claims (1)

[Claims] (1) One stream 6 of the outlet end of the mold with horizontal otstii:
Method of operating a horizontal continuous casting machine having at least one pair of drawer rolls located:
= Formed f'1 large iffing, divided by seven - each complete cycle is pulled, rested (including the period of pushing, 1 C Niji,
Continuously monitor and monitor sn* information on computer
2 If the combiator detects an abnormality and it is severe, 4: Takes corrective action.
: i! How to do it. (!I) The method according to claim 2 of continuously monitoring the temperature of the mold during the drawing process. (4) During the drawing step, the long hairs of the ingot drawn out from the mold are continuously monitored.
1. The method of the princess. asIi4 The action of correcting the normal state is to increase the length of the pulling period'g(:tj and the length of the pushing and/or resting period -1) Patent n'$ l111 Boxes 1 to 4
Item number 4: Method of recording. +6) Take the corrective action and if the abnormal condition remains '4', then V
l, time of pull period 01k 8 s: stab and push and/
Or increase the length of the rest period 011, and if there is no abnormal condition to correct, stop the drawer A. The method according to Smm No. 6 of the patent claim (7) The casting degree is maximum The drawer of the loaf ellipse (: there is a casting! 10 population of the seven parts of the mold 1: of the adjacent mold - measured by n
7tm as claimed in claim 2; (8) the mold is measured at one point near the entrance of the mold and beyond the maximum withdrawal stroke length; Method: (Develops one or each separate drive wheel snow ζ: 1) Dress TM! The method according to patent claim O@81/43.鵠 Horizontal casting 1B = at least one pair of drawer rolls located in the first stream of the exit of the mold: q of drawer rolls! At least one of the pairs is rotated periodically to transfer the formed ingot into the mold. Receiving and processing 1 sea urchin tone! 16n,
A computer that takes corrective action or issues an alarm if it detects abnormal conditions! Continuous casting mold with.