JPS62144805A - Method for charging succeeding material in cold pilger rolling mill - Google Patents

Abstract

PURPOSE:To prevent the dimensional fluctuation of a product by advancing a pusher rod by the distance satisfying the specific equation by a main driving mechanism then operating an auxiliary driving mechanism to advance the pusher rod by the distance satisfying the prescribed equation. CONSTITUTION:A pusher carriage 13 of the main driving mechanism which travels on a guide way 31 under being connected by a connecting jig to a wire rope 16 is provided and an air cylinder 28 is disposed as the auxiliary driving mechanism 27 therein. The push rod 14 is connected to a piston 29. The auxiliary driving mechanism 27 is preset to satisfy equation I. The rod 14 is advanced by the distance satisfying equation II by the pusher carriage 13, then the rod is ejected by the auxiliary driving mechanism 27 so as to be tightly fitted to the rear end of a preceding material 1. Since idle rolling is prevented by such method, the dimensional fluctuation of the product is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The invention relates to a method of charging subsequent material to a cold bilger mill without adversely affecting rolling.

(Prior Art) An example of a general mechanism of a cold bilger rolling mill is schematically shown in FIG. Briefly, the material (2) being rolled is supported by chucks (6 on 6) before and after the roll stand (5), and is rotated in the circumferential direction by rotatable guide tubes (7) (7). However, it is movable in the axial direction with respect to the guide cylinders (7) (7). The tail end of the mandrel (1) is fixed by a mandrel chain (8) which can be opened and closed, and a part of the taper at the tip reaches between the rolling rows /l/(41(4)).

The feed carriage (9) gives intermittent forward motion to the material (2) being rolled in response to the advance and retreat of the roll stand (5). The material charging device .alpha..degree. C. is arranged upstream of the above-mentioned tube making device (a) so that the path center (X-X)'i coincides with the material charging device .alpha..degree.

In the material charging device 01), although not shown, a rail is laid on the side of the pass center (X-X). Below this rail, a pair of front and rear pulleys 05 (45) is provided, and a pusher carriage α, which is the main drive mechanism of the bushing rod α4), is connected to a wire rope αQ stretched between the pulleys α (15). ] is fixed, and according to the word of mouth of the drum '17) that winds the wire rope αQ,
Drives mJ bush rod α Yu. The α frame is an electric motor, which can be connected to the drum α force via the pulley θ east belt wire and pulley 21).

In the pipe making device α2, material (2) moves in the direction of rolling row 1v (41 (4)) as rolling progresses, and when there is a space where all the material can be added, or the rolling of the leading material is completed. At the same time, the next material (2) is charged.The next material (2) is charged into the pipe making device α by the material (2) that is expected to be placed on the side of the pass center of the material charging device (11). ) (thick-walled raw pipe) one by one into the position (2) in the pass center (X-X), and this is done by pushing it out from the rear with the α force of the bush rod, but while the rolling roll is in operation. In a rolling mill where the mandrel chuck (8) is fully opened and the mandrel chuck (8) is allowed to be released, material can be charged into the rolling process A, and the mandrel chuck (8) can be fully opened. In rolling mills with a discontinuous rolling function that cannot be opened unless the rolls are stopped, it is customary to charge material after the "rolling process".

(Problem to be solved by the invention) By the way, the following material (2) by this Punyurod α condolence
Conventionally, the following two methods were used to expel people, but both had many problems.

That is, one of them is the electric motor 0 of the material charging device (11).
8) By manually operating the power supply, the next material (2) fully loaded personnel material <21 is brought close to the next material (2), and then manually brought close to Type 9 etc. and brought into close contact with it. However, this method not only becomes an obstacle to fully automatic operation of the rolling mill, but also when the mounting material (2) is located in the guide tube (7) of the pipe manufacturing equipment (a) and cannot be directly seen. A gap may remain between the mounting material (2) and the next material (2), and if this gap occurs, the feeding force will not be applied to the material being rolled. This causes a dimensional change in the cross-sectional shape of the blank-rolled portion of the rolled pipe product.

Another method is to control the material charging position in a regular manner, for example, by detecting the tail end position of the loading material <21 by an appropriate means, and measuring the length of the next material (2). This method determines the stopping position of the pusher carriage α■ of the material charging device α]) to be stopped.

However, although this method is easy to automate, the control content becomes complicated, and the determined position is too small or too small for the true stopping position due to the cumulative error of measurement system errors and instrument errors. If this occurs and there is a shortage, personnel materials (2
) and the next material (2), a l'I11 gap remains and the same blank rolling as in the above direction occurs, and in the case of a gap, the next material (2) is transferred to the charged material (2). Rolling roll /I/(41
Misalignment relative to (4)? As a result, only the positional deviation is not subjected to the prescribed rolling, which also causes a dimensional change in the cross-sectional shape of the incompletely rolled portion of the product pipe after rolling.

The non-invention is not a stupid thing that does not prevent automatic operation of rolling, but it is possible to always tightly charge the next material into the mounting material without any gap between them, and to make sure that the next material is in close contact with the next material. Even in the event of a rear-end collision with the charged scrap material, the impact force will not cause the rolled raw material to shift relative to the rolling rolls, and this will ensure that the dimensional variation of the pipe products due to dry striking and incomplete rolling is avoided. The purpose is to provide the following material charging method that can prevent this.

(Elaborate means for solving the problem) The present invention provides a material charging rod for charging the next material (2) into a cold bilger rolling mill via an auxiliary drive mechanism @ that satisfies the following formula 0. It is attached to the pusher carriage αa, which is the main drive mechanism of the device (11), and the pusher carriage α3 advances the bushing rod α41. When the advancing distance satisfies the following formula 0, the pusher carriage (
c), and after the pusher carriage [alpha] has stopped, the auxiliary drive mechanism (a) is activated to move the bushing rod [alpha]4) forward, whereby the tip of the next material (2) is moved forward. The gist is a method of charging the next material in a cold bilger rolling mill, in which the material is brought into close contact with the tail end of the charging waste material (21).

LS〉△εl＋△εko ・・・・・・・・・・・・・・・
・・・・・・・・・・・・・■L○=L/-LpB
-L3・・・・・・・・・・・・・・・・・・
...■ However, Ls: Auxiliary drive e horizontal stroke △εl
:Coasting error in the coasting distance that the pusher carriage travels after a stop command △εTotal position of the conifeed carriage is detected @Measurement error of the detection device L○ :The pusher carriage traveled forward until the stop command was issued Traveling distance L/: Distance between the tail end of the charged scrap material and the detector fixedly installed on the entrance side of the mandrel chuck to detect the tip M' of the next material LpB: Pusher carriage runs after command to stop Coasting distance (effect) Conventional material charging methods differ between manual and automatic methods, but the basic method was to prevent the next material from colliding with the charging scrap material. For this reason, there was always a risk of leaving a gap between the charged scrap material and the material, but the non-invention is based on the premise that the next material will collide with the fully loaded material, and the impact caused by the collision will be within the range where there will be no impact. This is something that we try to suppress. As a means for this, an auxiliary drive is used to move the next material (2) to be charged by the main drive mechanism α9 until the next material (2) is pushed out until just before it collides with the material 21, and then to the charged scrap material 12. It is extruded by the mechanism (a) so that the leading edge of the next material (2) is in close contact with the rear end of the mounting material +210. Since the main shock stop α3 is designed with emphasis on charging speed, it is difficult to bring the next material side (2) into close contact with the charged scrap material (2+) without giving an impact to the preceding material with this alone.
In addition, the auxiliary drive mechanism (b) is designed with emphasis on close contact and the impact Qf9 sum at that time, so if only this mechanism is used, the charging speed will be low and work efficiency will be deteriorated.

(Specific Description) FIG. 1 shows the bushing rod driving procedure in the method of the invention. As the material charging device 01), for example, as shown in the 31st RIK, wire rope CIQK
With Rensho Jig (To)? An air ring-metal as an auxiliary drive mechanism is installed on the main drive mechanism αj that is fully moved on the guideway 3υ, and a connecting jig (a) is attached to the piston holder. A bushing rod 29 can be provided which connects all the α stations and moves them forward.

As the auxiliary drive mechanism, an air cylinder whose extrusion force can be adjusted, a motor cylinder using a direct current motor, etc. are suitable.

Is the piston ■ an operation command from the control P'? When received, it moves and its stroke gives the necessary displacement to the bushing foot (4), and the air pressure supplied to the piston (a) gives a constant total pressure to the bushing rod (14).

Now, in Figure 1, this shows the following situation.

That is, the next material (2) of the chemical 1 length that has been pushed forward by the wire rope (bush rod 04 on the pusher carriage 0.1 connected to 1, Q) comes out from the tip f KQ at the sensor (iJ). This is a situation in which the pusher carriage 03 has stopped and is in the charging preparation position.It is also a situation in which rolling of the leading material of packaging material (2) has been completed and rolling has been temporarily interrupted.

In this situation, the distance between the rear end of the mounting material (2) and the sensor (to) is determined by the distance # from the retraction limit of the feed carriage (9) at the time of interruption of rolling. The rotation of the feed screw (9) is detected by a rotary encoder, etc., and corrected based on the uncompressed extension of the mounting material (2+) to the t value.
However, at this time, measurement errors due to position detection devices such as rotary encoders are unavoidable. Therefore, if the calculation length by the calculator is IJ/, then L, beam, m L, +△ε. The measurement error (≧0) of the position detection device that is fixedly provided on the entry side and detects the entire position of the ε conifeed carriage is the distance (minimum value) from the t detector.

Next, in the above situation, when the pusher carriage a3 is driven, the movement until it stops after receiving the stop command is as shown in the speed change diagram of the pusher rod 9 in Fig. 2. At point A, after a delay time specific to the system, the constant speed Vo begins to fall linearly, and reaches a point between B-B' and stops. That is, it is unavoidable that the stop timing varies E (distance of Δε/) from point B to point B' depending on changes in the running friction of the pusher carriage α1. Therefore, the coasting distance AI'tLps including this variation is
Then, Lps is LpB ''Lps+△εl However, LpB: Coasting distance (minimum value) that the pusher carriage travels after a stop command △ε/: Coasting distance that the pusher carriage travels after a stop command The error is (≧0).

Subsidy now! ! If the stroke eLs of the piston blade of the fiwJ mechanism gradient encoder is, the tip of the next material should be (
A stop command should be issued to the pusher carriage [alpha] when the distance ia point Ice, e is at the distance T-/-Lps-Ls). However, there is an error in L/, and there is a possibility that
(L/ - Lps - Ls ) distance α point, i.e. a
The line is extended by ε to σ−, and a stop command is issued at the friend point.

If this is not done, the leading edge of the next material may not come into contact with the trailing edge of the mounting material.

On the other hand, there is a possibility that the pusher carriage Q3, which starts elliptical running when the leading edge of the next material reaches point d, reaches point e with the elliptical running distance RLps extended by Δε/. Therefore, unless the leading edge of the next material is advanced by at least a distance i/j between point e and point 0, the leading edge of the next material and the leading edge of the preceding material may not come into contact with the trailing edge of the preceding material.

ec song short distance (1; Jf −ge −Of ) υ,
gf-Ls.

Since ge=△ε, cf-△ε2 (Ls-△εl
−ΔεJ). As mentioned above, the value between ec must be positive because it is the minimum distance that the piston (b) of the air cylinder moves to feed the next material. That is, (
Ls−△εl−△εko)〉0, which is LB>△ε
/+△ε is an egg white that limits the conditions.

From the above, if the air 7 link as the auxiliary drive F structure (a) with the stroke Lsffi is driven, the tip of the next material (2) will reach the 0 point in any case and be loaded in the middle of the stroke. Make sure to adhere closely to the tail end of the human resource material (2).

Moreover, one embodiment of the uninvented method is an auxiliary drive machine dj
・The charging load F is smaller than the total fixing force N of the mounting material, and the total length of the mounting material is determined by the allowable deflection δ between the charged materials defined by the charging speed v the inner diameter of the gold material guide. Charging is performed within a range that suppresses the collision energy when charging the next material to less than the multiplicative product of the delivery distance S and the total fixing force N.

According to this practical dry analysis, even if the next material completely collides with the fully loaded human material, the amount of impact at the time of collision is suppressed to a range that does not cause actual damage, so it is possible to completely prevent dimensional changes in the product. Moreover, it is easily compatible with automation and can be fully automated with a simple mechanism.

Figure 5 (4) (b) shows the next material (
(c) shows a situation where it is pressed by the charging system moving part (c). The charging system moving part is a hypothetical model that integrates the bush rod α return and the auxiliary drive mechanism @ (Fig. 8), and has a total value of fX. (At the top, the next material (c) contacts the rear end of the charging pile material (to), and in (b) the charging pile material (e) and the next material (c) are pushed to the allowable limit, Charged pile material (c) The contact part between the rear end and the next material @ tip is the guide tube (7)
It is bent by δ until it is supported by the guide side wall such as (Fig. 4).
This is the next state in which the tip-to-tip pressure lII'L (FIG. 1(a)) is reduced by S. Therefore, consider the following two cases.

■ Rolling row tv (4J (4
) grips the charging pile material with a roll chuck and a chuck (
6) If a force greater than the total fixing force N of the charging pile material, which is the sum of the material chucking force etc. according to (Fig. 4), is applied to the next material as a forwarding force, the charging pile material (c) /l/
(41(4)), causing a dimensional change in the cross-sectional shape of the rolled product. In order to prevent displacement, the charging load F must be smaller than the total fixing force N. In other words, FAN...
・・・・・・・・・・・・・・・・・・・・・・・・
・(1).

As for the lower limit of the charging load F, it goes without saying that a load that advances the next material (c) is required.

■ The moving distance S of the tip of the charging system moving part when the next material pushes the charging pile material is as shown in Figure 5 (b), assuming that all the materials are of equal length and there are two pieces. If we consider a general n tree as shown in Figure 6 ((a) to When pushed in, one bends at each contact point and produces a deflection δ, which reduces the distance Nu S. S is approximately expressed by the following equation, while the auxiliary drive mechanism slope and one shaft rod α are The total quality of the charging system moving part (to) consisting of
The kinetic energy of the impact at velocity V is 1! -MV'. The synergy of the total fixing force N and the shrinkage allowance S [SN is the energy required to shrink the n-tree linear contact materials. If the kinetic energy ++ 1 y f of the material charging device is smaller than the energy that shrinks the linear abutting material by S, all of the kinetic energy is absorbed by the shrinkage energy of the abutting material and the abutting part of the material is Compression wise shape does not cause any damage. Therefore, dimensional changes in the cross-sectional shape of the product do not occur.

Taking the model case of W and s6 as an example, in order to completely prevent dimensional fluctuations of the pipe, the following relationship is required, and from this, the charging speed V is:

There is no particular regulation regarding the lower limit of the charging speed V.

However, it is more effective to increase the charging speed v as much as possible within the above range in order to increase the charging efficiency.

If the configuration of the charging system moving part is such that the bushing rod α is connected to the piston rod of the air cylinder, which is the auxiliary drive mechanism (a) (Fig. 3), the charging load F will be at the inlet of the air cylinder. (The flow rate of air that enters from η and presses the piston blade can be adjusted. According to this device,
It is possible to charge the next material using the crusher carriage a3 connected to the wire rope 0ej until it collides with the next material, and then to charge the material using the air cylinder.

(Example) A zirconium alloy pipe with an outer diameter of 18.0 mm and an inner diameter of 14,511 m was produced using a cold Bilga rolling mill with an outer diameter of 10.7 mm.
An air cylinder is used as an auxiliary drive mechanism for machining a culm with an inner diameter of 9.4mm, and its stroke LS is 2.
5ovm (>△ε/+ελ). However, △ε/6
0w11 △εko20, L/8400M, LpsxO
It's Maro. The stop command for pusher carriage α
Ls). Then, after the pusher carriage 0 stops, the air cylinder is activated and the next material (
The tip of 2) was brought into close contact with the tail end of the mounting material (21).

Other charging specifications for this material charging are shown in Table 1, and charging conditions are shown in Table 2. Then, variations in the inner and outer diameter dimensions of the pipe after rolling were measured using an ultrasonic probe. .

Conditions T, Condition ■, and Condition M1 shown in Table 1 and Table 2 were satisfied, and the test results are shown in Figure 7, Conditions.
No change in the outer diameter was observed, the result was a good result and the conditions of the present invention were not met. Even if the test results are shown in Figure 7, the conditions for non-invention are not met. Since the test results are not available, the condition for non-invention is not met. The test results are shown in Fig. 7, Condition (■).

In cases where there is a complete deviation from the compliance and non-invention found in each of the conditions ■, eye,
The mounting material being rolled slightly deviates in the rolling direction,
This caused both the inner and outer diameters to be 1
There were parts that were larger than 2/100" and the inner and outer diameters had excessive fluctuations, resulting in a poor result.

(Effects of the invention) The uninvented material charging method charges the next material into the mounting material so that its tip is completely in contact with the material, thereby preventing dimensional fluctuations of pipe products by eliminating air rolling during automatic operation. However, it has a large effect on improving production efficiency and quality.

[Brief explanation of drawings]

Fig. 1 shows the procedure for driving the bushing rod in the method of the present invention, Fig. 2 is a diagram showing the speed change when the bushing rod is stopped, Fig. 3 is a rocky shore composition showing an example of the charging device, and Fig. 4
Figure 1 is a schematic perspective view of the entire cold Birga rolling mill A pipe making line from material charging to the pipe manufacturing equipment, and Figure 5 shows the charging system model/V of the cold Birga rolling mill. (b) The figure shows the schematic diagram when the charging moving part contacts the next material, (B) shows the schematic diagram when pushing the next material, and Fig. 6 shows the moving distance S when pushing n materials. b) The figure is an n-4 tree, (b) the prisoner is an n-3 tree.
Book, (c) Figure is a schematic diagram showing the case of n -4,*, No. 7
The figure is a diagram showing all the outer diameter variation and inner diameter variation in the test results under conditions T, condition (2), condition (2), and condition (2) in the example. ■ = mandrel, 2.2.2: material, 4.4: rolling roll, 5: roll nutand, 6.6: chuck, 7.7:
Guide cylinder, 8: Mandrel chuck, 9: Feed carriage, 10: Material inlet, 11: Material C + charging device, 1
2: Pipe making device, 13: Main drive mechanism or pusher carriage, 14: Gutsunyurod, 15: Pulley, 16: Wire rope, 17: Drum, 18: 7gX! ill
Stand, 19: Pulley, 20: Belt, 21: Pulley,
22: Chuck device, z3: Charge foil material f-1, 24: Next material placement, 25: Charging system transfer force section, 26: Connection jig, 27
: Auxiliary drive mechanism, 28: Inlet, 29: Binuton, 3Q:
id7 tying tool, 81 guideway, 32: sensor. 1[-Yo1zedem・2 Figure 7~ C: . . −)−Noko
3 (

Claims (2)

[Claims] (1) The push rod for charging the next material (2″) into the cold bilger rolling mill is connected to the main material charging device (11) through an auxiliary drive mechanism (27) that satisfies the following formula [1]. It is attached to a pusher carriage (13) which is a drive mechanism, and the push rod (14) is attached to the pusher carriage (13).
is advanced, and when the advancing distance satisfies the following formula [2], a command to stop the pusher carriage (13) is issued, and after the pusher carriage (13) has stopped, the auxiliary drive mechanism (
27) A method for charging a next material in a cold bilga rolling mill, characterized in that the push rod (14) is moved forward by operating. L_s>△ε_1+△ε_2......[1] L_o=L_1-L_p_s-L_s......[2] However, L_s: Stroke of the auxiliary drive mechanism △ε_1: Ellipse of the elliptical distance that the pusher carriage travels after the stop command Running error △ε_2: Measurement error of the position detection device that detects the position of the feed carriage L_o: Distance traveled forward until the pusher carriage stop command is issued L_1: The tail end of the loaded material and the leading edge of the next material Distance L_p_s to a detector fixedly installed on the entrance side of the mandrel chuck to detect passage: Elliptical travel distance that the pusher carriage travels after receiving a stop command (2) Make the charging load F by the auxiliary drive mechanism (27) smaller than the total fixing force N of the charged material, and set the charging speed V to the allowable deflection between the charged materials specified by the inner diameter of the material guide cylinder. Charging is carried out within a range in which the collision energy when charging the next material is suppressed to less than the multiplicative product of the shrinkage S of the total length L of the charged material due to the amount δ and the total fixing force N. A method for charging a next material in a cold bilger rolling mill as set forth in claim (1).