JP2680496B2 - Continuous forging device for slab strand - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous forging apparatus suitable for use in the case of forging a cast strand obtained by continuous casting in the drawing process.

[0002]

2. Description of the Related Art As a device for performing forging processing in the solidification completed region of the cast strand in the drawing process of the cast strand in continuous casting, there is known one having a structure disclosed in Japanese Patent Laid-Open No. 2-70363. Has been. According to such an apparatus, center segregation and zigzag can be reduced, and the internal quality of the product can be advantageously improved. However, the device itself has the following problems, and there is still room for improvement.

1) Due to uneven cooling in the secondary cooling zone, seams of continuous casting of different steel types, or straightening defects in the pinch roll installation area, the cast strands are warped and deviated from the conveying line. Occasionally, it may not be possible to process with a uniform amount of reduction from the front and back of the cast strand due to the anvil. 2) Also, due to the imbalance between the front and back sides, the rolling down force on the surplus side acts not as a processing force for the slab strand but as an external force for the equipment, which may damage the device, and the life thereof is also extremely short. 3) When hydraulic cylinders are arranged to prevent overload during forging and adjust the distance between the anvils,
For example, when the difference between the pressure in the cylinder before forging and the pressure in the cylinder during forging is as high as 200 kg / cm ² , the compression of the hydraulic oil causes a volume change of about 1%, Even if the anvils move from the closest position to each other, a reduction force remains due to the compression of the hydraulic oil, and this becomes the rotational force that reversely rotates the crankshaft (hereinafter simply referred to as negative torque). In the reduction gear connected to the shaft, the tooth flanks of gears collide with each other due to the gap due to backlash, and abnormal noise (percussion noise) or vibration is generated, which may have a significant adverse effect on the life and stable operation of the device itself. is there.

Regarding the above 1) and 2), for example, Japanese Patent Laid-Open No.
Position control can be performed by applying a hydraulic servo valve or hydraulic control mechanism as disclosed in Japanese Patent Publication No. 60-82222, but since this method is expensive, the equipment cost is unavoidable and the device Since hydraulic oil for controlling requires high cleanliness and requires time and effort for maintenance, it is necessary to have a structure separated from a general hydraulic system, which is not suitable for actual operation. Also, there is no solution for 3) so far.

[0005]

When the cast strand obtained by continuous casting is subjected to forging processing in the drawing process,
Even if the cast strand is bent or lifted, the anvil can always be made to follow the strand and processed with a uniform reduction amount from the front and back surfaces, and furthermore, it is unavoidable that it will occur during forging processing. It is an object of the present invention to propose a forging pressure processing apparatus capable of reducing abnormal noise and vibration as much as possible.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a slab strand drawn from a continuous casting mold is sandwiched from two opposing surfaces, and the slab strands are repeatedly approached and separated from each other, and the slab strand is finally solidified during drawing movement. A device with a pair of anvils for continuous forging in the area, one of the anvils is fixedly held on the mainframe, and the other anvil is fixed on a subframe that can be moved along the guides of the mainframe. Hold and connect the mainframe and subframe to the crankshaft that guides the reciprocating motion of each anvil by approaching and separating each other via links, and adjusting the distance between each anvil and each anvil. Positioning cylinders are arranged, and a hydraulic oil flow passage having a switching valve is provided between the rod side oil chamber and the head side oil chamber of each positioning cylinder. Bonded via, formed by connecting via the bypass path hydraulic fluid flow path leading to the head-side oil chambers of the positioning cylinders, it is a continuous forging apparatus of the slab strands characterized by.

According to the present invention, in the forging device having the above-mentioned structure, the pilot check valves arranged in opposite directions are arranged in the bypass path. Further, the positioning cylinder is equipped with a balance cylinder to prevent the rod from moving due to its own weight. Further, it is assumed that the positioning cylinder is provided with a displacement gauge for measuring the displacement of the rod of the cylinder so that the slab strand can be rolled down by a predetermined rolling amount. A flow control valve and a relief valve should be provided in the hydraulic oil flow passage of the positioning cylinder.Furthermore, the hydraulic oil flow passage leading to the head-side oil chamber and the hydraulic oil flow passage leading to the rod-side oil chamber of the positioning cylinder should be provided. A hydraulic oil return circuit having a pilot check valve may be provided in between.

According to the present invention, in the forging device having the above-mentioned structure, the working oil flow path leading to the rod-side oil chamber of each positioning cylinder may be connected to each other via the second bypass path. In that case, a pilot check valve can be arranged in the second bypass path.

Further, according to the present invention, the device having the above-mentioned structure is provided with a braking means for braking the reciprocating motion of the anvil toward and away from each other, or at least the forging press working start timing of the cast strand is different. A set of anvils may be provided.

FIG. 1 shows the construction of a forging machine according to the present invention. Numbers 1a and 1b in the figure are anvils that sandwich a cast strand S from both sides (upper and lower sides in this example) in the thickness direction, and 2 is an anvil 1b. The main frame 3 which is fixedly held is a subframe 3 which is fixedly held on the other anvil 1a and is movable along the guide 2a of the main frame 2, 4 is a crankshaft, 5a and 5b are links, and these links 5a, One end of each 5b is swingably connected to the main frame 2 and the sub frame 3,
The other end of each is connected to the crankshaft 4.
6, 7 are head side oil chambers 6a, 7a, rod side oil chambers 6b,
A positioning cylinder for adjusting a distance between the anvils 1a and 1b, which has a cylinder 7b.
Are fixedly held by the link 5a and the subframe 3, respectively. 8a and 8d, 8c and 8d are positioning cylinders 6,
7 is a hydraulic oil flow path connecting the head side oil chambers 6a, 7a and the rod side oil chambers 6b, 7b, and a set of hydraulic oil flow paths 8a, 8b and 8c, 8
A switching valve C capable of switching between the tank port T and the pressure port P is arranged in each group of d. Further, 9 is a bypass path for hydraulic oil that connects the head side oil chambers 6a and 7a of the positioning cylinders 6 and 7, and 10 and 11 are pilot check valves in the bypass path 9.
A pressure port P ₁ of a pilot hydraulic circuit that enables the supply of hydraulic oil is connected to 0 and 11. Reference numeral 12 denotes a balance cylinder which has a function of preventing the rod of the positioning cylinder 7 from naturally falling due to its own weight and preventing rattling with the link. The balance cylinder 12 is a lifting cylinder corresponding to the weight of the anvil and the rod. Have power 13,1
Reference numeral 4 is a displacement gauge for measuring the displacement amounts a, b of the rods of the positioning cylinders 6, 7, and 15 and 16 are flow control valves (for example, a proportional electromagnetic type is applied). 1
6, the mutual distance between the anvils 1a and 1b is adjusted and the position of each anvil is adjusted. This flow control valve 15,16
Then, the moving speed of the anvil at the time of position adjustment can also be controlled separately. Reference numerals 17 and 18 are relief valves. These relief valves 17 and 18 are activated when the anvil is overloaded and the inside of the cylinder exceeds a predetermined pressure, such as when the cast strand S whose temperature has dropped is forged. It has the role of discharging oil out of the system. Further, 19 and 20 are pressure detectors arranged in the hydraulic oil flow passage 8, and the pressure detectors 19 and 20 detect abnormal pressures in the head side oil chambers 6a and 7a of the positioning cylinders 6 and 7, respectively. .

When the crankshaft 4 provided with a drive source is rotated, the main frame 2 and the subframe 3 connected to the crankshaft 4 via links 5a and 5b respectively move up and down. Since the anvils 1a and 1b are fixedly held by the main frame 2 and the sub-frame 3, respectively, the forging process of the slab strand S is performed by repeating the reciprocating motions of approaching and separating from each other according to the movement of the frame. FIG. 2 shows a front view of the forging machine having the above structure.

[0012]

According to the present invention, the working oil flow paths 8b and 8 connected to the head side oil chambers 6a and 7a of the positioning cylinders 6 and 7, respectively.
c is connected to each other by a bypass path 9 provided with pilot check valves 10 and 11, and when the cast strand S is pressed, the pilot check valves 10 and 11 are operated to connect the head side oil chambers 6a and 7a. . As a result, even if the distance from the surface of the strand to the anvil is different between the front and back of the strand because the position of the slab strand S floats and the position of the anvil is different. Since the correction is automatically performed, the strand S can be uniformly pressed from above and below.

In the structure in which the anvils 1a and 1b that control the forging of the slab strand S are fixedly held to the frames 2 and 3 through the positioning cylinders 6 and 7, the positioning cylinder 6 is used during the forging and non-forging. The degree of compression of the hydraulic oil changes in response to changes in the internal pressures of the cylinders 7 and 7, and accordingly, the positions of the rods of the positioning cylinders 6 and 7 are minute for each forging cycle of approaching / separating the anvil. 2 to
It fluctuates and swings by about 3 mm. Therefore, the minute amplitude of the anvil becomes a disturbance signal, and there is a possibility that the position cannot be accurately held during the forging process. Therefore, in the present invention, the amount of reduction is appropriately adjusted based on the detection values of the displacement gauges 13 and 14.

FIG. 3 shows the flow of hydraulic oil in positioning when the space between the upper and lower anvils 1a and 1b is narrowed and the reduction amount is increased. In the case of performing such an operation, first, the pilot check valves 10 and 11 of the bypass path 9 are closed, and the switching valve C is switched to # 3 so that the positioning cylinder 6 has a predetermined reduction amount. The hydraulic oil is fed into the head side oil chambers 6 and 7 of the hydraulic oils 7 and 7.

FIG. 4 shows the distribution of hydraulic oil in positioning when the space between the upper and lower anvils 1a and 1b is widened to reduce the amount of reduction, and when such an operation is performed, switching is performed. The valve C is switched to # 4, and the working oil is fed into the rod-side oil chambers 6b and 7b of the positioning cylinders 6 and 7 so that the set of the anvil has a predetermined opening. Also in this case, the pilot check valves 10 and 11 are closed.

For fine adjustment when hydraulic oil leaks from the positioning cylinders 6 and 7 during forging and the reduction amount deviates from the set value, the hydraulic oil flow paths 8b and 8c of the upper and lower anvils 1a and 1b are bypassed to the bypass path 9. Keep it conducting by
The operation can be performed by replenishing both with a predetermined amount of hydraulic oil at once, without performing an individual operation. In this case, there is an advantage that the number of times the switching valve C is switched can be reduced.

FIG. 5 shows the flow of hydraulic oil when fine adjustment is performed in the direction of narrowing the distance between the anvils 1a and 1b. In this case, the pilot check valves 10 and 11 of the bypass path 9 are controlled. Then, the head side oil chambers 6a and 7a of the positioning cylinders 6 and 7 are brought into conduction.

FIG. 6 shows the flow of hydraulic oil when fine adjustment is performed in the direction of increasing the distance between the anvils 1a and 1b. In this case, the switching valve C is switched to # 4 and the flow chart of FIG. Perform the same operation as.

FIG. 7 shows a state in which the anvils 1a and 1b are held in the forging pressure state. In this case, in the switching valve C, the oil chambers 6a, 7a and 6b, of the positioning cylinders 6 and 7, respectively.
The flow passages 8a to 8d leading to 7b are locked to prevent hydraulic oil from leaking so as to keep the enclosed pressure in the cylinder constant, and the pilot check valves 10 and 11 of the bypass passage 9 are kept conductive. When the forging process is continuously performed, the volume reduction amount and the leakage amount due to the compressibility of the hydraulic oil are measured by the displacement gauges 13 and 14, and the switching valve C is controlled to form a hydraulic circuit as shown in FIG. The amount of oil in the head side oil chambers 6a, 7a is kept constant by replenishing the oil.

The reduction amount of the slab strand S is the anvil 1
Since it is determined when a and 1b come closest to each other, it is desirable to set the position of the anvil in this state. Note that mechanical elongation such as the elongation of the guide 2a of the main frame 2 becomes an error factor, and its amount is determined by the rolling force. Therefore, subtract the stretching amount from the value measured by the displacement gauges 13 and 14 to reduce the rolling amount. Is preferably corrected as appropriate.

During forging of the slab strand S, in order to adjust the distance between the anvils 1a and 1b, that is, the amount of reduction of the slab strand, the hydraulic oil is compressed into and out of the flow paths 8a to 8d. Considering the amount and the like, it is preferable to perform it during non-forging. FIG. 8 shows a state in which the anvil 1a comes into contact with the slab strand S to start forging, and FIG. 9 shows a state in which the forging process with the anvil 1a is completed and the slab is separated from the strand. As shown in FIG. 9, when the rotation angle of the crankshaft 4 in the forging device is Θ, the timing for taking in and out the hydraulic oil is preferably in the range of β <Θ <360 ° + α. In addition, in FIG. 9 above, the dimension b
Is the height of the hydraulic oil of the positioning cylinder in the state where the anvil 1a and the anvil 1b are closest to each other, x is the height corresponding to the compression amount of the hydraulic oil at that time, and the hydraulic oil is x
The anvils 1a and 1b start to separate from the slab strand at the time of expansion by a considerable amount, and the rotation angle of the crankshaft 4 at this time becomes β.

At the start of forging, the setting interval of the anvil is adjusted according to the procedure shown in FIG. Since FIG. 10 above is vertically symmetrical, only the upper anvil 1a is shown. First, in the first machining, hydraulic oil is sent from the standby position of the anvil to the positioning cylinder so that the displacement amount corresponding to A + B in the state shown in FIG. 3 is obtained, and the forging pressure is changed to the state shown in FIG. Perform processing. Anvil 1 at this time
The reduction amount of a corresponds to B. Next, the second operation is performed in the state shown in FIG. 4 so as to obtain a reduction amount corresponding to C in addition to the reduction amount in the process of finishing the first reduction and separating the anvils from each other. Oil is supplied, and in the third time, hydraulic oil is supplied to the positioning cylinder in the same manner so as to obtain a reduction amount equivalent to D, and forging processing is performed in the states shown in FIG. 7. In this way, in the forging process in the steady state after the fourth time, the forging process is continuously performed so that the amount of reduction corresponding to B + C + D is obtained. Figure
1a 'in 10 shows the maximum separation state of the anvil in the forging process in the steady state. When changing the reduction amount, the moving speed of the anvil depends on the flow control valve
Control with 6.

According to the present invention, as described above, by conducting the head-side oil chambers 6a, 7a of the positioning cylinders 6, 7, it is possible to uniformly reduce the cast strand S in the thickness direction during the forging process. However, since the positioning cylinder is directly subjected to the forging pressure, a cylinder having a large diameter is required, and therefore the positioning cylinder needs to be downsized. To reduce the size of the positioning cylinder, it is possible to increase the maximum hydraulic pressure.
Is actually a limit of about 300 kg / cm ² from the viewpoint of stable operation of the equipment due to the pressure resistance of the hose to be used for supplying hydraulic fluid, for example the diameter of the cylinder in the case of rolling force 2000t is 950 mm It will be about. When applying a device equipped with a positioning cylinder with such a large diameter and performing forging processing,
There is a risk of causing the following problems.

That is, at the start of the forging process, as shown in FIG. 10 above, it is necessary to quickly control the introduction and removal of hydraulic oil between the standby position of the anvil and the steady forging state. If the cylinder diameter of the positioning cylinder is large, the amount of oil required to operate it will be very large, which requires a fairly large-capacity pump etc. as a hydraulic source, leading to an increase in equipment costs, and forging processing. If it enters a steady state, the movement of the anvil only needs to correct the error of the reduction amount, and the required amount of oil is very small.Therefore, it would be equipment-wise to use a large hydraulic pressure source just to start the forging process. Many.

Therefore, according to the present invention, in order to reduce the capacity of the hydraulic power source, as shown in FIG.
Using the switching valve C having # 3 capable of communicating d, 8c and 8d, the head side oil chambers 6a, 7a of the positioning cylinders 6, 7 and the rod side oil chambers 6b, 7b are electrically connected to each other to form a differential circuit. To reduce the amount of oil required. In this case, return lines 25 and 26 having pilot check valves 21, 22 and 23, 24 are connected to the hydraulic oil flow paths 8a and 8b, 8c and 8d, respectively. In FIG. 11, reference numeral 27 is a second number that connects the hydraulic oil flow paths 8a and 8d.
Pilot check valves 28 and 29 are arranged in the second bypass path 27. here,
As shown in FIG. 13, the differential circuit sends hydraulic oil to both the head side and the rod side of the cylinder, and uses a force equivalent to the product of the pressure receiving area difference between the head side and the rod side and the hydraulic pressure as the driving force. Although this type has the disadvantage of reducing the driving force, the amount of oil supply also decreases at the ratio of {(head side area-rod side area) / head side area}, so the amount of oil supplied during operation is reduced. This is an effective hydraulic circuit. As shown in FIG. 12, the cross section of the positioning cylinder 6 is a cross section A _H of the head side oil chamber, a cross section A _D of the rod side oil chamber, and a cross section A _{R of the} cylinder rod.
In this case, the hydraulic oil reduction ratio (γ) is γ = (A _H −
Since A _D ) / A _H = A _R / A _H , the driving force for moving the anvil is also reduced by the ratio of γ. However, the operation of moving the anvil is during non-forging processing, and the required driving force may be equivalent to the weight of the device attached to it, so it is sufficiently small compared to the rolling force during forging processing, so it can be used as a differential circuit at all. No problem. The differential circuit is configured by switching the switching valve C to # 3, and is applied in the case where the mutual distance between the anvils is reduced (in the rolling direction of the cast strand S).

When the mutual distance between the anvils is increased,
In the configuration of FIG. 11, if the self-weight (W _e ) applied to the rod of the cylinder on the side of the albin 1b and the push-up force (F) of the balance cylinder 12 are used, adjustment can be performed simply by lowering the pressure in the head-side oil chamber. Since hydraulic oil is not required to be supplied from the source, the capacity of the hydraulic source can be reduced, and the possibility of malfunction due to breakdown of hydraulic equipment can be reduced. In this case, the return circuit 2
Keep 5,26 conductive.

In order to set the pushing force (F) of the balance cylinder 12, the bypass passage 9 of the positioning cylinders 6 and 7 is in a conductive state during the forging process, so that the pushing force (F) is By balancing F) with the own weight of the structure including the main frame 2 and the anvil 1b, it is possible to avoid one-sided contact during the forging process and realize a smooth reduction. The setting value of the pushing-up force (F) is preferably set in the range of the following formula in consideration of the pressure loss in the hydraulic oil flow path, the sliding resistance of the cylinder, and the like. 0.7 (W _e + W _U ) ≦ F ≦ 1.3 (W _e + W _U ) W _e : Self-weight of main frame etc. applied to rod of positioning cylinder 6 W _U : Self-weight of anvil cradle etc. applied to rod of positioning cylinder 7

In the hydraulic circuit shown in FIG. 11 above, when the anvils 1a and 1b are positioned in a direction in which the distance between them is narrowed (moved in the pressure reducing direction), the switching valve C is switched to # 3 as shown in FIG. To form a differential circuit, and the pilot tick valves 21, 22 and 23, 24 of the return circuits 25, 26, the pilot check valves 10, 11 of the bypass path 9 and the pilot check valves 28, 29 of the second bypass path 27. Is closed to adjust the amount of hydraulic oil in the positioning cylinder, but this configuration has the advantage of requiring a small amount of oil.

When positioning is performed in a direction in which the spacing between the anvils is increased (opening of the anvil), the switching valve C is set to # 2 as shown in FIG. 14, and the pilot check valves 21, 26 of the return circuits 25, 26 are also used. 22 and 23, 24 are connected to each other, and the pilot check valve 10,
Leave 11 and 28,29 closed. By adopting such a configuration, the anvil 1a becomes the balance thin lid 1
It is pushed up by the pushing force (F) of 2 and 12, and the working oil in the head side oil chamber moves to the rod side oil chamber. On the other hand, for the anvil 1b, the weight of the body frame 2 (W _e ).
As a result, the working oil in the head-side oil chamber moves to the rod-side oil chamber, and the anvil distance can be easily adjusted without using a hydraulic drive source. It should be noted that, in performing such an operation, excess hydraulic oil that is not supplied to the rod-side oil chamber is collected in the tank via the drain D of the return circuits 25 and 26.

FIG. 15 shows the anvils 1a, 1 when correcting the reduction amount.
It is a view showing a flow situation of the hydraulic oil in the case of finely adjusting the interval of b to be smaller. In this case, the switching valve C forms an operating circuit as # 3, the respective pilot check valves of the return circuits 25 and 26 are closed, and the bypass path 9 and the second bypass path 27 are made conductive.

FIG. 16 shows the flow of hydraulic oil when fine adjustment is performed in the direction of increasing the distance between the anvils 1a and 1b when correcting the reduction amount. in this case,
Since the return circuits 25 and 26 are in the conductive state and the pushing force of the balance cylinder and the weight of the frame body act as described in Fig. 14 above, it is sufficient to reduce the pressure in the oil chamber on the head side. No pressure source is needed to supply the. Also in this case, the bypass paths 9 and 27 need to be electrically connected.

FIG. 17 shows a state in which the anvil is held in a state where it can be forged, and in this case, the switching valve C is switched to # 2, the rod side oil chamber of the positioning cylinders 6, 7 and the head side oil chamber. Both of them are set to a constant internal pressure so that the rolling force at the time of forging is received by the sealing pressure of the positioning cylinder. In this state, the head side oil chamber 6a,
7a and the rod-side oil chambers 6b, 7b are electrically connected to each other through the bypass path 9 and the second bypass path 27, so that even if the slab strand S is deformed, the hydraulic oil is appropriately moved to make it even from above and below. Forging can be performed with the amount of reduction. Relief valve when the anvil is overloaded
By controlling 17 and 18 to release the hydraulic oil, the operation is switched to the circuit as shown in FIG. 14 and the anvils 1a and 1b are quickly opened.

FIGS. 18 and 19 show an example in which a braking means for braking the reciprocating motion of the anvils 1a and 1b toward and away from each other is provided in the device having the above-mentioned structure, and the numeral 30 in the drawings is shown. The braking device 30 is arranged on the crankshaft 4 and applies braking to the reciprocating motion of the anvils 1a and 1b toward and away from each other to minimize the negative load torque generated during forging. Further, 31 is a speed reducer connected to the crankshaft 4, and 32 is a drive source for rotationally driving the crankshaft 4.

In the continuous forging machine having a structure in which the anvils 1a, 1b are fixedly held on the frame via the positioning cylinders 6, 7, the anvils 1a, 1b
1b is in the state where they are closest to each other (at the time of completion of the reduction), but the reduction force remains by the amount of the compression of the hydraulic oil in the positioning cylinders 6 and 7 even though it enters the stage where they are separated from each other.
As indicated by, the torque becomes negative, and abnormal noise and vibration due to backlash cannot be avoided in the speed reducer 31 connected to the crankshaft 4. Therefore, in the present invention, as shown in FIGS.
As shown in, the braking device 30 is arranged on the crankshaft 4, which is a region of the forging machine that is as close to the load fluctuation source as possible, and the range corresponding to the negative torque or the device such as the speed reducer (the negative range) (Slightly lower than the torque of), apply braking to the moving speed of the anvil to prevent or reduce the negative torque during forging. Anvil 1
As a timing for applying braking to the moving speeds of a and 1b, it is convenient for the device to always act during the forging process, but when the cost of operating power is a problem, the anvil is separated from each other. It is better to apply an electrical sequence or the like only to the stage (timing at which abnormal noise occurs) to brake.

The braking device may be either a drum type or a disc type, but in the case of continuously applying braking, it is preferable to have a structure having a cooling function. As described above, the arrangement position of the braking device is preferably set to one axis of the speed reducer 31 as a region as close as possible to the load fluctuation source as shown in FIG. It can also be arranged on two to four connected axes, and in this case, the capacity of the braking device can be reduced.

Next, FIGS. 22 and 23 show an example of a device incorporating at least two forging machines at different forging start times for the cast strand S. In this example, four strand presses are provided on one crankshaft, each corresponding to four strands.
° It is shifted and connected. In the device having such a configuration,
Negative torque generated during forging of each anvil can be canceled by the reduction of other anvils with different reduction timings, so noises in the reducer and equipment vibrations can be effectively reduced. In addition, there is an advantage that it can be applied to the multi-strand forging process to improve the productivity.

FIG. 24 shows changes in the rotation angle of the crankshaft 4 in the forging process of the cast strand S. If the forging process of the slab strand S is completed at Θ = 90 ° and the reduction force due to the compressibility of the hydraulic oil and the elongation of the frame is maintained within the range of the angle β ′, the negative torque is the angle β. Since it occurs in the range of ', in the present invention, the reduction by the other anvil is started during this period. FIG. 25 shows the reduction situation when two anvils S, S are machined by two sets of forging machines A, B, especially for each anvil 1a.

FIG. 26 shows a load torque curve of the crankshaft 4 of the apparatus having the structure shown in FIG. As shown in the figure, the rolling end timing and the rolling start timing at the time of forging of the anvil are overlapped, and the total load torque of the crankshaft 4 is positive or negative torque is applied within a range that does not hinder the strength and life of the reduction gear. By reducing the noise, it is possible to avoid abnormal noise and vibration of the equipment due to load fluctuation.

[0039]

EXAMPLES Example 1 Carbon steel having a width of 340 mm and a thickness of 270 mm (0.05 to 1.0% C)
While continuously casting the slab strands of No. 1, by applying the apparatus having the configuration shown in FIG. 1 above, the reduction amount = 80 mm, the casting speed = 0.
Forging processing was performed under the condition of 9 m / min. As a result, even if the slab strands warp, the anvil follows them, so that the slab strands can be uniformly pressed down from the upper and lower surfaces, and the internal quality of the obtained strands was also good. In this case, with and without application of the braking device 30 as shown in FIG. 19 above,
A comparative study was conducted on the vibration and noise of the equipment, but it was confirmed that the vibration and noise can be reduced to less than half when the braking device is applied compared to when it is not applied.

Example 2 Carbon steel having a width of 340 mm and a thickness of 270 mm (0.05 to 1.0% C)
While continuously casting the cast slab strand, the apparatus having the configuration shown in FIG. 11 was applied for forging, and the amount of hydraulic oil used in the apparatus in that case was investigated. Further, the amount of hydraulic oil used in the case of forging under the same conditions by applying the apparatus shown in FIG. 1 was also investigated. As a positioning cylinder of the forging machine, the cylinder diameter is 640 mm, the rod diameter is 400 mm (A _H = 3217 cm ² , A _R = 1257 cm ² ),
Maximum operating pressure 250 kg / cm ² , cylinder movement speed (V) 15
mm / S was used. As a result, in the structure shown in FIG. 1, the amount of hydraulic oil used is A _H · V × 2 = 3217 ×
While it was 1.5 × 60 × 2 × 10 ^-3 = 579 l / min,
In the case shown in FIG. 11, A _R · V × 2 = 1257 × 1.5
It was ^x60x2x10-3 = 226 l / min, and it was confirmed that the amount of hydraulic oil used could be reduced by about 61%. Further, the equipment cost of the hydraulic system is about 70 in the case shown in FIG. 11 when the value shown in FIG. 1 is 100, and the equipment cost of the forging machine is about 92, which is 8% of the total equipment. We were able to reduce equipment costs.

[0041]

As described above, according to the present invention, when forging is performed in the process of drawing a cast slab, even if the strand is deformed due to uneven cooling or the like, the strands are evenly distributed from the front and back surfaces. It can be reduced by the amount of reduction. Further, since the cylinder for determining the position of the anvil does not need to have a particularly large capacity, the apparatus itself can be made compact, and the noise and vibration of the equipment during the forging process are extremely small.

[Brief description of the drawings]

FIG. 1 is a structural explanatory view of a forging pressure processing apparatus according to the present invention.

FIG. 2 is a front view of the forging pressure processing apparatus according to the present invention.

FIG. 3 is an explanatory diagram of an operating procedure of the device according to the present invention.

FIG. 4 is an explanatory diagram of an operating procedure of the device according to the present invention.

FIG. 5 is an explanatory diagram of an operating procedure of the device according to the present invention.

FIG. 6 is an explanatory view of an operating procedure of the device according to the present invention.

FIG. 7 is an explanatory diagram of an operating procedure of the device according to the present invention.

FIG. 8 is a diagram showing a positional relationship between a rotation angle of a crankshaft and an anvil of a device according to the present invention.

FIG. 9 is a diagram showing a positional relationship between a rotation angle of a crankshaft and an anvil of a device according to the present invention.

FIG. 10 is a diagram illustrating a situation from the start of forging processing to a steady state.

FIG. 11 is a diagram showing another example of the forging processing apparatus according to the present invention.

FIG. 12 is a view showing a cross section of a positioning cylinder.

FIG. 13 is an explanatory diagram of an operating procedure of the apparatus shown in FIG.

FIG. 14 is an explanatory diagram of an operating procedure of the apparatus shown in FIG.

FIG. 15 is an explanatory diagram of an operating procedure of the device shown in FIG. 11.

16 is an explanatory diagram of an operating procedure of the device shown in FIG. 11. FIG.

FIG. 17 is an explanatory diagram of an operating procedure of the device shown in FIG. 11.

FIG. 18 is a view showing another example of the forging pressure processing device according to the present invention.

FIG. 19 is a diagram showing a side surface of FIG. 18.

FIG. 20 is a graph showing the relationship between the rotation angle of the crankshaft and the load torque.

FIG. 21 is a schematic diagram of the structure of a speed reducer.

FIG. 22 is a view showing another example of the forging pressure processing device according to the present invention.

FIG. 23 is a diagram showing a side surface of FIG. 22.

FIG. 24 is an explanatory diagram of a forging pressure processing situation.

FIG. 25 is an explanatory diagram of a forging pressure processing situation.

FIG. 26 is an explanatory diagram of a forging pressure processing situation.

[Explanation of symbols]

1a Anvil 1b Anvil 2 Main frame 2a Guide 3 Subframe 4 Crankshaft 5a Link 5b Link 6 Positioning cylinder 6a Head side oil chamber 6b Rod side oil chamber 7 Positioning cylinder 7a Head side oil chamber 7b Rod side oil chamber 8a Hydraulic oil flow path 8b Hydraulic oil flow path 8c Hydraulic oil flow path 8d Hydraulic oil flow path 9 Bypass path 10 Pilot check valve 11 Pan lot check valve 12 Balance cylinder 13 Displacement meter 14 Displacement meter 15 Flow control valve 16 Flow control valve 17 Relief valve 18 Relief valve 19 Pressure detector 20 Pressure detector 21 Pilot check valve 22 Pilot check valve 23 Pilot check valve 24 Pilot check valve 25 Return circuit 26 Return circuit 27 Second bypass circuit 28 Pilot check valve 29 Pilot check valve 30 Braking device 31 Reducer 32 Drive source T Tank port Pressure port C switching valve P ₁ small capacity pump D Drain

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Fujimura 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama Prefecture (no address) Kawasaki Steel Co., Ltd. Mizushima Works (72) Inventor Koichi Kushida 1-shima-shima Kawasaki, Kurashiki-shi, Okayama Chome (No house number) Kawasaki Steel Co., Ltd., Mizushima Steel Works (72) Inventor ▲ Yoshi ▼ Yoshio Motoo Mizushima Kawasaki Dori, Kurashiki City, Okayama Prefecture (No house) Kawasaki Steel Co., Ltd. Mizushima Steel Works (72) Inventor Inoue Kimei 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama Prefecture (No house number) Kawasaki Steel Works, Ltd. Mizushima Works (56) References JP-A-2-70363 (JP, A) JP-A-63-132759 (JP, A) Special Kai 63-149036 (JP, A) JP 37-17300 (JP, B1)

Claims (11)

(57) [Claims] 1. A slab strand drawn from a continuous casting mold is sandwiched from two opposing surfaces, and the slab strands are repeatedly approached and separated from each other, and continuous forging is performed in the final solidification region of the slab strand during drawing movement. An apparatus having a pair of anvils to be applied, wherein one of the anvils is fixedly held on a mainframe, and the other anvil is fixedly held on a subframe movable along a guide of the mainframe. Are connected to the crankshafts that guide the reciprocating motions of the anvils toward and away from each other via links, and a positioning cylinder that adjusts the distance between the anvils is arranged between each link and the anvil. The rod-side oil chamber and the head-side oil chamber of the positioning cylinder are connected by a hydraulic oil flow path having a switching valve, and the positioning system is connected. The hydraulic fluid flow path leading to the head-side oil chamber of the Sunda formed by connecting through the bypass path, the continuous forging apparatus of the slab strands, characterized in that. 2. The continuous forging apparatus for cast strand according to claim 1, wherein a pilot check valve is arranged in the bypass path. 3. The continuous forging apparatus for cast strand according to claim 1, wherein the subframe is provided with a balance cylinder for preventing the rod of the positioning cylinder from moving. 4. The continuous forging apparatus for cast slabs according to claim 1, wherein the positioning cylinder is provided with a displacement gauge for measuring the amount of displacement of the rod of the cylinder. 5. The continuous forging apparatus for cast strand according to claim 1, wherein a flow rate control valve is provided in a hydraulic oil flow passage communicating with the oil chamber on the head side of the positioning cylinder. 6. The continuous forging apparatus for cast slab strands according to claim 1, further comprising a relief valve provided between a hydraulic oil flow passage communicating with the head side oil chamber of the positioning cylinder and a hydraulic oil flow passage communicating with the rod side oil chamber. . 7. The hydraulic oil return circuit having a pilot check valve is provided between a hydraulic oil flow path communicating with the head side oil chamber of the positioning cylinder and a hydraulic oil flow path communicating with the rod side oil chamber. Continuous forging device for slab strands. 8. The continuous cast forging apparatus for cast slabs according to claim 1, wherein the hydraulic oil flow paths communicating with the rod-side oil chambers of the respective positioning cylinders are connected to each other via a second bypass path. 9. The continuous forging apparatus for cast slabs according to claim 8, wherein a pilot check valve is provided in the second bypass path. 10. The continuous forging apparatus for a cast strand according to claim 1, further comprising braking means for braking the reciprocating motions of the anvil toward and away from each other. 11. The continuous forging apparatus for a cast strand according to claim 1, comprising at least two sets of anvils at different forging start times.