JP2002001403A - Punching apparatus for centering machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable adjusting a hole length of the top end punch for each billet so as to obtain a most suitable engagement. SOLUTION: A top end punching apparatus of centering machine provided with a clamping apparatus 4 to clamp the top end section of the billet 1 placed in one-way side of the roller table 2 on which a billet 1 is mounted, and a top end punch 5 to open a punch hole in an axial position of the top end surface of the billet 1 whose top end section is clamped by the clamping apparatus 4. A detection sensor 5c to detect a traveling distance of the top end punch 5 is provided. Accordingly, a top end punch hole can be opened go as to obtain the most suitable engagement for the targeted billet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching device for a centering machine for punching a hole at the center of the front or rear end of a billet used in a facility for manufacturing a seamless steel pipe.

[0002]

2. Description of the Related Art In general, a seamless steel pipe is heated in a heating furnace to a billet which is a material of the pipe, and a punching hole is formed in a centering machine at the center of the front or rear end using a front or rear end punch. After the opening, the billet is manufactured by extending the billet in the axial direction with a piercer mill, and at the same time, drilling a hole extending in the axial direction from the tip side at the center of the shaft where the punch hole is provided.

As described above, if a punch hole is made before drilling with a piercer mill, the punch hole formed on the tip surface improves the biting property of the pierther mill, prevents misrolling, and improves uneven thickness at the tip portion. On the other hand, it is said that the punch hole formed in the rear end face has an effect of improving the uneven thickness of the rear end portion.

[0004]

However, if the length of the punch hole at the end punched by the centering machine as described above is too long for the target billet, the biting property is too good and the piercer mill is not used. At the time of perforation, the tip of the billet spreads like a trumpet, and the tip of the piercer mill becomes clogged. Conversely, if the length of the leading end punch hole is too short for the target billet, the effect of improving the biting performance is small, and the roll is misrolled without being bitten.

[0005] Although such a problem can be solved by selecting and using a punch fitting most suitable for the target billet,
In order to replace the punch fitting with an optimum punch fitting each time according to the target billet, a setup change time for replacing the punch fitting is required separately, and the work efficiency is reduced.

[0006] In addition, the opening of the punch hole using the rear end punch is formed by fixing the tip of the billet with a die as described in the section of the problem to be solved by the invention of Japanese Patent Application Laid-Open No. 1-278901. Since a punch hole is formed at the rear end of the billet, there is also a problem that the billet buckles when the billet is elongated.

Further, under the present circumstances, when punch holes are made in the front and rear ends of the billet by the leading and trailing punches, slipping occurs on the die at the clamp portion of the leading end of the billet and the punch holes are opened. If this was not possible, there was no means to detect this.

The present invention has been made in view of the above-mentioned circumstances, and it has been made possible to adjust the length of a punch hole at the tip according to a billet so as to obtain an optimum biting property. Even if there is no buckling, the pressing pressure of the rear end punch can be adjusted, or
It is an object of the present invention to provide a punching device for a centering machine that can detect slippage of a billet tip on a die in order to be able to determine whether or not a punch hole has been properly opened.

[0009]

In order to achieve the above-mentioned object, a tip punch device of a centering machine according to the present invention is provided with a sensor for detecting a moving amount of the tip punch. By doing so, it is possible to form a tip punch hole having an optimum length according to the target billet.

Further, in the rear end punch device of the centering machine according to the present invention, when the rear end punch is pressed against the center of the rear end face axis of the billet to form a punch hole, the pressing pressure of the rear end punch is adjusted to the diameter and length of the billet. Now, it is configured to be adjustable depending on the material. By doing so, buckling can be effectively prevented even when the billet is elongated.

In the punching device for a centering machine according to the present invention, when a punch hole is made by pressing a leading end punch and a trailing end punch on the axial center position of the leading end surface or the trailing end surface of the billet, respectively, A sensor for detecting the amount of movement of the punch is provided. By doing so, it is possible to detect the slip of the billet tip on the die.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tip punching device of a centering machine according to the present invention is disposed on one side of a table on which a billet is placed, and clamps the tip of the billet. In a tip punch device of a centering machine provided with a tip punch for punching a punch hole at a center position of a tip face axis of the billet whose part is clamped, a sensor for detecting a moving amount of the tip punch is provided.

In the tip punch device of the centering machine according to the present invention, since a sensor for detecting the amount of movement of the tip punch is provided, the target punch can be obtained without changing the tip punch each time, so that optimum biting performance can be obtained. A punch hole at the tip of the optimum length according to the billet can be formed.

When the punch is pressed against the center of the axis of the tip surface of the billet to form a punch hole, the pressing force of the tip punch can be adjusted according to the diameter and material of the billet. The controllability at the time of opening the used punch hole is improved.

Further, a rear end punch device of a centering machine according to the present invention is disposed on one side of a table on which a billet is placed, and a clamp device for clamping a front end portion of the billet; A rear end punch device of a centering machine provided with a rear end punch arranged on the other side of the table to form a punch hole at a center position of a rear end surface axis of the billet clamped with the rear end punch. When a punch hole is made by pressing the punch to the center position, the pressing pressure of the rear end punch can be adjusted according to the diameter, length and material of the billet.

In the rear end punch device of the centering machine according to the present invention, when the rear end punch is pressed against the center of the rear end face axis of the billet to form a punch hole, the pressing pressure of the rear end punch is adjusted by the diameter and material of the billet. Since the configuration is made possible, buckling can be effectively prevented even when the billet is elongated.

Further, a punching device for a centering machine according to the present invention is arranged on one side of a table on which a billet is placed, and clamps a tip of the billet via a die. The billet has a front end punch that punches a punch hole at the center of the front end surface axis of the billet having a front end clamped, and a rear end punch that is arranged on the other side of the table and opens a punch hole at the center position of the rear end surface axis of the billet. In a punching device of a centering machine, when a punch hole is made by pressing the leading end punch and the trailing end punch against the axial center position of the leading end surface or the trailing end surface of the billet, slip on the die at the leading end of the billet is detected. To this end, sensors for detecting the movement amounts of the leading end punch and the trailing end punch are provided.

In the punching device of the centering machine according to the present invention, when punching a punch hole by pressing the leading end punch and the trailing end punch to the axial center position of the leading end surface or the trailing end surface of the billet, respectively, the leading end punch and the trailing end punch are formed. A sensor that detects the amount of movement is provided, so that the slip of the billet tip on the die when opening the punch hole can be detected, and it can be easily determined whether the punch hole opening work was successfully performed. become.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic explanatory view of an embodiment of the present invention, FIG. 2 is a control flow diagram of a front punch hole length, FIG. 3A is a detection flow diagram of whether punching of a rear punch hole is successful or not, (B) is a detection flowchart of whether punching of the tip punch hole is successful or not.

In FIG. 1, reference numeral 1 denotes a billet placed on, for example, a roller table 2, and the die 3 is moved up and down on one side (left side in FIG. 1) of the roller table 2 via the die 3. A clamp device 4 for clamping the front end of the billet 1 is disposed.

Numeral 5 is a tip punch which is arranged opposite to the tip face of the billet 1. The tip punch 5a is replaceable. The tip punch 5a is located at the center of the tip face axis of the billet 1. It is composed of a tip punch device 5b with a pressure adjusting mechanism capable of pressing the billet 1 with an optimum pressure according to the diameter and material of the billet 1, and a sensor 5c for detecting a moving amount of the tip punch device 5b (tip punch metal fitting 5a). Have been.

In this embodiment, the tip punch 5 is disposed inside a push-out device 6 for pushing out the billet 1 after punching a punch hole, and the clamp device 4, the tip punch 5, and the push-out The device 6 is provided on the housing 7. FIG.
Reference numeral 11 denotes a sensor for detecting a push-out position when the billet 1 is extruded by the push-out device 6 after the punch hole is opened.

Reference numeral 8 denotes the other side of the roller table 2 (FIG. 1).
A right-hand side of the drawing), a rear-end punch disposed opposite to the rear-end surface of the billet 1, like the front-end punch 5, a replaceable rear-end punch 8 a, and a rear-end punch 8 a At the center of the rear end face axis of billet 1,
Rear-end punch device 8 with a pressure adjusting mechanism capable of pressing with an optimum pressure according to the diameter, length, and material of billet 1
b and a sensor 8c for detecting the amount of movement of the rear end punch device 8b (the rear end punch fitting 8a).

In the present embodiment, the trailing end punch 8 is mounted on a movable carriage 10 which is guided and moved by a rail 9 provided above the roller table 2, and the billet 1 is moved by the movement of the movable carriage 10. The rear end punch 8 is located at a position corresponding to the length. In addition, 1
Numeral 0a denotes a driving motor for the movable cart.

The punching device of the centering machine according to the present invention has the above-described configuration. When a punching hole is formed in the front and rear ends of the billet 1 using this punching device, the following is performed.

First, the clamp device 4 is operated on the billet 1 placed at a predetermined position on the roller table 2 with reference to the front end side, and the front end of the billet 1 is clamped through the die 3 at a predetermined pressure. I do. After the clamp, the motor 10a is driven based on the length information of the billet 1 to move the movable carriage 10, and the rear end punch 8 is positioned at a predetermined position facing the rear end face of the billet 1.

Next, by operating the rear end punch device 8b and pushing the rear end punch 8a against the rear end face of the billet 1 at a predetermined pressure, the rear end face of the billet 1 is moved to a predetermined center by a predetermined length. A punch hole. Further, by operating the tip punch device 5b and pushing the tip punch fitting 5a against the tip face of the billet 1 at a predetermined pressure, a punch hole having a predetermined length is formed at the center of the tip face axis of the billet 1.

The pushing pressure of the trailing end punch 8 at the time of punching the punch is set to a value not more than the buckling pressure P obtained by dividing the buckling load W by the cylinder sectional area A of the trailing end punch device 8b. Set and do. By punching the rear-end punch hole with such pressure, even when the billet 1 is elongated, buckling does not occur when the punch hole is punched.

As shown in FIG. 2, the pushing amount of the tip punch fitting 5a at the time of punching is set by a table 13 previously obtained based on billet information 12 such as the diameter and material of the billet 1. If the control value and the value detected by the sensor 5c are within, for example, ± 5 mm, the driving of the leading punch 5 is stopped, and if the detected value is not within ± 5 mm, the driving of the leading punch 5 is continued.

Whether the punching operation of the punch at the rear end as described above has been successfully performed is determined by, for example, detecting the sensor 8c of the punch 8 at the rear end and the push-out position when the billet 1 is extruded. This is performed by comparing the sensor 11 as shown in FIG. Whether or not the punching operation of the punch at the front end portion has been successfully performed is determined by, for example, the sensor 5c of the front punch 5 and the sensor 8c of the rear punch 8 in the low pressure state shown in FIG. The comparison is performed as described above.

That is, whether or not the punching operation of the punch at the rear end portion has been successfully performed is determined by the moving position of the rear end punch 8 before the punching of the rear end punch 8 detected by the moving distance of the movable carriage 10; The position of the trailing end punch 8 after the punching of the trailing end punch 8 detected by the sensor 8c is compared, and it is determined whether or not these differences are, for example, 45 to 50 mm or more. The front push-out position is compared with the push-out position during punching of the trailing end punch 8 detected by the sensor 11, and based on the determination as to whether or not these differences are, for example, ± 10 mm or more, the following is performed. Do it.

First, if the answer is YES and the answer is NO, it is determined that the hole punching operation by the rear end punch has been successfully performed. Conversely, if the answer is NO and either or both are YES, the drilling operation using the rear-end punch is not performed well, and it is determined that the drilling operation is unsuccessful.

Whether or not the punching operation of the punch at the distal end portion has been successfully performed is determined by the amount of pushing of the punch 5 set as described above and the punch after the punching of the punch detected by the sensor 5c. 5 are compared to determine whether the difference between them is, for example, 5 mm or more, the position of the trailing end punch 8 before drilling the leading end punch, and the moving position of the trailing end punch 8 during drilling of the leading end punch. Are compared, and based on the determination as to whether or not the difference between the two is, for example, 10 mm or more, is performed as follows.

First, if both are NO, it is determined that the hole punching operation with the tip punch has been successfully performed.
Conversely, if either or both are YES, the punching operation using the leading end punch is not performed well, and it is determined that the hole punching operation is not successful.

Then, the leading end punch 5 or the trailing end punch 8
When it is determined that the drilling operation by the drilling operation is not performed well and the operation is unsuccessful, the pressurizing pressure set value in the clamp device 4 is increased by a predetermined ratio from the previous value, and the pressure setting is adaptively corrected. A punching operation of the leading end punch hole and the trailing end punch hole is performed, and the result is adaptively corrected in the next billet 1 of the same size and the same material.

Further, among the failure results of the tip punch 5, if the moving position of the tip punch 5 after punching the tip punch hole has not reached the set pushing amount of the tip punch 5, the next time In the case of the billet 1 of the same size and the same material, the pressure setting value of the tip punch device is adaptively corrected so as to be set slightly higher.

The pushing amount of the tip punch 5 is shown in FIG.
Is determined by the billet information 12 as shown in FIG. 2, and the value is adaptively corrected as shown in FIG. 2 based on the result of the biting failure by the piercer mill.

For example, misroll information 1 in a pierther mill
If 4 is too much bite, 1 is added to the original a.
On the other hand, when the misroll information 14 in the pierther mill is insufficiently bitten, 1 is added to the original b. And a-b
Is larger than X or smaller than -X. If larger than X, the pushing amount of the leading end punch 5 is made smaller by a predetermined rate than the previous pushing amount. Conversely, a-b
Is smaller than -X, the pushing amount of the tip punch 5 is increased by a predetermined rate from the previous pushing amount.

In the present embodiment, the pressing force of the leading end punch 5 and the trailing end punch 8 can be adjusted steplessly. However, the pressing force set in several steps may be switched.

[0040]

As described above, in the tip punch device of the present invention, the tip having the optimum length according to the target billet is obtained so that the optimum biting property can be obtained without replacing the tip punch each time. Punch holes can be opened. And, when the tip punch is pressed against the center of the tip surface axis of the billet to form a punch hole, if the pressing pressure of the tip punch can be adjusted by the diameter and material of the billet, the tip punch is used. The controllability at the time of opening the punch hole is improved.

Further, in the rear end punch device of the present invention, by arranging the pressing pressure of the rear end punch so that it can be adjusted by the diameter and material of the billet, buckling occurs even when the billet is elongated. It can be effectively prevented.

Further, in the punch device of the present invention, when the punch is opened by pressing the leading punch and the trailing punch against the axial center of the leading or trailing surface of the billet, respectively, the amount of movement of the leading and trailing punches is increased. Of the billet tip on the die when punching a punch hole can be detected, and it can be easily determined whether or not the punch hole opening work has been successfully performed. .

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram of an embodiment of the present invention.

FIG. 2 is a control flowchart of a tip punch hole length.

FIG. 3A is a flowchart of detecting whether the punching of the trailing end punch hole is successful or not, and FIG. 3B is a flowchart of detecting whether the punching of the leading end punch hole is successful or unsuccessful.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Billet 2 Roller table 3 Dice 4 Clamping device 5 Tip punch 5c Sensor 8 Trailer punch 8c Sensor

Claims (4)

[Claims] 1. A clamp device which is disposed on one side of a table on which a billet is placed and clamps a tip portion of the billet, and a clamp device which clamps a tip portion of the billet at a center position of a tip surface axis of the billet. A tip punch device for a centering machine, comprising a tip punch device for a centering machine provided with a tip punch for punching a punch hole, wherein a sensor for detecting a movement amount of the tip punch is provided, and a punch hole depth can be automatically adjusted. 2. The pressure of the leading edge punch is adjustable by the diameter and material of the billet when the leading edge punch is pressed against the center of the billet tip surface axis to form a punch hole. 2. A tip punch device of the centering machine according to 1. 3. A clamp device which is disposed on one side of a table on which a billet is placed and clamps a front end portion of the billet, and a punch is provided at a center position of a rear end surface axis of the billet whose front end portion is clamped by the clamp device. In a rear-end punch device of a centering machine having a rear-end punch arranged on the other side of the table to make a hole,
A centering machine characterized in that when a rear end punch is pressed against the center of the rear end face axis of the billet to form a punch hole, the pressing pressure of the rear end punch can be adjusted according to the diameter, length, and material of the billet. Rear end punch device. 4. A clamp device which is arranged on one side of a table on which a billet is placed and clamps a tip portion of the billet via a die, and a tip surface of the billet whose tip portion is clamped by the clamp device. A punch device for a centering machine, comprising: a tip punch for punching a punch hole at the center of the shaft; and a rear punch disposed on the other side of the table and punching a punch hole at the center of the rear end surface of the billet. When punch holes are made by pressing the punch and the rear end punch against the axial center of the front end face or the rear end face of the billet, the amount of movement of the front end punch and the rear end punch to detect slippage of the front end of the billet on the die. A punching device for a centering machine, comprising a sensor for detecting each of the following.