JPH0470082B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a method for feeding a raw pipe in a cold pilgam mill, which is one type of cold rolling of pipes. [Prior Art] As shown in FIG. 1, the conventional method for feeding blank tubes involves mechanically extracting driving force from a main drive section 2 that drives a roll stand 1 using a gear transmission 3 or the like, and then transmitting the driving force to a line shaft 4, The feed screw shaft 19 screwed into the feed carriage 7 is rotated through the transmission 5, and the feed screw shaft 19, which is biased in the backward direction (cam side) by the spring 32, is rotated by the feed cam 6. The feed carriage 7 is moved backward in synchronization with the forward movement of the feed carriage 7 by 19 to obtain a stopped state of the blank tube 13 in the rolling section, and in the idle section, the feeding movement is combined with the forward movement of the feed carriage 7. . [Problems to be Solved by the Invention] However, in such conventional methods, power is mechanically extracted from the main drive part and fed through intermittent motion, so the gear transmission 3 and the line shaft 4. There were many mechanical parts such as the transmission 5 and the feed cam 6, which made maintenance difficult. Furthermore, when changing the feed amount, the feed device must be disassembled and the cam replaced, and due to its nature, the feed amount cannot be determined steplessly. This invention was devised in view of the above-mentioned circumstances, and its purpose is to simplify the mechanism and simplify the setting of the feed amount by numerically controlling the feeding of the raw tube instead of mechanically. The purpose of the present invention is to provide a method for feeding raw pipes that can be easily maintained and managed, and can contribute to weight reduction and cost reduction. [Means for Solving the Problems] The present invention includes a detector provided in a main drive unit that reciprocates a roll stand that rolls a blank pipe, and a drive unit that is separate from the main drive unit and that is a feeder. A feed device is provided with a feed screw shaft coupled to a feed carriage so that the carriage is continuously fed and moved, a rotary motor for feeding and operating the feed screw shaft, and a cylinder portion that connects a base tube to the feed carriage. The feed device is controlled by a numerical control device consisting of a detector, a controller into which data from each of these detectors is input, and a setting device that can steplessly instruct the feed amount to this controller. This is an operation control method that uses idle section and rolling section information recognized from the roll rotation position from a detector in the main drive section, motor rotation speed, piston movement amount of the cylinder section, and piston from a feed device detector. Information on the movement direction and the feed amount instruction value from the setting device are input into the controller, and then these input values are compared inside the controller. During the idle period, the forward movement of the feed carriage and the forward movement of the piston in the cylinder section are controlled. The raw tube is fed until the combined feed amount with the movement matches the set feed amount of the raw tube, and in the rolling section, the piston of the cylinder section is moved backward in synchronization with the forward movement of the feed carriage. It is characterized by stopping the amount of tube feed. [Function] With this configuration, the present invention allows the feed screw shaft to be fed by a motor which is a drive unit different from the reciprocating drive unit of the roll stand, to continuously feed the feed carriage, and to feed the feed carriage in an elementary manner. In the rolling section, the feed of the cylinder section that connects the pipes is controlled backward in synchronization with the forward movement of the carriage, and in the idle section, the combined movement amount of the forward movement of the feed carriage and the forward movement of the cylinder section is set. The cylinder part is controlled to move forward so as to match the feed amount, and the raw tube of the cold pill mill is fed. [Embodiments] The present invention will be explained below with reference to embodiments illustrated in FIGS. 2, 3, 4, 5, 6, and 7. Components that are the same as those in the conventional example are given the same reference numerals and their explanations will be omitted. Cold Pilga Mill 8 is Roll Stand 1
, a main drive unit 2 for reciprocating the roll stand 1, a mandrel chuck 9, an inlet chuck 10, an outlet chuck 11, a rotation drive unit 12 for rotating these, and a device 14 for feeding the raw pipe 13. It is made up of And feeding device 1
4 is controlled by a numerical control device 15. The feeding device 14 includes a motor 16 and this motor 1.
Reducer 17 provided on output shaft 16a of 6
, a gear train 18 provided on the output shaft 17a of this reducer 17, and this gear train 18.
It consists of a feed screw shaft 19 provided on the output shaft of the feed screw shaft 19, a feed carriage 7 into which the feed screw shaft 19 is screwed, and a cylinder portion 20 provided on the feed carriage 7. (See Figure 3)
Incidentally, the feed screw shaft 19 may be one in which the screw shaft is screwed into the rotating shaft portion of the gear, and the tip of the screw shaft is fixed to the feed carriage. The numerical control device 15 includes a controller 21 that sends operation signals to the motor 16 and the cylinder section 20, a setting device 22 that instructs the controller 21 to feed amount, and a controller 21 that sends operating signals to the motor 16 and the cylinder section 20, and a setting device 22 that instructs the controller 21 to control the feed amount. The controller 2 controls each operating state of the motor 23 and crankshaft 24).
Detectors 25, 26, 27 that feed back to 1
It is made up of. (See FIG. 4) In the cold pill mill 8, as shown in FIG. 1 in the circumferential direction of the mold 31A
A portion is cut out to serve as an idle section where the raw tube 13 passes directly between the rolls 31, 31, and another portion is used as a rolling section where the raw tube 13 is stretched and rolled when it passes through the groove 31A. The main motor 23 of the main drive section 2 rotates the crankshaft 24 to move the roll stand 1 forward and backward. In the rolling section, the raw tube 13 is in a stationary state in which it is not relatively fed due to the backward movement of the cylinder section 20 during the feed operation of the feed carriage 7, and the pinion 29 attached to the roll shaft 28 is placed on the frame (not shown). The rack 30 rotates the rolls 31, 31 (approximately 300°) to elongate and roll the raw pipe 13. In the idle section, the blank tube 13 is sent forward by the feeding operation of the feed carriage and the forward movement of the cylinder section 20, and is also sent forward passing directly between the rolls 31, 31. The raw tube 13 is fed by detecting the positions of the rolling section and the idle section of the rolls 31 from the crank angle, and controlling the operation of the feeding device 14 based on the output signal from the numerical control device 15 based on this. The operating state of the feeding device 14 will now be explained with reference to FIG. The rotation of the motor 16 rotates the feed screw shaft 19 via the reducer 17 and gear train 18. Since the feed screw shaft 19 is screwed into the feed carriage 7, the feed carriage 7 usually moves forward toward the roll 31 at a constant speed. At this time, it is necessary to keep the blank tube 13 relatively stationary in the rolling section and feed it only in the idle section. Therefore, the piston (not shown) of the cylinder portion 20 is
In the rolling section of the rolls 31, the feed carriage 7
The raw pipe 13 is brought to a stopped state by being moved at the same speed in the opposite direction to the feeding direction. And the raw pipe 1 in Figure 6
3. As is clear from the time-position diagram of the feed carriage 7 and the cylinder section 20 within one cycle, in the idle section, the forward movement of the feed carriage 7 and the forward movement of the piston of the cylinder section 20 combine to 13 by a predetermined set amount. Note that the rotation speed of the motor 16 is determined so that the feed carriage 7 advances by the set feed amount during one cycle. Factors input to the controller 21 and their contents,
Further, the specific numerical values are as shown in Table 1 below. The operating state of the numerical control device 15 that controls the operation of the feeding device 14 will be explained with reference to FIG.

〔Effect of the invention〕

The present invention has the above configuration and has the following effects. A motor, which is a drive unit that is separate from the reciprocating drive unit of the roll stand, feeds the feed screw shaft to continuously feed the feed carriage, and the cylinder unit that connects the raw pipe to this feed carriage is fed in the rolling section. The backward movement of the carriage is controlled in synchronization with the forward movement of the carriage.
In the idle section, the cylinder section is controlled forward so that the combined movement of the forward movement of the feed carriage and the forward movement of the cylinder section matches the set feed amount of the raw tube, so it is more mechanical than the conventional main drive section. Compared to a system that extracts power and performs feeding via intermittent motion, mechanical parts such as the gear transmission 3, line shaft 4, transmission 5, and feeding cam 6 can be omitted, improving maintainability. can. Further, changes in rolling conditions can be automatically performed only by specifying set values, and the set values can be determined steplessly.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing a conventional cold pill mill, Figure 2 is a schematic diagram showing a cold pill mill using the numerical control device of the present invention, and Figure 3 is a schematic diagram showing a cold pill mill using the numerical control device of the present invention.
4 is a schematic diagram showing the numerical control device that controls the feeding device, FIG. 5 is an explanatory diagram of the roll, and FIG. 6 is a diagram showing the raw pipe, the feeding carriage, The time-position diagram within one cycle of the cylinder section, FIG. 7 is a configuration diagram of the numerical control device. 1...Roll stand, 2...Main drive unit, 3...
...Gear transmission, 4...Line shaft, 5...
Transmission device, 6...Feeding cam, 7...Feeding carriage, 8...Cold pill mill, 9...Mandrel chuck, 10...Inlet chuck, 11...
Outlet chuck, 12...Rotary drive unit, 13...Main pipe, 14...Feeding device, 15...Numerical control device,
16...Motor, 16a...Output shaft, 17...Reducer, 17a...Output shaft, 18...Gear train, 19...Feed screw shaft, 20...Cylinder part,
21... Controller, 22... Setting device, 23... Main motor, 24... Crankshaft, 25, 26, 27...
...Detector, 28...Roll shaft 29...Pinion,
30...Rack, 31...Roll, 32...Spring.

Claims (1)

[Claims] 1 A detector 27 provided in a main drive unit 2 that reciprocates the roll stand 1 that rolls the raw pipe 13 and a feed carriage 7 that is a separate drive unit from the main drive unit 2 that continuously A feed screw shaft 19 coupled to the feed carriage 7 for movement, a rotary motor 16 for feeding and operating the feed screw shaft, and a base tube 13 are provided in a feed device 14 having a cylinder portion 20 coupled to the feed carriage 7. Detectors 25 and 26, and each of these detectors 25,
Controller 21 into which data from 26 and 27 are input
and a setting device 22 that can steplessly instruct the feed amount to the controller 21.
This is a method of controlling the operation of the feeding device 14, in which idle section and rolling section information recognized from the roll rotation position from the detector 27 of the main drive section 2 and information from the detectors 25 and 26 of the feeding device 14 are used. Information on the rotation speed of the motor 16, the piston movement amount and piston movement direction of the cylinder section 20, and the feed amount instruction value from the setting device 22 are input into the controller 21, and then these input values are compared inside the controller. However, in the idle section, the raw pipe is fed until the combined feed amount of the forward movement of the feed carriage 7 and the forward movement of the piston of the cylinder section 20 matches the set feed amount of the raw tube, and in the rolling section, the feed carriage 7. A method for feeding raw tubes in a cold pilgam mill, characterized in that the amount of feed of the raw tubes is stopped by causing the piston of the cylinder portion 20 to move backward in synchronization with the forward movement of step 7.