JPH0811266B2 - Pipe forging equipment - Google Patents

Description

The present invention relates to a pipe forging device.

[Prior Art] Conventionally, in a device for manufacturing a seamless pipe, as shown in Fig. 4, a mandrel c is inserted between a pair of grooved rolls a, a, and a pipe material b is fitted onto the mandrel c. Then, it is fed between the grooved rolls a and a, and the pipe material b is crushed by the grooved rolls a and a to obtain a seamless pipe.

However, in an apparatus for manufacturing a seamless pipe using the grooved roll a, the grooved roll is usually used for the pipe material b.
Since a and a can only be applied with a load of about several hundred tons, in order to manufacture a pipe with high hardness, it is necessary to arrange a large number of grooved rolls a to form a long production line.

Therefore, in order to solve such a problem, there is an apparatus for manufacturing a seamless pipe by inserting a pipe material fitted onto a mandrel from an upstream side into a forging press and pressing the forging press while sequentially feeding the downstream side. Proposed.

[Problems to be Solved by the Invention] However, in the pipe forging device using the above forging press, since the pipe material is forged while being fed in one direction from the upstream side to the downstream side, the end of the pipe material after forging is forged. There has been a problem that the portion (upstream end portion) has a non-uniform deformation of the cross section (the cross section becomes an elliptical shape instead of a perfect circle), or the amount of cropping increases due to a difference in the amount of elongation.

In view of the above-mentioned circumstances, the present invention provides a pipe forging device capable of forging a pipe material in the reciprocating direction so as to prevent uneven deformation of a cross section and an increase in the crop amount generated at the end portion of the pipe material. It is intended to be provided.

[Means for Solving the Problems] The present invention is a forging press in which upper and lower molds having a substantially circular vertical cross section formed in a mating surface and forming a space extending in the line direction are attached so as to be able to approach and separate from each other, and extend in the line direction. In a pipe forging device constituted by a manipulator capable of gripping an end portion of a pipe material having a mandrel inserted in a central portion thereof and sending the pipe material into a die space of the forging press, the manipulator being movable in a line direction,
A pipe forging apparatus is formed by forming tapered narrowed portions at both ends in the line direction of the die and disposing a pair of manipulators on the upstream side and the downstream side of the forging press so as to face each other.

[Operation] Therefore, in the present invention, the upstream end of the pipe material inserted into the forging press is gripped by the upstream manipulator, and the downstream end of the pipe material is gripped by the downstream manipulator, and both manipulators are placed downstream. While moving to the side, forging from the downstream end of the pipe material to the central part to a predetermined diameter using the tapered narrowed part on the upstream side of the die, then moving both manipulators to the upstream side When forging a long pipe, the upstream end of the pipe is forged to a specified diameter by using the tapered tapered part on the downstream side of the mold, so that the upstream end of the pipe has uneven cross-section deformation and cropping amount. Does not occur.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 are explanatory views of an embodiment of the present invention.

A pair of upper and lower sides having a substantially circular vertical cross section on the mating surface and forming a space 1 whose axis (hereinafter referred to as axis) faces in the line direction, and further forming tapered narrowed portions 2 and 3 on both sides of the space 1 in the line direction. The forging press 8 which is formed by connecting the driving devices 6 and 7 for vertically moving the dies 4 and 5 closer to and away from each other is installed on the foundation, and extends in the line direction in the upstream and downstream of the forging press 8. The guide rail 9 is laid, and the front (downstream) manipulator 10a and the rear (upstream) manipulator 10b are arranged on the guide rail 9.

The rear manipulator 10b has the following configuration.
Body with rollers 12 that move along guide rails 9
Carrier cylinder 14 that expands and contracts the upstream side of 13 in the line direction
Motor with a pinion gear 15 inside the body 13
16 is provided, and the operation shaft 17 existing on the axis is rotatably inserted from the forging press 8 side toward the inside of the main body 13 through a bearing 18 provided in the main body 13, and the operation shaft 17 is provided at the inner end of the main body 13 of the operation shaft 17. Mount the gear 19 that meshes with the pinion gear 15 and operate the shaft.
Fix the mounting member 20 to the end of the 17 forging press 8 side,
Tensioning cylinder with rod directed axially downstream to 20
21 is attached, and the tong head 22 is attached to the tensioning cylinder 21, and a pair of tong levers 23, 24 whose tip extends toward the forging press 8 at the forging press 8 side end of the tong head 22 and at a symmetrical position with respect to the axis. An intermediate portion is rotatably pivoted by pins 25, 26 extending in a tangential direction of a circle centered on the axis, and an opening / closing cylinder 27 is provided at the rear ends of both tong levers 23, 24.
Are connected.

The front manipulator 10a is arranged to face the rear manipulator 10b with the tongue levers 23 and 24 facing upstream, and the motor 16 and the pinion gear 15 are arranged to follow the rear manipulator 10b.
And without a gear 19, instead of a forward manipulator
The tongue head 22, the operating shaft 17, and the manipulator body 13 are provided in the manipulator body 10a so that one end of a mandrel 31 having a collar 30 at the downstream end inserted in the insertion hole 29 of the pipe material 28 can be movably supported. Through-holes 32 are provided in the respective axial center portions, and bushes 33 are provided in the through-holes 32. Needless to say, the opening / closing cylinder 27 is arranged at a position where it does not interfere with the through hole 32 as shown in FIG.

Next, the operation will be described. First, the mandrel 31 is inserted into the insertion hole 29 of the pipe material 28 until the collar 30 hits, and the end (upstream end) of the pipe material 28 in which the mandrel 31 is inserted operates the opening / closing cylinder 27. Then rear manipulator 10b tong lever 2
Hold at 3,24.

After gripping the pipe material 28 with the rear manipulator 10b,
The carrier cylinder 14 is extended to move the rear manipulator 10b to the downstream side, and the tip (downstream side end) of the mandrel 31 protruding from the pipe material 28 is a space 1 between the dies 4 and 5 of the forging press 8.
The manipulator 15 is further advanced by inserting the mandrel 15 into the through hole 32 of the front manipulator 10a so that the tip of the mandrel 31 is penetrated and supported, and the tip of the pipe material 28 (downstream side end) is made into a mold 4,
Set between 5

After setting the pipe material 28 in the forging press 8, first,
Drives the forging press 8 and tapers the squeezed parts 2, 2 of the dies 4, 5.
Is used to mold the tip of the pipe material 28. At this time, in order to uniformly form the pipe material 28 in the circumferential direction, the motor 16 of the rear manipulator 10b is intermittently driven to rotate the pipe material 28.

When the tip of the pipe material 28 is forged into a predetermined diameter,
The front manipulator 10a is moved to the forging press 8 side by a required amount so that the tip portion is moved to the tongue levers 23, 24 of the front manipulator 10a.
Grip with the tensioning cylinder 2 of each manipulator 10a, 10b.
A pressure oil is applied to 1,21 to give a contracting force and give a tension to the pipe material 28. When tension is applied to the pipe material 28 in this manner, the forging press 8 is driven again to move both manipulators 10a and 10b forward to feed the pipe material 28 to the downstream side and forge it.
The forging process is similarly performed up to the center of 28.

Next, when the forging process is completed up to the center of the pipe material 28, open the tongue levers 23, 24 of the rear manipulator 10b to release the pipe material 28, move the front manipulator 10a to the downstream side, and use the tong levers 23, 24. The gripped pipe material 28 is moved to the downstream side of the forging press 8, and the end portion of the pipe material 28 is set between the molds 4 and 5.

After setting the pipe material 28, the forging press 8 is driven to form the end portion of the pipe material 28 by using the tapered drawing portions 3 and 3 of the molds 4 and 5, and the rear manipulator 10b is forged by the forging press 8.
Grip the end portion of the pipe material 28 that has been moved to the side with the tong levers 23 and 24, apply pressure oil to the tension applying cylinders 21 and 21 of the manipulators 10a and 10b to apply tension to the pipe material 28, Driving the forging press again, both manipulators 10a, 10b
Is moved rearward to feed the remaining portion of the pipe material 28 to the upstream side and similarly perform molding to manufacture a pipe.

When the pipe material 28 is forged from both ends in this way, non-uniform deformation of the cross section of the forged pipe material 28 at the end portion and an increase in the crop amount are prevented, and the yield of the manufactured pipe is improved.

The present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the scope of the present invention.

[Effects of the Invention] As described above, according to the pipe forging device of the present invention,
By providing tapered squeezing parts at both ends of the die in the line direction and being positioned opposite to both sides of the manipulator forging press, it becomes possible to stretch the pipe material to both ends, and the pipe material end part has a non-uniform cross-section deformation. Also, since the amount of crop does not increase, various excellent effects such as the production of a good pipe can be achieved.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, and FIG. 2 is a view of FIG.
II-II arrow view, FIG. 3 is a III-III arrow view of FIG. 1, and FIG. 4 is an explanatory view of a conventional example. In the figure, 1 is a space, 2 and 3 are drawing parts, 4 and 5 are molds, 8 is a forging press, 10a is a front manipulator, 10b is a rear manipulator,
28 is a pipe material, 29 is an insertion hole, and 31 is a mandrel.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuo Watanabe 1-1-1 Edamitsu, Yawatahigashi-ku, Kitakyushu, Fukuoka Prefecture Inside the 3rd Technical Research Laboratory, Nippon Steel Corp. (72) Inventor Takeshi Kawakami Kanda, Chiyoda-ku, Tokyo 3-6 Nishikicho Japan Oil Tool Co., Ltd. (56) Reference JP-A-60-92033 (JP, A) JP-A-63-180337 (JP, A) JP-A-63-309347 (JP, A) JP JP-A-63-248535 (JP, A) JP-A-55-54195 (JP, A) JP-A-63-160738 (JP, A)

Claims (1)

[Claims] 1. A forging press in which upper and lower molds having a substantially circular vertical section on a mating surface and forming a space extending in a line direction are attached so as to be able to approach and separate from each other, and a pipe material having a mandrel extending in the line direction inserted in a central portion thereof. In the pipe forging device, which is composed of a manipulator capable of gripping an end portion of the pipe material and sending the pipe material into a die space of the forging press, the manipulator being movable in a line direction,
A pipe forging apparatus, characterized in that tapered squeezed portions are formed at both ends of the die in the line direction, and a pair of manipulators are arranged to face each other on the upstream side and the downstream side of the forging press.