JPH0611444B2 - Pipe cutting equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device for pipe material such as a steel pipe, and a pipe is cut by shearing while a core metal is inserted into the pipe to prevent the pipe from being crushed. The present invention relates to a device having a structure for cutting.

-Prior Art-A device for inserting two cored bars into a pipe to be cut and applying a shearing force to the pipes at the abutting portions of both cored bars to cut the pipe is disclosed in, for example, Japanese Patent Laid-Open No. 51- It is known as disclosed in Japanese Patent No. 114786.

-Problems to be Solved by the Invention-However, the conventional apparatus of this type has a problem that the structure is complicated and the operation cycle is slow, or a step of removing the core metal from the cut-off pipe is required. It was This type of pipe cutting device is often used when cutting short workpieces one after another from long pipes with a relatively small diameter, and requires a device with a simple structure capable of fast cycle time and high speed operation. Has been done.

The present invention has been made in view of the above requirements, and an object thereof is to provide a device having a simple structure and a fast cycle time, which is used when cutting a pipe having a relatively small diameter into a certain length.

-Means for Solving the Problems-As shown in FIG. 1, the device of the present invention is applied to a moving die 3 and a fixed die 2 which apply a shearing force from the outer peripheral surface of the pipe 1, and a pipe to be cut. A short cylindrical floating core metal 4 fitted so as not to easily move, and a feeding device 4
1 (see FIG. 5), a guide sleeve 6 for abutting and positioning the end face of the pipe 1 and a drive core bar axially reciprocatingly inserted and removed from the end face of the pipe to its inner diameter. 5, a core metal drive cam 21 that drives the drive core metal 5 back and forth in the axial direction, and a die drive cam 31 that drives the moving die 3 back and forth.

The drive core metal 5 is guided by the guide sleeve 6 so as to be slidable in the axial direction. The core metal drive cam 21 advances the drive core metal 5 until the tip of the drive core metal 5 coincides with the sliding contact surface between the fixed die 2 and the moving die 3 when the core metal drive cam 21 advances, and has a stroke longer than the cutting length of the pipe 1. It is given to the driving core 5. The core metal drive cam 21 allows the drive core metal 5 to be inserted into and removed from the inner surface of the pipe 1 from its end face. The floating cored bar 4 is inserted into the pipe 1 to be cut in advance, and when the drive cored bar 5 advances, it is pushed by the tip of the drive cored bar 5 and moves intermittently. The moving die 3 moves along the sliding contact surface with the fixed die 2 to apply a shearing force to the pipe to cut the pipe. A cutout 14 for discharging the pipe is provided below the fixed quiz 2, and the cut pipe is dropped and discharged through the cutout 14. The die driving cam 31 is mechanically connected to the core driving cam 21 and rotates synchronously, and moves the moving die 3 when the driving core 5 reaches the advance end.

-Operation- According to the above device, the length of the workpiece to be cut is
The tip of the fed pipe comes into contact with the tip of the guide sleeve 6 and stops so that a fixed length is set. After the cutting operation, the drive core metal 5 retreats with a stroke larger than the length of the cut workpiece. The core metal is quickly removed from the cut work piece, the work piece falls through the notch 14 of the fixed diamond, and is quickly discharged to the outside of the apparatus. Further, in the apparatus of the present invention, since the driving core 5 and the moving die 3 are synchronously driven by the cams 21 and 31 mechanically linked to each other, the cycle time can be shortened and high productivity can be realized.

-Embodiment- FIGS. 1 to 5 are views showing an embodiment of the present invention, in which 1 is a pipe to be cut and 2 and 3 are pipes 1.
Fixed and moving dies for receiving the outer peripheral surface of the pipe 1 on both sides of the cutting position A of the above, 4 are floating cores fitted into the inside diameter of the pipe 1, 5 are the inside diameter of the pipe 1 while pushing the awe-inspiring core bar 4. It is a driving core metal that is inserted and removed. The fixed die referred to here is a die that does not move in the direction perpendicular to the axis of the floating core metal 5, and the moving die is the die that moves in the direction perpendicular to the axis of the floating core metal 5. I shall say.

Reference numeral 10 is a base of the apparatus, 12 is a fixed die holder fixed to the base 10, and 13 is a guide frame 11 fixed to the base 10.
It is a movable die holder that is vertically slidable along. The fixed dies 2 and the movable dies 3 are closely attached to each other at their opposing surfaces, and the fixed dies holder 12 and the movable dies holder 13 are attached.
It is fixed to. As shown in FIG. 2, the fixed die 2 has a horseshoe shape, and the cutout 14 forms a discharge path for the cut pipe together with the fixed die holder 12 and the cutouts 15 and 16 provided on the base 10.

Reference numeral 6 denotes a guide sleeve, which is screwed into the fixed die holder 12 and fixed by a lock nut 17, and by loosening and rotating the lock nut 17, the tip end advances and retracts to set the cut length of the pipe 1. The tip of the guide sleeve 6 has an outer diameter and an inner diameter that are substantially equal to those of the pipe 1, and is fitted into the fixed die 2. The driving core 5 is a reciprocating rod 1.
8 is formed integrally with the tip of the guide sleeve 6, and is slidably fitted into the inner diameter of the tip of the guide sleeve 6. Reciprocating rod 18
Is supported by a bearing 19 fixed to a base so as to be slidable in the axial direction, and a cam roller 20 is axially attached to the base end thereof.

Reference numeral 21 denotes a cylindrical cam rotatably supported by a support bracket 22 fixed to the base 10, and a cam roller 20 is fitted in a cam groove 23 of the cylindrical cam. The cylindrical cam 21 has a cam stroke longer than the cut length of the pipe 1, and when the reciprocating rod 18 is advanced (moved to the left end in the figure).
The tip of the driving core metal 5 is exactly the fixed die 2 and the moving die 3.
It is mounted so as to be in a position that coincides with the sliding contact surface with. A chain sprocket 24 is substantially integrally mounted on the cylindrical cam 21.

The movable die holder 13 is urged downward by a compression spring 25, and the lower side of the movable die holder 13 is in contact with the outer peripheral surface of a disc cam 31 fixed to the cam shaft 30. As shown in FIG. 3, a protrusion 32 is formed on the disc cam 31 at one location on the outer periphery thereof, and the movable die holder 13 is moved upward when the protrusion 32 rotates upward. A chain sprocket 34 having the same diameter as the chain sprocket 24 is fixed to the cam shaft 30, and a chain 33 is wound between the two 24 and 34, and is synchronously driven by a drive source (not shown).

A floating core metal 4 as shown in FIG. 4 is fitted into the pipe 1 from its end surface. The floating core metal 4 has an outer diameter that fits exactly into the inner diameter of the pipe 1, and is fitted with an O-ring 40 or the like as appropriate so as not to move easily due to friction with the inner diameter surface of the pipe 1. I'm trying to bring them together. Pipe 1
A feeding device 4 including a pair of rollers as shown in FIG.
It is urged toward the guide sleeve 6 by 1. The feeding device 41 is provided at a sufficient distance so that the vertical movement of the moving die 3 is allowed by the bending of the pipe 1.
Reference numeral 42 denotes a coil around which a pipe is wound, and the pipe 1 is pulled out from the coil and sequentially supplied to the cutting device.

FIG. 1 shows a state where the driving core metal 5 is retracted, and in this state, the tip of the pipe 1 is moved to the moving die 3 and the fixed die 2.
And is fed until the end surface comes into contact with the tip of the guide sleeve 6. When the cam shaft 30 rotates from this state, the driving core metal 5 is first driven by the cylindrical cam 21 and advances, abuts against the base end of the floating core metal 4 and pushes it in, and the tip of the driving core metal 5 is fixed to the fixed die. When it comes to a position that coincides with the sliding contact surface between 2 and the moving die 3, it temporarily stops. Then, during this stop period, the protrusion 32 of the disc cam pushes up the moving die 3 to cut the pipe 1. Drive core 5 is pipe 1
At the timing after the cutting is started, the retreat is started, and the workpiece cut and cut from the pipe 1 is dropped and discharged. Then, the pipe 1 is fed toward the guide sleeve 6 through the moving die 3 that has returned to the original position, and returns to the state of FIG. By repeating this, the pipe 1 is continuously cut into a constant length.

-Effect of the invention-According to the present invention, it becomes possible to cut a pipe such as a steel pipe into a work piece of a constant length at a high speed by shearing, the productivity of the pipe cutting process can be improved, and a cylindrical machine part can be achieved. There is an effect that can be manufactured inexpensively and efficiently.

[Brief description of drawings]

1 to 5 are views showing an embodiment of the present invention.
FIG. 1 is a side view showing a cross section of a main part, FIG. 2 is a perspective view of a fixed die mounting portion, FIG. 3 is a perspective view of a disc cam for driving a moving die, and FIG. 4 is a perspective view of a floating core metal. 5 and 5 are side views schematically showing a pipe supply device. In the drawing, 1: pipe, 2: fixed die 3: moving die, 4: floating core metal 5, drive core metal, 6: guide sleeve 10: base, 11: guide frame 20: cam roller, 21: cylindrical cam 31: Disc cam, 33: Chain A: Cutting position

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kozo Togami 34 I, Katsura-cho, Kanazawa, Ishikawa Prefecture Togami Kikonai Co., Ltd. (56) References JP-A-51-114786 (JP, A)

Claims (1)

[Claims] 1. A driving core metal (5) axially reciprocatingly fitted into a pipe (1) so as not to easily move and pushed by the tip of the driving core metal to intermittently move in the pipe. In a pipe cutting device equipped with a floating cored bar (4), a moving die (3) that applies a shearing force to the outer circumference of the pipe at its cutting position, and a fixed die (2), the pipe is fed from a feeding device (41). Guide sleeve (6) that guides the drive core metal (5) while abutting the end surface of the pipe (1) to be positioned, and the drive core metal
Extend the tip of (5) to the same surface as the sliding contact surface between the fixed die and the moving die, and move the core metal drive cam (21) and the drive core metal (5) that have a retract stroke larger than the cutting length of the pipe. And a die driving cam (31) that moves the moving die (3) in the direction perpendicular to the axis of the pipe (1) when
(21) and the die driving cam (31) are mechanically connected to rotate synchronously, and the fixed die (2) has a notch (14) for dropping the cut pipe, the pipe cutting apparatus.