JPS5918182B2 - Pipe end automatic cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic tube end cutting device that enables optimal tube end cutting during a tube manufacturing process.

The details will be explained below using a seamless steel pipe as an example.

Normally, seamless steel pipes are straightened with a straightener after the rolling process, and then the pipe ends are cut.

At this time, since there is conventionally no quick method for measuring the wall thickness of the cut portion at the tube end, the cutting length from the tube end is determined by the intuition of the operator.

Therefore, it is not possible to cut according to changes in the wall thickness of the tube end, resulting in insufficient or over-cutting. If the cutting is insufficient, the re-cutting process will increase due to poor thinness at the tube end, and if too much is cut, the yield will be reduced. The production efficiency of steel pipes is lowered due to
There was a drawback.

The present invention has a fully automatic control circuit that can quickly measure and cut the optimum cutting position of the tube end.The apparatus will now be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which a stopper 3 equipped with a load cell 2 is provided at the pipe end abutting portion where the steel pipe 1 conveyed to the cutting process is to be stopped, and a stopper 3 equipped with a load cell 2 is provided near the stopper 3. Attaching the steel pipe 1 is a floodlight 4 that detects whether the position is good or bad.
and a phototube 5, and the phototube 5 is interlocked and connected to the load cell 2 via a timer 6.

Reference numeral 7 denotes a chuck, which supports the steel pipe 1 in response to a signal from the phototube 5 in a manner that allows the steel pipe 1 to be attached/detached and rotated freely, thereby providing an automatic tube support control device C1.

Further, position transmitters 9, 9 are placed oppositely at the tips of a pair of speed-adjustable rods 8, 8, which move forward and backward at the same speed in the axial direction of the tube, with one entering from the tube end side and the other moving out of the tube at the same speed. A pair of contact-type or non-contact-type rods 8, 8 for wall thickness measurement are installed on a support stand 10 installed behind the stopper 3, and the speed of the rods 8, 8 when they move forward is The wall thickness of the pipe end is approximately measured sequentially toward the chuck side using the spiral pitch drawn at the rotation speed of the steel pipe (tube to be measured; 1 (1)) and the position of the position transmitters 9, 9. An automatic wall thickness measurement control device C2 is provided to detect and store the pipe end cutting position.

Further, a tool rest 1 on which a cutting tool 11 for moving forward and backward is mounted.
2 to the above-mentioned memorized position.
A turret automatic control device C3 is provided which is linked to the turret.

The cutting tool 11 moves to a memorized position and then moves forward to cut.After cutting, it moves back in response to an ON signal from a phototube.5When cutting the tube end with the above control device, the first As shown in the figure, the steel pipe 1 that has been conveyed from the left during the pipe cutting process hits the stopper 3 and stops, and the steel pipe 1 returns in the opposite direction due to the reaction. If it shows an ON signal, it means that the steel pipe 1 has not reached the predetermined pipe support position, so the steel pipe is repeatedly transferred to the stopper 3 side until it shows an OFF signal.

On the other hand, when an off signal is shown, the chuck 7 immediately operates to grip and fix the steel pipe 1.

Next, the on/off signal of the phototube 50, which rotates together with the chuck at the required rotation speed, is determined by measuring the amount of reverse return using the load cell 2, which measures the impact load when the steel pipe 1 hits the stopper. A timer 6 serving as an operation switch for the interlocked phototube 5 makes it clear when the signal of the phototube 5 is judged.

Then, as the steel pipe 1 starts rotating, the rods 8, 8 move forward toward the chuck at a constant speed, confirm the constant rotation of the steel pipe at a position on the line between the projector 4 and the photocell 5, and take a moment to start measurement. make it stop.

The steel pipe 10 rotates at the same constant angular velocity θ as the chuck 7, and the rods 8, 8 move forward at a constant speed ■.

Therefore, the wall thickness is sequentially measured at a helical pitch of 2π/θ, 2 toward the chuck side.

In addition, the measured value is stored in the wall thickness automatic measurement control device C2.
When a value that satisfies the wall thickness standard is measured during the above n pitches, the rod advances at that position (optimum cutting position) If the wall thickness standard at a point is satisfied, the cutting position is determined at that point, and if it is not satisfied, the wall thickness measurement of the spiral pitch is continued to determine the cutting position.

After measurement, move the rods 8 and 8 back to their original positions.
Finish the measurement.

Then, the tool post 12 placed at a distance α from the chuck 7 is moved to the already stored cutting position X, and the cutting tool 11 is advanced to cut the tube end.

The cut end of the tube falls downward and is stored, but the off signal of the phototube 5 immediately changes to an on signal due to the blocked end of the tube. The cutting tool 11 begins to retreat, and after retreating to a predetermined position, the tool rest 12 is moved and returned to the original position α.

Then, at the same time as the chang 2F 0 rotation is stopped and the steel pipe 1 is released, a conveyor (not shown) rotates to transport the steel pipe 1 to the left, completing the entire process.

In addition, if the measurement results show that the entire length of the tube end is thin and defective, either cut it at a position near the chuck and then repeat the same process again from the beginning, or use a tube end cutting machine. A marking device attached to the machine marks thin wall defects and sends them to the downstream process.

Further, if a large number of position transmitters are arranged in the direction of the tube axis of the rods 8, 8, the value to be measured can be determined by simple logic at the time of re-measurement, so that re-measurement can be omitted.

Furthermore, by adjusting the rod feed rate (2), the helical pitch during measurement can be freely changed.

As described above, this invention uses a device that automatically measures the optimal cutting position of the pipe before cutting, and has each control circuit that enables cutting at that position, thereby eliminating the need for insufficient or excessive cutting. Since it is possible to cut reliably and always meet wall thickness specifications, yields and production efficiency can be greatly improved.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing an embodiment of the present invention. In the figure 1... steel pipe, 2... load cell, 3... stopper, 4... floodlight, 5'... phototube, 6... timer, 7... chuck, 8... rod , 9... Position transmitter, 10... Support stand, 11... Byte, 12
... Turret, 13... Feeding device, C1... Pipe automatic support control device, C2... Wall thickness automatic measurement control device, C3
...Turret automatic control device, X...□Optimum cutting position,
θ...Constant angular velocity, ■...Constant feeding speed of the rod.

Claims (1)

[Claims] 1. The attachment of the tube transported to the tube end cutting process is carried out using a tube automatic support control device that allows the tube to be attached and detached and to freely stop rotation using a chuck that is linked to a signal that detects whether the tube is in good or bad position. Position transmitters are provided oppositely at the tips of a pair of rods that face each other and move forward and backward at the same speed in the axial direction of the tube from the tube end side, and the position transmitters are installed opposite to each other at the ends of the rods. an automatic wall thickness measurement control device that sequentially approximates the wall thickness of a tube end toward the advancing side based on a helical pitch drawn at the position of the position transmitter, detects and stores an optimal tube end cutting position; An automatic tube end cutting device comprising an automatic turret control device in which the turret moves to a memorized cutting position for cutting.