JPH08294815A - Sizing device of tubular bar material - Google Patents

Abstract

PURPOSE: To directly stop a tubular bar material in a specific position with excellent reproducibility by restraining a recoil of the tubular bar material to the minimum extent in spite of a change in collision energy. CONSTITUTION: A pneumatic cylinder 31 as a shock absorbing means to absorb its shock by colliding a tubular bar material is provided. The tubular bar material is collided with a material colliding head 35 installed on the tip of a piston rod 34. Air discharged from a cylinder tube 32 is passed through a throttle valve 34, and flowing resistance is applied. After most of collision energy is consumed by the flowing resistance, the material colliding head 35 is applied to a head stopper 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube rod sizing device used for, for example, slicing a hot extruded pipe discharged from a horizontal press.

[0002]

2. Description of the Related Art Hot extrusion is one of the tube making processes.
There is cold rolling. In this tube making process, hot extruded tubes are cut to dimensions suitable for cold rolling. In this case, in order to improve the pipe manufacturing efficiency, it is considered to hot cut the high temperature hot extruded pipe discharged from the horizontal press on the discharge line. Also, application of a highly efficient sizing device is considered.

The sizing device usually has a carriage that moves along a line for longitudinally feeding the pipe rod material and stops at an arbitrary position, and the pipe rod material collides with the buffer means supported on the line by the carriage. Let it stop at a fixed position. Since this device basically only stops the material that is fed vertically, it is more efficient than a general positioning device that constrains the material and forcibly moves it to a fixed position. It can be said that the device is particularly suitable for positioning the hot extruded pipe to be conveyed.

[0004]

In such a sizing device, since the pipe rods collide at a high speed, the rebound of the pipe rods becomes a problem. For that reason, a cushioning means is provided, but even if the cushioning means is provided, it is difficult to always stop the tube rod member at the same position.

That is, there are rubber dampers, springs, hydraulic shock absorbers, etc. as the buffer means, and among them, the hydraulic shock absorber has particularly good characteristics. Figure 5 shows the general characteristics of a hydraulic shock absorber.
Shown in As can be seen from FIG. 5, the hydraulic shock absorber has a large built-in spring, so that a large reaction force F remains even at the mechanical end (retraction limit of the piston). The material stops at that position only when the collision energy of the material is completely consumed at the mechanical end, but it is difficult to always reproduce this state in the actual operation, and usually the collision energy remains at the mechanical end, Either the collision energy will be consumed before the mechanical end. In the former case, the material bounces,
In the latter case, the stop position greatly varies due to the change in collision energy, and the material bounces depending on the magnitude of the drag force F.

As described above, in the conventional sizing apparatus, it is difficult to always stop the pipe rod member at the same position even if the hydraulic shock absorber having the best characteristics is used as the cushioning means. Therefore, until now, even after the collision, the vertical feed roller was kept rotating, and measures were taken to apply a certain thrust to the material until the stop position converges to the final position. In addition, there is a problem that the material has slip flaws, and the decrease in efficiency due to time loss during this period is also a serious problem.

The object of the present invention is to solve these problems,
An object of the present invention is to provide a sizing device capable of accurately stopping a tube rod material at a fixed position in a short time without performing a converging operation.

[0008]

The sizing apparatus of the present invention comprises a carriage that moves along a line for longitudinally feeding a pipe rod and stops at an arbitrary position, and a carriage that is supported by the carriage on the line. And a shock absorbing means for absorbing the shock by colliding the end surface of the pipe rod material in order to stop the pipe end material conveyed at a fixed position. The shock absorbing means is provided with a material collision head at the tip of the piston. , A pneumatic cylinder in which the piston rod retracts into the cylinder tube due to material collision,
A throttle valve that gives flow resistance to the gas discharged from the cylinder tube when the piston rod retracts, a head stopper that finally stops the backward movement of the material collision head, and an initial advance of the retracted material collision head. It has a gas supply source for supplying gas to the cylinder tube, and a switching valve for switching and connecting the gas supply source and the throttle valve to the cylinder tube.

[0009]

[Function] When the pipe rod collides with the material collision head provided at the tip of the piston rod of the pneumatic cylinder, the piston rod retracts into the cylinder tube, compresses the gas in the cylinder tube, and removes the gas from the tube. Is discharged. The discharged gas passes through the throttle valve, and the collision energy of the tube rod material is mainly consumed by the flow resistance and the gas compression at this time, and finally the material collision head hits the head stripper and stops. At this time, the drag force F of the gas pressure cylinder exhibits a characteristic as shown in FIG. 4 by being combined with the throttle valve.

Initially, the drag force F increases toward the peak point as the stroke increases due to the compression of the gas. After that, the drag decreases as the stroke increases due to the increase in the discharge speed due to the increase in the internal pressure. A flat area L where the drag F is small before the end of the stroke
However, by hitting the material collision head against the head stopper, the tube rod can always be stopped at the same position even if the collision energy changes. That is, compared with the hydraulic shock absorber, the reaction force F at the mechanical end can be reduced, and since the region where the reaction force F is small is wide, the mechanical end can be set reliably in that region.
Contributes to the stable stopping of the tube rod.

After the tube rod material is stopped at a fixed position, the material collision head is advanced to the initial position to prepare for the next tube rod material.

As the gas pressure cylinder, it is desirable to use a pneumatic cylinder having a small drag F and a flat region L easily obtained by combination with a throttle valve.

[0013]

Embodiments of the present invention will be described below. 1 is a plan view showing the overall structure of an example of a sizing device embodying the present invention, FIG. 2 is a view taken along the line AA of FIG. 1, and FIG.
2 is a view taken along the line BB in FIG. 2, and FIG. 4 is a schematic view showing the structure and characteristics of the buffer means.

This sizing device, as shown in FIGS.
A trolley 20 which is self-propelled along the vertical feed line of the pipe rod W,
And a cushioning means 30 for stopping the pipe rod W conveyed on the vertical feed line. The vertical feed line includes a plurality of transport rollers 10.

The trolley 20 is mounted on rails 21 and 21 laid along the above line, and the motor 22 and the speed reducer 23 mounted on the upper surface of the trolley 20 are used to mount the pinion gear 2 on the lower surface.
4 is configured to rotate. Here, the pinion gear 24 meshes with the rack gear 25 laid between the rails 21 and 21, whereby the carriage 20 moves forward and backward along the line. Further, in order to stop the truck 20 and fix the truck 20 at the stop position, a disc rail 26 is laid along the outer rail 21, and disc brakes 27, 27 sandwiching the disc rail 26 are attached to the side surface of the truck 20.

The buffer means 30 has a pneumatic cylinder 31 provided in parallel with the traveling direction of the carriage 20. The pneumatic cylinder 31 is attached to the tip end of the arm 28 extending from above the carriage 20 onto the line. The base of the arm 28 is rotatably cantilevered by an axis parallel to the traveling direction of the carriage 20, and is rotated by a cylinder 29 on the carriage 20. As a result, the pneumatic cylinder 31 reciprocates between the material blocking position on the line and the retracted position above it.

The cylinder tube 32 of the pneumatic cylinder 31 has a pair of plates 3 on the rear surface of the tip of the arm 28.
They are connected by 3, 33. Further, the piston rod 34 penetrates the tip of the arm 28 and projects to the front thereof, and supports the material collision head 35 at the tip. The tip portion of the arm 28 located between the cylinder tube 32 and the material collision head 35 incorporates a slide guide for supporting the piston rod 34, and finally stops the material collision head 35 when it retracts. It also serves as the head stopper 36.

The damping means 30 also includes a two-position switching valve 37 for controlling the pneumatic cylinder 31, as shown in FIG.
Have. In the first position P1, the cavity on the side opposite to the rod in the cylinder tube 32 is connected to the air pressure source, and
At the position P2, the vacant chamber on the side opposite to the rod is connected to the throttle valve 38. The rod-side vacant chamber is always open. The throttle valve 38 is of a type capable of adjusting its throttle amount, which adjustment will be described later.

Next, the material restraining operation using this sizing device will be described.

After the carriage 20 is moved in accordance with the material stopping position, it is fixed by the disc brakes 27, 27. Then, the pneumatic cylinder 31 is fixed at the material stopping position on the line, and the two-position switching valve 37 is fixed at the second position P2. In this state, when the pipe rod W is conveyed from the front, the tip of the pipe rod W collides with the material collision head 35. Then, the material collision head 35 retracts, the piston rod 34 retracts into the cylinder tube 32, and the air in the cylinder tube 32 is compressed and discharged to the outside of the cylinder tube 32. The discharged air is the throttle valve 3
Most of the collision energy of the pipe rod W is consumed by the flow resistance at this time.

At this time, the pneumatic cylinder 31 includes the throttle valve 3
When combined with No. 8, a drag force characteristic as shown in FIG. 4 is exhibited. Since the air is compressed at the beginning of the collision, the drag F is small, and thereafter the drag F increases as the stroke increases. Since the exhaust velocity increases as the internal pressure increases, the drag force F reaches its peak, and thereafter, the drag force F decreases as the stroke increases. Then, at the end of the stroke, the drag F becomes 0, but before this, there is a flat region L where the drag F is small and flat. When the material collision head 35 hits the head stopper 36 in this area,
No rebound of the tube rod W occurs. Moreover, since this region is wide, it is possible to prevent rebound even if the collision energy changes. The throttle amount of the throttle valve 38 is adjusted to realize this state.

The material collision head 35 is attached to the head stopper 3
When it hits 6, it is detected by the sensor 37, and a sizing positioning completion signal is transmitted. In response to this, the transport roller 10 stops. Further, in the constant-size cutting of the tube rod material W, the tube rod material W is fixed and the cutting is started.

When the tube rod W is to be stopped and positioned continuously, the pneumatic cylinder 31 is moved to the upper retracted position,
After the carriage 20 is moved to the next stop position, the pneumatic cylinder 31 is lowered to the stop position and the two-position switching valve 37 is operated to the first position P1. As a result, compressed air is supplied to the cylinder tube 32, and the material collision head 35 returns to the initial position.

The material collision head 35 is attached to the head stopper 3
Positioning can also be performed by operating the two-position switching valve 37 to the first position P1 after hitting 6, and pushing the tube rod W back.

The outer diameter is 25 to 114 mm and the maximum length is 30.
When stopping the hot extruded tube of m at the constant-size cutting position, in the conventional sizing device using the hydraulic shock absorber as the cushioning means, the conveying speed is set to 60 in order to prevent the rebound of the material.
The stop position was converged by setting the speed to m / min or less, and further repeating the collision by continuously rotating the conveying roller even after the first collision. Therefore, slip flaws occur, the cycle time becomes longer, and a single piece cannot be cut in the extrusion pipe making cycle, so that a large number of pieces must be cut simultaneously. As a result, the materials are not aligned due to the friction between the adjacent materials, and the dimensional variation is large, and it is necessary to increase the cutting margin. However, with this sizing device, the same material can be conveyed at a maximum speed of 120 m / min and decelerated to about 10 m / min before the sizing device, so that it can be stopped at a fixed position without a converging operation. In addition to preventing slip flaws, it became possible to cut a single piece in the extrusion pipe making cycle, and it was possible to reduce the cutting margin.

[0026]

As described above, the sizing device of the present invention minimizes the bounce of the material regardless of the change in the collision energy, and thus the material can be directly stopped at the fixed position with good reproducibility. it can. Therefore, the stop position accuracy is high. In addition, since there is no need to perform a converging operation after the first collision, there is no risk of slip flaws on the material, the cycle time is shortened, and the speed of material transfer can be increased, improving the processing efficiency. Great effect.

[Brief description of drawings]

FIG. 1 is a plan view showing an overall configuration of an example of a sizing device embodying the present invention.

FIG. 2 is a view taken along the line AA of FIG.

FIG. 3 is a view taken along line BB of FIGS. 1 and 2.

FIG. 4 is a schematic diagram showing a configuration and characteristics of a buffer unit.

FIG. 5 is a schematic diagram showing characteristics of a hydraulic shock absorber and a material restraining principle using the same.

[Explanation of symbols]

 10 Conveyor Roller 20 Bogie 30 Buffer Means 31 Pneumatic Cylinder 35 Pneumatic Cylinder 35 Material Collision Head 36 Head Stopper 37 Switching Valve 38 Throttle Valve W Pipe Rod Material

Claims (1)

[Claims] 1. A trolley which moves along a line for longitudinally feeding a pipe rod and stops at an arbitrary position, and a pipe rod supported on the line by the trolley and conveyed on the line is stopped at a fixed position. Shock absorbing means for colliding the end surface of the pipe end material to absorb the shock, the shock absorbing means is provided with a material collision head at the tip of the piston, and the piston rod is moved in the cylinder tube with the material collision. Gas cylinder that retreats to the cylinder, a throttle valve that gives flow resistance to the gas discharged from the cylinder tube when the piston rod retreats, a head stopper that finally stops the backward movement of the material collision head, A gas supply source that supplies gas to the cylinder tube to advance the material collision head initially, and a gas supply source and the throttle valve are switched and connected to the cylinder tube. That the switching valve and the measuring device of the tube bar characterized in that it comprises a.