JP5103836B2 - Pipe end deburring method for steel pipes - Google Patents

Description

The present invention relates to a pipe end burr removal method suitable for removing a pipe end burr generated in a cutting process of a steel pipe.

  When manufacturing a steel pipe such as an electric resistance steel pipe, a traveling cutting machine is arranged in a line and is cut to a predetermined length online (Non-Patent Document 1). In such a steel pipe cutting process, burrs occur at the end of the pipe. FIG. 8 shows a typical example of the pipe end burr 4 generated in the cutting process of the ERW steel pipe. When such a pipe end burr exists, a pipe fistula is generated at the time of transverse feed contact pipe. Therefore, after removing the pipe end burr, the steel pipe is supplied to the downstream process (see FIG. 7).

  At that time, if the processing time (referred to as cycle time) for removing the pipe end burrs online does not become a bottleneck, the pipe end burrs are removed by cropping with a plasma cutter, a tip saw, or the like. When the pipe end burr removal is performed by such a method, a part of the steel pipe is cropped, so that the yield is deteriorated. Further, since it takes a processing time to cut the crop, there is a disadvantage that it cannot be handled if the cycle time in the cutting process is shortened.

Recently, in a line for producing a steel pipe such as an electric resistance steel pipe, the cycle time in the cutting process is frequently shortened, and it is required to cope with this. For this reason, as a specific means, it was examined to remove pipe end burrs with a chamfering machine in which a tip is mounted on a spindle.
Edited by Japan Iron and Steel Institute, “Third Edition Steel Handbook Volume III (2)” published by Maruzen Co., Ltd., November 20, 1980, p1056 to p1057

  However, if the end burr removal of the steel pipe is performed with a chamfering machine in which the tip is mounted on the spindle, a problem due to the shape of the tip occurs. Hereinafter, a method for removing pipe end burrs from a conventional chamfering machine will be described with reference to the drawings. FIG. 9 is a plan view for explaining the problems of the conventional method for removing the end burr of a steel pipe, and FIGS. 10 (a) and 10 (b) are front views showing a rectangular chip 3A mounted on a conventional chamfering machine. It is a figure and a side view.

  In the conventional method, the tip 3A is attached to the spindle 1 and the tip 3A is removed in the process of rotating the spindle 1 toward the end of the pipe while rotating the spindle 1 in the process of cutting the steel pipe. The outer peripheral part of the pipe end was cut. At that time, there is a problem that the corner of the tip protruding toward the forward side comes into contact with the tube end burr 4 and chipping is likely to occur due to the impact at that time.

Further, since it is necessary to incline the linear blade formed on one side of the tip 3A by the chamfering angle α, the cutting allowance of the pipe end must be increased, and the cutting load increases. Therefore, there is a problem that the life of the chip is short, leading to deterioration of the burr removal basic unit and a decrease in productivity due to a line stop for chip replacement.
The present invention solves the above-mentioned problems of the prior art and suppresses the burr at the end of the pipe in a short time and reliably while suppressing the deterioration of the burr removal unit and the decrease in productivity. An object of the present invention is to provide a method for removing a pipe end burr from a steel pipe that can be removed.

The present inventor has eagerly investigated that, in place of the square tip, there is no corner protruding to the forward side, and the cutting margin required to reliably remove the pipe end burr with the tip is made smaller than before. The knowledge that the said subject can be solved effectively by using the chip | tip of the shape which can be obtained was acquired.
The present invention is as follows.

1. A pipe end burr removal method that removes a pipe end burr generated in a cutting process in a steel pipe production line online, with a round tip without a corner protruding to the forward side at one end of a spindle. A pipe end burr generated in the cutting process of the steel pipe in the process of detachably mounting with a chip relief angle θ of more than 0 degrees and less than 90 degrees and advancing toward the pipe end while rotating the spindle. Is removed with the tip, and the outer peripheral portion of the tube end is cut at a cutting speed of 112 to 174 m / min with the blade of the tip.
2. The spindle feed speed is set to be slower than the high speed advance until the tip side edge of the tip reaches the pipe end position in the subsequent deburring feed and cutting feed. . A method for removing burrs at the end of a steel pipe as described in 1.

  According to the present invention, instead of a square tip, a round tip without a corner protruding to the forward side is attached to the spindle, and in the process of rotating the spindle forward toward the end of the tube, Since the pipe end burr generated in the cutting process is removed, the chip is not easily chipped and resistant to an impact when contacting the pipe end burr. Also, instead of a square tip with a straight blade formed on one side, the tip of the tube end is cut with a round tip that can reduce the cutting allowance at the end of the tube, so the cutting load is reduced. The chip life can be extended until chip replacement. For this reason, the pipe end burr | flash produced in the cutting process of a steel pipe can be reliably removed on-line in a short time while suppressing the deterioration of the burr removal unit and the decrease in productivity.

First, an example of a pipe end deburring device used in the method of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an example of a tube end deburring device used in the method of the present invention, and FIG. 2A shows the shape of a tip used in the example of tube end deburring device used in the method of the present invention. FIG. 2B is a front view, and FIG. FIG. 3 shows an overall configuration of an example of a pipe end deburring device used in the method of the present invention.
Using this pipe end deburring device, the round tip 3B is mounted on the spindle 1 and the pipe end burr generated in the cutting process of the steel pipe is removed in the process of moving the spindle forward while rotating the spindle. At the same time, it is a feature of the present invention that the outer peripheral portion of the tube end is cut with a blade formed on the edge thereof.

  As shown in FIGS. 1 and 2, the round tip 3 </ b> B is formed with a blade capable of cutting the outer periphery of the tube end on the entire periphery of the edge. The material of this chip can be a super steel alloy or ceramics as in the conventional rectangular chip 3A. However, in the present invention, as shown in FIGS. 2 (a) and 2 (b), a blade is formed on the edge of the tip 3B so that the circular surface with a hole and the peripheral surface in the tip thickness direction are orthogonal to each other. Showed what it is. Other configurations are the same as those of the conventional rectangular chip 3A.

  As shown in FIG. 3, an example of a pipe end deburring device used in the method of the present invention includes a drive source 5 such as a drive motor that rotates the spindle 1, a spindle 1 connected to the drive source 5, Spindle moving means 8 for moving the spindle 1 forward and backward relative to the pipe end surface, a round tip 3B detachably attached to one end of the spindle 1, and pipe end burrs generated in the cutting process of the pipe W The pipe end 6 is provided with a pipe clamp 6 that holds the pipe end coaxially with the spindle axis with the pipe end facing one end of the spindle 1. Reference numeral 7 denotes a clamping hydraulic pump unit.

  As shown in FIG. 1, the round tip 3 </ b> B is detachably attached to the tip mounting portion of the arm 2, and the base portion of the arm 2 is fixed to one end portion of the spindle 1. The spindle moving means described above includes a slider 8 on which the spindle 1 is mounted and a servo motor 11 for moving the head forward and backward. The arm 2 and the tip 3B are on the right side (FIG. 3) of the pipe clamp 6. 9 is a bed of a pipe end deburring device.

  According to this pipe end burr removing device, the pipe end burr generated in the cutting process of the steel pipe is removed in the process of rotating the spindle 1 forward, and at the same time, the blade formed on the edge of the round tip 3B. The outer periphery of the tube end can be cut. At that time, as shown in FIG. 4, it is preferable to provide a chip relief angle θ (θ <90 degrees). In addition, it is possible to make the spindle feed speed slower than the high speed advance until the tip side edge of the tip reaches the pipe end position. In addition, it is preferable because pipe end burrs generated in the steel pipe cutting process can be reliably removed online in a short time while suppressing a decrease in productivity. In FIG. 4, a: From the standby position to b: rapid feed completion position corresponds to high-speed forward movement, and after b, c: deburring cutting completion position, d: pipe end contact position, and e: cutting feed completion position. Corresponds to feed and cutting feed. Conditions such as these positions, spindle feed speed of each section, spindle rotation speed, etc. are set in the control panel 10 of the chamfering machine and are executed when pipe end burr removal is performed.

Here, as shown in FIG. 5 in comparison with the conventional case, the cutting allowance t1 of the pipe end necessary for reliably removing the pipe end burr is changed from a round tip to a square tip. It can be made smaller. Further, FIG. 6 shows the shape of the tube end burr 4 at the time of cutting the tube end in comparison with a conventional case using a square tip and a case where a round tip is mounted on a spindle.
As described above, according to the present invention, a round tip is attached to the spindle 1, and the pipe end burr generated in the cutting process of the steel pipe is removed in the process of moving the spindle forward while moving the spindle. At the same time, since the outer peripheral portion of the tube end is cut with the blade formed on the edge, the above-described actions and effects can be exhibited. Chips that can exhibit the functions and effects described above are easy to manufacture with round (circular) chips (see FIGS. 1 and 2 (a)). According to the processing machine provided, it can be easily manufactured. Similar to the circular tip, such an elliptic tip has a shape with no corner protruding to the forward side, and the tube end cutting margin t1 necessary for reliably removing the tube end burr is reduced by the conventional tip. Since it can be made smaller than a square chip, the above-described functions and effects can be exhibited.

  The present invention was applied to an ERW steel pipe production line for producing a steel pipe (equivalent to STKM13B) having an outer diameter of 76.3 to 114.3 mm and a wall thickness of 1.8 to 8.4 mm. At that time, instead of the conventional rectangular tip, there is no corner protruding to the forward side, and the cutting margin of the tube end required to reliably remove the tube end burr with the tip is smaller than the conventional tip. A round chip that can be used was used. The outer diameter of the round chip was 20 mm, and the chip thickness was 7 mm. The other pipe end burr removal conditions and required time are shown in Table 1 (steel pipe diameter = 88 mm). Deburring feed refers to feed that removes pipe end burrs before cutting the outer periphery of the tube end. Cutting feed refers to cutting the outer peripheral portion of the pipe end, This is a feed that removes the burr at the end of the tube that could not be removed.

  From the results shown in Table 1, the pipe end burrs generated in the cutting process of the ERW steel pipe could be reliably removed in a short net cutting time of 1.81 seconds per pipe end. In addition, as a result of applying the present invention to an ERW steel pipe production line, the tip life can be extended more than four times compared to the conventional case where a square tip is mounted on the spindle, and the deburring unit is reduced to 1/4. The productivity could also be maintained without being affected by the deburring process. In this embodiment, the present invention is described as being applied to a production line for ERW steel pipes, but the present invention can also be applied to a production line for steel pipes such as seamless steel pipes. In addition, when manufacturing non-ferrous round pipes made of copper, non-ferrous round pipes made of resin, etc., the present invention can be applied to the burr removing process following the cutting process (see FIG. 7).

It is a top view which shows an example pipe end burr | flash removal apparatus used for the method of this invention. It is the front view (a) and side view (b) which show the round-shaped chip | tip used for the pipe end burr | flash removal apparatus of an example used for the method of this invention. It is a side view which shows the whole structure of an example pipe end burr | flash removal apparatus used for the method of this invention. It is explanatory drawing which shows the burr removal method by the pipe end burr removal apparatus of an example used for the method of this invention. It is a top view which shows the external appearance of the steel pipe at the time of applying this invention compared with the past. It is a top view which shows the burr | flash shape removed at the time of applying this invention compared with the conventional case. It is process drawing which shows the burr | flash removal process to which this invention is applied. It is the front view which showed the pipe end burr | flash state which arose in the cutting process of a steel pipe. It is a top view explaining the problem of the burr removal method using the conventional chamfering machine. It is the front view (a) and side view (b) which show the square-shaped chip | tip with which the conventional chamfering machine was mounted | worn.

Explanation of symbols

1 Spindle 1A Spindle axis 2 Arm 3A, 3B Tip 4 Pipe end burr 5 Drive source (drive motor)
6 Pipe clamp 7 Hydraulic pump unit 8 Slider 9 Bed 10 Control panel 11 Servo motor t Wall thickness t1 Cutting allowance α Chamfer angle

Claims (2)

A pipe end burr removal method for removing pipe end burr generated in a cutting process in a steel pipe production line online,
At one end of the spindle, a round chip without a corner protruding to the forward side is detachable and mounted with a chip relief angle θ of more than 0 degrees and less than 90 degrees, and the spindle is rotated. In the process of moving forward toward the pipe end, the pipe end burr generated in the cutting process of the steel pipe is removed with the tip, and the outer periphery of the pipe end is cut at a cutting speed of 112 to 174 m / min with the blade of the tip. A method for removing burrs at the end of a steel pipe characterized by the following.   2. The feed rate of the spindle is made slower than the high speed advance until the advance side edge of the tip reaches the pipe end position in subsequent deburring feed and cutting feed. A method for removing burrs at the end of a steel pipe as described in 1.

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