TWI236943B - Method for machining the end of a steel pipe - Google Patents

Abstract

An outer edge of the end of steel pipe 16 is machined with a rotating chip 34 which is fixed onto a cutting tool driven to rotate by a rotary head, chip 34 being rotated to trace the contour of the outer edge of the end of steel pipe 16 while the rotary head is mounted on a cutting apparatus 14 which is moved towards the end of the steel tube 16. As soon as the cutting apparatus has moved forwards a predetermined feed length of intermittent cutting, the apparatus 14 is moved backwards for a length of a predetermined temporary retract from the end of the steel pipe, thereby the chip 34 is caused to depart from the cutting surface to interrupt the cutting operation. After the apparatus has stopped and stayed at the retracted position for a predetermined stopping time, the apparatus is moved forwards again for a feed length of an intermittent cutting from the position where the cutting was once interrupted. Thereafter the above process of retract movement from the end of the steel pipe is repeated to perform machining of the end of the steel pipe to form a desired amount of chamfer.

Description

1236943 V. Description of the Invention (1) [Technical Field of the Invention] The present invention relates to a method for processing a steel pipe end, and more specifically, is provided on a device body that can be moved to approach / remove a steel pipe end. A rotatable rotary disk and a processing device with a cutter mounted on the rotary disk, in a state in which the rotary disk is rotated, the end of the steel pipe is cut by the tool by moving the device main body to approach the end of the steel pipe. Trimming (rounding, beveling, or chamfering) and plane processing methods. [Known technology] A processing device that generally performs trimming and plane processing on the outer end, inner end, or shaft end surface of a steel pipe. It has a rotating disk and is arranged on a main shaft that is pivotally supported on the main body of the device. The front end surface of the rotating disk is provided with a slide seat (sadd 1 e) that can be freely adjusted and moved in the radial direction. The slide seat is radially offset from the rotation center of the rotary disk to be positioned and fixed in an appropriate position. At the same time, a tool table is installed. The tool table is equipped with tools (knives) according to the processing position and shape of the steel pipe. Turning tool. Then, while positioning the front end surface of the rotary disk opposite to the end surface of the steel tube, and positioning the tool table with the machining position of the steel tube by the slide seat, the rotary disk is rotated in a desired direction and the device body is moved at the same time. The end of the steel pipe is approached, and the end of the steel pipe is cut and trimmed and plane-processed by using the tool of the tool table that rotates with the rotation of the rotary disk.

Ducted tube

314012.ptd Page 10 1236943 V. Description of the invention (2) The tool shortens its life and cannot cut smoothly, which causes the problem of rotating disk rotation failure. In addition, the treatment of excessively long chips is too complicated and has been talked about. Therefore, a chip breaker is provided to cut the chips, or in the trimming and plane processing, the feed of the main body of the device is controlled to stop periodically (dwel 1, pause feed). The chip is cut or cut at an appropriate length, so that the chip does not extend too long. However, when the above-mentioned chip breaker is provided, the original cutting cannot be performed smoothly due to the cutting resistance of chips from the chip breaker. Furthermore, there is a problem that the structure becomes complicated due to the increase in the number of components. In response to this, when the above-mentioned feed pause is implemented, there is no case that the processing is blocked and the number of components increases. However, in order to cut the chips surely, the feed stop time of the device body must be extended, so that the lack of processing efficiency is also lost Reviled by others. [Objective of the Invention] An object of the present invention is to provide a method for processing a steel pipe end, in view of the above-mentioned problems in the conventional technology, and propose a solution suitable for solving such problems, which can prevent the steel pipe The chips generated during processing are too long, so the problem of reduced processing efficiency will not occur, so that the machine can run efficiently. [Method to solve the problem] In order to overcome the above problems and achieve the desired purpose, the method of processing a steel pipe end according to the present invention is to repeatedly perform the following steps to apply a predetermined amount to the steel pipe end Trimming and plane processing:

314012.ptd Page 11 12369943 V. Description of the invention (3) Processing is performed by a processing device, wherein the processing device is provided with: a device main body, which can be moved close to or removed from the end of a steel pipe maintained at a predetermined position, and rotated A disk is rotatably arranged on the main body of the device, and a cutter is arranged on the rotary disk. In a state where the rotary disk is rotated, the main body of the device is moved to approach the end of the steel pipe and cut by the cutter. In the method for processing a steel pipe end for trimming and plane processing of the steel pipe end portion, the above-mentioned rotation is performed by moving the above-mentioned device main body to approach the steel pipe end portion, and performing cutting only by a feed length intermittently with a cutter. In the range of 5 to 200% of the feed per revolution of the disc, move the device body backward from the end of the steel pipe, use the tool to remove the cutting surface to interrupt cutting, and then move the device body again to approach The end of the steel pipe is cut with a feed length of intermittent cutting by a tool. [Embodiment of the Invention] Next, the method for processing the end of a steel pipe according to the present invention will be described with reference to the accompanying drawings as follows: FIG. 1 shows the outline of a processing device for implementing the processing method of the embodiment Structure drawing, the processing device M is arranged on the base (Base) 10 with a pair of parallel guide rails 12, 2 (only one side shown), and the device body 14 is mounted in a sliding manner On the guide rails 12 and 12. In addition, a holding device 18 is arranged on the machine frame 10 facing the front of the device main body 14 and is attached to the end surface of the steel pipe 16 to face the device main body 14 to determine and hold the position of the steel pipe 16 and hold it. The device main body 14 includes a servo motor (drive source) 19, and a feed mechanism constituted by a combination of a screw shaft and a nut that rotates in the forward and reverse directions of the motor 19

314012.ptd Page 12 1236943 V. Description of the invention (4) 2 0, 俾 moves to approach or remove the end of the steel pipe 16 held by the holding device 18. A main shaft (not shown) parallel to the above-mentioned guide 12 is rotatably pivoted inside the above-mentioned device body 14, and a circular rotating disk is integrally arranged on a shaft end protruding in front of the main body of the main shaft. twenty two. The main shaft is connected to a drive motor 26 through a transmission system 24 composed of gears, belts, and the like, and the drive motor 26 is driven to rotate, so that the main shaft and the rotary disk 22 are rotated integrally. A slide base 2 8 is arranged on the front end surface of the rotating disk 22 in a manner capable of moving in a radial direction. The slide base 2 8 is adjusted according to the size of the steel pipe 16 by an adjusting device (not shown). And adjust the position. In addition, a slide table 28 is provided with a tool table 30 that can be freely exchanged by an automatic tool exchange device (not shown). As shown in FIG. 2, the tool table 30 is provided with a turning tool 32. At the same time, a tool (chip, tip) (tool) 34 is mounted on the turning tool 32 in a freely exchangeable manner. Trimming and plane processing are performed on the outer end, inner end or shaft end face of the steel pipe 16. In the examples, the configuration is shown in which a trimming process is performed on the outer end portion of the steel pipe 16 by the cutter 34. A position detection mechanism (not shown) such as a pulse generator is provided in the above-mentioned feed mechanism 20, and a signal of a current position (movement amount) of the device main body 14 detected by the detection mechanism is input to a computer And other unillustrated control devices. Next, by setting the amount of trimming to be applied to the end of the steel pipe, the amount of plane processing, the starting position of the intermittent cutting, the feed length P of the intermittent cutting, and the feed length P of the forward intermittent cutting only, Various conditions such as the temporary back-off removal length R of the cutting surface of the steel pipe 16 and the stop time at the retracted position are input to the control device, and the above is controlled based on the data

314012.ptd Page 13 1236943 V. Description of the invention (5) ^ -—-__ The servo motor 19 rotates to control the movement of the main body of the device. Sergeant ^ Retreat and remove the length R, which is set within the range of 5 to 2000% of the feed of each turn of the rotating disk 22 (the feed rate after the day and night), and ^ intermittent cutting The back movement is set after the rotating disk 22 has been rotated from 0.1 to 2 revolutions, and the above-mentioned various materials are 70% according to the material of the steel pipe 16. Set it appropriately. [Function of the embodiment] Next, the relationship between the working methods of the processing apparatus of the embodiment thus constructed will be described. Set the above-mentioned materials according to the materials such as trimming and flatness, plus 16 and so on, and input them into the above-mentioned control steel pipe outside the above-mentioned device body 14 according to the above-mentioned holding device 丨 ~. In addition, keeping the size of the steel pipe 16 in its positioning, the above-mentioned knife two: 2 slide seat 2 8 is adjusted against the rotary disk 22 to adjust the position. In addition, the above materials are set as: intermittent cutting feed speed: f (mm / rev), temporary retraction speed · b (mm / rev), the number of intermittent cutting stop rotations corresponding to the stop time during the temporary retraction: S (Rotate). In addition, the feed length of intermittent cutting: P (mm), and the temporarily retracted moving length: R (mm). The rotating disk 22 is driven by the driving motor 26 to rotate, so that the tool 3 4 mounted on the turning tool 3 2 is rotated in accordance with the track of the outer end of the steel pipe 16 and controlled by the control device. The servo motor 19 of the mechanism 2 is rotated, and as shown in FIG. 4, the main body of the device is moved, and the end of the steel pipe 16 is approached (advanced) at an intermittent cutting feed rate. The rotating tool 3 4 is used. The outer end portion of the steel pipe 16 is cut (refer to FIG. 3 (a)). Once the above-mentioned device main body 14 is set in advance only the feed length of intermittent cutting

Page 14 314012.ptd 1236943 ------------------ V. Description of the invention (6) ^ ----- P, that is, the servo motor is controlled by the above control device 丨 9 reverse rotation , Make the main body i 4 set the temporary back-off removal length r only from the end of the steel pipe (cutting surface) (the range of intermittent 1 cutting advance = 5 to 200% of the amount), and move backward at the temporary back-off speed b, Thereby, the cutting operation is interrupted by removing the cutter 34 from the cutting surface (refer to FIG. 3 (b)). In addition, the backward movement of the temporary retreating length R is completed between 0.1 and 2 revolutions of the rotary disk 22 described above. After that, the main body 14 is set back in advance and temporarily retracted back to a length of r, and then set back, as shown in FIG. 4, the device main body 4 is only at a predetermined stop time (corresponding to intermittent cutting to stop rotation) Keep it stopped for a few seconds), and the main unit 14 moves forward again (refer to Figure 3 (c), Figure 4), and moves forward from the position where the cutting was interrupted only after the feed length p of intermittent cutting. Repeat the steps of moving backward from the end of the steel pipe to apply a predetermined amount of trimming and plane processing to the end of the steel pipe. In other words, the device body 1 4 is set to :, while moving repeatedly approaching (cutting) --- moving backward (interrupted cutting)-~ stop (interrupted cutting)-the step of moving close (cutting), while at the end of the steel pipe The amount of trimming (planar machining amount) preset by scribes. In addition, the rotation speed of the rotary disk 22 is set to i30 rpm, the intermittent feed speed f is set to 0.5 mm / rev, the feed length p of the intermittent cutting is set to 2.5 mm, and the temporary retraction speed b is set to 0 to 5 mm. In the case of / rev, for example, a temporary back-moving parameter R is set to 0.2 mm, and the stop time is equivalent to the time and time of 0.5 revolutions of the rotary disk 22. As in the above-mentioned trimming process, the method of actively removing the upper tool 34 from the cutting surface while interrupting the cutting can surely cut the chips generated from the end of the steel pipe and prevent the chips from extending too long. That is, you can prevent cutting

314012.ptd Page 15 1236943 V. Description of the invention (7) It is wound around the turning tool 32 and the tool table 30, so that cutting cannot be performed smoothly, and the rotation failure of the rotating disk 22 mentioned above is prevented. In addition, the moving device main body 14 has a stop time in the moving backward-retracting position-the total time required to reach the cutting surface (cutting interruption time), which is more accurate than the conventional method of only cutting the chip by pausing the feed. The feed-stop time required for cutting is shorter compared to the previous one. Therefore, it can be confirmed by the test described later that the processing efficiency is improved. In addition, when the chips are cut with the pause feed as in the past, the feed mechanism is flexible, and it must be idled several times after the feed is stopped, so it takes time. In contrast, only 0 is required in this embodiment. The idling of 5 turns can shorten the time. [About experimental example] A steel tube of STKM 1 3A steel set with an outer diameter X thickness of 245mmx 13.8mm is set according to the value set by the device body: intermittent cutting feed rate f: 0.5mm / rev, rotation speed of the rotating disk: The cutting process was performed at 130 rpm under the following conditions. (I) As shown in FIG. 5 (a), the first conventional example of continuous cutting is performed under the condition that the feed length P is intermittently cut at intervals of 2.5 mm, and the cutting is started without the pause of the rotary disk. The chip was continuous until the end, and the last chip produced in the test example was a 5 m long chip. (II) As shown in FIG. 5 (b), in the second conventional example where the pause feed is stopped between 0.5 rotations of the rotary disk, the chip can be cut by the execution of the pause feed. As a result, only a part of the chip is thin, which leads to maintaining the connection without cutting. In the embodiment, there is one chip of 2 m, one chip of 1.2 m, one chip of 1 m, and chip of 80 mm. One.

314012.ptd Page 16 1236943 V. Description of the Invention (8)-, y I II) As shown in Figure 5 (c), the condition is that intermittent cutting is performed every 2.5 times. The third conventional example of the feed stoppage when the bismuth row is rotated between 2 revolutions of the bismuth row: Compared with the first conventional example, cutting of the chip with a shorter length will also produce long chips. As a result, In the test example, there are 3 chips of 800 mm, 2 chips of 60 mm, and doves of 2000 mm. In addition, as shown in Fig. 6, the processing time becomes longer and the processing efficiency decreases. (IV) For each of the above-mentioned conventional examples, as shown in Fig. 5 (d) and Fig. 4, the setting conditions are: the feed rate of intermittent cutting is 0.5mm / rev, and the feed length P of intermittent cutting = is The present invention is 2.5mm, the temporary retreat speed is 0.5mm / rev, the temporary retraction and removal length R is 0.2mm, and the stop time of the retracted position (intermittent cutting stop rotation number) is 0.5 rotation of the invention In the example, the short chip length can be cut indefinitely. As a result, in the experimental example, there are 25 chips. And the processing time is shorter than the third conventional example. Here, in the cutting of a steel pipe by the above-mentioned processing device, a coarse chip is generated at a feed amount with respect to the intermittent cutting. In the middle of this cutting, according to setting the feed amount to 0, the rotary disk rotates once, during which the thickness of the chip gradually becomes thinner to

Omm, and the chips become cut. This is based on the conventional chip cutting principle of pause feed. However, in reality, even if the feed amount is 0, the cutting edge of the tool will be retracted by the cutting force. The amount of withdrawal at this time varies depending on the balance between the cutting force and the rigidity of the tool and the processing device. Generally, the cutting force is proportional to the thickness of the chip. When the thickness of the chip is close to 0 mm, the cutting force becomes smaller. 'The amount of tool retreat also gradually decreases. That is, when the thickness of the chip is close to 0 mm, the tip of the relative tool advances, and the thickness of the chip does not change.

314012.ptd Page 17 1236943 V. Description of the invention (9) is Omm. As a result, the chips cannot be cut. Therefore, as in the second conventional example described above, long chips are generated as a result. Therefore, after advancing only the feed length P for cutting, the apparatus main body (tool) is temporarily retracted by a certain length and retracted by the length R, as in the above-mentioned example of the present invention, it is confirmed that the chips can be reliably shortened and separated. However, as for the temporary retracting and removing length R, the feed amount for intermittent cutting is as described above, and the thickness of the chip is used to perform the temporary retracting and removing length R of the feed amount of 5% or more. effect. In addition, if the length R is temporarily retracted and the length R is lengthened, the chip of the length can be surely cut, but the time required for the retraction is increased as in the third embodiment described above, and the processing efficiency is decreased. In addition, if the feed amount of the intermittent cutting is set to 200% or less, the processing time is shorter than that in the third conventional example. That is, setting the temporary back-off removal length R to a range of 5 to 200% of the feed amount of the intermittent cutting does not reduce the machining efficiency and can surely cut the chips. In addition, if the time required for the retraction is set between 0.1 and 2 revolutions of the rotary disk, it can be confirmed that the third conventional example can achieve the purpose of sufficiently improving the processing efficiency. (Refer to Figure 6). In Fig. 6, a dotted line indicates the first known example, a one-dot chain line indicates the second known example, a two-dot chain line indicates the third known example, and a solid line indicates an example of the present invention. In the above-mentioned embodiment, the case where a trimming process is performed on the outer end of a steel pipe is described, but the invention of the present application is not limited to this. 1: When trimming the inner end of a steel pipe, 2: On the shaft of the steel pipe When the end surface is machined flatly, and 3: Both the outer end, inner end, and shaft end face of the steel pipe are trimmed at the same time, and any of the cases is possible when the surface is machined. The drive source of the feed mechanism, and

314012.ptd Page 18 1236943 V. Description of the Invention (ίο) Not limited to the servo motor of the embodiment, other types of motors can also be used. [Effects of the invention] As explained above, according to the processing method of the steel pipe end portion of the present invention, the chips generated at the steel pipe end portion can be surely cut to prevent the extension from being too long, and the chips can be prevented from being entangled in the cutter and the slide, etc. This may result in poor cutting or poor rotation. In addition, in the middle of cutting, the time can be shortened and the machining efficiency can be improved compared with the conventional implementation of a paused feeder.

314012.ptd Page 19 1236943 Brief description of drawings [Simplified description of drawings] Fig. 1 is a schematic configuration diagram of a processing device for implementing a processing method according to an embodiment of the present invention. Fig. 2 is a diagram showing a schematic configuration of a tool post of a processing apparatus in an embodiment. Figures 3 (a) to (c) are explanatory diagrams of the processing method implemented by the processing device in the embodiment. Fig. 4 is a graph showing the relationship between the feed speed and time and the position of the tool tip and time of the machining method implemented by the machining device in the embodiment. Figures 5 (a) to (d) are graphs showing the relationship between the feed rate and time of the conventional and inventive examples in the test examples. Fig. 6 is a graph showing the relationship between the position of the blade tip and time of the conventional and inventive examples in the test examples. [Description of component symbols] 10 Machine base 12 Guidance 14 Device body 16 Steel pipe 18 Holding device 19 Servo motor (drive source) 20 Feed mechanism 22 Rotary disk 24 Transmission system 26 Drive motor 28 Slide saddle 30 Tool table 32 Turning tool 34. Tool M processing device

314012.ptd Page 20

Claims (1)

1236943 VI. Application for patent scope 1. A method for processing the end of a steel pipe. A predetermined amount of trimming and plane processing is applied to the end of the steel pipe. This processing method is a method for processing the end of a steel pipe with a processing device M. The The processing device M is provided with a device main body 14, an end portion of the steel pipe 16 that can be moved to approach or remove and held at a predetermined position, and a rotating disk 22 that is rotatably disposed on the device main body 14, And the cutter 34 are arranged on the rotating disk 22, and the rotating disk 22 is in a rotating state to move the device body 14 to approach the end of the steel pipe, and the end of the steel pipe is cut by the tool 34. The method for processing the end of a steel pipe for trimming and plane processing is characterized by repeatedly performing the following steps: the above-mentioned device main body 14 is moved closer to the end of the steel pipe, and only cutting intermittently is performed by the tool 34 After the feed length, the device body 14 is moved backward from the end of the steel pipe in a range of 5 to 2000% of the feed amount of each rotation of the rotary disk 22, so that the tool 34 is removed from the cutting surface. Interrupt cutting and then The mobile device body 14 near the pipe end is performed by the cutting tool 34 only intermittent feed length. 2. The processing method of the end of a steel pipe as described in the first item of the patent application scope, wherein the above-mentioned device main body 14 is moved backward, and is set to be completed between 0.1 to 2 revolutions of the above-mentioned rotating disk 2 2. 3. For the method for processing the steel pipe end portion of the scope of patent application item 1 or 2, wherein the above-mentioned device main body 14 is set to stay at a predetermined time from the position where the steel pipe end moves backward. 314012.ptd Page 21