JPH0525761Y2 - - Google Patents

Description

[Detailed description of the invention] <Field of industrial application> The present invention relates to a chamfering control device using a tube end processing machine that processes various types of chamfers on the tube end at optimal positions by copying the outer diameter of a steel tube using NC control.

<Prior Art> In steel pipes, the ends of the pipes are cut off and chamfered to form grooves for butt welding. According to the JIS standard, the remaining thickness at the end of such a pipe is 2.4 mm or less, or 1.6 mm if more precision is required.
Accuracy of ±0.8mm is required.

On the other hand, compared to the standard diameter type shown in Figure 6A, the steel pipe material has large tolerances in Figure 6B, small tolerances in Figure 6C, and bends, non-circularities, and uneven thickness as shown in Figure 6D. It often happens that the above remaining thickness cannot be obtained by general lathe machining or blade rotation machining. Therefore, conventionally, chamfering has been performed to follow the outer diameter or inner diameter of the pipe depending on its use.

<Problems to be solved by the invention> However, if only the conventional chamfering process is performed by imitating the outer diameter or inner diameter of the pipe, as shown in Fig. If the angle is different, it is necessary to replace the tool with a tool with a different angle or adjust the angle each time. Therefore, there were problems in that setup work required a lot of time and many types of cutting tools had to be prepared.

The purpose of this invention was proposed in order to solve the problem in view of the above circumstances, and even if the bevel angle θ or the inner diameter chamfer angle δ changes, the setup work can be done easily and easily without changing the tool bit. An object of the present invention is to provide a chamfering control device using a tube end processing machine as described above.

<Means and operations for solving the problems> In order to achieve the above-mentioned purpose, the present invention provides a pipe end processing machine that performs beveling and chamfering on steel pipes, etc. with little uneven thickness, such as electric resistance welded pipes. The main feature of this method is that, at the same time as the outer diameter profiling, various types of beveling and chamfering are performed using tools on the tool rest controlled by Z-axis control by NC. That is, the specific means includes a bed, a headstock placed on the bed, a chuck provided at the end of the main shaft rotatably supported on the headstock, and a A base placed on the bed, a first saddle placed on the base so as to be slidable in the X-axis direction, and a first saddle placed on the first saddle so as to be slidable in the Z-axis direction. The cross slide, the turret placed on the cross slide, the first saddle and the cross slide are controlled by NC to move the turret, and the end of the steel pipe etc. held by the chuck is processed. In the tube end processing machine that performs
The second saddle is attached to the saddle and is movable in the X-axis direction.
a saddle held by the second saddle and screwed onto the first saddle;
a screw shaft for relatively moving the second saddle in the X-axis direction;
a servo motor driven by NC control; a hydraulic cylinder provided on the base and driving the second saddle so as to be relatively movable in the X-axis direction; a valve that controls the supply of pressure oil, and a valve that is movable in the X-axis direction on the first saddle, and one end of which is engaged with the valve and comes into contact with the surface of the steel pipe, etc. when moved in the X-axis direction. and a contact in contact with the steel pipe, when the tool rest is driven by the servo motor to machine the end of a steel pipe or the like in the X-axis direction, the contact is brought into contact with the steel pipe and at the same time the valve is operated. , the hydraulic cylinder is operated via this valve to make the second saddle movable relative to the base, and the position of the tool post relative to the steel pipe is always maintained under optimal tracing control to perform pipe end processing. and a chamfering control device using a tube end processing machine. In conjunction with the movement of the tool post in the X-axis direction, the rollers of the copying device are always urged to copy the outer peripheral portion of the steel pipe or the like by the copying control device.

Therefore, chamfering does not require tool replacement,
Moreover, compound groove machining can be easily and simply performed by changing the NC program.

<Example> Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

(1) First, the principle of the present invention will be explained based on FIG. Tool 1 is installed in front of the tool rest 100 of the tube end processing machine.
01 and then the tip 102 of the tool 101. The tool rest 100 is moved by NC control in two directions, the X-axis and Z-axis directions, by movement of the cross slide 10 and the first saddle 9, as will be described later. A copying device 1 in which a roller 103, which is a contact, moves along the outer peripheral surface of a steel pipe W.
04 is provided on the first saddle 9, and the tool rest 10
Controls the movement of 0.

Further, a hydraulic cylinder 105 that operates in the X-axis direction is attached to the tool post 100. The movement of the hydraulic cylinder 105 is controlled by a copying valve 106. Copy valve 10
6 uses a 4-port 3-position switching valve, which supplies hydraulic pressure from the P port and sends out hydraulic pressure from the T port.

Therefore, in the present invention, the copying valve 106 supplies hydraulic pressure to control the movement of the hydraulic cylinder attached to the tool post 100, and the copying device 10
The rollers 103 of No. 4 follow the outer peripheral surface of the steel pipe W in the radial direction, that is, the X-axis direction, and the rollers 103 of the tool rest 1
00 is kept at a constant distance from the roller 103 in the X-axis direction. The tool rest 100 is moved in the X-axis and Z-axis by a separate drive source, and the tip 102 of the tool 101 performs beveling or chamfering on the steel pipe W.

(2) The specific configuration of the present invention will be explained.

Before explaining the specific configuration of the present invention, an outline of a tube end processing machine to which the present invention is applied will be explained based on FIG. 2.

FIG. 2 is a side view of the tube end processing machine. In FIG. 2, a bed 2 is placed on a base 1,
A headstock 3 is placed on the bed 2. A main shaft 4 is rotatably supported on the head stock 3, and a chuck 5 having a through hole is attached to the end of the main shaft 4.

A steel pipe or the like to be processed is inserted into the chuck 5 and held therein. A cut-off tool rest 6 is placed at a front position close to the headstock 3, and a cut-off tool 7 moves in the X-axis direction, which is the radial direction of the steel pipe, etc., to cut off the steel pipe.

A base 8 is placed behind the bed 2, and a saddle 9 that moves in the X-axis direction is placed on the base 8. A cross slide 10 that moves in the Z-axis direction (direction perpendicular to the X-axis direction) is placed on the saddle 9, and a tool rest 11 is placed on the cross slide 10. Therefore, the tool rest 11
is moved in the X-axis and Z-axis directions. Turret 1
A tool for beveling or chamfering is attached to the front surface of the saddle 9, and a copying device 104 of rollers 103 and 21 that moves while contacting the outer peripheral surface of a steel pipe or the like is arranged at the side end of the saddle 9. ing.

The parting off operation of the steel pipe W by moving the parting off tool rest 6 in the X-axis direction is commanded from the NC control device independently of the operation of the tool rest 11 of the cross slide 10 on the saddle 9, and is normally After the parting operation of the parting tool rest 6, beveling or chamfering is performed by moving the tool rest 11 along the X axis or the Z axis.

Next, specific details of the present invention will be explained in detail with reference to FIGS. 3, 4, and 5.

Figure 3 is a sectional view taken along the - line in Figure 2, Figure 4 is a sectional view taken along the - line in Figure 3, and Figure 5 is a sectional view taken along the line A in Figure 3.
It is an arrow view.

A situation in which the tool post 11 moves in the Z-axis direction and the X-axis direction will be explained with reference to FIGS. 3 and 4. In FIGS. 3 and 4, a saddle 9 moving in the X-axis direction on a base 8 is placed along a sliding surface 12.
It is moved by a ball screw 13 screwed into a nut 16 attached to the lower part of the holder. As shown in FIG. 4, the ball screw 13, which is a screw shaft, is connected to a servo motor via a drive section in an X-axis drive box 14 provided on the second saddle 9a, which is on the same surface as the sliding surface of the saddle 9. 15.

Inside the drive box 14, a pulley 14b is pivotally supported by an output shaft 14a of a servo motor 15, and a timing belt 14d is mounted between the pulley 14b and a pulley 14c pivotally supported at the rear of the ball screw 13.

Then, the servo motor 15 fixed to the drive box 14 is activated, and the rotation is transmitted to the pulley 14b via the output shaft 14a.
The pulley 14c is rotated via a timing belt 14d mounted between the pulley 14c and the timing belt 14d.

The pulley 14c is pivotally supported by the ball screw 13, and since the nut 16 screwed onto the ball screw 13 is fixed to the saddle 9, the saddle 9
is moved in the X-axis direction. On the other hand, a cross slide 10 that moves in the Z-axis direction is placed on the saddle 9, and the cross slide 10 has a ball screw 1 screwed into a nut 17 attached to the bottom thereof.
8 to move in the Z-axis direction. ball screw 1
8 is a drive box 19 for the Z axis as shown in FIG.
It is rotated by a servo motor 20 via a drive section inside. Inside the drive box 19 is a servo motor 2.
A pulley 19b is pivotally supported on the output shaft 19a of the ball screw 18, and a timing belt 1 is connected between the pulley 19b and a pulley 19c that is pivotally supported on the rear part of the ball screw 18.
9d is mounted.

Then, the servo motor 20 is operated and rotation is transmitted to the pulley 19b via the output shaft 19a,
Furthermore, the pulley 19c
is rotated.

The pulley 19c is pivotally supported by the ball screw 18, and since the nut 17 screwed into the ball screw 18 is fixed to the cross slide 10, the cross slide 10 is moved in the Z-axis direction.

Therefore, since the tool rest 11 is placed on the cross slide 10, the Z
It is moved in the X-axis and Z-axis by the axial movement and the movement in the X-axis direction by the saddle 9.

Next, a copying device for copying the outer periphery of a steel pipe or the like will be explained with reference to FIG. The copying device 104 is supported by the side end of the saddle 9, and in FIG. 5, the rollers 21, 103 of the copying device 104 abut against the outer circumference of the steel pipe W, etc., and press it in the X-axis direction to copy it. The roller 21 is supported by a shaft 22 on a roller support part 23, and the roller support part 23 has holes 24a and 24 formed in a guide member 24.
It is formed integrally with the shaft 25 inserted into the shafts b and 24c. A spring 26b is interposed in the hole 24b, and normally urges the rollers 21, 103 forward (leftward in FIG. 5). The rear end of the shaft 25 comes into contact with a roller 26a attached to the tip of the copying valve 26, 106, and when the roller 21 moves along the outer circumference of the steel pipe W, the copying valve 26 moves along with the roller 26a. The flow of oil to the hydraulic cylinder 27 is controlled by the opening and closing of the valve 26a, and the hydraulic cylinder 27 is operated so that the relative position between the saddle 9 and the roller 21 is always kept constant.

The copying valve 26 is connected to a hydraulic cylinder 27 attached to the lower part of the base 8 shown in FIG. As already explained in the principle of the present invention, the operation of the hydraulic cylinder 27 and the copying valve 26 is performed by supplying hydraulic pressure from the P port to the copying valve 26 (1 in Fig. 1).
06) via a hydraulic cylinder 27 (1 in Figure 1).
The amount of oil supplied to 05a) is adjusted. A roller 26a attached to the tip of the copying valve 26
is in contact with the rear part of the shaft 25, and the roller support part 2
The roller 21 attached to the tip of 3 is a steel pipe, etc.
When tracing along the outer circumference of the hydraulic cylinder 272, the position of the saddle 9 in the X-axis direction moves according to the amount of oil supplied to the hydraulic cylinder 272, and the roller 21 and the cutting tool (chip 102) attached to the front of the tool post 11 move. The position of the cutting edge is
It is kept constant based on the outer circumference of W such as a steel pipe.
Therefore, the turret 11 is controlled by NC to move the X-axis,
Beveling or chamfering is performed by moving to a predetermined position in the Z-axis direction. Furthermore, it is also possible to change the groove angle θ and the inner surface angle δ by controlling an NC control device that relatively changes the feed speed of the simultaneous control of the X-axis and the Z-axis.

<Effects> The present invention can be used to attach a copying device to a tube end processing machine to copy the outer diameter when beveling or chamfering a steel pipe that has been deformed into a non-circular shape, such as an electric resistance welded pipe with a small thickness deviation. At the same time, Z-axis control facilitates beveling or chamfering, making it possible to perform accurate chamfering without uneven thickness based on the outer diameter, and with the bevel angle θ,
Even if the inner surface angle δ changes each time, it can be handled without the need to change tools.

Additionally, complex bevel machining can be easily performed by changing the NC program. In addition, the necessary machining pattern
It is also possible to select what you need by storing it in the CNC's memory. Copying device is NC
Since it is linked to the device, the dimensions can be easily corrected.

[Brief explanation of the drawing]

FIG. 1 is a model diagram explaining the principle of the present invention. FIG. 2 is a side view of the tube end processing machine. 3 is a cross-sectional view taken along the line -- in FIG. 2, FIG. 4 is a cross-sectional view taken along the line -- in FIG. 3, and FIG. 5 is a view taken along arrow A in FIG. FIG. 6 is a model diagram when a conventional pipe end processing machine processes a standard type steel pipe, an irregular shape, or an uneven thickness. 100...Turret post, 101...Tool, 102...
...chip, 103 ... roller, 104 ... copying device, 105 ... hydraulic cylinder, 3 ... headstock, 4 ... main shaft, 5 ... chuck, 8 ... base, 9 ... saddle, 10 ... cross slide ,1
1...Turret post, 13,18...Ball screw,
15, 20...Servo motor, 21...Roller,
26... Copying valve, 27... Hydraulic cylinder.

Claims (1)

[Claims for Utility Model Registration] A bed, a headstock placed on the bed, a chuck provided at the end of the main shaft rotatably supported on the headstock, and a A base placed on the bed, a first saddle placed on the base so as to be slidable in the X-axis direction, and a first saddle placed on the first saddle so as to be slidable in the Z-axis direction. The cross slide, the turret placed on the cross slide, the first saddle and the cross slide are controlled by NC to move the turret, and the end of the steel pipe etc. held by the chuck is processed. A tube end processing machine that performs the following steps: a second saddle that is installed on the base together with the first saddle and is movable in the X-axis direction; a second saddle that is held by the second saddle and is screwed to the first saddle; a screw shaft for moving the first saddle in the X-axis direction relative to the second saddle;
a servo motor driven by NC control; a hydraulic cylinder provided on the base and driving the second saddle so as to be relatively movable in the X-axis direction; and a hydraulic cylinder fixedly provided on the first saddle and connected to the hydraulic cylinder. a valve for controlling the supply of pressure oil; a valve movable in the X-axis direction on the first saddle;
and a contact element whose one end engages with the valve and comes into contact with the surface of a steel pipe or the like when moved in the X-axis direction, and the tool rest is moved in the X-axis direction by the drive of the servo motor. When performing end processing, the contactor is also brought into contact with the steel pipe, and at the same time the valve is operated, and the hydraulic cylinder is operated via this valve to move the second saddle relative to the base. A chamfering control device using a pipe end processing machine, which is characterized in that the position of a tool post relative to a steel pipe is always optimally maintained by tracing control, and the pipe end processing is carried out.