JPH0866801A - Internal face machining tool - Google Patents

Abstract

PURPOSE: To provide an internal face machining tool which can carry out mechanically and economically internal surface machining of a cylindrical hollow part of a workpiece. CONSTITUTION: An internal surface machining tool 10 can be also used as a cutting device for removing backside burrs on pipes placed in connection by friction welding. The internal face machining tool is equipped with a long base table 12 of a frame structure, a shaft 14 which is located above the base table 12 and extends in the longitudinal direction thereof, an electric motor 16 for rotating the shaft 14 on its axis, a gyration device 18 for making the shaft 14 gyrate, and a gripping device 20 for gripping a workpiece. The shaft is equipped with a cutting body on its end on the side of the gripping device, and is coupled on the other end through a universal joint 34 to the rotating shaft of the driving device for being rotated on its axis, and also is supported eccentrically by the gyration device 18 and gyrates in the same rotating direction as the shaft rotation by using the universal joint as a fulcrum. By making the shaft gyrate as well as rotating it on its axis with the shaft head inserted inside the workpiece gripped by the gripping device 20, the cutting body machines pressingly the inside face of the workpiece.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner surface processing machine, and more particularly, to a simple structure capable of reliably machining, for example, cutting or polishing the inner surface of a cylindrical hollow portion of a workpiece by a simple operation. The present invention relates to an inner surface processing machine most suitable as a back deburring device for cutting a back burr formed on the inner surface of a tubular body joined by a friction welding method.

[0002]

2. Description of the Related Art Conventionally, when cutting or polishing the inner surface of a cylindrical hollow portion of a workpiece, it has been conventionally done by using a boring machine or by inserting a rod grinder into the hollow portion of the workpiece. , It is processed by hand.

[0003]

However, in the method of processing the inner surface of the hollow portion of the work piece by using the boring machine, the size of the work piece is limited by the size of the boring machine. There is a problem in that the processing cost is increased because an operator is required and the work for setting the workpiece on the boring machine takes time. Therefore, when precision machining is not required, it is often impossible to apply the boring machine machining because the machining cost is not economically matched. On the other hand, in the method of manually working with a rod grinder, the work efficiency is extremely low, and there are individual differences in processing accuracy, which causes problems in process control and quality control.

This problem is particularly noticed in the work of cutting the back burr C as shown in FIG. 9 formed on the entire inner surface of the joint between the pipes A and B joined by the friction welding method. It is because the joining of tubular bodies such as pipes by friction welding has high joining strength and uniform joining quality.
Moreover, since it does not require a skilled welder, it is being adopted for joining plant piping, but there is a problem that an appropriate method for simply removing the back burr generated by joining has not been put to practical use. is there. Conventionally, a method of mechanically removing the back burr has been attempted, but a cutting blade portion having a different size is required for each different size of the pipe, or the back burr removal degree is poor, and the method has not been completed yet. The reality is that it has not been put to practical use. Therefore, in the plant piping processing industry by the friction welding method, it has been strongly desired to realize an apparatus capable of mechanically and economically removing the back burr of the pipe.

In order to solve the above problems, it is an object of the present invention to provide an inner surface processing machine which can mechanically and economically carry out the inner surface processing of a cylindrical hollow portion of a workpiece.

[0006]

The present inventor has developed an inner surface processing machine, particularly an inner surface processing machine that can be used as a back deburring device. 1) The back burr has an extremely high hardness (for example, Vickers hardness is displayed. Then, the base material of the pipe is 130
Even in the case of ~ 140, the back burr reaches from 155 to 170), so the structure should be able to strongly press the cutting tip against the back burr. 2) Use the back burr at a deep position (for example, 4 m ahead) from the end face of the pipe. Considering the removal, the required length of the shaft becomes longer, and the centrifugal force due to the bending and rotation of the shaft also becomes large. 3) Considering the special shape of the back burr, it becomes a structure that makes it easier to remove cutting chips. If you do not do this, you will not be able to perform cutting smoothly, and further,
4) For practical convenience, it is important that it is not necessary to change the size of the cutting blade for pipes of different sizes each time, and that it is easy to operate with a simple mechanism. Then, the present invention has been completed.

In order to achieve the above object, based on the above findings, the inner surface processing machine according to the present invention is a device for machining the inner surface of the cylindrical hollow portion of the object to be processed. A gripping device for gripping is provided at one end, and a base having a drive device having a rotary shaft extending toward the one end is provided at the other end, and a gripping device side extending on the base. Is equipped with a processing blade at the other end, and the other end is connected to the rotary shaft of the drive device through a universal joint and rotates axially, and the middle of the shaft is eccentric from the extension line of the rotary shaft and can be slid The eccentric position of the shaft with the universal joint as a fulcrum, provided with a support body that is supported by the rotation axis and that is rotatable about the extension line of the rotation axis and a rotation device that rotates the support body. And around the center of rotation of the rotating body And a swivel device that swivels the shaft in the same rotational direction as the axial rotation, and inserts the tip of the shaft into the hollow portion of the workpiece gripped by the gripping device to swivel the shaft while rotating the shaft. It is characterized in that the inner surface of the hollow portion is processed while being pressed by the processing blade.

The object to be processed according to the present invention is not limited in its outer shape as long as it has a cylindrical hollow portion whose inner surface needs to be machined. For example, a tubular member such as a pipe, a cylindrical member, etc. A cylindrical body having a rectangular outer shape and a cylindrical hollow portion. The processing blade used in the present invention means a tool for machining the inner surface of the cylindrical hollow portion of the workpiece, for example, a cutting tip, a grinder or the like. The present invention, by using a cutting tip as a processing blade, can be used as a cutting machine for the inner surface of a cylindrical hollow portion, and by using a grinder as a processing blade, the inner surface of a cylindrical hollow portion is polished. It can be used as a polishing machine. Also,
By using another type of processing blade, it can be used as an inner surface processing machine other than cutting or polishing.

A preferred embodiment of the present invention is characterized in that both or one of a driving device having a rotary shaft and a gripping device for gripping a workpiece can be moved back and forth in the axial direction of the shaft. . As a result, the machining blade at the tip of the shaft can be moved forward and backward relative to the surface to be machined of the object to be machined, so that the efficiency of machining becomes high.

In a further preferred embodiment of the present invention, a guide roller having a length equal to the distance from the axial center of the shaft to the peripheral edge of the working blade in the radial direction or a slightly longer length as an outer radius is used. It is characterized by being attached rotatably to the back.

Yet another preferred embodiment of the present invention is that the cutting oil is supplied to the surface to be processed from the end surface of the object to be processed, which is opposite to the shaft side, and is discharged from the end surface on the shaft side. It has a feature. As a result, the processing chips can be removed from the surface to be processed together with the cutting oil, so that the processing blade is
Processing can be performed more smoothly without being disturbed by processing waste.

A preferred application example of the inner surface processing machine according to the present invention is provided with a triangular cutting tip as a processing blade, and the cutting tip has one of its corners leading and one side of the triangle is the axis of the shaft. It is characterized in that the back burr formed on the inner surface of the work piece that is arranged parallel to the core and joined by the friction welding method is cut by the cutting tip.

[0013]

According to the present invention of claim 1 or 2, 1) the shaft is eccentrically supported by a support having a center on an extension of the rotary shaft of the drive unit, so that the machining blade at the tip of the shaft is processed. Can be pressed. 2) The shaft can be rotated (rotated) by the driving device, so that the surface to be processed can be processed by the processing blade. 3) By using the universal joint as a fulcrum, passing the eccentric position of the shaft, and causing the shaft to make a rotational motion (revolutionary motion) in the same rotation direction as the axial rotation along a circumference centered on the rotation center of the rotating body, While absorbing the effects of centrifugal force and bending of the shaft, even if the surface to be processed is at a deep position in the object to be processed and the dimensions of the hollow part are different, with one processing blade,
It is possible to quickly process the entire inner peripheral surface of the workpiece. That is, according to the present invention, by rotating the shaft around its axis and revolving in the same rotational direction, the inner surface of the workpiece can be machined smoothly and with a simple mechanism. Further, by advancing the driving device toward the gripping device or advancing the gripping device toward the shaft, the surface to be processed can be processed along the axial direction of the shaft.

According to the third aspect of the present invention, a guide roller having an outer radius equal to or slightly longer than the distance from the axial center of the shaft to the peripheral edge of the machining blade is provided behind the machining blade. By being rotatably attached, the movement of the machining blade is guided so that the machining surface can perform smooth machining without cutting the base material itself of the machining object.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An inner surface processing machine will be described below with reference to the accompanying drawings based on an embodiment in which the inner surface processing machine according to the present invention is used as a back deburring device for a pipe joined by a friction welding method. FIG. 1 is a side view showing an overall configuration of an embodiment of an inner surface processing machine, FIG. 2 is a schematic side view showing a state in which a cutting blade is attached to a shaft, FIG. 3 is a partial sectional side view of the cutting blade, and FIG. Is a partial cross-sectional side view of another cutting blade, FIG. 5 is a cross-sectional view showing the cutting state of the back burr when cutting is performed with the cutting blade shown in FIG. 4, FIG. 6 is a side view of the universal joint, and FIG. FIG. 8 is a front view of the swivel device and FIG. 8 is a front view illustrating the structure of the support of the swivel device.

The inner surface processing machine 10 of the present embodiment is an apparatus for cutting and removing the back burr of a tubular workpiece (hereinafter referred to as a pipe) W, and has a long frame base 12 and a base. 12, a shaft 14 extending in the longitudinal direction thereof, an electric motor 16 for axially rotating the shaft 14, and a shaft 1
A swivel device 18 that swivels the pipe 4 and a grip device 20 that grips the pipe W are provided.

The gripping device 20 is a known means for gripping the pipe W, and although not shown, a mechanism for pressing the outer circumference of the pipe in a radial direction from both sides of the pipe with a fluid pressure cylinder or the like, thereby gripping the pipe. It has become. During cutting, the pipe W is gripped such that the axial centerline of the pipe W coincides with the extension line of the rotating shaft of the electric motor 16 described later. In FIG. 1, a workpiece W to which two pipes are joined and a pipe W'to which an elbow is joined as a workpiece.
And are shown together.

A cutting blade 22 is attached concentrically to the shaft 14 as a processing blade at the tip of the shaft 14 on the side of the gripping device 20 as shown in FIG. 2 to cut the back burr on the inner surface of the pipe. , It is supposed to be removed. The cutting blade 22 is a commercially available product for a milling cutter as shown in FIG. 3, and is composed of a shank 24 and a head 26, and is located 120 ° apart from each other on the front surface in the traveling direction of the head 26. It is equipped with three triangular cutting tips 28 for right angle shoulder milling. In the present embodiment, the cutting tip 28 has one of its corners as a lead, and the cutting side 29 is arranged parallel to the axial center line of the cutting blade 22. As shown in FIG.
Collet chuck 30 provided at the tip of shaft 14.
By firmly holding the shank 24 with, the cutting blade 22 is securely fixed to the shaft 14. When a back burr is to be cut using a cutting blade 23 having a square cutting tip 31 having a cutting edge angle of 45 ° for plane cutting as shown in FIG. 4, as shown in FIG. Comes into contact with the back burr C over a long line, which increases the cutting resistance and prevents smooth cutting. In addition, in FIG. 5, the broken line indicates the back burr of the cut portion.

A guide roller 32 rotatable around the shank 24 is arranged behind the head 26. The guide roller 32 is composed of a cylindrical radial bearing,
It has an outer peripheral surface of a short width along the axial direction of the shaft 14, and has a length equal to the distance L between the edge of the cutting side of the cutting tip 28 and the center line of the cutting blade 22, or the cutting trace of the back burr. Considering the height, the outer radius R has a slightly longer length. Thereby, the cutting tip 28 and the guide roller 32
The outer peripheral surface of the guide roller 32 contacts the inner surface of the pipe at the same time, or the outer peripheral surface of the guide roller 32 contacts the inner surface of the pipe.
On the other hand, the cutting tip 28 is located slightly above the inner surface.
At the time of cutting, the cutting tip 28 is guided by the guide roller 32, and the back burr can be smoothly cut so as not to cut the pipe base material. The outer diameter of the collet chuck 30 is smaller than the outer diameter of the guide roller 32.

The other end of the shaft 14 is connected in series via a universal joint 34 to an extension shaft 44 of the rotating shaft of the electric motor 16, and when the electric motor 16 rotates, the shaft 14 is rotated clockwise. It is configured to rotate (rotate). The universal joint 34 is a joint that is used when the two axes intersect at an angle, and the angle can change during operation, and a commercially available product as shown in FIG. 6 can be used. Further, the bearing 42 is formed by the universal joint 34.
The extension shaft 44 is pivotally supported in the immediate vicinity of the position, and the shaft 14, which is described later and is pivoting around the universal joint 34, is reliably supported. With the above configuration, the shaft 14 can be axially rotated (rotated) clockwise by the rotation of the electric motor 16.

The electric motor 16 is slidable along a rail 36 arranged on the base 12 parallel to the rotation axis, and is gripped by turning a handle 40 of a known screw-type propulsion mechanism 38. The electric motor 16 can be advanced or retracted towards the device 20. Further, a transmission is attached to the electric motor 16 so that the number of rotations which avoids the resonance speed of the shaft 14 can be selected.
With the above structure, the cutting blade 2 attached to the tip of the shaft 14 while rotating the shaft 14 in the pipe.
2 can be advanced.

Incidentally, instead of the screw-in type propulsion mechanism 38 in which the handle 40 is rotated by hand, the electric motor 16 can be mechanically and automatically advanced and retracted by a fluid pressure cylinder or the like. Further, instead of moving the electric motor 16 forward and backward, the gripping device 20 may be placed on a slide base and the slide base may be moved forward and backward in the axial direction of the shaft 14, and further, the electric motor 16 and the gripping device 20.
Both may be freely moved back and forth.

As shown in FIG. 7, the swivel device 18 includes a support 46 for supporting the shaft 14, a rotating device 48 for rotating the support 46, a guide device 50 for guiding the rotation of the support 46, and a whole. And a pedestal 52 for supporting the. The gantry 52 is formed in a frame structure, and supports the support 46 and the guide device 50 on the upper part, and the electric motor of the rotating device 48 on the lower part.

As shown in FIG. 8, the support 46 includes a holding portion 54 for holding the shaft 14 rotatably, and a holding portion 54.
And a rotating body 56 that rotates integrally with the rotating body 56, and the outer periphery of the rotating body 56 is a guide device 50 including four rollers 58.
Is being guided by. The holding portion 54 has a through hole 6 in the center.
0, the shaft 14 is passed through the through hole 60, and the bolt / nut 6 is inserted at both ends with the through hole 60 sandwiched therebetween.
It is fixed to the rotating body 56 from the position 2. The rotating body 56 is composed of an outer peripheral portion formed of a short cylinder and a disk portion having an opening at the center, and its rotation center is arranged so as to be on an extension line of the rotation shaft of the electric motor 16, and its rotational movement is Guidance device 5
Guided by 0. Further, the rotating body 56 is provided with parallel long holes 64 at positions facing each other with the holding portion 54 interposed therebetween, and the holding portion 54 is provided at a position eccentric from the center of the rotating body 56 by passing a bolt / nut 62 through the long hole 64. Can be fixed and thus the shaft 14 can be positioned in an eccentric position. By adjusting the eccentricity of the shaft 14,
The surface pressure of the guide roller 32, that is, the force with which the cutting blade 22 presses the inner surface of the pipe can be adjusted. For example, the greater the eccentricity of the shaft 14, the stronger the surface pressure of the guide roller 32, that is, the force with which the cutting blade 22 presses the inner surface of the workpiece. The scales on the outer side of the elongated holes 64 are for eccentricity with accurate dimensions.

A sprocket 66 is provided on the outer peripheral surface of the short cylinder of the rotating body 56, and a chain 68 is stretched between the sprocket 66 and the rotating shaft of another electric motor described later.
The roller 58 of the guide device 50 is in contact with the outer peripheral surface of the short cylinder of the rotating body 56 behind the sprocket 66.

The rotating device 48 is composed of an electric motor 70 arranged under the pedestal 52 and a chain 68. When the electric motor 70 rotates, the shaft 14 turns clockwise when viewed from the electric motor 16 side. It is configured to exercise. The turning speed can be changed by changing the diameter (number of teeth) of the sprocket on the electric motor 70 side. Further, the swivel device 18 has a shaft 1 as a whole.
4 is movable along the axial direction, and the optimum location can be selected depending on the size of the pipe for removing the back burr. As a result, when the electric motor 70 is driven, the rotating body 56 rotates, and the shaft 14 passes through the eccentric position of the shaft 14 with the universal joint 34 as a fulcrum, and also in a circle around the rotation center of the rotating body 56. Along this, a turning motion (revolution motion) is performed.

The inner surface processing machine 10 is further provided with a cutting oil supply pipe 72 and a receiving tank 74 as a cutting waste discharging device. The cutting oil supply pipe 72 is a flexible pipe for supplying cutting oil, and is inserted into the end surface of the pipe opposite to the shaft 14. The supplied cutting oil flushes the cutting chips, is discharged together with the cutting chips from the end surface of the pipe on the shaft 14 side, and is received by the receiving tank 74. As described above, in the present embodiment, the cutting waste is pushed away in the direction opposite to the forward direction of the shaft 14 so that the cutting waste does not interfere with the cutting work of the cutting blade 22.

In this embodiment, due to the eccentricity of the shaft 14, the cutting blade 2 at the tip thereof is pressed against the inner surface of the pipe while being guided by the guide roller 32, and when the shaft 14 turns while rotating axially, the entire circumference of the inner surface of the pipe is covered. The back burr can be cut while traveling over. As a result, the back burrs of pipes of different sizes can be cut with the single cutting blade 22. Further, the propulsion mechanism 38 can move the shaft 14 forward in accordance with the progress of the cutting of the back burr. By rotating the rotation and the revolution movement of the shaft 14 in the same direction, for example, in the clockwise direction, the cutting tip 28 of the cutting blade body 22 can surely bite into the back burr, perform cutting, and repel chips. what if,
If the direction of rotation of the shaft 14 and the direction of revolution of the shaft 14 are opposite to each other, the cutting tip 28 is unlikely to bite into the back burr, and smooth cutting cannot be performed.

Experimental Example 1 A back burr of a 6-inch pipe was used under the following conditions in a device 10 of the above-described embodiment using a cutting tip for right-angled shoulder shaving manufactured by Fujimoto Kogyo Co., Ltd. under the trade name Nice Cut 50φ. Could be removed within 5 minutes from the start of cutting. Shaft length x inner diameter x outer diameter: 4 m x 30 mm x 46 mm Distance from universal joint to swivel device: 800 mm Shaft eccentricity: 25 mm Position of back burr: 3 m from the shaft side end face of the shaft Shaft speed (rotation) 910 rpm Swivel speed: 15 rpm Roller surface pressure 15 kgf Experimental example 2 Under the same conditions as in Experimental example 1 except that the eccentricity of the shaft was made small, the back burr of a 3-inch pipe was removed in 3 minutes without changing the cutting tip. I was able to. From the above experiment, the shaft rotation speed in the present embodiment is the most stable around 910 rpm from the relationship with the natural frequency, and the relatively low turning speed enables smoother cutting. It could be confirmed.

[0030]

According to the present invention, with the above construction, the shaft revolves while revolving around its axis, so that the centrifugal force due to the rotation of the shaft and the shaft can be obtained even when the surface to be machined is deep in the object to be machined. It is possible to press the surface to be processed by the processing blade while absorbing the bending of the workpiece, and to rapidly perform processing over the entire inner peripheral surface of the cylindrical hollow portion of the workpiece. In addition, by combining the revolving motion of the shaft and the rotation, the inner surface of the hollow part with a wide range of different dimensions can be made with one processing blade without switching the processing blade each time according to the size of the hollow part. Since machining is possible, it is possible to save the trouble of switching the machining blades each time the size of the hollow portion is different, and the work efficiency is high. INDUSTRIAL APPLICABILITY The inner surface processing machine of the present invention can be used for cutting processing, polishing processing, or other mechanical processing by changing the processing blade body, and its configuration is relatively simple, and the operation is also easy. It is easy and can process the inner surface of the workpiece without individual differences.

[Brief description of drawings]

FIG. 1 is a side view showing an overall configuration of an embodiment of an inner surface processing machine according to the present invention.

FIG. 2 is a schematic side view showing a state in which a cutting blade is attached to a shaft.

FIG. 3 is a partial cross-sectional side view of a cutting blade.

FIG. 4 is a partial cross-sectional side view of another cutting blade.

5 is a cross-sectional view showing a cutting state of a back burr when the cutting blade body shown in FIG. 4 is used for cutting.

FIG. 6 is a side view of a universal joint.

FIG. 7 is a front view of a turning device.

FIG. 8 is a front view illustrating a configuration of a support of the turning device.

FIG. 9 is a cross-sectional view of a pipe showing a back burr generated on a pipe joined by a friction welding method.

[Explanation of symbols]

 10 Example of Inner Surface Processing Machine According to the Present Invention 12 Base 14 Shaft 16 Electric Motor 18 Swinging Device 20 Grasping Device 22 Cutting Blade 24 Shank 26 Head 28 Cutting Tip 30 Collet Chuck 32 Roller 34 Universal Joint 36 Track 38 Propulsion Mechanism 40 Handle 42 Bearing 44 Extension shaft of rotary shaft 46 Support 48 Rotating device 50 Guide device 52 Frame 54 Holding part 56 Rotating body 58 Roller 60 Through hole 62 Bolt / nut 64 Long hole 66 Sprocket 68 Chain 70 Electric motor 72 Cutting oil supply Tube 74 receiving tank

Claims (5)

[Claims] 1. A device for machining an inner surface of a cylindrical hollow portion of a workpiece, wherein a gripping device for gripping the workpiece extends to one end portion and extends toward the one end portion. A base provided with a drive device having a rotary shaft at the other end, respectively, and a processing blade extending on the base and provided at the end on the gripping device side,
At the other end, a shaft that is connected to the rotary shaft of the drive unit via a universal joint and rotates about its axis, and the shaft middle is eccentric from the extension line of the rotation shaft to support slidably and the extension line of the rotation shaft. It is equipped with a support that is rotatable as the center of rotation and a rotating device that rotates the support.By rotating the support, the universal joint is used as a fulcrum to pass through the eccentric position of the shaft and to rotate the center of rotation of the rotor. It has a swivel device that swivels the shaft in the same rotational direction as the axial rotation along the circumference of the center, and the shaft tip is inserted by inserting the tip of the shaft into the hollow part of the workpiece held by the gripping device. The inner surface processing machine is characterized in that the inner surface of the hollow portion is processed while being pressed and pressed by the processing blade while being rotated. 2. The drive device having the rotating shaft and / or the gripping device for gripping the workpiece can be moved back and forth in the axial direction of the shaft. Inner surface processing machine. 3. A guide roller having an outer radius equal to or slightly longer than the distance from the axis of the shaft to the peripheral edge of the working blade in the radial direction is rotatably mounted behind the working blade. The inner surface processing machine according to claim 1 or 2, characterized in that. 4. The cutting oil is supplied to the surface to be processed from the end surface opposite to the shaft side of the object to be processed, and is discharged from the end surface on the shaft side. The inner surface processing machine according to any one of items. 5. The inner surface processing machine includes a triangular cutting tip as a processing blade, and the cutting tip is arranged such that one side of the triangle is a lead and one side of the triangle is parallel to the axis of the shaft. The inner surface processing machine according to any one of claims 1 to 4, wherein the back burr formed on the inner surface of the work piece joined by the friction welding method is cut by a cutting tip.