JP2008207281A - End surface processing method and device of metallic pipe-end surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein it takes a long time to separately perform end surface processing on the right and left ends, and to deburr an inner and outer surfaces, since such a squareness failure and a product length failure of a pipe end surface frequently occur, and an end surface processing shape becomes nonuniform by vibration of a pipe, when performing the end surface processing of the thin pipe. <P>SOLUTION: A means stably processes an end surface without sliding by cutting force, by balancing the cutting force applied to a clamped metallic pipe, and by simultaneously cutting both right-left ends in a state of mutually rotating a pair of right and left cutting tools in the inverse direction on both ends of the metallic pipe. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a method and an apparatus for processing an end face of a metal tube with a cutting tool.

  A long metal blank manufactured by welding or pressing is attached to a rotating mandrel and is made a predetermined length by a rotary cutting tool (so-called rotary shear). It was dropped on paper and made into a product. In JP-A-09-285909 and JP-A-2004-174608, the end of the pipe is cut with a plurality of cutting tools. However, since a plurality of cutting tools are used, there is a limit to the accessibility to the metal tube. 2002-301617, JP-A-2000-271802, machining with a general-purpose bite or molded sandpaper depends on the pipe diameter and pipe thickness, so it is necessary to manufacture a tool for each pipe, and a large working force is applied to a metal pipe. Therefore, it could not be applied to thin-walled tubes.

In small-diameter thin metal tubes (thickness 0.02 to 0.3 millimeters) used for pressure rollers of electronic copying machines, the metal tubes are drawn into thin walls by spinning or drawing, and then cut. Since the end face deburring process relies on hand-finishing with a file, etc., the end face processing shape is not accurate, and vibration occurs during processing, so if you try to keep the shape accurate, the processing time will be low. It took a long time.

JP-A-2005-349550 JP 2004-174608 A JP 2002-301617 A JP2000-271802A JP 09-285909 A

  The long metal base tube is generally roughly cut by a so-called rotary shear using a rotating mandrel and a disk-shaped rotating tool. The end face of the rough-cut metal tube before processing becomes a rough surface due to so-called “burrs” such as material irregularities, fracture surfaces and shear droop. Deburring by cutting is not applicable to small-diameter pipes due to the accessibility of the bite. When using a total bite that matches the pipe diameter and pipe thickness, the bite depends on the pipe diameter and pipe thickness. In addition, a large cutting force was required and an excessive force was applied to the tube.

As a result, in the deburring operation, the end face processing shape becomes non-uniform due to the vibration of the pipe, or the squareness of the end face of the pipe is poor or the product length is poor, and deburring is difficult. In addition, since the work is performed at a low speed to prevent vibration during the end face processing or the left and right ends are separately performed, it takes a long processing time. Especially in the case of thin metal pipes, the rigidity is low and the end face is deformed by the processing force, and it is difficult to finish the end face accurately.

In order to solve the above-mentioned problem, after the tube is automatically positioned, the tube is restrained by a clamp, and both ends of the tube are processed by a pair of left and right counter-rotating tools. Since the working reaction forces of the left and right tools counteract each other, the clamping force of the pipe is dramatically reduced. When the cutting tool to be used is a total cutting tool, the type of cutting tool is less dependent on the pipe diameter variation as in the prior art, so the number of tool types is reduced and the machining force can be reduced. Since the guide surface is continuously formed outside the cutting blade surface, the complete bite can accurately guide the tube thickness center to the center of the blade surface even if there is a tube diameter error, eccentricity, or tube thickness error. Can be processed well. Since the clamp operates in conjunction with the positioning device, the machining setup time is short, and the inner surface of the clamp is an elastic body, so the tube does not wrinkle and the tube can be held following the guide of the cutting tool. Is accurate.

  The structure of each part of the end face machining apparatus of the present invention will be described below with reference to FIGS. The end surface processing units 7 and 8 include an end surface processing motor left 7-4, an end surface processing motor right 8-4, a unit slide left 7-5, and a unit slide right 8-5. The unit slide is moved forward and backward by the end surface processing air cylinders 7-3 and 8-3. There are a stroke stopper left 7-1 and a stroke stopper right 8-1 at the forward end, and the position of the end face machining unit is adjusted. The pipe positioning device 4 has a positioning claw 4-1 that can move in the X-axis direction. The lower clamp mold 2-1 supports the pipe 1 on which it is placed. The pipe presser device 5 has X-axis and Z-axis slides. The X-axis moves forward and backward, and the Z-axis moves to the right and the left with an air cylinder, and is used for positioning the pipe.

The pipe clamp device 2 is composed of a lower clamp mold 2-1 and an upper clamp mold 2-2, and the upper clamp mold 2-2 is moved up and down by the clamp air cylinder 2-3 to fix the pipe. The amount of movement of the end face machining unit is precisely regulated by the stroke stopper left and the stroke stopper right. In addition, the left and right cutting tools are attached to the left and right cutting tool holders at any angle, and the position and direction can be adjusted with respect to the pipe ends.

  The operation of the apparatus will be described below. The metal pipe 1 whose length is roughly cut is supplied onto the lower clamp mold 2-1 in the clamp device 2, and the positioning claw 4-1 of the pipe positioning device 4 and the press claw 5-1 of the pipe presser device 5 are provided. Then, the clamp device 2 is pressed from above and clamped by the upper clamp die 2-2. Next, a total cutting tool (hereinafter referred to as a cutting tool) left tool 3-1 and right tool 3-2 attached to the end face processing unit left 7 and the end face processing unit right 8 are rotated at the opposite ends of the metal tube 1. By approaching and cutting both ends, the length is accurately obtained and at the same time the end face is processed.

  As shown in FIG. 3, when the left cutting tool 3-1 and the right cutting tool 3-2 that cut both ends of the metal tube 1 rotate in opposite directions, and the left and right cutting are performed simultaneously, Since the cutting forces cancel each other by rotating in the opposite direction, the processing force applied to the tube is small, and the clamped metal tube 1 does not slip, and smooth end surface processing and generation of wrinkles on the tube surface can be suppressed.

  When the metal tube is directly restrained by the metal clamp molds 2-1 and 2-2, the clamped metal tube is easily slipped by the processing force, and the surface tends to be crushed. Therefore, as shown in FIG. By using the elastic body 2-4 having a large frictional force or by attaching an elastic film to the inner surface of the mold, it is possible to perform stable restraint while gently holding the metal tube.

  By fixing the metal tube with a clamp type and rotating the cutting tool, simultaneous end face processing of both ends of the asymmetrical tube becomes possible. For example, as shown in FIG. 4, both end faces can be processed at the same time even when the left and right axis centers are shifted or when the left and right axis centers are not parallel as shown in FIG.

  As shown in FIG. 8, the rake angle 9-1 is adjusted by adjusting the grinding angle of the cutting tool 3 and the clearance angle 9-2 and the horizontal tilt angle 9-3 are adjusted by the angle of the cutting tool holder 11, as shown in FIG. Is done. Further, the horizontal adjustment amount 9-5 of the cutting tool for changing the blade rotation diameter 9-4 is the mounting position of the cutting tool holder, and the forward / backward moving amount 9-6 of the cutting tool 3 is determined by tightening the cutting tool positioning bolt 12 and the holder 11 at the rear part of the cutting tool. Adjusted. By combining such adjustment functions, optimum settings can be made freely in three dimensions. By the three-dimensional setting of the cutting tool 3, the pipe end shape, squareness, and length accuracy are extremely improved.

  When the end surface of the metal tube is cut with a cutting tool, the metal tube is relatively thin. Therefore, the cutting tool is a total cutting tool matching the shape of the pipe end, and as shown in FIG. 5 and the groove 3-7, the rake angle is divided into two stages, the rake angle A3-3 is a normal rake angle blade surface, and the rake angle B3-4 of the guide surface is zero or a negative angle. Rather than aiming for material guidance. With such a cutting tool, efficient end face processing can be performed once.

  As shown in FIGS. 1 and 2, the rough-cut metal tube 1 before processing is supplied onto the lower clamp mold 2-1, and the positioning claw 4-1 of the pipe positioning device 4 and the pressing claw 5 of the pipe pressing device 5. After being set at a predetermined position by -1, the upper clamp die 2-2 is fixed, and the end face machining is performed by the left cutting tool 3-1 and the right cutting tool 3-2. These positioning operations are all performed automatically. Furthermore, as shown in FIG. 2, the end machining length of the entire product length is accurately controlled by the end machining air cylinders 7-3, 8-3 and the stroke stoppers 7-1, 8-1. A significant improvement is obtained.

  Since the system that clamps the general tool and the metal pipe is adopted, the equipment becomes simple, and as described above, the improvement in product quality and the improvement in efficiency are remarkable compared with the prior art.

  Since the end face processing is performed simultaneously with a bit that reverses the thin metal pipe to the left and right, the method of the present invention does not depend on the diameter or the thickness of the pipe, and the processing force is extremely small, and can automatically follow the error of the pipe This is particularly effective when applied to thin-walled small-diameter pipes.

  FIG. 9 shows the details of the end face processing dimensions of the metal pipe and the end face processing conditions shown in Table 1 using the end face processing apparatus of the present invention.

  The material of the metal tube is SUS304. Metal tube dimensions before rough cutting, diameter 10-2 is 20.0 mm, tolerance plus or minus 0.04 mm, thickness 10-3 is 0.15 mm, tolerance plus or minus 0.01 mm and length 10 -1 is 341 millimeters and the tolerance is plus or minus 0.04 millimeters. Product dimensions, diameter 10-2 is 20.0mm, tolerance plus or minus 0.04mm, thickness 10-3 is 0.15mm, tolerance plus or minus 0.01mm and length 10-1 is 340mm, Tolerance plus or minus 0.02mm. The metal tube end protrusion 10-4 before processing is 10 millimeters. The rake angle 9-1 is 20 degrees. The clearance angle 9-2 is 20 degrees. The horizontal tilt angle 9-3 is 5 degrees. The number of rotations per minute is 450. The bite feed rate is 30 millimeters per minute. Although the cycle time of the prior art was about 60 seconds, the end face machining cycle time of the proposed apparatus was 15 seconds, which was 25% of the conventional one.

  Examples of the metal tube that can be processed by the method of the present invention include a pressure roller for an electronic copying machine, a heating roller, an automobile exhaust pipe, or small containers.

It is a top view which shows the end surface processing apparatus outline | summary of this invention. It is a front view which shows the end surface processing apparatus outline | summary of this invention. It is explanatory drawing of the state which carries out end surface processing of the both ends of a metal pipe simultaneously. It is explanatory drawing in the case of carrying out end surface processing of the both ends of the asymmetrical pipe | tube with a shaft center shift simultaneously. It is explanatory drawing at the time of carrying out end surface processing of the both ends of the asymmetrical pipe | tube with an angle shift | offset | difference simultaneously It is a figure which shows the state which clamps a metal tube with an elastic body. It is the side view and front view which show the shape of the whole shape cutting-blade cutting edge It is the front view and side view for the setting method of a total form byte It is explanatory drawing which shows the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal pipe 2 Pipe clamp apparatus 2-1 Lower clamp type 2-2 Upper clamp type 2-3 Clamp air cylinder 2-4 Elastic body 3 Bit 3-1 Left bit 3-2 Right bit 3-3 Rake angle A
3-4 Rake angle B
3-5 Guide surface 3-6 Blade surface 3-7 Groove 4 Pipe positioning device 4-1 Positioning claw 4-2 Positioning air cylinder 5 Pipe presser device 5-1 Pressing claw 5-2 Pressing air cylinder X-axis 5-3 Pressing Air cylinder Z-axis 7 End face processing unit left 7-1 Stroke stopper left 7-2 Tool holder left 7-3 End face processing air cylinder left 7-4 End face processing motor left 7-5 Unit slide left 8 End face processing unit right 8-1 Stroke stopper right 8-2 Tool holder right 8-3 End face machining air cylinder right 8-4 End face machining motor right 8-5 Unit slide right 9-1 Rake angle 9-2 Relief angle 9-3 Bite lateral tilt angle 9- 4 Cutting edge rotation diameter 9-5 Left / right adjustment amount of byte 9-6 Forward / backward movement amount of byte 10-1 Length 10-2 Diameter 10-3 Thickness 10-4 End Projecting amount 11 toolholder 12 bytes positioning bolts

Claims (6)

An end face processing method and an end face processing apparatus for cutting end faces on both ends of a metal tube with a cutting tool (hereinafter, cutting tool is referred to as a cutting tool) that simultaneously rotate left and right oppositely. An end face processing method and an end face processing apparatus for cutting end face processing of a pipe end of an asymmetrical metal pipe at the same time on the left and right by rotating a cutting tool. An end face processing method and an end face processing apparatus for a metal pipe provided with a clamp type of the metal pipe and an automatic setting mechanism for the longitudinal position of the metal pipe. An end face processing method and end face processing equipment for a metal tube that can adjust the position and angle of the bite by changing the cutting edge rotation diameter of the bite, the amount of forward and backward movement of the bite, the rake angle, and the horizontal inclination of the bite. An end face processing method and an end face processing apparatus for a thin tube with a complete bit that cuts the end of the pipe at the groove portion of the bit that positions the blade surface guide surface with respect to the thickness center of the thin tube. When clamping the pipe in the end face processing of thin-walled pipes, the inner surface of the clamp mold is made an elastic body, or the elastic film is sandwiched between the pipe and the clamp mold to weaken the restraint of the pipe, and the pipe end is elasticized by the guide surface of the tool An end face processing method and an end face processing apparatus for performing centering with respect to the thickness and cutting evenly by deforming or moving.

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