JP4514539B2 - Pipe cutting device and cutting method - Google Patents

Description

  The present invention relates to a pipe cutting device and a pipe cutting method using the pipe cutting device.

  Conventionally, as a method of cutting a pipe, a method of cutting a pipe with a gold saw, a method of fixing a pipe with a chuck and pushing a V-shaped punch from the top and cutting it, a slit in a separate process in advance of the punch insertion part A method of forming and slitting a V-shaped punch into this and a method of forming slits in two separate processes in advance at the upper and lower portions of the pipe and then pressing and cutting the V-shaped punch are adopted.

Further, as a pipe cutting method using a punch, the following pipe cutting method has been proposed. (See Patent Document 1)
That is, a punching punch having a flat plate shape and a blade portion having a width smaller than the diameter of the pipe, and a cutting blade having a blade portion equal to the blade portion of the drilling punch at the tip portion and gradually wider than the diameter of the pipe are formed. A chuck having a guide groove portion that allows the punching punch or the cutting punch to move up and down at right angles to the axis of the pipe is used so that the guide groove portion coincides with the cutting position of the pipe. A die that has a guide slit that is externally fitted to the pipe and has an outer diameter that approximates the inner diameter of the pipe and in which the blade portion of the drilling punch is inserted perpendicularly to the axis of the pipe on the outer periphery. After being inserted inside the pipe so as to face the blade of the punch, the punch is pressed onto the pipe through the guide groove of the chuck. Then, a slit corresponding to the shape of the punch is formed in the pipe, and then the punch is pulled out of the chuck from the pipe, and the die is moved to a position where it is removed from the guide groove portion of the chuck. The pipe cutting method is characterized in that the cutting punch is inserted into the slit of the pipe through the guide groove portion of the chuck, and the pipe is pressed by the cutting blade of the cutting punch and cut.
JP-A-3-161213 (page 3, FIG. 2)

  However, in the cutting with the conventional gold saw, the time required for cutting is long and cutting waste is generated. In the cutting with the punch, in both cases, the equipment is complicated and the equipment is expensive, and the number of processing steps for cutting is also high. Therefore, the time required for cutting is long, the cut surface becomes uneven, and if the number of cuts increases, the durability of the cutting edge cannot be maintained, and burrs occur on the cut surface, and the pipe is deformed. There was a problem to do.

  Further, since processing is performed with different punches at the same place in the cutting process, there is a problem that a cutting error occurs and the accuracy of the cut product and the appearance of the product are deteriorated.

  In order to solve the above-described problems, the present invention provides a die for fixing a pipe, and an end surface thereof is placed facing the die end surface so as to keep a slight clearance, and a Y-axis direction cutting portion and an X-axis direction cutting portion are provided. And a punch driving means for moving the punch in the Y-axis and X-axis directions, moving the punch in the Y-axis direction, cutting the pipe covered by the punch in the Y-axis direction cutting portion in the Y-axis direction, Next, the pipe cutting device is characterized in that it moves in the X-axis direction and cuts in the X-axis direction at the X-axis direction cutting portion.

  Further, the Y-axis direction cutting part is a pointed cutting part provided in a linear part facing the punch length direction, and the X-axis direction cutting part is a peripheral cutting part provided in each part of the punch cross-sectional periphery. Is a pipe cutting device.

  Moreover, the pipe cutting device is characterized in that a cutting portion is provided at a corner portion of the end face of the die.

  Also, a process of fitting the pipe to the punch, a process of moving the punch in the Y-axis + direction and cutting the pipe at the Y-axis direction cutting part, and a process of moving in the X-axis + direction and the X-axis direction cutting part Cutting the pipe at a step, moving in one direction of the X-axis and cutting the pipe at the X-axis direction cutting portion, and moving to one direction in the Y-axis and cutting the pipe at the Y-axis direction cutting portion A pipe cutting method, a step of fitting the pipe to the punch, a step of moving the punch in the Y-axis + direction and one direction, and cutting the pipe in the Y-axis direction at the Y-axis direction cutting portion; It is a pipe cutting method comprising a step of moving in the X axis + direction and one direction and cutting the pipe in the X axis direction at the X axis direction cutting portion.

According to the pipe cutting device of the present invention, the punch for cutting the pipe includes a cutting portion for cutting the pipe in the Y-axis direction and a cutting portion for cutting in the X-axis direction, and is externally mounted on the punch at the Y-axis cutting portion. The pipe is cut in the Y-axis direction and cut in the X-axis direction at the X-axis direction cutting part. First, the pipe is opened in the Y-axis direction at the Y-axis direction cutting part, and then cut in the X-axis direction. Since the part is cut while expanding the pipe sequentially from the part opened in the Y-axis direction, it is possible to prevent the generation of excess stress during pipe cutting and to obtain a good cut section. Also, it is possible to provide a pipe cutting device that is significantly improved in cutting size and accuracy as compared with the conventional device. Further, the pipe is cut in the Y-axis direction, which is the axial direction of the pipe, and then cut in the X-axis direction, which is the radial direction, at the Y-axis direction cutting portion of the punch, thereby cutting the pipe without leaving any cutting residue. Furthermore, since the equipment is simple and the number of man-hours required for cutting is small, it is possible to provide an inexpensive and highly productive pipe cutting device.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a plan view showing a pipe cutting device according to an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a side view, FIG. 4 is an enlarged view of the cutting device portion of FIG. FIG. 6 is an enlarged explanatory view showing the structure and operation of the upper and lower dies and the punch, FIG. 6 is an enlarged explanatory view showing the state when the pipe is mounted and the moving direction of the punch, FIG. FIG. 9 and FIG. 10 are explanatory views of cutting operation.

  In the figure, reference numeral 1 denotes a clamping device for gripping and fixing a pipe, which includes an upper die 1a and a lower die 1b. 2 is a die support frame on which the upper die 1a is installed, 3 is a power source support frame for clamping, 4 is a driving shaft for clamping that moves the upper die up and down, 4a is a power source for the driving shaft for clamping, and 5 is a lower die. Reference numeral 1 b denotes a support base, 6 denotes a base, and 7 denotes a support column erected between the base 6 and the support frame 3. The die support frame 2 is inserted through a column 7 and a bearing (not shown) so as to be movable up and down. 8 is a pipe fixing surface that is formed on the joint surface side of the upper and lower dies, and forms a cylindrical hole 1c for gripping and fixing the pipe, and 9 is a corner where the punch side end surface of the upper and lower dies and the pipe fixing surface 8 intersect. It is the die side cutting part formed in this. A cutting device 10 includes a punch 11. Reference numeral 12 denotes a flange that supports the punch 11, and the punch 11 is fixed to the end surface of the die. A punch holder 13 is fixed to a drive shaft for moving the X axis direction and the Y axis direction for moving the punch 11 in the X axis direction and the Y axis direction. 14 is an X-axis direction moving drive shaft, 14a is an X-axis direction moving drive source, 15 is a Y-axis direction moving drive shaft, and 15a is a Y-axis direction moving drive source.

  In the present embodiment, the punch 11 is formed of a cylindrical body having a cross-sectional spindle shape having a pointed linear portion facing in the length direction as shown in FIG. 5, and the cutting portion side of the upper and lower dies 1 a and 1 b. A peripheral cutting portion 16 is formed at a peripheral corner portion of the end face, and a sharp end cutting portion 17a, 17b is formed at a ridgeline formed by upper and lower sharp portions. The end surface of the punch 11 on the peripheral cutting portion 16 side maintains a slight clearance from the end surface on the cutting portion 9 side formed by the upper and lower dies 1a and 1b, and is centered with the cylindrical hole portion 1c formed by the upper and lower dies 1a and 1b. Are placed face to face to match. The clearance is appropriately changed according to the thickness of the workpiece 20 to be cut. Moreover, the diameter between the point cutting parts 17a and 17b of the punch 11 is set smaller than the inner diameter of the workpiece 20 to be cut. The workpiece 20 is loaded on the lower die 1b when the upper die 1a is lifted by the operation of the power shaft 4 for clamping. As shown in FIG. 6, the punch 11 is cut by the cutting length from the planned cutting line 20a of the workpiece 20. Inserted. The punch 11 is driven in the Y-axis direction and the X-axis direction during the cutting operation from the fixed position.

  The basic dimensions of the cutting edge shape of the punch 11 will be described with reference to FIG. The dimension a between the tip cut portions of the punch 11 is equal to or less than the inner diameter of the pipe, and the radius of curvature b of the arc portion c forming the peripheral cut portion 16 is equal to or greater than the radius of the pipe inner diameter. Are connected by a straight line portion d, and the angle formed by the straight line portion is e, and this angle e is appropriately determined by the dimensions of the punch defined by the above-mentioned a and b.

 Next, with reference to FIG. 8, the pipe cutting operation by the pipe cutting device of the present embodiment will be described.

First, a pipe as a workpiece is mounted between the upper and lower dies 1a and 1b, protrudes from the end face of the dies 1a and 1b to the punch 11 side by the length to be cut, and is externally fitted to the punch 11, and the upper and lower dies 1a, Grabbed and fixed by 1b.
Next, the pipe cutting operation will be described.

  In (1), the punch 11 is in a fixed position. When the punch 11 moves from the fixed position (1) in the Y + direction in the figure, the punch 11 hits the inner side of the workpiece 20 in (2), and the tip 11 of the punch 11 is cut. Cutting of the pipe 20 is started at the portion 17a. At this time, the tip cutting portion 16 of the punch has a sharp shape so that the pipe 20 is not deformed. Next, when the punch 11 moves in the Y + direction, the pipe 20 is cut while being sequentially expanded at the peripheral cutting portion 16 of the punch 11 in (3), and when the punch 11 moves in the Y + direction, the cutting point is ( Move from 3) to (4). The movement of the cutting point is greatly reduced because the cutting point moves while expanding gradually as a point.

Next, the punch 11 returns to the home position (1). The Y-direction cutting is performed in the same process. When the cutting punch 11 moves from the fixed position (1) in the X-direction, it reaches a cutting start point (5) that is a portion that has already been cut at the Y-axis direction cutting portion, and the peripheral cutting portion of the punch 11 from that portion. At 16 the cutting is started. This cutting start point (5) is the cutting end point (4) made by the movement of the punch by Y + and (Y−). When the punch further moves in the X-direction, the punch moves from the portion cut at the Y-axis direction cutting portion to the cutting points (6) and (7), and the cutting in the X-direction is completed. After the cutting is completed, it moves to (8) in the X-direction. In this way, the cutting in the X direction starts from the portion that has already been cut by the cutting in the Y direction, and the cutting is performed using the shear angle since the cutting proceeds while expanding in the same manner as in the Y axis direction. The force required for cutting is reduced.
Next, the punch returns to the home position (1). Cutting in the X + direction is performed in the same process. In the above cutting operation, the cutting operation on the punch side has been described. However, since the die side cutting portion 9 cuts the outside of the pipe 20 during the pipe inner cutting operation by the punch, the stress at the time of cutting can be further reduced. . By the above cutting operation, the accuracy of the product to be cut and the appearance of the product are improved, the force required for the cutting is reduced, the equipment becomes inexpensive, and the productivity can be improved.

Next, the pipe cutting operation process by the pipe cutting device of the present invention and the pipe cutting state by each process will be described.
Example 1
FIG. 9 shows an embodiment of a pipe cutting method using the pipe cutting device of the present invention.

First, the pipe 20 is externally fitted to the punch 11 on the lower die 1b by the cutting length, the upper die is lowered, and the pipe 20 is held and fixed between the lower die and the preparation for cutting is completed in (1). To do. Next, in step (2), the punch 11 is raised to cut the upper portion of the pipe 20, and in (3), the punch 11 is further raised to widen the cutting width. Next, in (4), the punch 11 moves leftward with the position in the Y direction as it is, and starts cutting in the X direction from the cut boundary. Next, in (5), the punch 11 further moves to the left, and the thickness of the pipe 20 is cut from the center of the pipe to the lower side. Next, at (6), the punch 11 moves to the right and starts cutting in the Y direction from the cut boundary. In (7), the punch 11 moves further to the right, and cuts the thickness of the pipe from the center of the pipe to slightly below. Next, at (8), the punch 11 returns to the center. At (9), the punch 11 descends to cut the lower part of the pipe, and the punch 11 further descends to widen the cutting width. In (10), the punch 11 moves to the left with the Y-direction position unchanged, and starts cutting in the X direction from the cut boundary. In (11), the punch 11 further moves to the left and completely cuts the thickness of the pipe. In (12), the punch 11 moves to the right and starts cutting from the cut boundary. 13), the punch 11 moves further to the left and completely cuts the thickness of the pipe. At (14), the punch returns to the center fixed position, and the cutting is completed. Next, the upper die 1a is raised, the clamp is opened, the pipe 20 is removed, and the cutting process of one cycle is completed.
(Example 2)
FIG. 10 shows another embodiment of a pipe cutting method using the pipe cutting device of the present invention.

  First, the pipe 20 is externally fitted to the punch 11 on the lower die 1b by the cutting length, the upper die 1a is lowered and the pipe 20 is held and fixed between the lower die 1b, and the preparation for cutting is completed in (1). To do. Next, in step (2), the punch 11 is raised to cut the upper portion of the pipe 20, and in (3), the punch 11 is further raised to widen the cutting width of the upper portion of the pipe. Next, at (4), the punch 11 returns to the center of the pipe, which is a fixed position, and at (5), the punch 11 is lowered to cut the lower part of the pipe. Next, at (6), the punch 11 is further lowered to widen the cutting width of the lower part of the pipe. Next, at (7), the punch 11 returns to the center position of the pipe. In (8), the punch 11 moves to the left and starts cutting from the upper and lower cut boundaries. In (9), the punch 11 further moves to the left, and the plate thickness of the pipe is completely cut off. Next, at (10), the punch 11 returns to the center position of the pipe, and at (11), the punch 11 moves to the right and starts cutting from the upper and lower cut boundaries. In (12), the punch 11 further moves to completely cut the plate thickness of the pipe, the punch 11 returns to the center fixed position, the upper die 1a rises, the clamp is opened, the pipe 20 is taken out, and one cycle cutting step Exit.

  In the pipe cutting device of the present invention, since the punch cutting part sequentially cuts the pipe from the part in contact with the pipe, it is possible to prevent the generation of excessive stress at the time of cutting the pipe and to obtain a good cut section. In addition, the cutting size and accuracy can be greatly improved as compared with the conventional apparatus, and the pipe is cut in the Y-axis direction, which is the axial direction of the pipe, at the tip cutting portion of the punch, and then the peripheral edge. By cutting in the X-axis direction, which is the radial direction at the cutting part, it is possible to cut the pipe without leaving any cutting residue, and furthermore, the equipment is simple and the number of man-hours required for cutting is small. Large pipe can be used as a pipe cutting device in various fields.

The top view of the pipe cutting device of this invention. The front view of FIG. The side view of FIG. The elements on larger scale of the punch part of FIG. The disassembled perspective view of the die | dye and punch of the pipe cutting device of this invention. Explanatory drawing which shows the moving direction of a punch. Explanatory drawing which shows the shape and basic dimension of a punch. Explanatory drawing which shows the cutting | disconnection operation | movement of a punch. Explanatory drawing which shows the cutting process of a punch. Explanatory drawing which shows the other cutting process of a punch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clamp apparatus 1a Upper die 1b Lower die 1c Hole 2 Support frame 3 Power source support frame 4 Clamping power shaft 4a Power source 5 Support base 6 Stand 7 Strut 8 Pipe fixing surface 9 Die side cutting part 10 Cutting apparatus 11 Punch 12 Flange 13 Punch holder 14 X-axis moving drive shaft 14a Drive source 15 Y-axis moving drive shaft 15a Drive source 16 Peripheral cutting portions 17a, 17b Pointed cutting portion 18 Cutting blade portion 20 Workpiece (pipe)
20a planned cutting line

Claims (5)

A die for fixing a pipe, an end face facing the die end face so as to maintain a slight clearance, a Y-axis direction cutting part, a punch having an X-axis direction cutting part, and a punch in the Y-axis and X-axis directions A punch driving means that moves in the direction of the Y-axis, moves the punch in the Y-axis direction, cuts the pipe covered by the punch in the Y-axis direction cutting portion in the Y-axis direction, then moves in the X-axis direction, and moves in the X-axis direction. A pipe cutting device for cutting in the X-axis direction from a portion cut in the Y-axis direction at the cutting part. The Y-axis direction cutting part is a pointed cutting part provided in a linear part facing the punch length direction, and the X-axis direction cutting part is a peripheral cutting part provided in a punch section peripheral corner. The pipe cutting device according to claim 1. The pipe cutting device according to claim 1 or 2, wherein a cutting portion is provided at a corner edge of the end face of the die. A pipe cutting method comprising a die for fixing a pipe, an end face facing the die end face so as to maintain a slight clearance, and a punch having a Y-axis direction cutting part and an X-axis direction cutting part, A step of fitting the pipe to the punch, a step of moving the punch in the Y-axis + direction, and a step of cutting the pipe in the Y-axis direction at the Y-axis direction cutting portion; a movement in the X-axis + direction; Cutting in the X-axis direction from the part cut in the Y-axis direction at the cutting part, moving in one direction of the X-axis, and cutting in the X-axis direction from the part cut in the Y-axis direction in the X-axis direction cutting part And a pipe cutting method comprising a step of moving in one direction of the Y axis and a step of cutting the pipe at the Y axis direction cutting portion. A pipe cutting method comprising a die for fixing a pipe, an end face facing the die end face so as to maintain a slight clearance, and a punch having a Y-axis direction cutting part and an X-axis direction cutting part. A step of fitting the pipe to the punch, a step of moving the punch in the Y-axis + direction and in one direction, and a step of cutting the pipe in the Y-axis direction by the Y-axis direction cutting portion; A pipe cutting method comprising a step of cutting in the X-axis direction from a location cut in the Y-axis direction at the X-axis direction cutting portion.

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