JP2006110691A - Circular saw cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting device which dispenses with a workpiece mounting stand that interferes with a flange of a circular saw, and can employ a small-diameter circular saw. <P>SOLUTION: The circular saw cutting device is formed of a fixed vice 84 which is arranged in the vicinity of a workpiece cutting location of the cutting device, for abutting on and supporting one side 12a of a pipe 12, and a movable vice 86 which is reciprocatively movable with respect to the fixed vice 84, for abutting on and supporting the other side 12b of the pipe 12 in an advanced position. The cutting device is further formed of a workpiece support portion 78 which is arranged above the workpiece cutting location, abuts on an upper portion of the pipe 12 arriving at the workpiece cutting location to inhibit upward movement of the pipe, and supports load applied to the pipe 12. According to the structure of the cutting device, when both the vices 84, 86 pinch both sides 12a, 12b of the pipe 12 and at the same time the workpiece support portion 78 performs positioning of the upper portion of the pipe 12, the circular saw 10 is elevated from below the pipe 12, and cutting is carried out in this state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cutting apparatus, and more particularly, to an improvement of a cutting apparatus that raises a rotary cutting tool toward a work sandwiched by a vice and cuts the work.

  For example, in a conventional circular saw cutting device that cuts a pipe as a work with a circular saw, the pipe is placed on a work mounting table, and the fixed vice and the movable vice provided on each side with the cutting position interposed therebetween There is a type of holding a pipe and cutting a circular saw down from above the pipe. In this way, when the circular saw is lowered and cut, a part of the chips accumulates on the inner lower side of the pipe as the cutting progresses, so when cutting the lower half of the pipe, the teeth of the circular saw However, the pipe is cut while the accumulated chips are involved. For this reason, there existed a problem that a chip | wound might damage the cut surface of a pipe, or a tooth | gear of a circular saw was missing.

Therefore, as shown in Patent Document 1, there is known a circular saw cutting device that copes with the above problem by raising the circular saw from below the pipe and cutting it. FIG. 8 is a schematic view showing the cutting operation area of the cutting device 14 in an enlarged manner. The pipe 12 is placed on the work placing table 16, and the fixed vise 18 and the movable vise 20 are further pressed downward from above. In a state where the circular saw 8 is clamped by a vise (not shown) and fixed at the cutting position, the circular saw 8 is lifted from the lower side of the pipe 12 by appropriate driving means to perform cutting. In addition, a slit slightly larger than the saw thickness of the circular saw 8 is formed in the workpiece mounting table 16, the fixed vise 18, and the movable vice 20 so that the circular saw 10 can be allowed to pass during cutting. . In this cutting device 14, cutting proceeds from the lower side to the upper side of the pipe 12, and thus a part of the chips generated at the time of cutting is accumulated inside the pipe. However, since the circular saw 8 adopts a method of entering the pipe from the bottom of the pipe 12, the chips are located separately on both sides of the circular saw 8, and the teeth of the circular saw 8 are accumulated. Therefore, the possibility of continuing to cut the pipe while entraining the cut chips is reduced, and therefore the above-mentioned problem can be preferably solved.
JP-A-8-336719

  The circular saw is attached to the rotary shaft of the circular saw cutting device by sandwiching the circular saw from both sides with a pair of flanges. However, in the type of cutting device 14 that lifts the circular saw 8 from below the workpiece described in FIG. 8, the outer periphery of the flange 22 sandwiching the circular saw 8 is in the early stage of rising of the circular saw. Will interfere with the back of the. Therefore, a retracting portion (stolen portion) 24 that allows the approach of the flange 22 to the maximum extent is formed in a concave shape on the back surface of the workpiece mounting table 16, but even in that case, the conventional circular saw is lowered. The diameter of the circular saw 8 had to be made larger than that of the above.

  That is, as shown in FIG. 8, the radius R of the circular saw 8 required to completely cut the pipe 12 is at least the radius r of the flange 22, the thickness β of the stealing portion 24 of the workpiece mounting table 16, and the pipe 12. The diameter must be larger than the sum of the diameters α, and the diameter of the circular saw is inevitably larger by the thickness β of the stealing portion 24 than a cutting device of the type that lowers the circular saw 8 from above the workpiece. turn into. When the circular saw diameter is increased in this way, there arises a problem that the rigidity is lowered and the manufacturing cost is increased. Further, when the diameter of the circular saw is increased, the side runout of the circular saw 8 at the time of cutting increases, and the disadvantage that the cutting accuracy of the pipe 12 is lowered is also pointed out. Furthermore, if the circular saw diameter is increased, the thickness of the saw is also increased. Therefore, there is a disadvantage that the cutting allowance of the pipe is increased, which is uneconomical when a large number of cutting pieces are obtained.

  Therefore, the present invention eliminates the need for a work mounting table that interferes with the flange in a cutting apparatus that raises the rotary cutting tool from below the work by setting the vertical position of the work during cutting to be above the work. An object of the present invention is to provide a cutting apparatus that can use a rotary cutting tool having a small diameter.

In order to overcome the above-mentioned problems and achieve the intended purpose, a cutting apparatus according to the present invention comprises:
A fixed vise that abuts and supports one side of the workpiece near the workpiece cutting position, and a movable vise that can move forward and backward with respect to the fixed vise and that abuts and supports the other side of the workpiece when moving forward In a cutting device that cuts the work by raising the rotary cutting tool toward the work sandwiched between both vices,
An upper portion of the workpiece that has reached the workpiece cutting position is in contact with the upper portion of the workpiece that is positioned above the workpiece cutting position and is subjected to upper regulation, and a workpiece support portion that supports a load acting on the workpiece is provided. And

  According to the cutting apparatus according to the present invention, the work support unit that abuts on the upper part of the work and regulates the position is provided above the work cutting position, so that a work mounting table that is concerned about interference with the flange is required. The rotary cutting tool can be made small. Thereby, the rigidity of the rotary cutting tool is improved, the manufacturing unit price is suppressed, and the side runout can be further suppressed. In addition, since a rotary cutting tool with a small diameter can be used, the thickness of the cutting tool is reduced, cutting waste generated at the time of cutting is reduced, and the economic efficiency when cutting a large number of workpieces is improved. is there.

  Further, by providing the workpiece support portion on the beam of the cutting device, the rigidity of the workpiece support portion is improved and the workpiece can be supported with high positional accuracy, so that the cutting accuracy, particularly the cutting perpendicularity can be improved. . Further, when a tool having the same size as the cutting tool used in the conventional cutting apparatus shown in FIG. 8 is used, a larger workpiece can be cut.

  Next, a preferred embodiment of the cutting apparatus according to the present invention will be described below with reference to the accompanying drawings. In the embodiment, a circular saw cutting device for cutting a hollow pipe (workpiece) with a circular saw is exemplified, but the application range is not limited to this, and it is used for cutting and cutting solid steel materials and wood. Can also be adopted. The rotary cutting tool for cutting the workpiece is not limited to a circular saw such as a cold saw or a tip saw, and various types of rotary tools provided with blades extending in the radial direction at intervals of a required central angle are used.

  2 and 3, the cutting device 26 according to the embodiment includes a base portion 28 of the device main body, a cutting mechanism 32 including the circular saw 10 and the circular saw lifting and lowering drive unit, and a path line PL. Basically, a feed mechanism 34 that intermittently feeds the pipe 12 to a cutting position at a constant pitch, and a beam 36 that extends horizontally above the work cutting position and that has a work support portion 78 (described later) provided on the lower surface. It is configured. In addition, about the base part 28, the material feeding mechanism 34, and the cutting | disconnection mechanism 32 which are shown in an Example, it is not necessarily limited to what is demonstrated below, A conventionally well-known thing is employable suitably.

(About fixed vise)
The beam 36 installed horizontally on the support posts 56, 56 erected on the cutting device 26 is made of a material having high rigidity such as a steel material, and the cutting portion of the pipe 12 by the circular saw 10 is positioned below the beam 36. It has become. That is, as shown in FIGS. 1 and 4, on the lower surface of the beam 36, a fixed vise 84 that abuts and supports one side 12a of the pipe 12 at the workpiece cutting position, and is movable forward and backward with respect to the fixed vise 84. And a movable vise 86 that abuts and supports the other side portion 12b of the pipe 12 when moving forward. The workpiece contact surface of the fixed vise 84 is slightly inclined downward toward the movable vise 86 on the lower surface of the beam 36. Further, as shown in FIG. 6, a slit 84a slightly larger than the saw thickness is provided at the center position of the fixed vise 84 so as to allow passage of the circular saw 10, and as a result, Two inclined contact surfaces 98, 98 are formed at a portion where the fixed vise 84 contacts the side portion 12a of the pipe 12, and the pipe 12 is regulated in the horizontal direction.

(About movable vise)
As shown in FIG. 1 and FIG. 3, the movable vise 86 can move forward and backward along the longitudinal direction on the lower surface of the beam 36. Further, as shown in the plan view of FIG. 6, the movable vise 86 is formed with a slit 86a that allows the circular saw 10 to enter, and has a substantially U-shape. Two abutting surfaces 90, 90 that abut on the surface are provided. As shown in FIG. 1, the contact surfaces 90, 90 are also inclined so as to be inclined obliquely toward the fixed vise 84 side. That is, the contact surfaces 98, 98 on the fixed vise 84 side and the contact surfaces 90, 90 on the movable vise 86 side are also provided with a gentle inclination close to each other. When the pipe is clamped, a synthetic force that pushes up the pipe 12 is applied. As a result, the pipe 12 is reliably pressed against the workpiece support 78 described later.

  As shown in FIGS. 4 and 6, the movable vise 86 is connected to the piston 94 of the cylinder 92, and can move forward and backward along the longitudinal direction of the beam 36. In the embodiment, the slit 86a is provided on the pipe contacting side of the movable vise 86. However, the movable vise 86 and 86 may be provided on the left and right sides of the passage area of the circular saw 10, respectively. Good. The mechanism for moving the movable vise 86 back and forth is not limited to the illustrated cylinder 92, and various linear actuators may be employed.

(About work support)
As shown in FIGS. 1 and 3, the upper surface of the pipe 12 that has reached the workpiece cutting position is brought into contact with the lower surface of the beam 36 to perform upper regulation and to support a strong load acting on the pipe 12. A workpiece support portion 78 is provided. That is, the work support part 78 is provided in a horizontal portion opened below the fixed vise 84, and the upper part of the pipe 12 that has reached the cutting position is brought into contact with the work support part 78, thereby Is positioned. Therefore, at the time of cutting, the pipe 12 is supported in the horizontal direction by the fixed vise 84 and the movable vise 86, and is regulated upward by the work support portion 78, whereby the pipe 12 is cut. Is securely fixed.

  The work support portion 78 supports a large upward load acting on the pipe 12 when the circular saw 10 cuts the pipe 12. The work support portion 78 is used to support the rigidity of the beam 36 having rigidity. By providing on the lower surface, the load applied to the pipe 12 at the time of cutting can be reliably received. As shown in FIG. 5, since the slit support 96 is formed in the workpiece support 78, the raised circular saw 10 is allowed to enter. In the embodiment, the work support portion 78 is formed in the horizontal portion of the fixed vise 84. However, separately from the fixed vise 84, it is directly formed as a part of the beam 36, or has a beam-like rigidity. You may provide the workpiece | work support part 78 which has independently.

(About cutting mechanism)
The cutting mechanism 32 for raising the circular saw 10 from below the pipe 12 includes a pair of support members 38 and 38 erected on the base portion 28, the circular saw 10 and the circular saw, as shown in FIGS. By providing a saw motor 40, a swinging part 44 supported by both support members 38, 38 so as to be swingable via a support shaft 42, and swinging the swinging part 44 via a lifting mechanism 46. The motor 30 is configured to raise and lower the circular saw 10.

  The oscillating portion 44 is constituted by a gear box 48 having a substantially parallelogram in cross section and having a circular saw 10 at one end thereof, and a circular saw motor 40 provided below the gear box 48. The motor 30 is integrally swung in the vertical direction by a required central angle. As shown in FIG. 2, the rotation of the circular saw motor 40 is transmitted to a speed reduction mechanism 54 including pulleys 50 and 50 and a V-belt 52, and further from the speed reduction mechanism 54 via a gear box 48 to a required rotational speed. And then transmitted to the rotary shaft of the circular saw 10.

  As shown in FIG. 3, the elevating mechanism 46 is fixed to the bottom of the gear support 48 and a motor support case 58 that is swingably disposed on the support column 56 via a support shaft 57. And a fork 60 that pivotally supports the nut 100 and a ball screw 62 that is connected to the output shaft of the motor 30 in the motor support case 58 and screwed into the nut 100. The motor 30 rotates the ball screw 62 to give the nut 100 an advance and retreat movement in the axial direction, thereby giving a vertical feed to the fork 60 that supports the nut 100. The rocking portion 44 is swung in a vertical arc around the support shaft 42 of FIG. In other words, the circular saw 10 provided on the swinging portion 44 is raised and lowered together with the swinging portion 44.

(About the feeding mechanism)
As shown in FIGS. 2 and 4, the feeding mechanism 34 for feeding the pipe 12 to the cutting position includes a feeding vise 64 for feeding material that intermittently feeds the pipe 12 on the pass line PL to the cutting position at a constant pitch. The feeding auxiliary vice 68 provided on the upstream side of the pass line PL and sandwiching the lower end portion of the pipe 12, and provided on the upstream side of the feeding auxiliary vice 68 to match the diameter of the pipe 12 And a feed roller 72 for adjusting the height position of the pass line PL. That is, the feed vise 64 for feeding is provided above the side wall portion 74 parallel to the pass line PL of the cutting device 26 so as to reciprocate so as to sandwich the pipe 12 and feed it downstream at a constant pitch. It has become. Further, as shown in the left side view of FIG. 5, an elevating frame 76 for raising and lowering the pipe 12 is provided at a position adjacent to the feeding vise 64 for feeding material, and the pipe 12 is connected to the work support portion 78. It can come into contact with certainty.

  As shown in FIG. 5, the auxiliary vise 68 for feeding is always waiting on the upstream side of the pass line PL, and the pipe 12 becomes shorter as the cutting operation proceeds, and the pipe from the feed roller 72 is shortened. When the rear end of 12 is detached, the rear end of the pipe 12 is held. Further, the feed roller 72 provided on the upstream side of the pass line PL can hold the pipe 12 at a predetermined height and can smoothly feed the pipe 12. The feed roller 72 is configured such that its height can be adjusted according to the diameter of the pipe 12 to be cut. 5 indicates a chute for guiding the cut pipe 12 downward, and the pipe 12 guided by the chute 80 is collected in a collection box 82 disposed below. Further, the chute 80 can be moved by a moving means (not shown) to a position facing the inside of the apparatus over the circular saw 10 when the circular saw 10 is lowered. That is, as shown in FIG. 7, the chute 80 can be moved in the horizontal direction so that the chute 80 can be moved back and forth. As a result, the cut end 102 of the pipe 12 generated at the end of cutting is caught by the chute 80, and the cut end 102 is prevented from falling into the apparatus.

(Operation of Example)
Next, the operation of the cutting device 26 according to the embodiment will be described. First, the pipe 12 is set in the material feeding mechanism 34 and arranged on the pass line PL. At this time, the height position of the feed roller 72 is adjusted according to the diameter of the pipe 12 to be cut. The elevating frame 76 moves upward to lift the pipe 12, and the feed vise 64 feeds the pipe 12 to a cutting position by a predetermined amount while holding the pipe 12. At this time, since the upstream side of the pipe 12 is supported by the feed roller 72, the pipe 12 can smoothly move on the pass line. At this time, the auxiliary vice 68 for feeding material is in a standby state with the pipe 12 opened.

  When the pipe 12 is delivered to the workpiece cutting position, the movable vise 86 moves forward, and the pipe 12 is clamped by the contact surfaces 90 and 98 of both the vices 84 and 86. At this time, as shown in FIG. 1, the abutment surfaces 90 and 98 are inclined toward each other, so that the pipe 12 is pushed upward and is surely abutted against the workpiece support portion 78. That is, the pipe 12 is positioned in the horizontal direction by the fixed vise 84 and the movable vise 86 and is regulated upward by the work support portion 78 provided on the beam 36 having high rigidity. Even without using the workpiece mounting table 16, the pipe 12 is securely fixed at the workpiece cutting position.

  When the pipe 12 is fixed at the workpiece cutting position, the motor 30 rotates the ball screw 62 as shown in FIG. By the rotation of the ball screw 62, the fork 60 that supports the nut 100 is fed, and the circular saw 10 starts to rise as the swinging portion 44 swings around the support shaft 42. Then, as shown in FIG. 6, the circular saw 10 enters between the slits 84a and 86a of the fixed vise 84 and the movable vise 86, and the cutting of the pipe 12 is started. At this time, since a large load generated when the pipe 12 is cut is firmly supported by the work support portion 78 provided on the beam 36 having high rigidity, the pipe 12 does not vibrate, and high cutting accuracy is achieved. Can keep. Then, as shown in FIG. 5, when the circular saw 10 faces the cut portion 96 of the work support portion 78 and the pipe 12 is completely cut, the cut pipe 12 is guided to the chute 80, Collected in a collection box 82.

  That is, since the cutting device 26 according to the embodiment does not require the workpiece mounting table 16 that has been used conventionally, the flange 22 of the circular saw 10 does not interfere, and the circular saw 10 can be made small. As a result, the rigidity of the circular saw 10 to be used is improved, the manufacturing unit price is suppressed, and the side runout can be further suppressed. In addition, since the circular saw 10 having a small diameter can be used, the thickness of the circular saw 10 is reduced, and cutting waste generated at the time of cutting is reduced. Therefore, the economic efficiency when cutting a large number of pipes 12 is improved.

  During the cutting of the pipe 12, the feeding vise 64 for feeding material opens the pipe 12 and moves it by a predetermined amount to the upstream side, and clamps the pipe 12 again. When the pipe 12 is cut, the movable vise 86 is retracted, and the pipe 12 sandwiched between the vices 84 and 86 is opened. At the same time, the motor 30 rotates the ball screw 62 in the reverse direction, and the circular saw 10 descends from the cutting position. Then, the material feeding vise 64 resumes the feeding of the pipe 12. When cutting progresses and the end of the pipe 12 is detached from the feed roller 72, the auxiliary vice 68 for feeding material follows the pipe 12 while sandwiching the vicinity of the end of the pipe 12. As shown in FIG. 7, when the final cutting of the pipe 12 is completed and the circular saw 10 is lowered, the chute 80 is horizontally moved to the left by a driving means (not shown), and the upper end side of the chute 80 is the circular saw. It will face 10 above. Next, when the movable vise 86 is moved to the open side, the cut end 102 of the pipe 12 is released from both the vices 84 and 86 and falls and is caught by the chute 80. This prevents the broken piece 102 from falling into the apparatus.

It is the schematic front view which expanded the cutting | disconnection operation | movement area | region of the cutting device which concerns on an Example. It is the perspective view which observed the whole cutting device concerning an example from diagonally back. It is a front view of the cutting device concerning an example. It is a top view of the cutting device concerning an example. It is a left view of the cutting device concerning an example. It is the VI-VI sectional view taken on the line in FIG. It is the left view which expanded the cutting operation area | region of the cutting device shown in FIG. It is the schematic front view which expanded the cutting operation area | region in the conventional cutting device.

Explanation of symbols

12 Pipe (work)
12a side portion 12b side portion 78 work support portion 84 fixed vise 86 movable vise

Claims (1)

A fixed vise (84) that abuts and supports one side (12a) of the workpiece (12) in the vicinity of the workpiece cutting position, and can move forward and backward with respect to the fixed vise (84). A movable vise (86) that abuts and supports the other side (12b) of (12), and the rotary cutting tool (10) is directed toward the workpiece (12) sandwiched between both vices (84, 86). In a cutting device that raises and cuts the workpiece (12),
The workpiece support part is located above the workpiece cutting position, and the upper part of the workpiece (12) that has arrived at the workpiece cutting position comes into contact with the workpiece and is regulated upward and supports the load acting on the workpiece (12). (78) A cutting device characterized by being provided.

Images