JP3829258B2 - Circular saw cutting device - Google Patents

Description

The present invention relates to a circular saw cutting device, and more particularly, to an improvement of a circular saw cutting device that raises a circular saw toward a workpiece held by a vice and cuts the workpiece.

  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.

The present invention provides a circular saw cutting apparatus of the type increasing the circular saw from below the workpiece, the position restriction in the vertical direction of the workpiece during cutting by the upper of the work, a flange which interferes with the work table An object of the present invention is to provide a circular saw cutting apparatus which can use a circular saw having a small diameter as unnecessary.

In order to overcome the above-mentioned problems and achieve the intended purpose, a circular saw cutting device according to the present invention includes:
A fixed vise that abuts and supports one side of the workpiece in the vicinity of 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 circular saw cutting device for cutting the workpiece by raising the circular saw toward the workpiece sandwiched by both vices,
The fixed vise and the movable vise are provided on the lower surface of the beam having rigidity extending horizontally above the workpiece cutting position, and the workpiece contact surface of the fixed vise and the workpiece contact surface of the movable vise are: As they move downward, the slopes that are close to each other are added,
Arrives Previous Symbol workpiece cutting position, both when the fixing device and the upper portion of the workpiece to be pushed up when they are pinched in the movable vice workpiece abutment surface is carried upward regulating contact, the load acting on the workpiece during cutting A workpiece support portion for supporting the above is provided on the lower surface of the beam .

According to the circular saw cutting machine according to the present invention, since the workpiece supporting portion for regulating a contact with a position on top of the work digits set, no longer requires a work rest which interfere with the flange is concerned, the circular saw Can be small. As a result, the rigidity of the circular saw is improved, the manufacturing unit price is suppressed, and the side runout can be further suppressed. Further, since it can use a small diameter of the circular saw, also becomes thin thickness of the circular saw, reduced cutting chips or the like produced during cutting, there are advantages such that the economics for cutting the number of work improves .

In addition, by providing the workpiece support to the beam of the circular saw cutting machine, can by supporting the workpiece with high positional accuracy by improving the rigidity of the workpiece support is, cutting accuracy, it is particularly improved cutting perpendicularity Figured. Furthermore, when the same size as the circular saw used in the conventional circular saw cutting apparatus shown in FIG. 8 is used, a larger workpiece can be cut.

Next, the circular saw cutting apparatus according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments. In the embodiment, as the circular saw cutting device according to the present invention, a circular saw cutting device for cutting a hollow pipe (workpiece) with a circular saw is illustrated, but the application range is not limited to this, It can also be used for cutting and cutting actual steel and wood. As a circular saw for cutting a workpiece, a cold saw, a tip saw or the like is used.

As shown in FIGS. 2 and 3, the circular saw 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 drive unit, and a pass line PL. A feed material mechanism 34 that intermittently feeds the upper pipe 12 to a workpiece cutting position (work cutting position) at a constant pitch, and a workpiece support portion 78 described below are provided on the lower surface, extending horizontally above the workpiece cutting position. It is basically composed of a beam 36 to be formed. 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, which is installed horizontally on the columns 56, 56 erected on the circular saw cutting device 26, is made of a highly rigid material such as a steel material, and below that the cutting portion of the pipe 12 by the circular saw 10 is located. It is supposed to be. 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 contact surfaces ( work contact surfaces ) 98 and 98 of the fixed vise 84 are slightly inclined downwardly toward the movable vise 86 on the lower surface of the beam 36. That is , 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, the site in contact with the side portion 12a of the fixing device 84 is a pipe 12, abutment surface 98, 98 that two inclined is formed, thereby performing the regulation of the horizontal direction of the pipe 12.

(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 12 to enter and is substantially U-shaped. There are provided two contact surfaces (work contact surfaces) 90, 90 that come into contact with each other. 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, both the contact surfaces 98, 98 on the fixed vise 84 side and the contact surfaces 90, 90 on the movable vise 86 side are provided with gentle slopes that approach each other as they go downward . When the pipe 12 is clamped at 86, a combined force that pushes the pipe 12 upward acts. 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 so that it 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 portion 78 is provided in a horizontal portion that is open below the fixed vise 84, and the upper portion of the pipe 12 that has reached the work cutting position is brought into contact with the work support portion 78. An upward positioning is performed. 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 by the work. It is securely held in place.

  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)
The pipe 12 the workpiece cutting sending the position feed material mechanism 34, as shown in FIGS. 2 and 4, intermittently to send feed material for feeding vise pipe 12 on pass line PL to the workpiece cutting position at a constant pitch 64, an auxiliary vice 68 for feeding material provided on the upstream side of the pass line PL, and sandwiching the lower end portion of the pipe 12, and an upstream side of the auxiliary vice 68 for feeding material, and the diameter of the pipe 12 And a feed roller 72 that adjusts the height position of the pass line PL. That is, the feed vise 64 for feeding material is provided above the side wall portion 74 parallel to the pass line PL of the circular saw cutting device 26, and reciprocates so as to sandwich the pipe 12 and feed it downstream at a constant pitch. It is supposed to be. 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 circular saw 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 is raised to lift the pipe 12, and the feeding vise 64 for feeding material clamps the pipe 12 and sends the pipe 12 to a workpiece cutting position by a predetermined amount. 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 contact surfaces 90 and 98 are inclined so as to be close to each other as they go downward, so that the pipe 12 is pushed upward, and the workpiece support portion 78 is surely attached. Abutted. 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 circular saw cutting device 26 according to the embodiment does not require the workpiece mounting table 16 that has been conventionally used, 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 both 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 workpiece 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. For this reason, the broken piece 102 is prevented from falling into the apparatus.

It is the schematic front view to which the cutting operation area | region of the circular saw cutting device concerning an Example was expanded. It is the perspective view which observed the whole circular saw cutting device concerning an example from diagonally back. It is a front view of the circular saw cutting device concerning an example. It is a top view of the circular saw cutting device concerning an example. It is a left view of the circular saw 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 circular saw cutting device shown in FIG. It is the schematic front view which expanded the cutting operation area | region in the conventional circular saw cutting device.

Explanation of symbols

10 Circular saw 12 Pipe (work)
12a side part 12b side part
36 beam 78 work support
76 Lifting frame 84 Fixed vise 86 Movable vise
90 Contact surface (work contact surface)
98 Contact surface (work contact surface)

Claims (2)

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 lifts the circular saw (10) toward the workpiece (12) sandwiched between both vices (84, 86). In the circular saw cutting device for cutting the workpiece (12),
The fixed vise (84) and the movable vise (86) are provided on the lower surface of a rigid beam (36) extending horizontally above the workpiece cutting position, and the workpiece contact of the fixed vise (84) The work contact surface (90) of the surface (98) and the movable vise (86) are respectively provided with inclinations that approach each other as they go downward.
Arrives Previous Symbol workpiece machining position, said upper top abuts the fixed vice (84) and the workpiece contact surface of the movable vice (86) work pushed up when they are clamped (98,90) (12) both Doing regulations, circular saw cutting, characterized in that <br/> provided on the lower surface of the time to the workpiece support to provide support for the load acting on the workpiece (12) to (78) cutting beam (36) apparatus. The circular saw cutting device according to claim 1, further comprising an elevating frame (76) for lifting the workpiece (12) and contacting the workpiece support portion (78) upstream of the workpiece cutting position.

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