JP2928471B2 - Cutting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting machine, and more particularly, a hydraulic cylinder for reciprocatingly driving a saw frame is provided between a saw frame equipped with a circular saw and a machine body to reciprocate the hydraulic cylinder. The present invention relates to a cutting machine for cutting a workpiece by moving a circular saw forward and backward with respect to a cutting position on a machine body.

[0002]

2. Description of the Related Art As described above, a cutting machine that reciprocates a saw frame back and forth with respect to a cutting position on a machine body by a hydraulic cylinder is conventionally provided with a swing type as shown in FIG. And a horizontal slide type as shown in FIG. That is, the swing type cutting machine is configured such that the lower end of the saw frame 2A equipped with the circular saw 1 is
And a hydraulic cylinder 5 is interposed between the upper end of the saw frame 2A and the upper part of the machine body 4, and the circular saw 1 is covered by the swinging motion of the saw frame 2A due to the reciprocating operation of the hydraulic cylinder 5. The cutting material W is reciprocated back and forth with respect to a cutting position P, and a horizontal slide type cutting machine slidably supports a saw frame 2B equipped with a circular saw 1 on a slide base 6 of a machine body 4. A hydraulic cylinder 5 is interposed between the frame 2B and the machine body 4, and the circular saw 1 is reciprocated back and forth with respect to the cutting position P by the horizontal reciprocating movement of the saw frame 2B due to the reciprocating operation of the hydraulic cylinder 5. is there.

By the way, in the cutting operation using such a cutting machine, a method for improving the operation rate of the cutting machine, that is, wasted time other than when the circular saw is cutting the workpiece W can be provided. One of the methods for making the saw frame shorter is to make the retreat speed of the saw frame 2A or 2B faster than the forward speed. In this case, the saw frame 2A or 2A
Since B has a considerable weight, if it is retracted at high speed, when the saw frame 2A or 2B is retracted, the piston and the cover mechanically collide with each other at the stroke end of the hydraulic cylinder. However, it is not preferable for the machine and the operator, because a large impact and noise are generated. Since the forward speed of the saw frame 2A or 2B is sufficiently lower than the retreat speed, there is no problem of impact when stopping at the forward limit position.

In order to reduce the impact at the retreat limit position of the saw frame as described above, a cushion device may be provided at the retreat side cylinder end of the hydraulic cylinder 5. Only circular saws of a certain diameter can be equipped. That is, in the conventional cutting machine, since the mounting portion of the hydraulic cylinder 5 on the machine body 4 side is provided integrally with the machine body 4, when the diameter of the circular saw changes, that is, when a circular saw having a different diameter is mounted. Since the position of the piston at the stroke end of the hydraulic cylinder 5 changes with the change of the reciprocating movement distance of the saw frame 2A or 2B, the saw frame 2A
Alternatively, the retreat limit position of 2B cannot always be set at the cylinder end, and therefore the cushion device cannot be applied.

Therefore, in the conventional cutting machine, the stop position of the piston at the retreat limit position of the saw frame is set at the cylinder intermediate portion of the hydraulic cylinder 5 like the forward limit position,
The stop of the piston at the backward limit position and the forward limit position of the saw frame is performed by a dog, a limit switch, and the like. FIG. 9 shows an example in which the retreat limit position of the saw frame is set at the cylinder intermediate portion of the hydraulic cylinder 5 in the horizontal slide type cutting machine, and the upper side of the figure shows the circular saw 1 having a relatively large diameter on the saw frame 2B. Is installed, when the saw frame 2B is at the retreat limit position as shown in the figure, the piston 7 of the hydraulic cylinder 5 is set so as to be located sufficiently away from the cylinder end. When the circular saw 1 is replaced and a circular saw 1 'having a smaller diameter is mounted on the saw frame 2B, the piston stop position at the retreat limit position of the saw frame is shifted to the lower side of FIG. As shown in the figure, the circular saw moves toward the center of the cylinder by the same length N as the moving amount N of the tip of the saw frame 2B due to the change in the diameter of the circular saw.

[0006]

In the conventional method in which the stop position of the piston at the retreat limit position of the saw frame is set at the middle portion of the hydraulic cylinder as described above, when the retreat speed of the saw frame is high, Due to the inertia of the saw frame, changes in the flow rate due to changes in the cylinder operating oil temperature, etc., the stop position when the saw frame retreats is not constant, and if the retreat amount is larger than the desired stop position, the dead time is There was a problem that it would increase.

In view of the above-mentioned problems, the present invention can accurately stop the saw frame at the retreat limit position when the saw frame is retracted even if the diameter of the circular saw changes, and can also adjust the piston at the retreat position. An object of the present invention is to provide a cutting machine capable of reducing impact.

[0008]

According to a first aspect of the present invention, a saw frame reciprocating drive hydraulic cylinder 15 is interposed between a saw frame 12A or 12B equipped with a circular saw 11 and a machine body 14, and a hydraulic cylinder 15 is provided. Circular saw 1 by reciprocating drive of cylinder 15
1 is moved forward and backward with respect to the cutting position P on the machine body 14 to cut the workpiece W. In the cutting machine, the cylinder mounting table 18 is mounted on the guide rail 16 provided on the machine body 14.
Is mounted so that it can slide, and this cylinder mount 18
The tube side or the rod side of the hydraulic cylinder 15 for reciprocating drive of the saw frame is pivoted on the rod side or the tube side of the hydraulic cylinder 15 on the saw frame.
The piston 17 is located at the cylinder end E at the retreat limit position of the saw frame 12B, and a cushion device 19 is provided at the cylinder end E.

According to a second aspect of the present invention, in the cutting machine according to the first aspect, a screw shaft 22 having a rotary operation handle 21 at a base end portion.
The guide rail 1 is attached to a support member 23 fixed to the body 14.
The cylinder mounting base movement adjusting mechanism 20 which supports the screw shaft 22 in a screw hole 24 provided in the cylinder mounting base 18 while supporting the rotation in parallel with the cylinder 6 and allowing only rotation. .

According to a third aspect of the present invention, in the cutting machine according to the first or second aspect, a part of the cylinder mounting base slidably in contact with the guide rail is separated from the main body and a locking piece.
8b, the distal end thread portion 29 of the lock shaft 27 having the rotation operation handle 26 at the base end is connected to the lock piece 18
b and screwed onto the main body 18a, and the locking piece 18b is pressed against the guide rail 16 by the rotational tightening of the lock shaft 27 to fix the cylinder mount 18 at a required position on the guide rail 16. 25 is provided.

[0011]

In the cutting machine according to the first aspect of the present invention, the hydraulic cylinder for reciprocating drive of the saw frame is reciprocated for a predetermined stroke S from the cylinder end E to the intermediate required portion F, so that the circular cylinder is reciprocated. The workpiece W can be cut by moving the saw 11 back and forth with respect to the cutting position P.
At this time, even if the saw frame 12A retreats at a high speed to the retreat limit position, the piston 1 at the cylinder end E is moved by the cushion device 19 provided at the cylinder end E.
7 is alleviated.

Thus, the circular saw 11 is, for example,
When replacing with a circular saw 11 'smaller in diameter than 1,
By moving the cylinder mount 18 by a predetermined length L or M corresponding to the radius difference between the circular saw 11 and the circular saw 11 ′, the retreat limit position of the saw frame 12 </ b> A is the same as that of the circular saw 11. It can be held at the cylinder end E.

According to the second aspect, when replacing the circular saw 11 with one having a different diameter, the cylinder mounting base 18 is moved along the guide rail 16 by appropriately rotating the screw shaft 22 by the rotating operation handle 21. The movement can be adjusted easily and easily.

According to the third aspect, when the circular saw 11 is replaced with a circular saw having a different diameter, the lock operation piece 26 rotates the lock shaft 27 in the tightening direction so that the locking piece 18b is pressed against the guide rail 16. Being
When the cylinder mount 18 is locked at a required position on the guide rail 16 and the rotation shaft 26 is loosened by rotating the rotation operation hand 26 in the reverse direction, the locking piece 1 is rotated.
8b is separated from the guide rail 16, and the lock is released. Therefore, the cylinder mount 18 can be easily locked and unlocked with respect to the guide rail 16 simply by rotating the handle 26.

[0015]

Embodiments will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the saw frame 12A is a swing type whose lower end is pivotally attached to a body 14 by a pivot 13. A circular frame driven by a motor 10 is provided on the upper side of the saw frame 12A. A saw 11 is provided, and a hydraulic cylinder 15 for reciprocating driving of the saw frame is interposed between the saw frame 12A and the machine body 14. A guide rail 16 is provided horizontally above the body 14 in a direction perpendicular to the material feeding direction of the workpiece W.
When the cylinder mount 18 is slidably mounted on the cylinder 6, the end of the cylinder tube 15 a of the hydraulic cylinder 15 for saw frame reciprocating drive is pivotally mounted on the cylinder mount 18 with the pin 8, and the piston rod 15 b Is pivotally connected to the upper end of the saw frame 12A with a pin 9.
The workpiece W is gripped and fixed at a cutting position P by a main vise 40 including a fixed vice jaw 40a and a movable vice jaw 40b.

This saw frame reciprocating drive hydraulic cylinder 1
5, saw frame 12A is formed by reciprocating piston 17 between a predetermined stroke S from cylinder end E (left end) to intermediate required portion F, as shown in FIG.
Is reciprocated between the position shown by the solid line and the position shown by the imaginary line to reciprocate the circular saw 11 with respect to the cutting position P. When the saw frame 12A is at the retreat limit position as shown by the solid line, Piston 17 is rod end cylinder end E
It is configured to be located at. In this case, the retreat speed of the saw frame 12A is set to be sufficiently higher than the forward speed. And, in this cylinder end E,
Cushion device 1 for reducing impact of piston 17
9 (see FIG. 5). In this case, saw frame 1
Although the forward limit position of 2A is located in the middle portion of the cylinder, the forward speed of the saw frame 12A is sufficiently lower than the retreat speed, so that the stop of the saw frame 12A at the forward limit position is performed by a stop means such as a limit switch. It is assumed to be performed using

The cylinder mount 18 is provided with a cylinder mount moving mechanism 20 as shown in FIGS. The movement adjusting mechanism 20 supports a screw shaft 22 having a rotation operation handle 21 at a base end thereof on a support member 23 fixed to the body 14 so as to be parallel to the guide rail 16 and to be rotatable only. 22 is screwed into a screw hole 24 provided in the cylinder mounting base 18, and the cylinder mounting base 18 is easily and easily moved along the guide rail 16 by rotating the screw shaft 22 by the rotation operation handle 21. Can be adjusted.

Further, the cylinder mount 18 is connected to the guide rail 1.
6. A lock mechanism 25 for locking to a required position on
As shown in FIG. 1, they are provided at both ends of the cylinder mount 18. As shown in FIG. 2, each lock mechanism 25 includes a cylinder mount 18 that slides on the guide rail 16.
And a lock piece 18b formed by cutting off a part of the main body 18a of the cylinder mount 18 and a lock shaft 27 having a rotation operation handle 26 at the base end. On the side, a small diameter shaft portion 28 and a screw shaft portion 29 having a smaller diameter than the small diameter shaft portion 28 are provided. The small diameter shaft portion 28 of the lock shaft 27 is
a into the through hole 30 and the screw shaft portion 29 into the main body 1.
8a and screwed into the screw hole 31 of the rotary operation hand 2.
By rotating the lock shaft 27 in the tightening direction by means of 6, the locking piece 18b is pressed against the side surface of the guide rail 16 as shown in FIG. When the lock shaft 27 is loosened by rotating the rotation operation hand 26 in the opposite direction to release the lock piece 18b from the guide rail 16, the lock is released. By rotating the rotation operation handle 21 of the mechanism 20, the cylinder mount 18 can be slid freely along the guide rail 16.

The cushion device 19 has a well-known structure. For example, as shown in FIG. 5, an annular member surrounding the piston rod 15b is provided inside the rod-side cover portion 15c of the hydraulic cylinder 15 for saw frame reciprocating drive. Guide portion 32 and orifice portion 3 communicating with guide portion 32
3, a cushion adjusting valve 34 for adjusting the orifice portion 33, and a communication passage 35, and a cushion plunger 36 which can protrude into the annular guide portion 32 at the end of the piston rod 15b on the piston 17 side. It becomes. Reference numeral 37 denotes a supply / discharge port provided on the rod-side cover 15c, and reference numeral 38 denotes a supply / discharge port of the head-side cover 15d.

Accordingly, when the piston 17 approaches the cylinder end when the saw frame 12A retreats and the cushion plunger 36 protrudes into the annular guide portion 32, pressure is applied to the cushion chamber 39 which is cut off between the piston 17 and the cover 15c. Occurs and the piston 17 at the cylinder end
Shock is absorbed and alleviated. As the cushion device of the saw frame reciprocating drive hydraulic cylinder 15, various devices other than the cushion device 19 having the above structure can be used. Further, this cushion device is provided as a commercial product integrated with the cylinder by being pre-installed at one or both stroke ends of the cylinder without special attachment to the hydraulic cylinder. Commercially available hydraulic cylinders may be used.

When using the cutting machine having the above-described structure, as shown in FIG. 3, the saw cylinder reciprocating drive hydraulic cylinder 15 is moved by a predetermined stroke S from the rod side cylinder end E to the intermediate required portion F. The circular saw 11 is moved back and forth with respect to the cutting position P through the saw frame 12A by reciprocating the workpiece W to cut the workpiece W. At this time, even if the saw frame 12A retreats at high speed from the forward limit position shown by the imaginary line to the retreat limit position shown by the solid line,
That is, even if the piston 17 of the hydraulic cylinder 15 moves back from the position F to the rod-side end E at high speed, the impact of the piston 17 at the end E is reduced by the cushion device 19 provided at the rod-side cylinder end E. Is done.

Next, as shown in FIG. 4, when replacing the circular saw 11 with a circular saw 11 'having a smaller diameter, the lock mechanism 25 is unlocked, and the cylinder mounting base movement adjusting mechanism 20 is used. By simply moving the cylinder mount 18 from the position shown in the phantom line to the position shown in the solid line by a predetermined length L in the right direction corresponding to the radius difference between the circular saw 11 and the circular saw 11 ', the hydraulic cylinder 15 The piston 17 can be held by the cylinder end E at the retreat limit position of the saw frame 12A as in the case of the circular saw 11 shown in FIG. After the movement of the cylinder mount 18 has been adjusted, the cylinder mount 18 may be locked by the lock mechanism 25.

While the cutting machine having the swing type saw frame 12A has been described above, FIG. 6 shows a cutting machine having the horizontal slide type saw frame 12B, and the guide rail 16 provided on the body 14 is shown. Cylinder mounting base 18
Is mounted so that it can slide, and this cylinder mount 18
The tube side of the hydraulic cylinder 15 for reciprocating drive of the saw frame is pivotally mounted on the
4 is pivotably mounted on a saw frame 12B slidably supported on the saw frame 4 and the piston 17 is located at a cylinder end E at a retreat limit position of the saw frame 12B. (See FIG. 5).

In order to replace the circular saw 11 with a circular saw 11 'having a smaller diameter in this horizontal slide type cutting machine, as shown in the lower part of FIG. The piston 17 of the hydraulic cylinder 15 may be moved to the right in the figure by a length M corresponding to the radius difference between the saw 11 and the circular saw 11 '. The saw frame 12B can be held by the cylinder end E at the retreat limit position.

In the above embodiment, the tube side of the saw frame reciprocating hydraulic cylinder 15 is pivotally attached to the cylinder mount 18 and the rod side thereof is connected to the swing type saw frame 1.
2A (or the horizontal sliding saw frame 12B), the piston rod 15b side (rod side) of the saw frame reciprocating hydraulic cylinder 15 is connected to the cylinder mount 18 as shown in the embodiment of FIG. To the tube 15
The side a may be pivotally connected to the saw frame 12A (or 12B). Also in this cutting machine, for example, when replacing the small-diameter circular saw 11 'with the large-diameter circular saw 11, similarly to the embodiment shown in FIG.
Is moved by a predetermined length L from the position shown in the solid line to the position shown in the phantom line in the same direction to the left in the figure in accordance with the radius difference between the circular saw 11 'and the circular saw 11, so that the piston 17 of the hydraulic cylinder 15 Can be held by the cylinder end E at the retreat limit position of the saw frame 12A in the same manner as when the small diameter circular saw 11 'is mounted.

[0026]

According to the first aspect, when the saw frame is retracted, the saw frame can be accurately stopped at the retreat limit position, and the impact of the piston at the retreat position can be reduced. When the circular saw is replaced with a circular saw having a different diameter, the retreat limit position of the saw frame can be easily and easily adjusted by moving the cylinder mount.

According to the second aspect, when the circular saw is replaced with a circular saw having a different diameter, the cylinder mounting base can be easily and easily moved and adjusted along the guide rails simply by appropriately rotating the screw shaft with the rotary operation handle. can do.

According to the third aspect, when the circular saw is replaced with a circular saw having a different diameter, only by rotating the handle,
The cylinder mount can be easily and easily locked and unlocked with respect to the guide rail.

[Brief description of the drawings]

FIG. 1 is a front view of a swing type cutting machine showing one embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line XX of FIG.

FIG. 3 is a front view illustrating the operation of the cutting machine shown in FIG.

FIG. 4 is a front view showing an attached state of a hydraulic cylinder when the circular saw is replaced with a circular saw having a different diameter in the cutting machine shown in FIG. 1;

FIG. 5 is an enlarged sectional view showing the cushion device.

FIG. 6 is a front view showing a mounting state of a hydraulic cylinder when a circular saw is replaced with a circular saw having a different diameter in a horizontal slide type cutting machine.

FIG. 7 is a front view showing an embodiment when the rod side of the hydraulic cylinder is pivotally attached to a cylinder mount in the swing type cutting machine.

FIG. 8A is a front view showing a conventional swing type cutting machine, and FIG. 8B is a front view showing a conventional horizontal slide type cutting machine.

FIG. 9 is a front view showing a mounted state of a hydraulic cylinder when a circular saw is replaced with a circular saw having a different diameter in a conventional horizontal slide type cutting machine.

[Explanation of symbols]

 Reference Signs List 11 circular saw 11 'circular saw 12A saw frame (swing type) 12B saw frame (horizontal sliding type) 13 pivot axis of saw frame 14 airframe 15 hydraulic cylinder for saw frame reciprocating drive 15a cylinder tube 15b piston rod 15c rod side cover 15d head Side cover 16 Guide rail 17 Piston 18 Cylinder mount 18a Main body 18b Lock piece 19 Cushion device 20 Cylinder mount movement adjustment mechanism 21 Rotation operation handle 22 Screw shaft 23 Support member 24 Screw hole 25 Lock mechanism 26 Rotation operation handle 27 Lock shaft 29 Screw shaft part P Cutting position W Workpiece

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) B23D 45/04 B23D 47/10 B23D 47/00 B27B 5/18-5/20

Claims (3)

(57) [Claims] 1. A saw frame reciprocating drive hydraulic cylinder is interposed between a saw frame equipped with a circular saw and a machine body, and the reciprocating operation of the hydraulic cylinder moves the circular saw forward and backward with respect to a cutting position on the machine body. In the cutting machine which cuts the material to be cut, the cylinder mounting base is slidably mounted on a guide rail provided on the machine body, and the cylinder side of the saw frame reciprocating drive hydraulic cylinder is mounted on the cylinder mounting base. The rod side is pivotally connected, the rod side or tube side of the cylinder is pivotally connected to the saw frame, and the piston is located at the cylinder end at the retreat limit position of the saw frame. A cutting machine characterized by being provided. 2. A screw shaft having a rotation handle at a base end thereof is supported on a supporting member fixed to a cylinder mount so as to be rotatable only in parallel with the guide rail, and this screw shaft is mounted on the cylinder mount. 2. The cutting machine according to claim 1, further comprising a cylinder mounting base movement adjusting mechanism screwed into the provided screw hole. 3. A part of a cylinder mounting base that slides on a guide rail is separated from another mounting base part to form a locking piece, and a tip screw part of a lock shaft having a rotation operation handle at a base end is provided. A locking mechanism which is screwed from the locking piece to the other mounting base and presses the locking part against the guide rail by rotating and tightening the lock shaft to fix the cylinder mounting base at a required position on the guide rail. The cutting machine according to claim 1 or 2, further comprising: