JPH0790418B2 - Cutting device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a cutting device such as a horizontal band saw machine, and more particularly to a device for preventing inadvertent lowering of a cutting head having a band saw blade. Related to the cutting device.

[Technical Background of the Invention and Problems Thereof] As is well known, in a relatively large horizontal band saw machine, a cutting head having a band saw blade for cutting a work piece on a work table is erected on a base. It is guided up and down by the main guide post. The vertical movement of the cutting head is performed by an elevating cylinder provided near the main guide post. Stopping the descent while the cutting head is raised is performed by a configuration in which the solenoid valve provided in the control circuit of the lifting cylinder is maintained in a closed state or a configuration in which a check valve is provided in the control circuit.

In the conventional structure as described above, there is a slight leak in the control circuit, and for example, it may drop about 0.1 mm per minute. However, in the past, since the cutting head was not fixed in a state of being raised for a long time, there was no big problem. However, when a workpiece is cut horizontally by a band saw blade provided on the cutting head, it is necessary to securely fix the cutting head at an arbitrary fixed position.

[Object of the Invention] The present invention has been made in view of the above problems,
An object of the invention is to provide a cutting device capable of securely fixing and maintaining the cutting head at an arbitrary height position.

[Summary of the Invention] In order to achieve the above object, in the present invention, a cutting head supporting a band saw blade for cutting a material placed on a work table is erected on a base. It is installed on the main guide post so that it can move up and down.
The cutting head is equipped with a brake device that presses the friction member against the main guide post or the cutting head support member provided in parallel with the main guide post.

[Embodiment] Referring to FIG. 1, FIG. 2, and FIG. 3, the cutting apparatus 1 in this embodiment schematically mounts an extremely large workpiece (workpiece) W such as an ingot. A work table 3 to be placed is provided on a base 5, and a vice device 7 for holding and fixing the work piece W is provided on the base 5. Further, a guide column device 9 is erected on the base 5, and a cutting head 13 supporting a band saw blade 11 for cutting a work piece W is vertically movable in the guide column device 9 and can be moved back and forth. It is movably supported in a direction (a direction perpendicular to the paper surface in FIG. 1 and a left-right direction in FIG. 2).

In the vertical configuration, the work piece W is placed on the work table 3 and the work piece W is moved by the vise device 7.
After gripping and fixing the workpiece, the tooth tip of the band saw blade 11 is held vertically downward, and the cutting head 13 is lowered to allow the workpiece W to be cut by the band saw blade 11.
It will be appreciated that vertical cuts in the can be made.

Further, the band saw blade 11 is twisted horizontally so that the tooth tips of the band saw blade 11 are directed forward or backward, and the work table 3 or the cutting head 13 is moved in the front-back direction to move the band saw relative to the workpiece W. It will be appreciated that by making a cut in the blade 11, a horizontal cut of the work table W can be made.

The base 5 is formed by appropriately combining, for example, H-shaped steel, grooved steel, and the like into a square shape. The left and right side portions of the upper surface of the base 5 have left and right sub bases 15, respectively.
The R and 15L are further integrated together. That is, the overall configuration of the base is such that the recesses 17 in the front-rear direction are formed between the left and right sub-bases 15R and 15L.

On the upper surface of the work table 3 on which the work piece W is placed, a plurality of sleepers 19 for maintaining an appropriate clearance between the lower surface of the work piece W and the upper surface of the work table 3 are placed so that their positions can be adjusted. The work table 3 is movable in the front-rear direction.

That is, a plurality of sleeper members 21 are arranged at front and rear positions of the recess 17 and the base 5 in the base, and each sleeper member 21 supports a guide rail 23 extending in the front-rear direction. A plurality of wheels 25 are rotatably mounted on the work table 3 so as to roll on the guide rails 23. Further, in order to restrict the movement of the work table 3 in the left-right direction orthogonal to the longitudinal direction of the guide rail 23, a holding roller for holding one guide rail 23 from the left-right direction is rotatably provided.
Further, the work table 3 is provided with a rack rod 27 extending in the front-rear direction, and the rack rod 27 has a pinion gear 31 rotated by a front-back movement servomotor 29 mounted on the base 5. Are in mesh.

With the above configuration, when the pinion gear 31 is rotated in an appropriate direction by the servo motor 29 for moving back and forth, the rack rod is moved.
It will be appreciated that the work table 3 can be moved back and forth via 27.

Although not shown in detail, the moving position of the work table 3 in the front-rear direction can be easily detected by using an appropriate position detecting device, for example, an appropriate linear scale such as a linear induct thin. ,Also,
For example, the work table 3 can be accurately moved and positioned in the front-rear direction by feedback control or the like.

The vice device 7 for gripping and fixing the workpiece W
Includes a reference side vise 33 and a pressing side vise 35 mounted on the left and right sub-bases 15R and 15L, and the reference side vise 33 and the pressing side vise 35 face each other with the work table 3 interposed therebetween. Is provided.

As the vise device 7 is movable in the front-back direction,
A guide member 3 in the front-back direction is provided on each of the sub-bases 15R and 15L.
7R, 37L are provided, each guide member 37R, 37L,
The support sliders 39R and 39L on the reference side vise 33 and the pressing side vise 35 are movably supported in the front-rear direction, respectively. Although not shown, the left and right support sliders 39R, 39L are moved back and forth by, for example, the operation of a rack and pinion mechanism, a screw mechanism, or a fluid pressure cylinder, and the left and right support sliders 39R, 39L are synchronized. It is configured to move back and forth.

In order to grip and fix the work piece W placed on the work table 3, the left and right support sliders 39R, 39R are provided.
L has a pair of slide bars 41 that can reciprocate in the left and right directions.
R, 41L is supported. A reference vice jaw 43 and a pressing vice jaw 45 are attached to the end portions of the slide bars 41R and 41L facing each other.

In order to slightly reciprocate the reference vise jaw 43 in the left-right direction, a mini-cylinder 47 is attached to the support slider 39R of the reference-side vise 33. The tip end of the piston rod 49 of the mini-cylinder 47 has a reference vise jaw. It is connected to 43.

Further, in order to reciprocate the pressing vise jaw 45 in the left-right direction, a nut member 51 is attached to the support slider 39L in the pressing-side vise 35, and a screw rod 53 extending in the left-right direction is screwed on the nut member 51. It is matched. This screw rod 53
Is rotatably supported by a cover bracket 55 attached to the end of the slide bar 41L, and has a screw rod 53.
Are connected to a hydraulic motor 57 mounted on the cover bracket 55.

With the above-described structure, the reference vise jaw 43 is slightly moved in the left-right direction by operating the mini-cylinder 47, and the hydraulic motor 57 is driven to press the pressing vise via the screw rod 53 and the nut member 51. The jaw 45 is largely moved left and right. Therefore, by appropriately operating the mini-cylinder 47 and the hydraulic motor 57, the workpiece W is gripped by the reference vice jaw 43 and the pressing vice jaw 45, or the grip is released. The forward and backward movements of the support sliders 39R and 39L in the reference side vise 33 and the pressing side vise 35 are both in the state where the workpiece W is gripped or released by the reference vise jaw 43 and the pressing vise jaw 45. It is possible.

The guide column device 9 for guiding the cutting head 13 in the vertical direction is shown in FIGS. 1 to 3 and 4
As is clear from FIGS. 6 to 6, the main guide post 59 is provided in a cylindrical shape standing on the right sub-base 15R, and the sub-guide post 61 standing on the left sub-base 15L. Left and right columns 63R and 63L are erected at the rear positions of the main guide post 59 and the sub guide post 61 which are close to each other.

In order to make the guide column device 9 a rigid body, the lower part of the main guide post 59 and the lower part of the right pillar 63R, the lower part of the sub guide post 61 and the lower part of the left pillar 63L are shown in FIG.
As shown in FIG. 6, left and right lower connecting members, respectively.
65R and 65L are integrally connected, and the upper parts are integrally connected by left and right upper connecting members 67R and 67L (see FIGS. 1 and 3). Further, the left and right upper connecting members 67R, 67L are integrally connected via an intermediate connecting member 69 extending in the left-right direction as shown in FIG.

As is clear from the above configuration, in the guide column device 9, the main guide post 59 and the sub guide post
61 is in a mode in which it is reinforced by the columns 63R and 63L, and is in a mode in which they are mutually reinforced. Therefore, with respect to the main guide post 59 and the sub guide post 61, it is attempted to bend the main guide post 59 and the sub guide post 61 in the front and rear direction due to an eccentric load caused by the cutting head 13 moving in the front and rear direction. Even if a large moment is applied, the main guide post 59 and the sub guide post 61 are not bent, and the vertical movement of the cutting head 13 can be maintained smoothly.

Also, the upper part of the main guide post 59 and the sub guide post
Since the upper part of 61 is connected via the intermediate connecting member 69, the bending in the left-right direction is mutually regulated,
It is possible to prevent lateral bending.

That is, the guide column device 9 includes the main guide post 59.
Also, the sub guide post 61 is prevented from bending in the front-rear direction and the left-right direction, and the vertical movement of the cutting head 13 can be smoothly and accurately guided.

Referring to FIG. 1 and FIG. 2, the cutting head 13 supporting the band saw blade 11 is guided by the main guide post 59 and the sub guide post 61 to move up and down, and a lifting housing 71 and a lifting housing 71 are provided. The saw blade housing 73 is movably supported in the front-rear direction.

More specifically, as apparent from FIGS. 4 and 6, the elevating housing 71 has leg portions 75, 77 on both left and right sides.
And the upper portions of both foot portions 75 are integrally connected by a beam member 79. The right leg portion 75 is vertically movably fitted to the main guide post 59.
The left leg portion 77 is located slightly to the right of the left end portion of the beam member 79. A roller bracket 83 is attached to the left end of each of the guide bracket 81 and the beam member 79 attached to the lower portion of the leg portion 77.
A guide roller 87, which holds an elevating guide rail 85 vertically attached to the inner surface of the sub guide post 61 from the front-rear direction, is rotatably mounted on the 83. Further, a vertical position detector 89 such as a rotary encoder is attached to the beam member 79, and the pinion attached to the rotary shaft of the vertical position detector 89 is attached to the sub guide post 61 in parallel with the lifting guide rail 85. It is meshed with the attached rack rod 91.

With the above configuration, the elevating housing 71 is vertically moved by being guided by the main guide post 59 and the sub guide post 61,
It will be understood that the vertical movement speed and the vertical movement position of the lifting housing 71 can be detected by the vertical position detector 89.

In order to move the lifting housing 71 up and down, as shown in FIGS. 4 and 6, a main guide post 59 is provided.
A lifting cylinder 93 is placed at a position close to
A balance cylinder (sub-elevating cylinder) 95 is arranged at a position close to the sub-guide post 61. A base portion of the lifting cylinder 93 is attached to the sub-base 15R, and a tip end portion of a vertically movable piston rod is connected to a bracket 97 attached to the beam member 79. The balance cylinder 95 is for supporting an eccentric load on one side of the elevating housing 71 to ensure a smooth vertical movement between the main guide post 59 and one leg portion 75. Is attached to the sub-base 15L, and the tip end portion of the piston rod is vertically movably attached to the beam member 79 and connected to the bracket 99. It should be noted that the diameter of the vertical movement balance cylinder 95 is configured to be smaller than the diameter of the lifting cylinder 93, and, as will be described later, the internal pressure is maintained substantially constant by the configuration of the hydraulic circuit so as to always deal with an unbalanced load. Has been done.

As can be understood from the above configuration, the lifting housing 71 is moved up and down by the operation of the lifting cylinder 93. When the up-and-down housing 71 is moved up and down, an unbalanced load on the side where the up-and-down housing 71 is separated from the main guide post 59 is supported by the balance cylinder 95.
A galling phenomenon or the like does not occur between the main guide post 95 and the one leg portion 75, and smooth vertical movement is always ensured.

As described above, after the elevator housing 71 is appropriately moved up and down by the elevator cylinder 93, the elevator housing fixing device 10 is provided to fix the elevator housing 71 at an arbitrary height position.
1 (see FIG. 3 and FIG. 6) is provided. This elevating housing fixing device 101 prevents the elevating housing 71 from descending to ensure safety. For example, the main guide post
The brake shoe is strongly pressed against at least one or both of 59 and the sub guide post 61 by an elastic body such as a disc spring, and the brake shoe and the main guide post 59.
Alternatively, it is also possible to adopt a configuration in which the lifting housing 71 is prevented from descending due to friction with the sub guide post 61.

However, in this embodiment, the lifting housing fixing device 101 is arranged between the main guide post 59 and the support 63R, as shown in FIGS. 3 and 6, and is shown in FIG. It is configured to

That is, as is clear from FIG. 7, the clevis bracket 103 is attached to the lower part of the upper connecting member 67R connecting the upper part of the main guide post 59 and the upper part of the column 63R with a plurality of bolts (not shown). is there. On this clevis bracket 103, a plurality of support members 107 such as a strip of steel are vertically provided by a fixture 105 composed of bolts and nuts, and each support member 107 is held at appropriate intervals by a plurality of ring-shaped spacers 109. ing. The lower end of each of the support members 107 is connected to a bracket 113 having a U-shaped cross section through a ring-shaped spacer 109, a pipe-shaped elastic body 111 such as urethane rubber, and a fixture 105 composed of bolts and nuts. The bracket 113 is connected to the lower connecting member 65R via a suitable number of bolts 115.

In order to fix the elevating housing 71 to the supporting member 107, a bracket 115 facing the supporting member 107 is attached to a part of the elevating housing 71. This bracket 115
A plurality of bolts (not shown) are attached to the base block 117 so as to face the support member 107, and the base block 117 has a pair of support leg members facing each other in the width direction of the support member 107. 119 is attached integrally. An elevator lock cylinder 121 facing the support member 107 is attached to the pair of support members 119.

A pressure block 125 facing the support member 107 is appropriately attached to a tip end portion of a piston rod 123 that is reciprocally provided in the lifting lock cylinder 121. A friction member 127 such as a brake shoe is interposed between the pressing block 125 and the support member 107, between the support members 107, and between the support member 107 and the base block 117. The friction members 127 are the pair of support leg members 1
It is slidably supported in a support groove 119G formed in 19, and its vertical movement along the support member 107 is restricted.

In the above-mentioned configuration, when the elevating lock cylinder 121 is operated and the friction member 127 is strongly pressed by the pressing block 125, the friction members 127 and the support members 107 abut each other so as to sandwich each other, and the friction force is increased. As a result, it becomes impossible to move the support member 107 up and down. Therefore, the support member 10
The elevating housing 71 can be fixedly supported with respect to the 7, and safety can be ensured even when the elevating cylinder 93 fails, for example.

Referring again to FIGS. 4, 5, and 6, in order to movably support the saw blade housing 73 in the front-rear direction with respect to the elevating housing 71, the right leg portion of the elevating housing 71 is supported. Guide brackets 131 having guide members 129 are attached to the upper and lower portions of the side surface of 75, respectively. Similarly, a guide member 133 is attached to the upper surface of the guide bracket 81 attached to the lower side surface of the left leg portion 77, and an upper guide bracket including the guide member 133 is provided above the guide bracket 81. 135
Are provided facing each other.

Between the guide members 129 provided on the right leg portion 75 and between the guide members 133 on the left leg portion 77, left and right protrusions provided on the back surface of the saw blade housing 73 in a rearward direction. Front and rear slide members 135R and 135L are arranged.
Guided members 137 and 139 guided by the guide members 129 and 133 are provided on the upper and lower surfaces of the left and right front and rear slide members 135R and 135L, respectively.

The left and right guide cylinders 131R and 141L are attached to the lower guide bracket 131 of the right leg 75 and the lower part of the left leg 77, respectively, and the cylinders 141R and 141L can be freely moved back and forth. Equipped with piston rod 1
The tips of 43R and 143L are appropriately connected to the back surface of the saw blade housing 73. The left and right front and rear cylinders 141R and 141L are fluid pressure cylinders having the same structure, and are configured to operate in synchronization with each other, as will be described later. In order to detect the forward / backward movement position and the forward / backward movement speed of the saw blade housing 73, a rack rod 145 in the front-rear direction is attached to the right front slide member 135R, and this rack rod 145 is attached to the guide bracket 131. The pinion gear attached to the rotary shaft of the front-back position detector 147 such as the rotary encoder is meshed.

With the vertical configuration, the saw blade housing 73 is moved back and forth with respect to the lifting housing 71 by appropriately operating the left and right cylinders 141R and 141L for forward and backward movement, and the forward and backward movement speed and the forward and backward movement position are determined by the forward and backward position detector 147. It will be appreciated that it can be detected.

The saw blade housing 73 moves back and forth in the left and right cylinders.
Since it is performed by the synchronous operation of 141R and 141L, there is no delay on the left and right sides of the saw blade housing 73, the horizontal movement is smooth, and when the workpiece W is cut in the horizontal direction, Accurate horizontal cutting can be performed without causing insufficient cutting on one side.

As described above, the saw blade housing 73, which is moved back and forth with respect to the elevating housing 71, includes the left and right wheel housings 151R and 151L on both left and right sides of the beam member 149 extending in the left and right direction, as shown in FIG. It will be. As can be understood from FIG. 2, the left and right wheel housings 151R and 151L are formed in a hollow box shape, and the front and rear slide members are attached to the rear wall plates 153 of the respective wheel housings 151R and 151L.
The 135R and 135L are appropriately integrally attached, and the tip end portions of the piston rods 143R and 143L of the front and rear movement cylinders 141R and 141L are appropriately connected.

One of the wheel housings 151R has a drive wheel 15 having a diameter large enough to cut a large workpiece W.
5 and a large diameter driven gear 157 are rotatably mounted via a shaft 159. The driven gear 157 includes a drive motor 161, which is attached to the back of one wheel housing 151 (second
Drive gear 1 driven by a reducer 163 (see the figure)
65 meshed.

In the other wheel housing 151L, small-diameter driven wheels 167 and 169 are rotatably mounted via shafts 171 and 173 that are vertically separated from each other. Of the above shafts 171,173, the lower shaft 1
73 is supported by the rear wall plate of the wheel housing 151L, and the upper shaft 171 is supported by a slide block 175 that is movable in the left-right direction. Above slide block 1
The reference numeral 75 is slidably supported in the left-right direction on a left-right guide block 177 attached to the inside of the rear wall plate. In order to slide the slide block 175, the guide cylinder 177 has a tension cylinder 179.
Is mounted, and the tip end portion of the piston rod provided in the tension cylinder 179 so as to reciprocate in the left-right direction is connected to the slide block 175.

With the above configuration, after the endless band saw blade 11 is hung on the drive wheel 155 and the upper and lower driven wheels 167, 169, the upper driven wheel 167 is pulled leftward in FIG. 1 by the tension cylinder 179, An appropriate tension can be applied to the band saw blade 11.
It is desirable that the force of the tension cylinder 179 to pull the driven wheel 167 is always biased by an elastic body such as a disc spring.

As described above, in this embodiment, the driven wheels 167,
Since the 169 has a small diameter and is separated from each other, the length of the saw blade housing 73 in the left-right direction can be shortened, and the overall structure of the cutting head 13 can be reduced in size and weight. Further, the driven wheel 167 on the upper side is configured to be movable in the left-right direction, so that the band saw blade 11 can be detached and replaced relatively easily.

In order to easily attach and detach the band saw blade 11 to and from the drive wheel 155 and the driven wheels 167 and 169, side opening / closing lids are provided near the side portions of the left and right wheel housings 151R and 151L via hinge members (not shown). 181R and 181L are mounted so that they can be opened and closed in the left-right direction. Furthermore, on the upper and lower parts of the left and right wheel housings 151R and 151L,
Upper opening / closing lids 183R, 183L and lower opening / closing lids 185R, 185L that can be opened and closed in the vertical direction are attached.

Therefore, the side opening / closing lids 181R, 181L on the left and right wheel housings 151R, 151L and the upper and lower opening / closing lids 183R, 183L.
When L: 185R, 185L is opened, the side and upper and lower parts corresponding to the drive wheel 155 and the driven wheels 167, 169 are opened, so that the band saw blade can be easily attached to and detached from the drive wheel 155 and the driven wheels 167, 169. .

A band saw blade support device 187 is attached to the beam member 149 of the saw blade housing 73 so that the band saw blade 11 can be attached to and detached from the drive wheel 155 and the driven wheels 167 and 169 more easily.

More specifically, as apparent from FIGS. 1 and 2, support brackets 189R, 189L are attached to the front surface of the beam member 149 at appropriate intervals in the left-right direction. 189L includes saw blade lifting cylinders 191R and 191L
Is rotatably supported in the front-rear direction via pins 193R and 193L. At the lower end of the piston rods 195R, 195L, which are vertically movable in the saw blade lifting cylinders 191R, 191L, a band saw blade support member having an L-shaped cross section extending in the left-right direction.
197 are supported. This band saw blade support member 197 supports the upper part of the endless band saw blade 11 between the drive wheel 155 and the driven wheels 167 and 169, and the band saw blade 11 is provided at an appropriate position of the saw blade support member 197. A regulating plate 199 is attached to prevent the upward disengagement.

With the above configuration, the band saw blade 11 is supported on the saw blade support member 197 while the upper side of the band saw blade 11 is supported.
The lower side of 11 is held in a state of being hooked on the drive wheel 155 and the driven wheel 169. Then, the saw blade lifting cylinder 19
1R and 191L are operated in synchronization, and the saw blade support member 197 is lifted to a position corresponding to the upper side of the drive wheel 155 and the driven wheel 167. Then, by swinging the saw blade supporting member 197 in the rearward direction close to the drive wheel 155 and the driven wheel 167, the upper side of the band saw blade 11 can be hung on the drive wheel 155 and the driven wheel 167. By performing the operation opposite to the above, the band saw blade
11 can be removed.

Therefore, even if the band saw blade 11 is large and heavy, the band saw blade 11 can be easily hooked and removed from the drive wheel 155 and the driven wheels 167 and 169.

In order to guide and support the band saw blade 11 on both sides of the portion where the band saw blade 11 cuts the workpiece W, saw blade guide devices 201R and 201L are attached to the left and right wheel housings 151R and 151L, respectively. . The left saw blade guide device 201L is rotatably supported on the lower part of the left wheel housing 151L so as to correspond to the cutting width of the workpiece W. The right saw blade guide device 201R is mounted at a fixed position under the right wheel housing 151R, and the right saw blade guide device 201R includes a band saw blade 11R.
A rotating brush 203 that removes the chips adhering to is rotatably supported. The rotary brush 203 is rotated by receiving power from the power system of the drive wheel 155, but since it has a general configuration, the detailed description of the rotary brush 203 will be omitted.

Referring to FIG. 8, FIG. 9 and FIG. 10, the saw blade guide device 201L on the left side is positionally adjustable in the left-right direction by a support portion (not shown) provided at the bottom of the wheel housing 151L on the left side. An arm portion 205 that can be appropriately fixed is provided, and a box-shaped guide housing 207 is provided at a tip end portion of the arm portion 205. The guide housing 207 is an arm member 205.
Is provided with a fixing plate 209 fixed to the front end portion of the plate through a plurality of bolts, and left and right side plates 211R and 211L are attached to the fixing plate 209 so as to be separated from each other in the left-right direction, and both side plates 211R and 21R
It is configured to include an upper plate 213 attached to the upper part of 1L.

One of the above side plates 211R and 211L, one side plate 211R
An arcuate opening 215 is formed in the lower part of the, and a concentric arcuate guide groove 217 is formed in the inner surface. Further, an arcuate opening 219 is also formed in the lower part of the other side plate 211L.
(See FIG. 8) is formed, and an arc-shaped guide member 223 having an arc-shaped guide groove 221 formed inside is integrally attached to the opening 219. The arc-shaped engaging portions 227, 22 of the rotating body 225 are provided in the guide grooves 217, 221, respectively.
9 is rotatably engaged.

The rotating body 225 is for guiding and supporting the band saw blade 11, and a groove 231 through which the band saw blade 11 can pass is formed near the center of rotation of the rotating body 225. Guide blocks 233, 235 that sandwich and guide the band saw blade 11 from both sides are mounted opposite to each other. One guide block 233 is pressed toward the other guide block 235 by the action of the mini cylinder 237 attached to the rotating body 225. Being energized. Also,
A back support block 239 for guiding and supporting the back of the band saw blade 11 is mounted in the groove 231 via a pin 241.
Further, in the groove 231, a pair of gripping rollers 243 and 245 for pressing the band saw blade 11 from both sides are provided. The one holding roller 245 is rotatably supported by a swing bracket 249 provided swingably through a pin 247,
The swing bracket 249 is pressed and biased toward the other holding roller 243 side by a mini cylinder 251 provided on the rotating body 25.

As is clear from the above configuration, the band saw blade 11 is provided with the rotating body 225.
The holding rollers 243, 245 and the guide block 2 prepared for
Both sides are held and guided by 33, 235, and the back side is guided and supported by a back support block 239.

In order to automatically rotate the rotating body 225 so that the tip of the tooth on the band saw blade 11 is directed vertically downward and horizontally, the rotating cylinder 2 is used.
53 are provided. The base of the rotating cylinder 253 is pivotally supported by a bracket 255 attached to the upper plate 213, and the tip of a reciprocally movable piston rod 257 has a pin 2
It is pivotally connected to an appropriate position of the rotating body 225 via 59.

Therefore, by appropriately operating the rotating cylinder 253, the rotating body 225 can be appropriately rotated.

In order to regulate the rotating position of the rotating body 225, the rotating body 225
A stopper pin 261 is attached to the protruding portion of the guide housing 207, and a bracket is attached to each of the fixed plate 209 and the side plate 211 of the guide housing 207. A stopper bolt 263, to which the stopper pin 261 can abut, is attached to each bracket.
Is screwed to adjust the position.

In order to fix the rotating body 225 after rotating the rotating body 225, a lock cylinder 265 is attached to an appropriate number of the guide member 223, and a piston provided on the lock cylinder 265 so as to reciprocate. In the 267, the engaging portion 229 of the rotating body 225 and the guide member 223 can be freely clamped.
9 is integrally attached via a bolt 271. Between the pressing piece 269 and the lock cylinder 265, an elastic body 273 such as a coil spring for releasing the fixing is elastically mounted.

As can be understood from the above structure, the rotating body 225 is rotated by appropriately operating the rotating cylinder 253, and the band saw blade 11 supported and guided by the rotating body 225 has the tooth tip vertical. Switching is performed between a state in which the tooth tips are oriented in the downward direction and a state in which the tooth tips are oriented in the horizontal direction. Then, by operating the lock cylinder 265, the rotating body 225 is fixed in the switched state.

Incidentally, the saw blade guide device 201R on the right side has the same configuration as the saw blade guide device 201L on the left side, and therefore detailed description of the configuration is omitted.

As can be understood from the above description, the work piece W placed on the work table 3 has the vice device 7.
In the state where the workpiece W is gripped and fixed by holding the tooth tips of the band saw blade 11 downward, the cutting head 13 is lowered to vertically cut the workpiece W. Further, the rotating body 225 is rotated by the operation of the rotating cylinder 253 to hold the tooth tips of the band saw blade 11 horizontally in the forward direction, and the band saw blade 11 corresponds to the rear end of the workpiece W. To the appropriate height so that the lift lock cylinder 121
To fix the vertical movement of the cutting head 13. After that, by operating the front and rear movement cylinders 141R and 141L to move the saw blade housing 73 in the forward direction, the workpiece W can be cut horizontally. That is, horizontal cutting and vertical cutting can be performed on the work piece W, and the test piece and the like can be cut and separated from the work piece W.

By the way, when the workpiece W is cut in the horizontal direction as described above, the support slider 39 in the vise device 7 is used.
By moving R and 39L in the forward direction in advance, the saw blade housing 73 and the vise device 7 do not interfere with each other.

When the workpiece W is cut in the horizontal direction,
Instead of moving the saw blade housing 73 horizontally, it is also possible to move the work table 3 relatively horizontally so that the workpiece W is relatively cut into the band saw blade 11.

Referring to FIG. 11, in FIG. 11, the lifting cylinder 93,
Control circuit of balance cylinder 95 and cylinder for longitudinal movement
The control circuit of 141R, 141 is illustrated.

The hydraulic pump P rotationally driven by the motor M and the ascending / descending cylinder 93 are connected via a first oil passage 277 in which a first solenoid valve 275 at four ports and three positions equipped with solenoids SOL1 and SOL2 is arranged midway. I am doing it. This first oil passage 2
In 77, a pilot operated check valve 279 is arranged between the first solenoid valve 275 and the lifting cylinder 93.

The hydraulic pump P and the balance cylinder 95 are connected to the second oil passage 28.
A balancing valve 283 is disposed in the middle of the second oil passage 281. Balancing valve 283 above
Normally, the second oil passage 281 is connected, but when the pressure in the balance cylinder 95 rises above a predetermined pressure that has been adjusted and set, the balance cylinder 95 is connected to the tank T. Is. That is, the balancing valve 283 has a function of always maintaining the pressure in the balance cylinder 95 substantially constant.

In order to control the descending speed (cutting speed) of the cutting head 13 that is vertically moved by the lifting cylinder 93,
A cut control circuit is connected to the first oil passage 277.

More specifically, the third passage 285 branches from between the pilot operated check valve 279 and the lifting cylinder 93 in the first oil passage 277. The third oil passage 285 includes a filter 287 and a third oil passage 285 from the branch point side of the first oil passage 277.
A second solenoid valve 289 for disconnecting the connection of 285, a flow control valve 291 with adjustable throttle, and an automatic flow control valve 293 are sequentially arranged.

The automatic flow control valve 293 is provided with a balance spring 297 on one side of a spool 295 slidably mounted therein and a pressure chamber 299 on the other side. This automatic flow control valve 2
93, the spool 295 is moved by the balance between the balance spring 297 and the pressure in the pressure chamber 299, and the opening degree of the communication state between the third oil passage 285 and the tank T is set according to the moving position of the spool 295. The aperture is adjusted appropriately.

A fourth oil passage 301 connected to the hydraulic pump P is connected to the pressure chamber 299 of the automatic flow control valve 293. This 4th
The oil passage 301 has a filter 303, an orifice 305, and a hydraulic pump P.
They are arranged sequentially from the side. A branch oil passage 307 is branched and connected between the orifice 305 of the fourth oil passage 301 and the automatic flow control valve 293, and the branch oil passage 307 has the branch saw blade 11 connected thereto.
A relief valve 309 that controls the discharge of the pressure oil according to the detected value of the back force applied to the engine is provided.

With the above configuration, when the solenoid SOL1 of the first solenoid valve 275 is excited, pressure oil is supplied to the lifting cylinder 93 via the first oil passage 277, and the cutting head 13 is lifted. At the same time, the balance cylinder 95 is also supplied with pressure oil via the second oil passage 281. As described above, the lifting cylinder 93 and the balance cylinder 95.
When pressure oil is supplied to the cutting head 13 and the cutting head 13 is lifted, the limit switch LS1 provided in the guide column device 9 is operated at the most raised position of the cutting head 13. By operating this limit switch LS1, the solenoid SOL1 of the first solenoid valve 275 is demagnetized,
The first solenoid valve 275 is in the neutral position, and the lifting of the cutting head 13 is stopped.

Next, when the solenoid SOL2 of the first solenoid valve 275 is excited, the pressure oil in the lifting cylinder 93 is discharged by the weight of the cutting head 13, and the cutting head 13 descends by its own weight. When the cutting head 13 is lowered as described above, the weight of the cutting head 13 acts on the pressure oil in the balance cylinder 95 to increase the pressure, so that the balancing valve 283 is connected to the tank T and the balance cylinder 283 is connected. The pressure oil in 95 is discharged to the tank T.

As mentioned above, the cutting head 13 is lowered,
When the cutting head 13 is lowered to a predetermined position, the limit switch LS2 is activated and the first solenoid valve 275
Solenoid SOL2 is demagnetized and the first solenoid valve 27
5 is the neutral position.

By the operation of the limit switch LS2, the solenoid SOL3 of the second solenoid valve 289 is excited, and the second solenoid valve 289 is switched. Therefore, the pressure oil in the lifting cylinder 93 is discharged to the tank T via the third oil passage 285. Therefore, the discharge amount of the pressure oil from the lifting cylinder 93 is controlled by the flow control valve 291 and the automatic flow control valve 293,
The descending speed of the cutting head 13, that is, the cutting speed of the band saw blade 11 with respect to the workpiece W is controlled.

As described above, when the cutting speed of the band saw blade 11 with respect to the workpiece W is controlled by lowering the cutting head 13, the cutting speed increases or the band saw blade 11 increases.
When the back force exerted on the band saw blade 11 increases due to wear of 11, the relief valve 309 tends to close, and the pressure in the pressure chamber 299 of the automatic flow control valve 293 increases. When the pressure in the pressure chamber 299 rises, the spool 295 slides against the balance spring 297, and the automatic flow control valve 293 moves to the third oil passage.
The communication status of 285 will be gradually narrowed down. Therefore,
The descending speed of the cutting head 13 is gradually reduced, and the breakage of the band saw blade 11 and the bending of the band saw blade 11 are prevented.

When the back force related to the band saw blade 11 becomes small, the spool 295 of the automatic flow control valve 293 is pressed and slid by the action of the balance spring 297, so that the communication state of the third oil passage 285 is normally opened. Therefore, the descending speed of the cutting head 13 becomes the speed controlled by the flow control valve 291.

Referring again to FIG. 11, in order to synchronously operate each of the front-rear movement cylinders 141R, 141L for operating the saw blade housing 73 in the cutting head 13 in the front-rear direction, each front-rear cylinder 141R, 141L 1 Pressure chambers 311R and 311L are
No. 5 in each pressure supply chamber 315R, 315L of the master cylinder 313
It is connected via oil passages 317R and 317L.

More specifically, in the master cylinder 313, the partition 319 provided in the central portion divides the interior of the master cylinder 313 into two divided chambers, and each of the divided chambers has a piston 321.
R, 321L is provided. Each piston 321R, 321L
Are integrally attached to a common piston rod 323 that slidably penetrates through the master cylinder 313. Therefore, each of the pressure supply chambers 315R and 315L in the master cylinder 313 is
Is always held in the same capacity.

Second pressure chamber 325R, 32 of each of the above-mentioned forward / backward movement cylinders 141R, 141L
The 5L and the hydraulic pump P are connected via a sixth oil passage 327, and a third solenoid valve 329 at four ports and three positions is arranged in this fifth oil passage 327. The third solenoid valve 329 and the master cylinder 313 are connected via a seventh oil passage 331. A pilot operated check valve 33 is provided between the front and rear cylinders 141R and 141L and the third solenoid valve 329 and in the seventh oil passage 331.
There are 3,335. A pressure reducing valve 337 is provided between the pump P and the third solenoid valve 329, and a solenoid baffle valve SV having a solenoid SOL10 is provided next to the pilot operated check valve 333.

Further referring to FIG. 11, the pump P and the fifth oil passage 31
7R and 317L are connected to each other via the eighth oil passage 339. More specifically, a filter 341, an orifice 343 and a pressure reducing valve 345 are sequentially arranged in the eighth oil passage from the pump P side. The pressure reducing valve 345 has branch oil passages 347R and 347L connected to the fifth oil passages 317R and 317L, respectively.
A solenoid valve 349 and a fifth solenoid valve 351 are provided respectively.

A branch oil passage 353, which is branched and connected to the eighth oil passage 339 between the orifice 343 and the pressure reducing valve 345, is connected between the pilot operated check valve 333 and each of the longitudinal cylinders 141R and 141L. Yes, this branch oil passage 353
A sixth solenoid valve 355, which can freely cut off communication, is disposed in this. Furthermore, between the pilot operated check valve 333 and the cylinders 141R and 141L for forward and backward movements, and the second solenoid valve 289 in the third oil passage 285.
And the flow control valve 291 are connected via a ninth oil passage 357. The ninth oil passage 357 is provided with a filter 359 and a seventh solenoid valve 361 capable of freely blocking communication.

In the above-mentioned configuration, the third solenoid valve 329
When the solenoid SOL6 is excited, the pressure oil from the hydraulic pump P is supplied to the master cylinder 313, and the piston rod 323 is moved rightward in FIG. Therefore, the pressure oil in each pressure supply chamber 315R, 315L in the master cylinder 313 is transferred to each front-rear movement cylinder 141R, 141L.
Will be supplied into the first pressure chambers 311R and 311L. Therefore, the cylinders 141R and 141L for forward and backward movement are operated in synchronization,
The saw blade housing 73 of the cutting head 13 will be advanced.

When the saw blade housing 73 is advanced as described above, the tip of the band saw blade 11 is directed horizontally forward as described above, and the workpiece W is cut by making a cut in the workpiece W. It is what is cut.

As described above, when the saw blade housing 73 is advanced and the limit switch LS3 is operated at an appropriate position, the solenoid valve SV is switched to the cutoff state, and the solenoid SOL4 of the seventh solenoid valve 361 is excited and switched to the communication state. Therefore, the cutting speed of the band saw blade 11 with respect to the workpiece W is the same as that in the vertical cutting, and the flow control valve 291.
And it will be controlled by the automatic flow control valve 293.

As described above, the forward movement of the saw blade housing 73 performs horizontal cutting of the workpiece W, and when the saw blade housing 73 advances to a predetermined position, the limit switch LS4 is activated. By operating this limit switch LS4,
The solenoid valve 361 is switched to the cutoff state, the solenoid SOL5 of the third solenoid 329 is excited, and the solenoid valve SV is switched to the communication state again. Therefore, the pressure oil of the hydraulic pump P is transferred to the cylinders 141R,
By being supplied to the second pressure chambers 325R and 325L of 41L, the saw blade housing 73 is returned to the original retracted position. When the saw blade housing 73 is retracted and returned, a limit switch (not shown) is activated and the third solenoid valve 329 is returned to the neutral position.

In the above configuration, the solenoids of the fourth solenoid valve 349 and the fifth solenoid valve 351 are excited to bring them into communication with each other, whereby the pressure oil on the side of the first pressure chambers 311R, 311L of the cylinders 141R, 141L for forward / backward movement is increased. Can be replenished. Also, the sixth solenoid valve 355
The second pressure chamber 325R, 32 of each cylinder 141R, 141L for forward and backward movement is excited by switching the solenoid to the communication state.
It is possible to apply pressure to 5L and hold the saw blade housing 73 in the retracted position in the locked state.

As can be understood from the above description, the tooth tips of the band saw blade 11 are horizontally oriented in the forward direction so that the band saw blade housing 73
The workpiece W can be cut horizontally by advancing the. In this case, the elevating housing fixing device 101 can fix and hold the elevating housing 71 at a predetermined height position, and the saw blade housing 73 can be horizontally held while detecting the back force of the band saw blade 11 without causing left and right delays. Since the cutting in the direction can be controlled, horizontal cutting can be performed safely and accurately.

Referring again to FIG. 2, at a position below the position where the band saw blade 11 cuts the workpiece W, a chip conveyor 363 is provided in order to discharge the chips generated during cutting and dropped on the base to the outside. Is provided. This chip conveyor 363
Is a screw conveyor, and its configuration is general, so a detailed description of the configuration of the chip conveyor 363 will be omitted.

[Effects of the Invention] As can be understood from the above description of the embodiments, since the gist of the present invention is as described in the scope of claims, the cutting head according to the present invention can have any height. It can be securely fixed in position and improves the safety when cutting the workpiece horizontally. Further, even when an abnormality occurs in the control circuit of the lifting cylinder, the cutting head can be prevented from dropping suddenly and safety can be ensured.

[Brief description of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of a cutting device according to the present invention. FIG. 2 is a right side view of the above. FIG. 3 is a plan view of the above. FIG. 4 is a sectional view taken along the line IV-IV in FIG.
Parts are omitted and only main parts are shown. FIG. 5 is a right side view of FIG. 4 seen from the right side. FIG. 6 is a plan view of FIG. 4 seen from above. FIG. 7 is an enlarged cross-sectional view taken along the line VII-VII in FIG. 3, showing a part in a partial cross section and omitting a part to show the main part. FIG. 8 is an enlarged sectional view taken along the line VIII-VIII in FIG. 1, showing only the main part. FIG. 9 is a sectional view taken along the line IX-IX in FIG. FIG. 10 is a bottom view of FIG. 9 seen from below, showing a partial cross section. FIG. 11 is a hydraulic circuit diagram showing only the main part in order to explain the operation of the main part. 3 ... Work table, 11 ... Band saw blade 13 ... Cutting head, 5 ... Base 59 ... Main guide post, 107 ... Support member 127 ... Friction member 101 ... Lift housing fixing device

Claims (2)

[Claims] 1. A cutting head, which supports a band saw blade for cutting a material placed on a work table, is vertically movably supported by a main guide post erected on the base. A cutting device, characterized in that the cutting head is provided with a brake device for pressing a friction member against a cutting head supporting member provided in parallel with the main guide post or the main guide post. 2. The cutting head support member is made of a plurality of steel strips provided in parallel with the main guide post, and friction members are arranged on both sides of each steel strip so as to compress the respective steel strips. The cutting device according to claim 1.