JPS5915770B2 - Workpiece cutting method and horizontal bandsaw machine used for that method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of cutting a workpiece, particularly a cutting method using a horizontal band saw, and a horizontal band saw used in the method.

In general, a horizontal bandsaw machine has a box-shaped base with a saw blade or uzing attached to it so that it can move up and down.
- An endless bandsaw blade is wound around a drive wheel and a driven wheel that are rotatably supported by a housing.

The saw blade and housing are generally inclined appropriately with respect to the horizontal, and the driving wheel and the driven wheel are supported in an inclined state.

Therefore, the band saw blade, which is wound around the drive wheel and the driven wheel, has a section where the workpiece is cut.
It is twisted vertically by a saw blade guide member attached to the housing.

In the conventional horizontal bandsaw machine as described above, if the angle of inclination of the saw blade and uzing is made thick ((nearly vertical), the difference in height between the top and bottom parts of both wheels becomes large. Therefore, it is possible to cut a workpiece with a large height, but the twisting angle (twist rate) of the band saw blade is not large, which poses a problem in terms of the life of the band saw blade.

Therefore, considering the lifespan of the bandsaw blade, it is recommended to reduce the twisting angle of the bandsaw blade (saw blade).If the inclination angle of the saw blade is made small (close to horizontal), it will be difficult to cut large workpieces. .

Therefore, when trying to cut a workpiece with a large height by keeping the twisting angle of the accumulator blade small, the diameters of both the drive and driven wheels must be increased, and the saw blade・There is a problem that the size becomes thicker and the overall structure becomes larger.

This invention was invented in view of the above-mentioned conventional problems, and its first purpose is to make the twisting angle of the band saw blade adjustable according to the height of the workpiece. This prevents the blade from being twisted more than necessary and extends the life of the band saw blade.

The second purpose is a relatively small drive. To provide a band saw machine capable of cutting a relatively large workpiece regardless of a driven wheel.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

In the following description, "left and right" refers to a direction corresponding to the left and right direction in FIG. 1, "front and back" refers to a direction corresponding to the left and right direction in FIG. 2, and furthermore, "
The term "up and down" refers to a direction corresponding to the up and down direction in FIGS. 1 and 2.

FIG. 1 is a front view schematically showing a horizontal bandsaw machine according to the present invention, and FIG. 2 is a side view thereof.

A vice device 3 capable of holding a workpiece W is attached to the upper surface of a base 1 of the horizontal bandsaw machine.

This vice device 3 consists of a fixed vice jaw 3a fixed at a fixed position on the base 1 and a movable vice jaw 3b that is movable in the left and right direction.
b is slidable in the left-right direction by a vice cylinder (not shown) attached to the base 1.

Note that this vice device 3 has the same configuration as a general vice device and has the same effects, so a detailed explanation of the structure and operation of the vice device 3 will be omitted. .

A hinge bracket 5 is appropriately installed in the vicinity of one side of the upper surface of the base 1, and a frame 9 is attached to the hinge bracket 5 through a horizontal hinge pin I extending in the front-rear direction. It is pivoted for free movement.

The frame 9 has an inverted U-shape with leg parts 13a and 13b on both sides of a beam part 110 extending in a direction perpendicular to the longitudinal direction (front-back direction) of the workpiece W. The hinge pin 7 is located at an appropriate position of the portion 13a.
It is supported by

A lifting cylinder 15 such as an air cylinder or a hydraulic cylinder is interposed between an appropriate position of the frame 9 (in this embodiment, the other leg 13b) and the base 1.

Therefore, as the elevating cylinder 15 expands and contracts, the frame 9 rotates in the vertical direction about the hinge pin 1.

That is, it is movable up and down along a plane perpendicular to the direction intersecting the longitudinal direction of the workpiece W.

A saw blade housing 17 is disposed between the legs 13a and 13b of the frame 9, and the left and right front sides of the saw blade housing 17 connect to the legs of the frame 9 via shafts 19a and 19b. It is rotatably supported near the lower end of 13a and 13b.

The shafts 19a and 19b extend in a direction perpendicular to the hinge pin 7.

Therefore, the saw blade housing 17 is capable of tilting twice in a direction perpendicular to a perpendicular plane drawn by the locus of vertical movement of the frame 9.

The saw blade housing 17 is made of a substantially C-shaped plate that is open at the center of rotation by the shafts 19a and 19b, and has a drive wheel 21 with flanges on both sides.
and a driven wheel 23 are rotatably mounted.

The drive shaft 25 of the drive wheel 21 is connected to the saw blade housing 17
It is operatively connected to a rotational drive device 27 such as a motor mounted on the motor.

The driven shaft 29 of the driven wheel 23 is connected to the saw blade housing 17.
The saw blade tensioning device 31 is mounted on the saw blade tensioning device 31.

This saw blade tensioning device 31 tensions the band saw blade 33 that is wound around the driving wheel 21 and the driven wheel 23.
The loosening of the band saw blade 33 causes the drive wheel 21 and the band saw blade 3 to
This serves to prevent slippage between the holder and the holder 3.

Therefore, the saw blade tensioning device 31 always urges the driven wheel 23 in a direction away from the drive wheel 21 by a spring or a cylinder, although detailed illustration thereof is omitted.

Incidentally, since the saw blade tensioning device 31 can be a known saw blade tensioning device, a more detailed explanation of the saw blade tensioning device 31 will be omitted.

On the opposite side of the rotation center of the saw blade housing 170, that is, on the rear side, the drive wheel 21. Driven wheel 23
A roller bracket 35 extending toward the mounting surface side is integrally attached, and this roller bracket 35 forms a kind of contact body that can freely come into contact with the upper part (upper surface) of the workpiece W in advance of the band saw blade 33. However, the contact roller 37 is rotatably mounted.

On the front surface of the beam part 11 in the frame 9,
A guide plate 39 extending in the left-right direction is integrally attached, and a plurality of saw blade guide members 41a, 41b are attached to the guide plate 39 so as to be able to adjust their positions.

Saw blade guide member 41a. 41b is supported almost perpendicularly to the guide plate 39, and saw blade guide blocks 43a, 43 are provided at the lower end of each.
b is installed.

The saw blade guide block 43 a 543 b serves to vertically twist and guide the band saw blade 33 in order to cut the workpiece W, and the saw blade - C-shaped opening of the housing 17 The part is located.

Note that the saw blade guide block 43a. 43b is the band saw blade 33
The center of twisting is the axis 19a, 19
It almost coincides with the axis of b.

A stopper member 45 is attached to the frame 9 near the lower end of one leg 13a.

This stopper member 45 is connected to the shaft 19a. This is to restrict the rotation of the saw blade housing 17 about the saw blade housing 19b, and the contact surface that can freely come into contact with the saw blade housing 17 is provided with an elastic body 47 such as urethane that cushions the impact upon contact. Installation.

Note that when the saw blade/Using 17 comes into contact with the stopper member 45 when the frame 9 is in the lowest position, the Saw blade/Using 17 will move as shown in FIGS. 1 and 2. , is constructed so that it is in a nearly horizontal state.

In the horizontal bandsaw machine having the above configuration, even when the frame 9 is at the lowest position and the saw blade housing 17 is at the lowest position, the frame 9, the base 1, the saw blade, the housing 1, and the band saw blade are not connected to each other. 33 and the base 1 are constructed so as not to interfere with each other.

In the above configuration, after the lifting cylinder 15 is extended and the frame 9 is raised to the highest position,
A work W is appropriately fed between the fixed vice jaws 3a and the movable vice jaws 3b in the vice device 3, and is clamped and fixed by the fixed vice jaws 3a and the movable vice jaws 3b.

After fixing the work W, the rotary drive device 27 is driven to drive the band saw blade 33, and the elevating cylinder 15 is contracted to gradually lower the frame 9, thereby cutting the work W.

By the way, when cutting the workpiece W,
is relatively short as shown in FIG. 45 and held horizontally.

Therefore, in such a case, as shown in FIGS. 4 and 5, the driving wheel 21 and the driven wheel 23 are always in a horizontal state, and the band saw blade 33 is in a vertical state in advance.

Therefore, the band saw blade 33 is connected to the saw blade guide block 43a.
The band saw blade 33 cuts the workpiece W without being twisted at t 43 b, that is, with the twisting angle maintained at almost zero, compared to the case where the workpiece W is cut by twisting. As a result, the life of the band saw blade 33 is extended.

The workpiece W is relatively long, and by gradually lowering the frame 9, the saw blade and the contact roller 37 provided on the housing 17 come into contact with the upper part of the workpiece W as shown in FIG. This is because the twisting angle of the band saw blade 33 is maintained at almost zero until just before cutting into the workpiece W, and after the contact roller 37 comes into contact with the workpiece W, the contact roller 37 stops descending. As the frame 9 gradually lowers and the cutting of the workpiece W progresses, the saw blade and housing 17 move toward the shaft 19a.

The saw blade housing 1 automatically rotates around 19b.
The inclination angle of 7 is as shown in FIG. 7 (gradually increasing).

In other words, the saw blade/Using 17 automatically becomes gradually tilted from a horizontal position to cut the workpiece W.

In other words, the band saw blade 33 has a saw blade guide block 43a,
43b, the twisting angle of the band saw blade 33 automatically gradually increases as the band saw blade 33 cuts into the workpiece W.

Therefore, compared to the case where the band saw blade 33 is thickened in advance (twisted up and cut), the band saw blade 33 is gradually twisted up as necessary, so the life of the band saw blade is extended. .

As can be understood from the above description of the embodiments, the gist of the present invention is as described in the claims, so that the twisting angle of the band saw blade can always be maintained at the necessary minimum, and the band saw blade It is possible to extend the lifespan of

In addition, it is not necessary to set the inclination angle of the saw blade/uzing, and since the contact body contacts the upper part of the workpiece, the band saw blade does not interfere with the workpiece on the other side of the saw blade/uzing. It is something that never happens.

It should be noted that the present invention is not limited to the above-described embodiments, but can be implemented in other embodiments by making appropriate design changes.

For example, it can be easily implemented in a type of band saw machine in which the frame moves up and down along a vertical guide post.

[Brief explanation of drawings]

FIG. 1 is a front view schematically showing a saw machine according to the present invention;
Fig. 2 is a side view thereof, Fig. 3 is a bottom view of the welding part, and Figs. 4, 5, 6, and 7 are action explanatory diagrams schematically showing the cutting state of the workpiece, respectively. It is. Explanation of the symbols representing the main parts of the drawing, 1...
Base, 9... Frame, 17... Saw blade, 21... Drive wheel, 23
... Driven wheel, 33 ... Band saw blade,
41a, 41b...Saw blade guide members.

Claims (1)

[Claims] 1. By lowering the saw blade 17 holding the endless band saw blade 33 from the raised position, the work W
The work W is cut by cutting the band saw blade 33 into the workpiece W, and the twisting angle of the band saw blade 33 is maintained at approximately zero until just before the band saw blade 33 cuts into the work W. After the band saw blade 33 cuts into the workpiece W,
A cutting method in which the inclination angle of the saw blade 17 is increased in response to the lowering of the saw blade 17, and the twisting angle of the band saw blade 33 is gradually increased to cut the workpiece. 2. Uzing 1T is a saw blade, which is made up of a frame 9 that is attached to a base 1 that supports a workpiece W so as to be movable up and down, and a drive wheel 21 and a driven wheel 23 that are rotatably equipped with an endless band saw blade 33. One side of the band saw blade 33 is rotatably attached via shafts 19a and 19b parallel to the tension direction of the band saw blade 33, and the band saw blade 33 is twisted vertically and guided in the cutting area. Blade guide member 4
1a. 41b is attached to the frame 9, and the band saw blade 3
3. A horizontal bandsaw machine characterized in that a contact body capable of freely contacting the upper part of the workpiece W is attached to the other side of the saw blade or housing 17 in advance of the saw blade.