JPH035384Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a band saw machine, and more specifically, a valve that automatically controls the relative cutting speed of the band saw blade by detecting the back force applied to the band saw blade during cutting operations. The present invention relates to a bandsaw machine equipped with a device.

Originally, a horizontal band saw machine was made by welding a band-shaped saw blade made of thin elastic tool steel into an annular shape.The desired band saw blade was looped around multiple wheels in a band saw blade housing, and was circulated and driven by a drive device. Cutting involves sliding the band saw blade in the thickness direction before and after the cutting direction of the material to be cut, keeping the band saw blade vertical and guiding it, and at the same time lowering the entire band saw blade housing while keeping the band saw blade in a horizontal position to perform the cutting operation. It is a machine.

In this case, since the cutting work with a saw blade is cutting without lateral feed like a mold cutting machine, it is normal to consider the cutting force mechanically by dividing it into the principal component force and the back force component.
The main force of a band saw is controlled by a drive source such as an electric motor that drives the saw blade wheel, and the back force is often controlled by the downward pressure caused by the total weight of the saw blade housing pushing out the hydraulic fluid in the hydraulic cylinder.

However, when cutting a round bar with a band saw, it is necessary to hold the band saw blade in the thickness direction at a position wider than the diameter of the round bar in the cutting direction and at a distance, and slide the blade while pressing down on the saw back. First, since the cutting length of the material to be cut is naturally shorter than the diameter part at the beginning and just before the end of cutting, the thrust force is small and there is no fear of tooth spillage even with rapid descent, but when cutting near the diameter part. In this case, the thrust force becomes large, and unless the descending speed is reduced, there will be a tendency for tooth loss to occur.

In order to deal with the problems unique to conventional band saw machines mentioned above,
Devices have been considered that automatically detect changes in thrust force during cutting operations and automatically correct the downward pressure, but none have been completely satisfactory.

The present invention has been devised to solve the above-mentioned disadvantages of the conventional apparatus, and preferred embodiments thereof will be described in detail below with reference to the drawings.

The horizontal band saw machine 1 of the embodiment illustrated in FIG. 1 is a large horizontal band saw machine in which the distance between the main guide post 3 and the auxiliary guide post 5 is as long as 2 m, and the work piece to be cut, such as a round material with a diameter of 1 m, is used. This figure shows a large horizontal bandsaw machine that cuts material 7.

In this case, the band saw blade housing 11, which includes a saw blade wheel (not shown) that holds and circulates the band saw blade 9 and a drive device (not shown), may weigh more than 500 kg, and includes a single-acting hydraulic cylinder 13, etc. The band saw blade housing 11 is raised by sending pressure oil from the pump 15 to
It is gripped and fixed in the vises 19 and 21 on 7. Thereafter, while circulating the band saw blade 9, the solenoid valve 23 is switched to discharge the hydraulic oil in the hydraulic cylinder 13, and the band saw blade housing 11 is lowered to perform the cutting operation.

A fixed guide arm 25 is provided above the fixed vice 19, and above the movable vice 21, the movable guide arm 29 hangs down from the left and right connecting beam 27 of the band saw blade housing 11 so as to be able to adjust and fix the position freely. It is provided.

Band saw blade guide pieces 31 and 33 are provided at the lower ends of the fixed side guide arm 25 and the movable side guide arm 29 for sandwiching and slidingly guiding the band saw blade from both sides in the thickness direction. Saw back regulating guide pieces 35 and 37 are provided to press down on the blade.

As clearly shown in FIG. 2, the band saw blade 9 is clamped in the thickness direction at the lower end of the groove portion 39 or clevis portion provided in the lower end surface of the fixed guide arm 25, which is one of the guide arms, in the running direction of the band saw blade. A band saw blade guide piece 31 for guiding is attached with a pin 41, and a saw spine regulating guide piece 35 that spans the back of the band saw blade 9 is attached to the pin 45 through an elongated hole 43 in the vertical direction.
It is set up so that it can be moved freely while being guided by.

Furthermore, a pusher 47 is provided which penetrates through the ceiling of the groove 39 and has hemispherical upper and lower ends.The pusher 47 functions as a bell crank and can swing freely around a horizontal shaft 49 provided on a part of the fixed guide arm 25. A member 51 is provided.

A pressure reducing valve 5 is located near the upper end of the fixed side guide arm 5.
3 is provided, and a pilot pressure pipe 55 from the pump 15 described above is branched and led from a pipe connected to an introduction port 61 of a flow control valve 59, which will be described later, via a throttle valve 57 (see Fig. 1). reference).

Inside the pressure reducing valve 53, an introduction boat 63 branched from the pilot pressure piping 55 from the pump 15 and a discharge port 67 to the oil tank 65 are connected.
A conical head valve body 69 is provided in the communication hole connecting the shaft 71 of the conical head valve body 69 so as to be slidable in the axial direction of the communication hole and to open and close the communication hole to freely control the flow rate of the pressure oil.
In the air chamber 73 provided on the left side of the pressure reducing valve 53, the conical head valve body 69 is biased to the right in FIG.

A pusher rod 81 driven by a pusher bolt 79 provided at the upper end of the swinging member 51 is provided at the left end of the pressure reducing valve 53 and abuts against the spring seat 77 described above.

With the above configuration, when the swinging member 51 is pushed via the guide piece 35 in accordance with the movement of the band saw blade 9, the valve body 69 is moved via the bullet 75 in the direction of closing the communication hole.

The flow rate control valve 59 described above is constructed as shown in FIGS. 3, 4, and 5.

The flow control valve 59 is, for example, a surface plate 83 of the control device.
etc., and a dial 85 protrudes from the outside.

The pump 15 is inserted from the rear end in the axial direction of the spool 87.
Introductory port 6 for guiding pilot pressure piping 55 from
1 is provided, and the spool 87 is connected to the spring seat plate 9 of the balance spring 91 via the steel ball 89.
3 are facing each other.

A sliding spring seat block 95 is provided at the right end of the balance spring 91 to adjust the accumulated force of the balance spring 91.

The sliding spring seat block 95 has a male threaded portion 9 on the right end side.
7 is machined, and the inner thread 1 of the dial shaft tube 99
It is screwed together with 01.

Further, the male threaded portion 97 described above is provided with an elongated hole 103 as shown in FIG.
5 passes through the elongated hole 103 and engages with the elongated groove 109 of the first valve cover 107, and the dial shaft tube 9 described above
The flange portion 111 at the left end of the valve 9 is connected to the second valve lid 113.
It is prevented from falling out.

At least the outer one of the two-stage dials 85 is fixed to a dial shaft tube 99.

At the right end of the sliding spring seat block 95 mentioned above,
As is clear from FIG. 5, a stopper 115 that comes into contact with the detent pin 105 is provided whose position can be adjusted freely.

In addition, as shown in Figure 1, solenoid valve 2
3, the discharge oil from the fluid pressure cylinder 13 is led to the introduction port 119 of the flow control valve 59 via the variable flow rate setting valve 117, and the hydraulic oil controlled by the spool 87 passes through the discharge port 121 to the oil tank 65. It is flowing back.

Since the horizontal bandsaw machine 1 equipped with the embodiment device of the present invention has the above-described configuration, the material, hardness, maximum cutting length of the material to be cut 7, and
By simply setting the recommended saw speed based on the band saw blade's tooth pitch and rake angle, and at the same time matching the recommended thrust force strength to the scale on the dial 85, the most efficient cutting operation can be performed automatically.

That is, when cutting near the upper end of the workpiece 7, the thrust force is close to zero, so the conical head valve body 69 of the pressure reducing valve 53
However, the force of the swinging member 51 pushing it in the right direction in FIG.
Reflux to.

Therefore, the pressure of the hydraulic oil from the pump 15 guided to the introduction port 61 of the flow control valve 59 exhibits a value lower than the pressure set by the relief valve of the pump 15 or the like.

Therefore, the spool 87 of the flow rate control valve 59 moves to the left in FIG. 3 due to the stored force of the balance spring 91, and the oil discharged from the fluid pressure cylinder 13 flows from the introduction port 119 to the discharge port 121 with small resistance. The lowering speed of the band saw blade housing 11 is fast because the oil reaches the oil tank 65 and flows back to the oil tank 65.

Next, when cutting the diameter portion of the workpiece 7, the cutting length is long, so the thrust force becomes large, and the saw spine regulating guide piece 35 rises within the range allowed by the elongated hole 43, causing the pusher 47 to move upward. Pushing up, the swinging member 51 swings around the horizontal axis 49, and the pusher bolt 79 moves the pusher rod 81 to the right in FIG.

Therefore, the conical head valve body 69 of the pressure reducing valve 53 narrows the pilot pressure oil passage from the introduction port 63 to the discharge port 67, and the pressure from the pump 15 of the flow control valve 59 to the pilot pressure introduction port 61 is reduced to the same level as the pump 1.
The pressure will be close to the constant pressure set at 5.

Therefore, the spool 87 of the flow control valve 59 shown in FIG.
moves to the right, overcoming the accumulated force of , and greatly restricts the amount of oil discharged from the fluid pressure cylinder 13 flowing out from the introduction port 119 to the discharge port 121.

As a result, the cutting downward speed of the band saw blade housing 11 is significantly slowed down.

Cutting near the lower end of the material 7 to be cut is the same as cutting near the upper end, so a description thereof will be omitted.

In the horizontal bandsaw machine as an embodiment of the present invention described in detail above, changes in thrust force are controlled by the bell crank-shaped swinging member 5.
The dial 85 is responsive to the short arm of 1 and proportionally expands to actuate the conical head valve body 69 of the pressure reducing valve 53, and has the characteristic of responding sensitively.
For example, since it is provided on the surface plate 83 of the control device, the setting is extremely easy, and the disadvantages of the conventional device can be solved.

In addition, conventional devices used diaphragm valves and closed oil passages, which required adjustment and repair every time the rubber parts aged or oil leaked, but the device of this invention uses flowing hydraulic oil. Because it utilizes the same pressure, it also has the advantage of having fewer breakdowns and requiring almost no adjustment or repair.

As can be understood from the above description of the embodiments, the essential gist of the present invention is as stated in the claims for utility model registration, and as is clear from the description, in the present invention, the material to be cut is The fluid pressure cylinder 13 that allows the bandsaw blade housing 11 to approach and separate from the fluid pressure cylinder 13 relatively has a flow control valve equipped with a spool 87 that can freely adjust the flow rate of pressure oil discharged from the fluid pressure cylinder 13 to the oil tank 65. 59 is connected, and this flow rate control valve 59 is provided with an introduction port 61 through which pressure oil is introduced to control the sliding movement of the spool 87. Therefore,
By slidingly controlling the spool 87 of the flow rate control valve 59, the cutting depth of the band saw blade 9 into the material 7 to be cut can be controlled.

Particularly in the present invention, in order to control the sliding movement of the spool 87 in the flow control valve 59, the introduction port 61 of the flow control valve 59 is connected to the pump 15 via the pilot pressure piping 55, and the pilot pressure The pressure reducing valve 53 disposed in the hydraulic circuit branching from the piping 55 is equipped with a valve body 69 that is slidable in the axial direction of the communication hole from the introduction port 63 to the discharge port 67 of the pressure reduction valve 53 and that can freely open and close the communication hole. It has been done. The swinging member 51 and the valve body 69 are interlocked with the guide piece 35 that guides the back of the band saw blade.
are interlocked via a bullet 75 so that when the swinging member 51 is pushed by the guide piece 35, the valve body 69 moves in the direction of closing the communication hole of the pressure reducing valve 53.

Therefore, in the present invention, when the guide piece 35 is moved by the bandsaw blade 9 and the swinging member 51 is pushed, the valve body 69 moves in the direction of closing the communication hole of the pressure reducing valve 53 via the elastic machine 75. As a result, the pressure in the pilot pressure pipe 55 increases, and the spool 87 in the flow control valve 59 is moved to a position where it balances the increased pressure, and the flow rate of the pressure oil discharged from the fluid pressure cylinder 13 is increased. It will be controlled. At this time, the amount of movement of the spool 87 in the flow rate control valve 59 is not directly related to the amount of movement of the guide piece 35, but is related to the rise in pressure within the pilot pressure pipe 55, and the amount of movement of the spool 87 in the flow control valve 59 is A sufficient amount of pressure oil for movement can be supplied from the pump 15.

That is, according to the present invention, even if the amount of movement of the guide piece 35 is small, the spool 8 in the flow rate control valve 59
7 can be slid over a large distance, the entire pressure reducing valve 53 can be downsized, and it can be easily attached to the bandsaw blade guide section.

Furthermore, in the present invention, as is already clear, the movement of the guide piece 35 is converted into pressure within the pilot pressure pipe 55, and the spool 8 within the flow control valve 59 is
7 is slidably controlled, the control response of the flow control valve 59 to the movement of the guide piece 35 is good. Therefore, for example, when cutting a round bar, the cutting length gradually increases until it approaches the diameter.
After that, the cutting length gradually decreases, and the back force of the band saw blade gradually decreases. The time taken from the center position of the round bar to the end of cutting is the same, and the work efficiency is high.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a horizontal bandsaw machine implementing the present invention and its hydraulic circuit, Fig. 2 is an explanatory cross-sectional diagram around the pressure reducing valve, Fig. 3 is an explanatory cross-sectional diagram of the flow rate control valve and dial portion, 4 is a sectional view taken along the - arrow in FIG. 3, and FIG. 5 is a partial sectional view taken along the - arrow in FIG. Explanation of symbols representing main parts of the drawings: 1...Horizontal bandsaw machine, 13...Fluid pressure cylinder, 25...Fixed side guide arm, 35...Saw back regulating guide piece, 51
... Swinging member, 59 ... Flow rate control valve, 69 ... Conical head valve body.

Claims (1)

[Scope of utility model registration request] A band saw blade housing 11 that supports a band saw blade 9 for cutting a material 7 to be cut in a band saw machine is provided so as to be able to move toward and away from the material 7 to be cut, and a fluid that moves the band saw blade housing 11 relative to the material 7 to be cut is provided. A pressure cylinder 13 is provided, and a spool 87 that can freely adjust the flow rate of pressure oil discharged from the fluid pressure cylinder 13 to the oil tank 65 when the band saw blade 9 cuts into the material 7 to be cut is slid thereon. A flow rate control valve 59 is provided which is movable internally, and an introduction port 61 provided in the flow rate control valve 59 is connected to a pump via a pilot pressure pipe 55 in order to control the sliding movement of the spool 87 in this flow rate control valve 59. The introduction port 6 of this pressure reducing valve 53 is connected to the pressure reducing valve 53 which is connected to the pilot pressure pipe 55 and connected to the oil tank 65 and connected to the oil tank 65.
A band saw blade housing 11 is equipped with a valve body 69 which is slidable in the axial direction of the communication hole from 3 to the discharge port 67 and which can open and close the communication hole, and is provided in the band saw blade housing 11 to guide the band saw blade 9. A movable guide piece 35 that guides the back of the bandsaw blade 9 in the guide part,
A swinging member 51 that is swingably provided is interlocked and connected, and when the swinging member 51 is pushed by the guide piece 35, the valve body 69 closes the communication hole of the pressure reducing piece 53. A band saw machine characterized in that a swinging member 51 and a valve body 69 are interlocked and connected via a bullet 75 in order to move the band saw machine.