JPH0631918U - Vise device in cutting machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a vise device for a cutting machine capable of eliminating the rising of a work even if the force point of a fluid pressure cylinder for moving the moving vise is lower than the center point of the work. [Structure] A force point F at a moving vise 9M of a fluid pressure cylinder 9S provided for clamping and unclamping a work W on a support base 11 by a fixed vise 9F and a moving vise 9M is lower than a center point 0 of the work W. In the vise device 9 in the cutting machine shown in FIG. 3, the clamp side pressure chamber 25 of the fluid pressure cylinder 9S is connected to the fluid pressure three-position switching valve as the pressure control means 61, the neutral position of which is the ABR connection passage. It is characterized by being configured.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vise device in a cutting machine which prevents a work piece from rising.

[0002]

[Prior art]

 Conventionally, a fluid pressure circuit for opening and closing, for example, a main body vice device or a feed vice device as a vice device in a horizontal band saw machine as a cutting machine uses a fluid pressure three-position switching valve having a closed center flow path. It was

The main body vise device and the feed vise device are provided for clamping and unclamping a work on a support base by the cooperation of a fixed vise and a moving vise. The force point in the moving vise was located below the center position of the work.

[0004]

[Problems to be solved by the device]

 In the fluid pressure circuit for opening and closing the main body vise device of the cutting machine and the feed vise device known in the prior art, the neutral position of the fluid pressure three-position switching valve is the closed center flow path. As for the pressure in the pressure chamber of the fluid pressure cylinder, the pressure in the switching device in the preceding stage is maintained as it is. Therefore, opening and closing of the fixed vise and the moving vise had only two states of clamping and unclamping.

Moreover, as shown in FIG. 2, if the force point of the piston rod of the fluid pressure cylinder for moving the moving vise is lower than the center position of the work, that is, the point of action, the work is lifted up every time it is clamped. The problem is that This is because, for example, before the feed vise device enters the unclamping state, the main body vise device clamps the work piece that is still elevated so that the axial position of the work piece does not change.

An object of the present invention is to provide a vice device for a cutting machine that can prevent the workpiece from rising even if the force point of the fluid pressure cylinder for moving the moving vice is lower than the center position of the work. is there.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention relates to a moving vice of a piston rod of a fluid pressure cylinder provided for clamping and unclamping a work on a support base by cooperation of a fixed vise and a moving vise. A vise device in a cutting machine, the force point of which is located below the center position of the work, wherein pressure control means is connected to the clamp side pressure chamber of the fluid pressure cylinder.

Further, it is preferable that the pressure control means is composed of a fluid pressure 3-position switching valve which serves as an ABR connection channel at the neutral position.

[0009]

[Action]

 In the above structure, first, the work is placed on the support base, and then the piston rod of the fluid pressure cylinder is projected to bring the moving vise closer to the fixed vise side. It is pinched and clamped.

At this time, since the force point of the piston rod in the moving vise is below the center position of the work, the work is slightly elevated and clamped. In this state, the feeding vise device feeds the work to the body vise and the cutting tool side.

When the fluid pressure 3-position switching valve as the pressure control means is switched to the neutral position for a short time, the neutral position serves as the ABR connection fluid passage, so that the pressure chamber of the fluid pressure cylinder is The clamping force is weakened due to the decrease in the pressure on the workpiece, and the workpiece falls on the support table due to its own weight.

After that, the work is clamped by the main body vice device. That is, the work is clamped by the main body vise device after the fluid pressure three-position switching valve of the feed vise device is set to the neutral position for a short time. Thus, the feed vise device is in the unclamped state.

As described above, before the main body vise device clamps the work, the clamp of the feed vise device is loosened and the work is dropped on the support base by its own weight, and then the work is clamped by the main body vise device. Therefore, the phenomenon of rising of the work is prevented. Moreover, the workpiece is not unclamped by the feed vise device, and the clamp is simply loosened, so the workpiece does not move in the axial direction and the home position is not misaligned.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

First, an outline of, for example, a horizontal band saw machine (cutting machine) 1 as a known cutting machine will be described with reference to FIG.

In the cutting unit 3, for example, an endless band saw blade (cutting tool) B as a cutting tool can run from bottom to top in FIG. 3 and can move up and down (up and down in FIG. 3). It is provided freely.

On the front side (right side in FIG. 3) of the cutting processing section 3, a product receiving stand 5 for receiving a product obtained by cutting the work W is arranged. Further, on the rear side of the cutting processing unit 3 (on the left side in FIG. 3), there is provided a main body vice device 7 which is clamped when the work W is cut. A feeding vise device 9 for clamping W and feeding the work W in the front-rear direction (left-right direction in FIG. 3) is provided.

The main body vise device 7 is composed of a fixed vise 7F, a moving vise 7M, a fixed vise cylinder 7A for moving these in the clamping and unclamping directions, and a main body vise cylinder 7S. The fixed vise 7F is not fixed at all, and can be moved by a small stroke by the fixed vise cylinder 7A which is provided auxiliary to facilitate the loading of the work W.

The feeding vise device 9 includes a fixed vise 9F and a moving vise 9M, a fixed-stroke fixed vise cylinder 9A and a feeding vise cylinder (fluid pressure cylinder) 9S for moving these in the clamping and unclamping directions. It is composed of a support base 11 for supporting the work and a feed cylinder 13 for moving the support base 11 in the front-rear direction.

With the above configuration, when the work W is placed on the support base 11 between the fixed vise 9F and the moving vise 9M by a crane as shown in FIG. 3, the fixed vise cylinder 9A and the feed vise cylinder 9S are operated. Then, the work W is clamped by being sandwiched between the fixed vise 9F and the moving vise 9M. Further, by operating the feed cylinder 13, the work W is fed forward together with the support base 11.

If the front end of the work W has not reached the predetermined origin position, the fixed vise 9F and the moving vise 9M are once returned to the unclamped state, and then the support base 11 is moved backward by the feed cylinder 13. After that, perform the same operation as above to feed the work W forward.

In order to cut the work W into the product length C, the support base 11 is provided with a known position detecting device 15. The position detecting device 15 is composed of, for example, a pinion 17 supported by a support 11, a rotary encoder 19 and a rack 21 fixed to the main body of the horizontal band saw machine 1.

Further, in order to find the origin position of the work W, a stopper plate 23 is provided at the front end of the main body vice device 7 so as to be able to come into contact with and retract from the front end of the work W, for example. Since the contact retracting mechanism of the stopper plate 23 with respect to the work W is publicly known, its explanation is omitted.

With the above configuration, the work W is clamped by the feed vise device 9 and moved forward, and the front end face of the work W is brought into contact with the rear end face of the protruding stopper plate 23. Now that the work W has been positioned at the origin, the work W is clamped by the main body vice device 7.

After the feed vise device 9 is unclamped, it is retracted by the feed cylinder 13. After that, the work W is clamped by the feed vise device 9 and the main body vise device 7 is unclamped.

Then, the feed cylinder 13 is servo-controlled while receiving a signal from the position detection device 15 to advance the work W by a fixed dimension D. There is the following relationship between the fixed dimension D and the product length C. That is, D = (dimension from the front end of the stopper plate 23 to the rear end of the band saw B) + (cutting allowance of the band saw blade B) + (product length C).

Next, when it is desired to sequentially cut C-sized products, the feed vise device 9 may be advanced by (product length C) + (cutting margin of the band saw blade B). Of course, when cutting the work W with the band saw blade B, it is necessary to securely clamp the work W by the main body vice device 7.

By the way, the feed vise device 9 may clamp the work W when the work W is not clamped to the main body vise device 7, that is, in the free state. Further, as shown in FIG. 2, the feed vise device 9 generally moves the moving vise 9M and the fixed vise 9F more than the height of the center point 0 of the work W on the support 11 so that the feed vise cylinder 9S and the fixed vise cylinder 9A move. The position is lower than the force point F due to the piston rod.

Further, since the movable vice 9M and the fixed vice 9F move left and right (left and right in FIG. 2, up and down in FIG. 3) with respect to the support base 11, there is naturally mechanical play. Therefore, if the cross section of the work W is a circle or a polygon other than a quadrangle, a lifting force L that lifts the work W is generated. Therefore, if the work W is clamped in a free state, it will rise as shown in FIG. Even if the workpiece W in the rising state is clamped by the main body vice device 7 and cut by the band saw blade B, an accurate product shape cannot be obtained.

In order to eliminate the above-mentioned rising phenomenon, in this embodiment, the pressure in the clamp side pressure chamber 25 of the feed vise cylinder 9S is reduced to reduce the clamping force, and the work W is attached to the upper surface of the support base 11 by its own weight. The work W is clamped by the main body vice device 7 after it has been dropped.

A fluid pressure circuit diagram for performing the above operation is shown in FIG. First, a three-position electromagnetic directional control valve (fluid pressure three-position switch valve) 31 whose neutral position is an ABR connection flow path is provided from a pressure line 27 from a fluid pressure source (not shown) through a check valve 29. The flow path of the 3-position electromagnetic directional control valve 31 is switched by a solenoid a and a solenoid b. The P port is connected to the check valve 29, and the R port is connected to the return line 33 having no pressure.

The port A is connected to the unclip side pressure chamber 35 of the fixed vise cylinder 9 A and is connected to the unclamp side pressure chamber 37 of the feed vise cylinder 9 S via a pilot operation check valve 39. ing. Further, a spring type accumulator 41 is provided in parallel with the pilot operated check valve 39.

The B port is connected to the clamp side pressure chamber 43 of the fixed vise cylinder 9A, and is connected to the clamp side pressure chamber 25 of the feed vise cylinder 9S via the flow rate adjusting valve 45 with a built-in check valve. Is connected. A small cylinder 47 is provided between the clamp side pressure chamber 25 and the pressure line 27 so that a limit switch 49 can be operated. Further, a flow rate adjusting valve 51 and a check valve 53 are provided in series between the clamp side pressure chamber 43 and the unclamp side pressure chamber 37.

The pilot operated check valve 39 is operated by a pilot line 57 connected to the B port of the spring offset two-position electromagnetic directional control valve 55. The two-position electromagnetic switching valve 55 is switched by the solenoid C.

Further, in the fluid pressure circuit of the main body vise device 7 on the left side in FIG. 1, a 3-position electromagnetic directional switching valve 59 in which the flow path at the neutral position is a closed center is used instead of the 3-position electromagnetic directional switching valve 31. Other than that, the fluid pressure circuit is exactly the same as that of the feed vise device 9, and therefore corresponding parts are designated by the same reference numerals and description thereof is omitted. The 3-position electromagnetic direction switching valve 59 is switched by solenoids d and e.

The operation of the fluid pressure circuit of the feed vise device 9 having the above configuration will be described. First, when the solenoid a is excited, the A port of the 3-position directional control valve 31 is connected to the pressure line 27 and the B port is connected to the return line 33, so that the fixed vice cylinder 9A is in an unclamped state and the accumulator is in the unclamped state. 41 is pressured. When the solenoid C is excited there, the two-position electromagnetic directional control valve is switched and pressure fluid is applied to the pilot line 57, so that the pilot operated check valve 39 can flow backward, so the pressure fluid flows to the accumulator 41. Since the amount of the stored pressure is added and flows into the unclamp side pressure chamber 37, the feed vice cylinder 9S is rapidly unclamped.

Therefore, when the work W is placed on the support 11, the solenoids a and c are released and the solenoid b is excited, the three-position electromagnetic directional control valve 31 is switched, and the A port is returned to the return line 33. And the B port is connected to the pressure line 27. Then, first, the fixed vise cylinder 9A is rapidly clamped, that is, the fixed vise 9F moves to a fixed position, and the adjusted pressure fluid flows into the clamp side pressure chamber 25 via the flow rate adjusting valve 45. The vice cylinder 9S is clamped after a delay. At the same time, the limit switch 49 is switched by the small cylinder 47 to notify the completion of the clamp. Further, the work W is clamped by being sandwiched between the fixed vise 9F and the movable vise 9M, but as shown in FIG. 2, the work W is lifted up from the support base 11.

After the work W is raised, as described above, the work W is advanced to the desired position by the feed cylinder 13, and after ₁ second, the solenoid b is operated for a short time, that is, T _0. De-energize only for a second. Then, the three-position electromagnetic directional control valve 31 is in the neutral position and the A, B, and R ports are connected, so that the pressure in the clamp side pressure chamber 25 of the feed vise cylinder 9S decreases. Accordingly, the clamping force is weakened and the work W falls to the support base 11 by its own weight, so that the rising phenomenon is eliminated.

After that, by exciting the solenoid b again to re-clamp the work W and exciting the solenoid e, the fixed vise cylinder 7A and the main body vise cylinder 7S of the main body vise device 7 are clamped. Therefore, the work W is clamped by the main body vice device.

Then, by releasing the solenoid b and exciting the solenoid a, the feed vise device 9 is unclamped, and then the feed cylinder 13 is appropriately operated to leave the work W left. The feeding vise device 9 is retracted. Then, the work W is cut by the band saw blade B in the cutting processing section 3, and the product falls on the product receiving table 5.

As described above, according to this embodiment, after the feeding vice device 9 clamps the work W and feeds the material, the neutral position as the pressure control means is the 3-position electromagnetic direction in which the ABR connection flow path is formed. By placing the switching valve 31 in the neutral position for a short time T ₀ seconds, the pressure in the clamp side pressure chamber 25 of the feed vise cylinder 9S can be reduced.

Therefore, the work W climbed up by the clamp is dropped onto the support base 11 by its own weight, and the climbing phenomenon is eliminated. Further, since the work W is not unclamped, it does not move freely in the axial direction before being clamped by the main body vice device 7. Therefore, there is an effect that accurate cutting can be expected and an accurate product can be obtained.

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

For example, in the present embodiment, as the pressure control means 61 of the clamp side pressure chamber 25, the 3-position electromagnetic directional control valve 31 whose neutral position is the ABR connection flow path is used, but instead the neutral position is throttled. If the 3-position electromagnetic directional control valve of the attached ABR connection flow path is used, the pressure in the clamp side pressure chamber 25 can be easily adjusted. However, since the ABR connection flow passage with a throttle at the neutral position is also considered as one of the ABR connection flow passages, both of the three-position electromagnetic directional control valves may be considered as switching valves that belong to the same category.

Further, as shown in FIG. 4, for example, as the pressure control means 61, a variable throttle valve 63 and a two-position electromagnetic directional control valve 65 having a spring offset are connected in series to the clamp side pressure chamber 25, and the return line 33 is provided. It is also possible to think of a way to escape. That is, by exciting the solenoid f of the two-position electromagnetic directional control valve 65 for T ₀ seconds, the pressure in the clamp side pressure chamber 25 can be appropriately reduced. However, a three-position electromagnetic directional switching valve whose neutral position is the closed center channel is used as the switching valve that operates the feed vice cylinder 9S.

Further, as shown in FIG. 5, for example, as the pressure control means 61, means for connecting the variable throttle 63 and the pilot operated check valve 67 in series to the clamp side pressure chamber 25 and allowing them to escape to the return line 33 is also considered. To be In this case, in order to operate the pilot operated check valve 67, a spring offset 2-position electromagnetic directional control valve 69 may be separately provided as shown in FIG. 5, but the 2-position electromagnetic directional control valve 55 in FIG. Can also be used together. In any case, as in the embodiment shown in FIG. 4, a three-position electromagnetic directional switching valve whose neutral position is the closed center flow path is used as the switching valve that operates the feed vice cylinder 9S.

Further, although the feeding vise device has been described as an example of the vise device of the present embodiment, it can be applied to the main body vise device.

[0048]

[Effect of device]

 As can be understood from the above description of the embodiment, according to the present invention, when the workpiece is clamped by the vice device, the pressure in the pressure chamber of the fluid pressure cylinder is lowered via the pressure control means.

Therefore, the work that has climbed up by the clamp falls on the support table by its own weight, but there is no unexpected axial movement unlike the unclamped state. Therefore, there is an effect that accurate cutting can be expected.

[Brief description of drawings]

FIG. 1 is a fluid pressure circuit diagram according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram regarding rising of a work.

FIG. 3 is an explanatory plan view of a horizontal band saw machine as a cutting machine.

FIG. 4 is a fluid pressure circuit diagram showing an essential part of another embodiment of the present invention.

FIG. 5 is a fluid pressure circuit diagram showing a main part in still another embodiment of the present invention.

[Explanation of symbols]

 1 Horizontal Band Saw Machine (Cutting Machine) 9 Feed Vise Device 9F Fixed Vise 9M Moving Vise 9S Feed Vise Cylinder (Fluid Pressure Cylinder) 11 Support Stand 25 Clamp Side Pressure Chamber 31 3 Position Electromagnetic Directional Change Valve (3 Fluid Position Change Valve) 61 Pressure control means F Power point O Center point W Work

Claims (2)

[Scope of utility model registration request] 1. A force point in the moving vise of a piston rod of a fluid pressure cylinder, which is provided for clamping and unclamping a work on a support base by cooperation of a fixed vise and a moving vise, a center position of the work. A vise device for a cutting machine located below, wherein a pressure control means is connected to a clamp side pressure chamber of the fluid pressure cylinder. 2. The feed vice device for a cutting machine according to claim 1, wherein said pressure control means comprises a fluid pressure three-position switching valve which is an ABR connection channel at a neutral position.