JP2003145273A - Cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a damage to a torch even when the torch collides with a work. SOLUTION: A torch holder 25 on which the torch 31 is attached is so fitted as to be relatively movable with respect to a holder 17. When a cutting nozzle collides with the work during a cutting of the work with the torch 30, the impulsive force of the collision drives the torch 30 up against the spring force of a coil spring 39 and the impulsive force due to the collision is absorbed and relaxed. An hermetically sealed space part 41 is filled with air at a prescribed pressure and the air pressure in the hermetically sealed space part 41 is monitored with a monitoring means and the monitoring means has a pressure sensor with which the air pressure in the hermetically sealed space part 41 is measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting machine for cutting a metal plate by generating plasma between a torch and a metal plate as a work.

[0002]

2. Description of the Related Art A cutting machine of this type, for example, a cutting machine for generating a high-power plasma to cut a metal plate, has a solid line in FIG. 6 in order to improve the bevel angle of the cut surface of the metal plate. As shown in FIG. 4, the distance L between the cutting nozzle 1 at the tip of the torch and the work W, which is a metal plate, is set to be smaller by about several mm than that of a low-power plasma cutting machine, and is set to 4 m.
The distance L is about m.

[0003]

By the way, since the conventional cutting machine is a high-power plasma type, the distance L between the cutting nozzle 1 of the torch and the work W is selected to be small. Since a cutting groove is provided in the cutting nozzle 1, the cutting nozzle 1 is tilted at a predetermined angle as shown by a chain line in FIG. 6 while the interval L is maintained, and the cutting work is performed in this tilted state. When it collides with W, there is a problem that the torch as well as the cutting nozzle 1 is damaged by the impact force. In addition, if the torch or the like is damaged due to a collision, the torch or the like must be replaced, and it takes time to restore the torch.

The present invention has been made in consideration of such circumstances, and an object thereof is to prevent damage to the torch even if the torch collides with a work, and to promptly restore the torch. It is to provide a cutting machine that can also do.

[0005]

In order to achieve the above object, the present invention proposes the following means. The invention according to claim 1 is a cutting machine for cutting a work by a torch, comprising a holder that can be swung and rotated, and a torch holder attached to the holder by mounting the torch.
The torch holder is characterized in that the torch holder is attached to the holder so as to be relatively movable in a direction to mitigate the impact force when the torch collides with a work.

According to the cutting machine of the present invention, when an impact force is generated when a work collides with the torch, the impact force causes the holder and the torch holder to move relatively, and the movement causes the impact force to the torch. It is absorbed and relaxed, and it is possible to prevent the torch from being damaged by the collision with the work.

According to a second aspect of the invention, in the cutting machine according to the first aspect, an airtight space portion for enclosing air is formed between the holder and the torch holder, and when the air pressure in the airtight space portion is reduced. , And has a monitoring means for stopping the cutting operation of the torch.

According to the cutting machine of the present invention, when the torch collides with the work, the torch holder moves relative to the holder, the airtight space between the holder and the torch holder is opened, and the air pressure in the airtight space decreases. Since the sensor of the monitoring means detects the decrease in the air pressure, the monitoring means stops the torch cutting operation.

According to a third aspect of the present invention, in the cutting machine according to the first or second aspect, there is provided a biasing mechanism that biases the torch holder toward the tip of the torch along the axial direction of the torch with respect to the holder. Is characterized by. According to the cutting machine of the present invention, since the torch holder is only supported by the holder by the biasing mechanism, the holder and the torch holder may be set to the original position so as to resist the biasing mechanism,
Even if the holder and the torch holder move relative to each other due to an impact, the effect of being able to quickly recover is obtained.

[00010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are views showing a cutting machine according to an embodiment of the present invention, FIGS. 1 and 2 are a front view and a plan view of the cutting machine, and FIG. 3 is a configuration of a torch peripheral portion in the cutting machine. FIG. 4 is a side view of FIG. 3, and FIG. 5 is an enlarged view of an essential part showing the relationship between the torch holder and the holder. In FIG. 1 and FIG. 2, reference numeral 10 is a high-power plasma type cutting machine, which is provided with a moving body 13 which is movable along a rail 12 in the X direction on a processing table 11, and which is provided with the moving body 13. , And Y that is orthogonal to the X direction
A cutting machine body 14 is provided so as to be movable in any direction. A swivel arm 15 is provided in the cutting machine body 14 so as to swivel about a vertical axis in a horizontal plane, and a holder 17 is attached to the lower part of the swivel arm 15 so that the holder 17 can be swung in the vertical plane by a turning mechanism (not shown). A torch 30 is provided in the holder 17. Therefore, the holder 17 is the torch 3
It is possible to rotate 0 around a vertical axis and rotate in a vertical plane.

A fine angle adjustment mechanism 20 is provided between the swivel arm 15 and the holder 17. The fine angle adjustment mechanism 20 has a recess 21 formed at the tip of the bracket 16 as shown in FIG. At the same time, a recess 22 is also provided on the outer periphery of the holder 17, and when the round bar 23 is inserted between the recesses 21 and 22 and sandwiched between the bracket 16 and the holder 17, the bracket 16 and the holder 17 are bolts 24a ,. Two
4b and the relative tightening force between the bolts 24a and 24b is adjusted so that the holder 17 can rotate about the round bar 23 by a slight angle. Although not shown in detail, the bracket 1
The rotating mechanism is provided between 6 and the revolving arm 15.

The holder 17 has a tubular shape, and as shown in FIGS. 3 and 5, a torch holder 25 having a torch 30 mounted therein is provided therein. Torch holder 2
5 has a torch adapter 31 mounted inside through bearings 26, 26. The torch 30 is fitted and inserted in the torch adapter 31, and the torch 30 is configured to integrally include the torch adapter 31 around the torch 30 and the cutting nozzle 32 attached to the tip.

A piston head 33 is provided on the outer circumference of the torch adapter 31 and the torch holder 2 is provided.
A cylinder tube 34 is fitted into the cylinder tube 5, and fluid chambers 35a and 35b are formed in the cylinder tube 34 at the upper and lower portions of the piston head 33. Then, the fluid chamber 35
The piston head 33 moves up and down in the cylinder tube 34 by supplying and discharging the fluid to and from the pipes 36 and 36. That is, the torch 30 can rotate in the circumferential direction with respect to the torch holder 25, and can move up and down along the central axis direction of the torch 30. Note that FIG.
A bearing cap 37 is provided on the torch holder 25.

On the other hand, the torch holder 25 to which the torch adapter 31 is attached is attached so as to be movable relative to the holder 17. That is, FIG. 3 and FIG.
As shown in FIG. 3, the flange 25 a of the torch holder 25 and the bearing cap 37 are inserted into the upper portion of the holder 17 to attach the bolt 38, and the coil spring 39 is contracted between the head of the bolt 38 and the bearing cap 37. The spring force of the coil spring 39 causes the bearing cap 37
The collar portion 25a of the torch holder 25 is biased toward the holder 17 side via the.

When the cutting nozzle 32 collides with the work W when the work W is cut by the torch 30, the impact force causes the torch 30 to rise against the spring force of the coil spring 39, resulting in an impact at the time of collision. The torch 30 is adapted to absorb and relax the force, and accordingly, the torch 30 moves relative to the holder 17 in a direction of absorbing and relaxing the impact force.

Further, inside the holder 17, a protrusion 17a is provided at an intermediate position in the height direction, and a protrusion 17b is also provided on the lower portion. The protrusion 17a and the protrusion 17b.
By contacting the torch holder 25 via the O-rings 40, 40, an airtight space 41 is formed between the holder 17 and the torch holder 25. In this case, the O-ring 40 is fitted in a recess (not shown) provided in the torch holder 25. In addition to the O-ring 40, O-rings 42 to 46 are provided to obtain a predetermined airtightness (see FIGS. 3 and 5).

Further, air is sealed in the airtight space 41 at a predetermined pressure by means not shown, and the air pressure in the airtight space 41 is monitored by the monitoring means 50 shown in FIG. The monitoring means 50 is the airtight space section 4.
It has a pressure sensor 51 for measuring the air pressure in the inside 1.
In this monitoring means 50, the torch holder 25 causes the holder 1 to move when the cutting nozzle 32 collides with the work W during cutting.
7, the protrusions 17a, 17b of the holder 17 are disengaged from the O-rings 40, 40 to open the airtight space 41, and the pressure sensor 51 detects a decrease in air pressure due to the opening, so that the torch 30 is disconnected. It is supposed to stop the work.

Since the cutting machine of this embodiment has the above-mentioned structure, the torch 30 is used for cutting the work W.
Is rotated and tilted at a predetermined angle, and the main body 14 moves in accordance with a predetermined program in the tilted state, thereby performing a cutting operation by plasma fusing. At the time of the above cutting work, the torch 30 is tilted and a few meters from the work W.
Since the cutting is performed at an interval of m (for example, about 4 mm in the inclined state of 15 degrees or more), when the cutting nozzle 32 of the torch 30 collides with the work W, the cutting nozzle 32 and the torch 30 may be damaged by the impact force.

However, since the torch holder 25 on which the torch 30 is mounted is attached so as to be movable relative to the holder 17, when an impact force is generated in the torch 30 upon collision, the torch holder 25 is coiled by the impact force. It moves relative to the holder 17 against the biasing force of the spring 39. Then, the movement absorbs and relieves the impact force on the torch 30, so that the torch 30 and the cutting nozzle 32 can be prevented from being damaged by the collision with the work W.

When the torch holder 25 moves relative to the holder 17, the protrusions 17a and 17b of the holder 17 are disengaged from the O-rings 40, 40, so that the airtight space 41 between the holder 17 and the torch holder 25 is opened. When the airtight space 41 is opened, the air pressure in the airtight space 41 decreases, and the pressure sensor 51 of the monitoring means 50 detects the decrease in the air pressure, so the monitoring means 50 temporarily cuts the torch 30. Stop. That is, when the torch 30 receives an impact force such that the torch holder 25 is displaced from the holder 17, the cutting operation is interrupted, so that the torch damage prevention effect can be enhanced.

Further, although the torch holder 25 is disengaged from the holder 17 due to the relative movement, the torch holder 25
Is supported by the coil spring 39, the holder 17, the torch holder 25, and the bearing cap 37 are lifted, and the protrusions 17a and 17b of the holder 17 may be brought into contact with the O-ring 40 on the torch holder 25 side. It can be easily set back to its original position, which allows quick recovery.

Therefore, according to this embodiment, the holder 1
Since the torch holder 25 is supported by the biasing force of the coil spring 39 on the torch 7, even if an impact force acts on the torch 30, the torch 30 can be prevented from being damaged and the recovery can be performed promptly. Reliability as. In the illustrated embodiment, the example in which the coil spring 39 is provided on the bolt 38 erected on the holder 17 is shown, but the present invention is not limited to the coil spring 39, and another biasing mechanism can be substituted. is there.

[0023]

As described above, according to the first aspect of the present invention, when the torch collides with the work, the impact force of the torch holder causes the holder and the torch holder to move relatively to absorb the impact force of the torch. Since it is configured to be relaxed,
It is possible to reliably prevent the torch from being damaged by the collision with the work.

According to the second aspect of the present invention, when the torch collides with the work and the airtight space is opened, the monitoring means interrupts the cutting work of the torch. It is possible to increase the reliability of the device.

According to the third aspect of the invention, since the torch holder is only supported by the holder by the urging mechanism, there is an effect that the holder and the torch holder can be promptly restored even if the holder and the torch holder are relatively moved by an impact. can get.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a cutting machine according to an embodiment.

FIG. 2 is a plan view showing the same cutting machine.

FIG. 3 is an explanatory diagram showing a main part of a cutting machine.

FIG. 4 is a side view of FIG.

5 is an enlarged view of a main part of FIG. 3 showing a relationship between the torch holder and the holder.

FIG. 6 is an explanatory diagram showing the relationship between the cutting nozzle of the torch and the work.

[Explanation of symbols]

10 cutting machine 15 swivel arm 17 Holder 17a, 17b protrusion 25 torch holder 30 torch 32 cutting nozzle 38 Volts 39 coil spring 40 O-ring 41 Airtight space 50 Monitoring means 51 Pressure sensor

Claims (3)

[Claims] 1. A cutting machine for cutting a work by a torch, comprising: a holder that can be swung and rotated and a torch holder attached to the holder by mounting the torch. The torch holder is a holder and the torch is a work. A cutting machine, which is mounted so as to be capable of relative movement in a direction in which the impact force at the time of collision is mitigated. 2. The cutting machine according to claim 1, wherein an airtight space portion for enclosing air is formed between the holder and the torch holder, and the torch cutting operation is performed when the air pressure in the airtight space portion decreases. A cutting machine comprising a monitoring means for stopping. 3. The cutting machine according to claim 1, further comprising a biasing mechanism that biases the torch holder toward the tip of the torch along the axial direction of the torch with respect to the holder. .