JPH10328841A - Torch position adjustment device of plasma automatic cutting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize cutting precision in the case deformation of waving, warping, etc., is generated to a material to be cut by using a work copying guide abutting on a material surface to be cut and cutting while maintaining a prescribed cutting height to a torch. SOLUTION: A torch mounting member 8 movable up/down directions is mounted to a elevation member 3 mounted to a device base material 1, further, a work copying guide 24 protruding more to a material W side than a tip of a plasma arc torch 23, which mounted to its lower part, is arranged. In cutting, the work guide 24 is abutted on a surface of the material W to be cut at first and is turned to a floating state together with the elevation member 3. At this state, by lower part/upper part up/down adjustment mechanisms 18, 14, based on a torch elevation quantity H2 as a prescribed cutting height is H and a picering height is H1 +H2 , a descended end position and an ascended end position of the torch mounting member 8 are set. Next, piercing is conducted while setting a torch height to H1 +H2 based on this set position. Successively, a torch height is switched to H1 , cutting is conducted with copying a work W surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a torch position adjusting device for an automatic plasma cutting machine.

[0002]

2. Description of the Related Art Generally, in an automatic plasma cutting machine,
A cutting operation is performed while maintaining a desired distance between the tip of the plasma arc torch and the surface of the workpiece.

[0003] By the way, the conventional plasma automatic cutting machine,
As shown in FIGS. 11 to 13, a moving member 82, which is restrained by guide members 81, 81 provided on the base material 1 and is movable in the vertical direction, and a female screw 821 screwed on the moving member 82 are screwed. A male screw member 83 to be combined, a motor 84 for rotating the male screw member 83, a plasma arc torch 85 attached to the moving member 82, and an optical eye tracer, that is, an optical sensor 86. I have.

At the time of this cutting operation, a so-called piercing process is performed in which a through hole is formed in the workpiece W by a plasma jet ejected from the plasma arc torch 85. After the piercing process, the plasma arc torch 85 is connected to the piercing process. The plasma cutting is performed while appropriately moving the workpiece W relatively, for example, in the horizontal direction.

In the piercing and cutting processes, the plasma arc torch 85 for the material W to be cut is used.
The height of each of the piercing height and cutting height is
It is set to a desired value corresponding to the thickness of the workpiece W. To cope with this, the motor 84 is driven while detecting the surface of the material W to be cut by the optical sensor 86, and the position of the plasma arc torch 85 is adjusted to the desired piercing height and cutting height. Is controlled. Of course, in the above-described conventional plasma automatic cutting machine, the detection signal of the optical sensor 86 and the motor 84 based on the detection signal are used.
A fine cutting operation is performed by the control.

[0006]

However, the above-mentioned conventional configuration has the following problems. That is, at the time of the cutting operation, cut high-temperature melt, so-called spatter, high-temperature plasma jet, and fumes of the material to be cut are generated, and these sputters and fumes adhere to the optical sensor 86. By the way, in the automatic machine, since the plasma cutting operation is continuously performed, the amount of spatter or fume adhering to the optical sensor 86 is surely increased. The sensor function of the sensor 86 decreases. Of course, if the sensor function deteriorates, it is not possible to control the position of the plasma arc torch so that the piercing height and the cutting height are accurate. The operation of removing the extraneous matter must be performed, and the operation of removing the extraneous matter is troublesome.

Further, an electric control mechanism including an optical sensor is not only complicated and expensive, but also has an electric control mechanism including a connection portion caused by fumes or high-temperature spatter of a material to be cut generated at the time of cutting. It was apt to break down and repair was troublesome.

[0008] Furthermore, when the optical sensor is broken by another device by mistake when the optical sensor is brought into contact with the optical sensor at the time of cutting or before and after the cutting, the expensive optical sensor must be replaced. Was.

Further, during the cutting operation, since the plasma arc heat is transmitted to the material to be cut, the thin plate is undulated or warped particularly when the thin plate is cut. In this case, since the sensing state of the optical sensor with respect to the workpiece is different from the initial state, the piercing height and the cutting height of the plasma arc torch are different from the initial state, that is, the desired height, and the cutting result is not constant. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to enable the height of a plasma arc torch to be easily set in accordance with the thickness of a material to be cut, and to be inexpensive and In particular, it is an object of the present invention to provide a torch position adjusting device for an automatic plasma cutting machine capable of uniformly cutting a thin plate.

[0011]

The first invention is applied to a torch position adjusting device of an automatic plasma cutting machine. The feature is that an elevating member which is constrained by a guide member provided on the base material and is movable in the vertical direction, and the cylinder rod is movable vertically with respect to the elevating member, and when the cylinder rod is retracted. A fluid pressure operating cylinder that lifts the lifting member against gravity, an adjusting rod for a lifting member that is screwed to the base material so that the vertical position can be adjusted, and that controls the lowering position of the lifting member, and is mounted on the lifting member. A torch mounting member movably supported in a vertical direction, a drive mechanism for moving the torch mounting member up and down, and a torch disposed above and below the torch mounting member and in contact with the torch mounting member to be moved up and down. An upper and lower vertical adjustment mechanism that allows the vertical position of the mounting member to be set freely, a plasma arc torch mounted on the torch mounting member, and a Is that formed by and a workpiece scanning guide projecting workpiece side than the tip of Zuma arc torch.

[0012] The second invention is the first invention, wherein
A spring member for urging the lifting member upward is interposed between the base material and the lifting member.

According to a third aspect of the present invention, in the first or second aspect, the workpiece copying guide is detachably attached to the elevating member.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the driving mechanism comprises a hydraulic cylinder.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. 1 through 6, 3, is constrained by a guide member 2 provided on the substrate 1, a vertical direction, i.e. in a freely elevating member move in the Z direction, the lower and the Y ₁ direction of the lifting member 1 Y ₂ in the direction of the upper, first and second holes 301 and 302 penetrating the respective Z-direction
Are drilled.

Reference numeral 4 denotes a hydraulic cylinder, for example, an air cylinder attached to the base material 1, and a tip fitting 5 is integrally attached to a cylinder rod 401 of the air cylinder 4. The end fitting 5 has a columnar portion 501 that is inserted into the first hole 301 and is movable with respect to the first hole 301, and a flange portion 502 that is wider than the columnar portion 501.

Reference numeral 6 denotes an adjusting rod for a lifting member which is screwed to the base member 1 so that the vertical position can be adjusted. The adjusting rod 6 has a step 601 formed at the center and is located above the step 601. Is formed with a cylindrical portion 602 which is inserted into the second hole 302 and is movable with respect to the second hole 302. Note that a handle 603 for rotating operation is attached to the upper end of the columnar part 602. Of course, it is preferable to provide a scale plate on the base material 1 in order to grasp the vertical position of the step portion 601.

Reference numeral 7 denotes a coil-shaped spring member elastically provided between the base member 1 and the elevating member 3, for example. Reference numeral 8 denotes a torch mounting member mounted on the elevating member 3 and supported so as to be vertically movable. Thus, for example, it is configured to be restrained by a guide member 9 attached to the elevating member 3 and to be vertically movable.

A driving mechanism 11 is attached to the elevating member 3 and moves the torch mounting member 8 up and down. For example, a fluid pressure operating cylinder, preferably an air cylinder 12, and a tip attached to a cylinder rod 121 of the air cylinder 12 are provided. The drive mechanism 11 is constituted by the metal fitting 13.
In the case shown, the tip fitting 13 is attached integrally with the torch attachment member 8.

Reference numeral 14 denotes a position above the torch mounting member 8,
An upper / lower adjustment mechanism provided on the elevating member 3, for example, the upper / lower adjustment mechanism 14 includes an adjusting rod 15 with a handle, which is disposed on the elevating member 3 so as to be capable of vertically moving.
It is constituted by a setting tool capable of appropriately setting the tip position of the adjusting rod 15, for example, a so-called lock nut 16 which is screwed into the male screw 151 of the adjusting rod 15. In order to be able to grasp the position of the tip of the adjustment rod 15, for example, a large-diameter collar, that is, a pointer 152 is provided on the handle of the adjustment rod 15.
It is preferable to provide a scale plate 17 from which the position 2 can be read.

Reference numeral 18 denotes a position below the torch mounting member 8,
For example, the lower vertical adjustment mechanism 18 disposed on the elevating member 3 is disposed so that the long axis is in the Y direction, and is rotatably supported by the elevating member 3. An adjustment rod 19 with a lock and a male screw 19 of the adjustment rod 19 which is restrained by the elevating member 3 so as to be movable in the Y direction.
Adjustment piece 2 screwed to 1 and the position in the Y direction is appropriately set
1. Incidentally, the upper surface of the adjusting piece 21 is tapered surface 211 down to Y ₁ direction is formed. Of course, like the upper and lower adjustment mechanism 14, the adjustment piece 21
It is preferable to provide a pointer and a scale plate relatively to the lifting member 3.

A contact piece 22 is fixed to the lower end of the torch mounting member 8 facing the adjustment piece 21, and is formed on the lower surface of the contact piece 22 when the torch mounting member 8 is lowered. tapered surface 221 down to Y ₁ direction is brought into contact with tapered surface 211 of the adjusting piece 21.

Reference numeral 23 denotes a plasma arc torch mounted on the torch mounting member 8, and reference numeral 24 denotes a work copying guide detachably attached to a lower portion of the elevating member 3, and a plurality of the work copying guides 24, for example, a plasma arc torch. 2
Two are disposed at positions opposing each other across three.

The workpiece copying guide 24 is provided with the workpiece W
It is preferable to attach a rotatable spherical body, a so-called free bearing, to the tip of the workpiece copying guide 24 in order to move in the horizontal direction relatively to the workpiece W while abutting on the surface of the workpiece.

The above 1 to 24 constitute a torch position adjusting device of the automatic plasma cutting machine. The operation of the torch position adjusting device of the automatic plasma cutting machine having the above configuration will be described. The piercing height H ₁ + H ₂ and the cutting height H ₁ of the plasma arc torch are, for example, as shown in Table 1 depending on the current value for plasma generation supplied at the time of cutting.
Are adopted.

[0026]

[Table 1]

<Usage Example 1> A case where the thickness of the material to be cut is particularly thin, for example, a case where the thickness is 3.2 mm or less will be described. In this case, the elevating member for adjusting rod 6 by screwing the Z ₁ direction and allowed to retract the stepped portion 601 in the Z ₁ direction.

1 to 6, first, the air cylinder 4 is driven so that the cylinder rod 401 is retracted. In this case, the flange portion 502 of the tip fitting 5 attached to the cylinder rod 401 comes into contact with the lower end surface of the first hole 301 formed in the elevating member 3. The lifting member 3 is supported by the guide member 2 so as to be movable in the vertical direction while being restrained by the guide member 2.
Is in contact with the lower surface of the first hole 301, and the tip fitting 5 and the elevating member 3
_The elevating member 3 is moved in _two directions and retracts to the position of the stroke end of the air cylinder 4. That is, in this case, the workpiece copying guide 24 retreats to the position shown by the two-dot chain line in FIG.

In this state, for example, a thin workpiece W is placed on a sword-shaped work table. Thereafter, the air cylinder 4 is moved so that the cylinder rod 401 protrudes.
Is driven. That is, when the elevating member 3 the tip fitting 5 which is locked in the Z ₂ direction is moved in the Z ₁ direction, by the weight of the weight and the lifting member 3 of each unit mounted on the lift member 3 is vertically movable member 3 lowered the Z ₁ direction, the workpiece copying guide 24 abuts against the surface of the workpiece W.

In this state, the upper surface of the flange portion 502 of the tip fitting 5 is located, for example, several mm below the lower end surface of the first hole 301 formed in the elevating member 3. That is, while the workpiece copying guide 24 attached to the elevating member 3 is in contact with the surface of the workpiece W,
The work copying guide 24 is disposed in a so-called floating state so as to be vertically displaceable.

In this state or before or after this state, the adjusting rod 19 is appropriately operated so that the lower end of the plasma arc torch 23 is moved from the surface of the material W to be cut, for example, from the relation between the pointer and the scale plate. position of the adjusting piece 21 is set to be the upper position by a distance H _1.

When the air cylinder 12 is driven so that the cylinder rod 121 projects in a state where the position of the adjustment piece 21 is set as described above, the contact piece 22 fixed to the torch mounting member 8 causes the adjustment piece 22 to move. 21 to abut the lower end and the surface and the distance H ₁ of workpiece W of the plasma arc torch 23, the torch 23 is positioned so cutting the height H ₁ position.

That is, the position of the lower end of the torch mounting member 8 with respect to the elevating member 3 is set by the lower vertical adjustment mechanism 18.

In this state or before or after this state, the adjusting rod 15 and the lock nut 16 are appropriately rotated, and the distance between the tip of the adjusting rod 15 and the upper surface of the torch mounting member 8 becomes H. It is set to be _2. in this case,
May be measured a distance H _2, but the pointer 152 and the scale plate 17
And, the position of the adjusting rod 15 is set so that the distance H _2.

That is, the amount of elevation H ₂ of the torch mounting member 8 is set by the upper and lower adjustment mechanism 14.

Accordingly, when the air cylinder 12 is driven so that the cylinder rod 121 is retracted, the plasma arc torch 23 is positioned at a position where the upper surface of the torch mounting member 8 is in contact with the adjusting rod 15. The surface of this case, since the plasma arc torch 23 located above the surface of the workpiece W by the distance H ₁ is positioned displaced upwards further by a distance H _2, eventually lower the workpiece W of the plasma arc torch 23 DOO interval H ₁ + H _2, so-called piercing height; H ₁ + plasma of H ₂ and a position arc torch 23
Is positioned.

As described above, the piercing process is performed by the plasma arc while the air cylinder 4 is driven so that the cylinder rod 401 projects and the air cylinder 12 is driven so that the cylinder rod 121 retracts.

In this case, the torch mounting member 8 is
, The plasma arc torch 23 is positioned at a position of the so-called piercing height; H ₁ + H ₂ ,
Piercing is started.

During the piercing process until a through hole is formed in the workpiece W, the plasma jet ejected from the plasma arc torch 23 comes into contact with the surface of the workpiece W, and the rebound jet and Spatter scatters upward. For this reason, when the workpiece W and the plasma arc torch 23 are relatively moved during the piercing so that the plasma arc torch 23 is displaced in the horizontal direction, it is possible to prevent adhesion of spatter to the plasma arc torch 23 and to speed up the piercing. I can do it.

Needless to say, the piercing time is as short as several seconds, and the plasma arc torch 23 descends as the surface of the workpiece W is gradually cut from the start of the piercing so as to cut immediately after the piercing. Then, the cylinder 12 is driven at a low speed.

As described above, when the through-hole is formed in the workpiece W, the contact piece 22 comes into contact with the adjustment piece 21 immediately before or after the through-hole is formed. While this state is maintained, that is, while the plasma arc torch 23 is positioned so as to have the above-described cutting height H ₁ , the cutting is performed while the plasma arc torch 23 and the workpiece W are relatively moved in the horizontal direction. Processing is performed.

By the way, as the cutting operation progresses, the thin material W to be cut becomes wavy or warped. In this case, as described above, the workpiece copying guide 2
Since the lifting member 3 and the workpiece copying guide 24 are vertically displaceable while the abutment 4 is in contact with the surface of the workpiece W, even if the surface state of the workpiece W changes,
The workpiece copying guide 24 follows. For this reason, the plasma arc torch 23 positioned above the workpiece copying guide 24 by the interval H ₁ is spaced apart from the workpiece W by the interval H _1.
The cutting process is performed while the height is maintained.

By the way, although the state slightly varies depending on the arrangement interval of the work supporting blades on the work table and the width and length of the material W to be cut, the material W to be cut during the plasma processing is usually above the work supporting blade. It will be in a deformed state.
That is, the guide member 2 that guides the elevating member 3 in the vertical direction.
In a position spaced X ₁ direction relative, the workpiece scanning guide 24 abuts against the workpiece W to be deformed up and down.

As described above, a force against the weight of each part mounted on the elevating member 3 and the weight of the elevating member 3 acts on the contact point between the workpiece copying guide 24 and the workpiece W,
The workpiece copying guide 24 and the elevating member 3 are moved up and down along the workpiece W.

That is, since the elevating member 3 is guided while a rotational moment force acts on the guide member 2, in order for the guide member 2 and the elevating member 3 to slide smoothly, for example, a notch groove is formed. It is preferable to employ a sliding mechanism that combines the provided guide rail and a large number of ball bearing units that come into contact with the guide rail while rolling.

If, for example, a spring member 7 for urging the elevating member 3 upward is interposed between the substrate 1 and the elevating member 3, the weight of each part mounted on the elevating member 3 and the elevating By offsetting a part or most of the weight of the member 3 by the spring member 7, the workpiece copying guide 24
In addition, the elevating member 3 is smoothly moved up and down.

Of course, when the work copying guide 24 moves upward, a relatively small rotational moment force offset by the spring member 7 acts on the guide member 2.
As a result, the guide member 2 can be made small and inexpensive.

As described above, the plasma arc torch 23 cuts the workpiece W by the workpiece copying guide 24 while maintaining the desired cutting height H _1. After the cutting, the cylinder rod 401 is moved. The air cylinder 4 is driven to be retracted, and the workpiece copying guide 2
4 and the plasma arc torch 23 are positioned at the upper retreat position, and the plasma cutting operation is completed.

<Usage Example 2> Next, when the material W to be cut is relatively small in cutting, for example, when the plate thickness is 4.5 to 4.5.
The case of about 6.0 mm will be described.

6 to 8, the workpiece W is placed on the work table with the air cylinders 4 and 12 being driven so that the cylinder rods 401 and 121 are retracted. The air cylinder 4 is driven so as to protrude.

As a result, the elevating member 3 descends, and the workpiece copying guide 24 comes into contact with the surface of the workpiece W. In this state, the step 601 of the adjusting rod 6 for the elevating member is rotated so as to be displaced upward by a predetermined amount. As a result, the lower end surface of the second hole 302 formed in the elevating member 3
While in contact with the first upper surface, the lift member 3 is positioned displaced upwardly, the workpiece scanning guide 24 lower spacing H ₃ from the surface of the workpiece W in the example 0.3~0.4mm position upper position Is set to

In this case, of course, the lower end surface of the first hole 301 formed in the elevating member 3 and the flange 50
Gap between the second upper surface, at a greater status than in Use Example 1, while the lower end of the workpiece scanning guide 24 is positioned above by a distance H ₃ from the surface of the workpiece W, the lift member 3 and the workpiece copying Guide 24 can be displaced upwards freely,
They are arranged in a so-called floating state.

In this state, or before or after this state, the adjusting rod 19 is appropriately operated, and the lower end of the plasma arc torch 23 is moved from the surface of the workpiece W, for example, from the relation between the pointer and the scale plate. position of the adjusting piece 21 is set so that the distance H ₁ upper position.

When the air cylinder 12 is driven so that the cylinder rod 121 projects in a state where the position of the adjustment piece 21 is set as described above, the contact piece 22 fixed to the torch mounting member 8 is moved to the adjustment piece. 21 to abut the lower end and the surface and the distance H ₁ of workpiece W of the plasma arc torch 23, the torch 23 is positioned so cutting the height H ₁ position.

That is, the position of the lowering end of the torch mounting member 8 with respect to the elevating member 3 is set by the lower vertical adjustment mechanism 18.

In this state or before or after this state, the adjusting rod 15 and the lock nut 16 are appropriately rotated, and the distance between the tip of the adjusting rod 15 and the upper surface of the torch mounting member 8 becomes H. It is set to be _2.

That is, the amount of elevation H ₂ of the torch mounting member 8 is set by the upper and lower adjustment mechanism 14.

Therefore, when the air cylinder 12 is driven so that the cylinder rod 121 is retracted, the upper surface of the torch mounting member 8 comes into contact with the adjusting rod 15, and as a result, the lower end of the plasma arc torch 23 and the surface of the workpiece W are cut. The plasma arc torch 23 is positioned at a position where the distance H ₁ + H ₂ , the so-called piercing height; H ₁ + H ₂ .

As described above, the piercing process is performed by the plasma arc with the air cylinder 4 driven so that the cylinder rod 401 projects and the air cylinder 12 driven so that the cylinder rod 121 is retracted.

Of course, as described in the usage example 1, it is preferable that the workpiece W and the plasma arc torch 23 be relatively moved during the piercing so that the plasma arc torch 23 is displaced horizontally.

Further, in order to cut immediately after the piercing, the plasma arc torch 2 is gradually cut from the start of the piercing as the surface of the workpiece W is gradually cut.
The cylinder 12 is driven at a low speed so that 3 moves down.

As described above, when the through hole is formed in the workpiece W, the contact piece 22 is brought into contact with the adjustment piece 21 around the same time. While this state is maintained, that is, while the plasma arc torch 23 is positioned so as to have the above-described cutting height H ₁ , the cutting is performed while the plasma arc torch 23 and the workpiece W are relatively moved in the horizontal direction. Processing is performed.

By the way, as the cutting operation progresses, the surface of the workpiece W is deformed. In this case, since the plate thickness of the workpiece W is somewhat larger than the plate thickness targeted in the usage example 1, the surface of the workpiece W is not significantly deformed.

However, when the workpiece W is deformed upward by H ₃ or more with respect to the initial state, the workpiece copying guide 24 comes into contact with the surface of the workpiece W. Of course, as described above, since the elevating member 3 and the workpiece scanning guide 24 is positioned displaced freely positioned upward, the surface condition of the workpiece W is deformed upward H ₃ or more to the initial state, the workpiece The copying guide 24 contacts the workpiece W, and the workpiece copying guide 24 and the plasma arc torch 23 follow upward.

That is, when the surface state of the workpiece W is deformed upward from the initial state beyond the interval H ₃ , the cutting is performed with the cutting height being H ₁ -H ₃ .

Of course, it is preferable that the cutting height of the plasma arc torch in the plasma cutting be constant. However, the surface of the material to be cut is deformed in this way because the plasma arc heat is transmitted to the material to be cut W, In the case where the vicinity of the cut point is heated up, and in the case where the vicinity of the cut point is heated up as described above, even if the cutting height is slightly varied, the cutting result is hardly affected. Is the current situation.

For this reason, the allowable variation H ₃ of the cutting height is grasped in advance, and the height of the elevating member is adjusted so that the distance between the surface of the workpiece W and the lower end of the workpiece copying guide 24 becomes H ₃ . by setting the vertical position of the adjustment rod 6, the cutting height of the initial state of the plasma cutting which affects the quality of the plasma cutting is kept at H _1, also little effect on the cutting result the cutting height slightly vary no, that even under circumstances where near the cut point is Hyperthermia, that irrespective cutting height of the surface variations of the workpiece W is cut between the _{H 1 ~ (H 1 -H 3} ) it can. Therefore, a substantially uniform cutting result can be obtained.

Of course, the workpiece copying guide 24 and the workpiece W will not come into contact with each other until the surface state of the workpiece W is deformed upward from the initial state so as to have an interval H ₃ . The contact ratio of the workpiece copying guide 24 to the workpiece W is reduced, and the workpiece copying guide 24 can be used over time.

<Usage Example 3> Next, when the surface of the workpiece W is not deformed even when the plasma arc heat is conducted to the workpiece during cutting, for example, a relatively thick plate having a thickness of about 9 to 16 mm is used. The case will be described.

6, 9 and 10, the work copying guide 24 is removed from the lifting member 3 while the respective air cylinders 4 and 12 are driven so that the cylinder rods 401 and 121 are retracted.

In this state, or before or after this state, the step portion 601 of the adjusting rod 6 for the elevating member is rotated so as to be displaced upward. Note that the distance H ₄ between the base material 1 and the step portion 601 in FIG. 9 is determined by the setting state of the adjustment piece 21 of the lower vertical adjustment mechanism 18, the inherent dimensions of the apparatus such as the plasma arc torch 23, Sa H ₁
However, assuming that the adjustment state of the lower vertical adjustment mechanism 18 is undecided, the position of the step portion 601 is set to be a sufficiently high position in anticipation of the stroke allowance of the air cylinder 12. deep.

In this state, or before or after this state, the workpiece W is placed on the work table, and thereafter the air cylinder 4 is driven so that the cylinder rod 401 projects. In this case, when the elevating member 3 the tip fitting 5 which is locked in the Z ₂ direction is moved in the Z ₁ direction, the second hole lift member 3 is lowered by its own weight, which is formed in the lift member 3 The lower end surface of 302 is in contact with the upper surface of the step portion 601, and the elevating member 3 is positioned in the vertical direction.

Thereafter, when the air cylinder 12 is driven so that the cylinder rod 121 projects, the contact piece 22 fixed to the torch mounting member 8 comes into contact with the adjustment piece 21 of the lower vertical adjustment mechanism 18. Is maintained.

In this state, the stepped portion 60 of the adjusting member 6
When the rotating operation is performed so that 1 is displaced downward, the elevating member 3 on which the plasma arc torch 23 and the like are mounted is lowered together with the positional displacement of the step portion 601. Thus, by rotating operation of the elevating member for adjusting rod 6, it is adjusted to the vertical position of the stepped portion 601, so that the surface of the lower end and workpiece W in the plasma arc torch 23 is the distance H ₁ Is set to

That is, in this case, the setting position of the adjustment piece 21 in the lower vertical adjustment mechanism 18 does not matter, and can be set to an appropriate position.

After that, the upper and lower adjustment mechanism 14
In other words, the adjusting rod 15 and the lock nut 16 are appropriately rotated, and the tip of the adjusting rod 15 and the torch mounting member 8 are moved.
Distance between the upper surface of the is set to be H _2.

Next, when the air cylinder 12 is driven so that the cylinder rod 121 is retracted, the plasma arc torch 23 is positioned at a position where the upper surface of the torch mounting member 8 is in contact with the adjusting rod 15. In this case, the plasma arc torch 23 is positioned at a position where the lower end of the plasma arc torch 23 and the surface of the workpiece W have a distance of H ₁ + H ₂ , so-called piercing height; H ₁ + H ₂ .

As described above, the piercing process is performed by the plasma arc with the air cylinder 4 driven so that the cylinder rod 401 projects and the air cylinder 12 driven so that the cylinder rod 121 is retracted.

Of course, as described above, the torch mounting member 8
Abuts on the adjusting rod 15 and the plasma arc torch 23
The piercing is started while being positioned at a position of so-called piercing height; H ₁ + H ₂ .

As described in the usage example 1, it is preferable that the workpiece W and the plasma arc torch 23 are relatively moved during the piercing so that the plasma arc torch 23 is displaced horizontally.

Further, in order to cut immediately after the piercing, the plasma arc torch 2 is gradually cut from the start of the piercing as the surface of the workpiece W is gradually cut.
The cylinder 12 is driven at a low speed so that 3 moves down.

As described above, when the through-hole is formed in the workpiece W, the contact piece 22 comes into contact with the adjustment piece 21 immediately before and after the through-hole is formed. While this state is maintained, that is, while the plasma arc torch 23 is positioned so as to have the above-described cutting height H ₁ , the cutting is performed while the plasma arc torch 23 and the workpiece W are relatively moved in the horizontal direction. Processing is performed.

In the above, in the case of a relatively thick plate having a thickness of about 9 to 16 mm, the surface of the material W to be cut hardly deforms even if the plasma arc heat generated by cutting is transmitted to the material to be cut. . Thus, cutting with the cutting height H ₁ is made from the start to the end of cutting.

By the way, as described above, the workpiece copying guide 2
4 is removed from the elevating member 3, and there is no part that blocks the view near the plasma arc torch 23.
Observation of the plasma processing state can be easily performed.

In the above description, the lower up-and-down adjusting mechanism 18 is provided with the adjusting rod 19 which is rotated and adjusted in the horizontal direction.
Adjustment piece 21 whose position is adjusted in the horizontal direction by this adjustment rod
The vertical adjustment allowance can be finely set. For this reason, if the upper and lower adjustment mechanism 14 has the same configuration as the lower and upper adjustment mechanism 18, fine vertical adjustment can be performed.

Of course, regardless of this, the lower vertical adjustment mechanism 18 can have the same configuration as the upper vertical adjustment mechanism 14.

Further, if the elevating member 3 and the torch mounting member 8 are driven by the air cylinders 4 and 12, respectively,
Each lifting mechanism is simple and can be raised and lowered quickly. Of course, these air cylinders 4 and 12 can be hydraulic cylinders, for example hydraulic cylinders.

Further, the drive mechanism 11 of the torch mounting member 8 is constituted by a rotary screw shaft, a nut member screwed to the screw shaft, and a hydraulic or electric rotary drive for rotating the screw shaft. Can be configured.

[0089]

As is apparent from the above description, the torch position adjusting device of the automatic plasma cutting machine according to the first aspect of the present invention is restrained by the guide member provided on the base material and is movable vertically. A lifting / lowering member, a fluid pressure-operated cylinder in which a cylinder rod is vertically movable with respect to the lifting / lowering member, and lifts the lifting / lowering member against gravity when the cylinder rod is retracted; An adjusting rod for a lifting member which is mounted and capable of regulating a lowering position of the lifting member, a torch mounting member mounted on the lifting member and supported movably in the vertical direction, and a drive mechanism for moving the torch mounting member up and down An upper and lower upper / lower adjustment mechanism which is disposed above and below the torch mounting member and abuts on the torch mounting member to be moved up and down so that the vertical position of the torch mounting member can be freely set; A plasma arc torch attached to the attached member, and a workpiece copying guide attached to the lower part of the elevating member and protruding toward the workpiece from the tip of the plasma arc torch. The piercing height and cutting height of the plasma arc torch can be freely set by the adjustment mechanism, and the adjusting rod for the elevating member, which can regulate the lowering position of the elevating member, is adjusted to the retracted position sufficiently below. By doing
Even if the surface condition of the workpiece changes, the height of the plasma arc torch is maintained in a desired state by following the change in the surface condition by the work copying guide. Therefore, even with a very thin workpiece, desired plasma processing can be performed at a desired piercing height and cutting height.

Further, by adjusting the vertical position of the adjusting rod for the elevating member so that the descending position of the elevating member is at a desired position, the surface of the material to be cut and the lower end of the workpiece copying guide can be adjusted at the beginning of plasma cutting. interval can be set to a desired value H _3, during plasma cutting when the surface of the workpiece is deformed beyond the above value H ₃ is the work copying guide the change in the surface state Following this, the height of the plasma arc torch is maintained at H ₁ −H ₃ with respect to the initial value H ₁ , and a substantially uniform plasma cutting result can be obtained. Of course, in plasma cutting, until the surface changes in the material to be cut is the above values H _3, workpiece copying guide without coming into contact with the workpiece, the contact ratio with respect to the cutting object work copying guide decreases Therefore, the work copying guide can be used over time.

The second invention is the first invention,
Because a spring member for urging the elevating member upward is interposed between the base material and the elevating member, a part or most of the weight of each part mounted on the elevating member and the own weight of the elevating member is reduced. By offsetting by the spring member, the work copying guide and the elevating member are smoothly moved up and down. Of course, when the workpiece copying guide moves up, the relatively small rotational moment force offset by the spring member acts on the guide member, and as a result, the guide member can be manufactured small and inexpensively. .

According to a third aspect of the present invention, in the first or second aspect, the work copying guide is detachably attached to the elevating member. Even when the arc heat is conducted to the material to be cut, the surface of the material to be cut is not deformed. In this case, since the workpiece copying guide is detached from the elevating member, and there is no component that blocks the field of view near the plasma arc torch, it is possible to easily observe the plasma processing state.

In short, according to the present invention, the height of the plasma arc torch can be easily set in accordance with the plate thickness of the material to be cut, as compared with the conventional optical sensor type device.
It is possible to realize a torch position adjusting device of an automatic plasma cutting machine which is inexpensive and can cut even a thin plate uniformly.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention.

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a rear view of FIG. 1;

FIG. 4 is a plan view of FIG. 1;

FIG. 5 is a sectional view taken along line VV in FIG.

6 is a sectional view taken along the line VI-VI in FIG.

FIG. 7 is a partial cross-sectional front view for explaining <Usage Example 2> of FIG. 1;

FIG. 8 is a rear view of FIG. 7;

FIG. 9 is a partial cross-sectional front view for explaining <Usage Example 3> of FIG. 1;

FIG. 10 is a rear view of FIG. 9;

FIG. 11 is a front view showing a conventional example.

FIG. 12 is a left side view of FIG. 11;

13 is a sectional view taken along line XIII-XIII in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Guide member for elevating member 3 Elevating member 4 Fluid pressure working cylinder 6 Adjusting rod for elevating member 7 Spring member elastically provided between base material 1 and elevating member 3 8 Torch mounting member 9 For torch mounting member Guide member 11 Drive mechanism for moving the torch mounting member 8 up and down 14 Upper and lower adjustment mechanism for the torch mounting member 18 Lower vertical adjustment mechanism for the torch mounting member 23 Plasma arc torch 24 Work copying guide

Continuation of the front page (72) Inventor Toshihiko Okada 2-1-1-11 Tagawa, Yodogawa-ku, Osaka City Daihen Corporation

Claims (4)

[Claims] 1. A torch position adjusting device for an automatic plasma cutting machine, wherein an elevating member restrained by a guide member provided on a base material and movable in a vertical direction, and a cylinder rod movable up and down with respect to the elevating member. A fluid-operated cylinder that lifts the elevating member against gravity when the cylinder rod is retracted, and an elevating member that is screwed to the base member so that the up-and-down position of the elevating member can be adjusted so that the lowering position of the elevating member can be regulated. An adjusting rod, a torch mounting member mounted on the elevating member and supported movably in the vertical direction, a driving mechanism for moving the torch mounting member up and down, and disposed above and below the torch mounting member to be moved up and down Upper and lower vertical adjustment mechanisms that allow the vertical position of the torch mounting member to be set by contacting the torch mounting member, and a plasma arc torch mounted on the torch mounting member A torch position adjusting device for an automatic plasma cutting machine, comprising: a work copying guide attached to a lower portion of a lifting member and protruding from a tip of a plasma arc torch toward a workpiece. 2. The torch position adjusting device for an automatic plasma cutting machine according to claim 1, wherein a spring member for urging the lifting member upward is interposed between the base member and the lifting member. 3. The torch position adjusting device for an automatic plasma cutting machine according to claim 1, wherein the workpiece copying guide is detachably attached to the elevating member. 4. The torch position adjusting device for an automatic plasma cutting machine according to claim 1, wherein the driving mechanism uses a hydraulic cylinder.