JPH0976059A - Roundness working device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily execute roughness working without piercing a center hole by inserting/supporting a holder to mount a working means to a rotating table arranged to a base through a bearing mechanism. SOLUTION: A working means is mounted at the side of a rotating table 11 which rotates against a base 9 through a bearing mechanism, through a holder 5, the working means is rotated with drawing roundness when the rotating table 11 rotates. At the time of drawing a roundness on a work W, roundness working of cutting, etc., is executed. A radius of working is changed by adjusting a position of the holder 5 with a moving arm 3. An index 15 for indicating the center is mounted to the rotating table 11, its tip can be aligned at the rotating center so as to confirm the center of circle to be worked. Thus, roundness working is easily executed without piercing a center hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perfect circle processing apparatus suitable for cutting into a circular shape by using a plasma discharge type cutting machine, a gas cutting machine or the like, or performing welding or other processing in a circular shape.

[0002]

2. Description of the Related Art A tool as shown in FIG. 9 is used when a plasma cutter, a gas cutter, or the like is used to cut into a perfect circle. That is, the slide arm 3 is passed through the housing 2 to which the center pin 1 is fixed and the butterfly bolt 4
The torch portion 6 of the plasma cutting device is inserted through the insulator collar K into the cylindrical holder 5 fixed to the arm tip.

In use, a punch is formed in the center position with a punch, and the tip of the center pin 1 is inserted into the depression, and then the gap between the tip of the torch portion 6 and the work W is 0.5.
While keeping the thickness at about 1.0 mm, the switch button 7 is pushed to turn on the power, and the slide arm 3 is held in the hand and rotated. When the center pin 1 is rotated once around the center, it can be cut into a perfect circle having a radius R.

[0004]

However, a fatal defect of the compass type perfect circle cutting device is that the disk portion 8 having the radius R is always loaded with the tool through the center pin 1. Therefore, at the time of the final cutting, not the cutting by the cutting device but the bending gradually due to the load.

Therefore, in the case of an article which requires post-finishing after cutting and requires high accuracy, even if the post-finishing is performed, it may not be usable. Also, before beginning to bend as described above,
The cutting operation may be temporarily stopped, the torch portion 6 may be removed from the holder 5, and the torch portion 6 may be held by hand to cut and separate the connecting portion. However, since the cutting is not a compass type but a true circular cutting by manual operation, the final cutting portion does not become a perfect circle, and there are cases in which restoration is impossible. Therefore, there is a drawback that the application is limited.

In the plasma cutter, the gap between the tip of the torch portion 6 and the work W must be maintained at about 0.5 to 1.0 mm at all times, but while manually rotating the compass type as shown in FIG. Keeping the gap constant requires skill in operation and is therefore not suitable for mass production.

In addition, it is necessary to always punch a center hole, which cannot be applied to a product in which the disk portion 8 is inconvenient if the center hole or the like is damaged.

[0008] The technical problem of the present invention is to pay attention to such a problem, to prevent the disc portion from being subjected to a load to prevent defective cutting, and moreover, even an unprofessional can easily make a perfect circle and to form a center hole. It is to realize a perfect circle processing device that does not need to be opened.

[0009]

[Means for Solving the Problems] These problems can be solved by the following means. According to a first aspect of the present invention, there is provided a perfect circle machining device having a structure in which a rotary table is provided on a base via a bearing mechanism, and a holder for mounting a machining means is inserted and supported on the rotary table side.

According to a second aspect of the present invention, a rotary table is provided on the base via a bearing mechanism, and a window hole is formed in the rotary table inside the bearing mechanism to form an annular rotary table. Attach a movable arm to
This is a perfect circle processing device in which a holder for supporting a processing means is attached to the movable arm.

According to a third aspect of the present invention, there is provided a perfect circle machining device in which a pointer for indicating a center is attached to the annular portion of the rotary table according to the second aspect, and the tip of the pointer can be aligned with the center of rotation.

[0012]

According to the present invention, since the processing means can be attached via the holder to the rotary table side which rotates with respect to the base through the bearing mechanism, when the rotary table rotates, the processing means also rotates. Then draw a perfect circle. Therefore, if a work is set at a place other than the rotary table and a perfect circle is drawn on the work, perfect circle machining such as cutting can be performed. The cutting radius depends on the installation position of the holder.

According to a second aspect of the present invention, since the rotary table is formed in a ring shape by forming a window hole inside the bearing mechanism, when the work is set inside the bearing mechanism, the work can be visually confirmed. The workability is good because the work can be easily taken in and out.

Further, since the movable arm for supporting the processing means via the holder is attached to the annular portion of the rotary table, the work is placed inside the bearing mechanism by adjusting the position of the holder by the movable arm. Alternatively, it can be set on the outside to machine a perfect circle of any diameter.

According to a third aspect of the present invention, since the pointer for center indication is attached to the rotary table according to the second aspect and the tip of the pointer can be aligned with the center of rotation, processing is performed according to the position of the tip of the pointer. You can check the center of the power circle at a glance and set it.

According to the first to third aspects, since the machining means is supported and rotated by the rotary table, the gap between the machining means such as the torch and the work can be kept constant, and a load is applied to the machined part. Nor. Therefore, even an amateur can easily and accurately machine a perfect circle without needing to make a center hole.

[0017]

EXAMPLES Next, examples of practical application of the true circle machining apparatus according to the present invention will be described. FIG. 1 is a longitudinal sectional view of an embodiment of an apparatus for processing a small-diameter true circle according to the present invention. Reference numeral 9 denotes a base, which has a ring shape in the illustrated example, and on which a rotary table 11 is mounted via a bearing mechanism such as a ball 10.

That is, as shown in an enlarged view of the bearing mechanism portion, a perfect circular groove 12 is formed on the upper surface of the base 9, and a perfect circular groove 13 having the same diameter is formed on the lower surface of the rotary table 11. A bearing ball 10 is sandwiched in both grooves 12, 13. Three or more balls 10 are arranged at equal intervals on the entire circumference, but a large number of balls may be inserted ignoring the intervals. In the illustrated example, the diameter of the grooves 12 and 13 is 1
It is 50 mm, but is not limited to this.

A housing 14 is fixed to the rotary table 11, and a slide arm 3 penetrates through a through hole (radial direction of the rotary table 11) formed in the housing 14 and fixed by a wing bolt 4. ing. The collar K of an insulator is inserted into the cylindrical holder 5 fixed to the inner end of the slide arm 3, and the torch portion 6 of the plasma cutting device is inserted and supported therein.

FIG. 2 is a plan view of the perfect circle machining apparatus of the embodiment of FIG. 1 in which the plasma cutting device is not set, and FIG. 3 is a vertical sectional view of the same apparatus. Since the rotary table 11 is placed on the base 9 via the bearing mechanism including the ball 10 and the perfect circular grooves 12 and 13, the rotary table 11 is placed at the center position of the perfect circular grooves 12 and 13. In the center,
Can rotate.

Therefore, the torch portion 6 of the plasma cutter supported by the holder 5 can rotate at the position of the radius R. As a result, a complete circle with a radius R is cut in the work W by one rotation. Moreover, since the load does not act on the inner portion of the radius R of the work W as shown in FIG. 9, the work W is cut accurately and smoothly over the entire circumference.

When cutting with different radii, it is sufficient to loosen the wing bolt 4, move the movable arm 3 in the radial direction of the rotary table 11, and fix the wing bolt 4 at a predetermined scale position. .

A pointer 15 for indicating the center is attached to the rotary table 11, and the tip 15a of the needle 15 is
It is aligned with the center of rotation of the turntable 11. Therefore, when the center position is previously marked on the work W, when the needle tip 15a is aligned with the mark, a perfect circle having a radius R centered on the mark position is machined.

Further, in the case of a work having no center position mark, when the position of the needle tip 15a is marked on the work, the mark of the center position remains on the product cut into a perfect circle.

A ring-shaped base 9 and a ring-shaped rotary table 11 are provided to prevent dust from entering the inside of the bearing mechanism.
The outer covers 16 and 42 are fixed to the outer peripheries thereof, and the inner cover 17 is covered to the inner perimeter. Marks are placed on the inner surface of the inner cover 17 at intervals of 90 degrees, and lines are drawn between the marks facing each other on the work by scoring, so that the intersecting point becomes the center of rotation and the center of the processed product. Becomes

When the center position is marked on the work in advance, a cross line intersecting at the position of the mark is marked, and positioning is set so that the mark of the inner cover 17 is overlapped on the cross line. It is possible to process a perfect circle centered on the position of the center mark.

With the torch portion 6 of the plasma cutter inserted in the cylindrical holder 5, it is necessary to maintain the gap between the tip of the torch portion 6 and the work surface at about 0.5 to 1.0 mm. Therefore, as illustrated in FIGS. 2 and 3, the tip 3a of the movable arm 3 and the holder mounting bracket 5 are
A vertical position adjusting mechanism is provided between the position a and a.

That is, an elongated hole 5b is formed in the up-down direction in the fitting 5a fixed integrally with the holder 5 side. On the other hand, a bolt insertion hole is formed in the tip 3a of the movable arm, and the bolt 18a is inserted through the hole and the elongated hole 5b and fixed by tightening the wing nut 18b.

Therefore, after loosening the wing nut 18b and moving the holder 5 side up and down to adjust the position, the wing nut 18b
The gap can be easily adjusted by tightening b. Further, since the holder 5 side can be rotated around the bolt 18a as an axis, it is possible to cut the holder 5 into a tapered shape by inclining the holder 5.

1 to 3, the movable arm 3 is slid in the longitudinal direction and the holder 5 is moved inside the ring-shaped rotary table 11, so that the inner diameter of the rotary table 11 is smaller than that of the rotary table 11. Can process a perfect circle.

On the other hand, the embodiment shown in FIGS. 4 and 5 is an apparatus for machining a perfect circle having a diameter larger than the outer diameter of the rotary table 11. FIG. 4 is a plan view and FIG. 5 is a central sectional view thereof. In this embodiment, the movable arm 3 shown in FIGS. 1 to 3 is pulled out from the housing 14 and inserted in the opposite direction so that the holder 5 is positioned outside the rotary table 11.

Therefore, in this state, the movable arm 3 is slid in the radial direction of the rotary table 11 and fixed with the wing bolts 4, and when the rotary table 11 is rotated once, a perfect circle larger than the outer diameter of the rotary table 11 is formed. Can be processed.

In the embodiment shown in FIGS. 1 to 5, the perfect circle machining apparatus according to the present invention is placed on a large iron plate or the like for perfect circle machining. When machining a small workpiece in perfect circle, as shown in Fig. 6,
A positioning jig 19 is set inside the rotary table 11, and the jig W is used to position and set the work W before the machining is started.

In the embodiment shown in FIGS. 1 to 5, the movable arm 3 is slid in the longitudinal direction to adjust the position of the holder 5 in order to change the radius of the perfect circle machining. On the other hand, the embodiment of FIG. 7 has a structure in which the movable arm 3 rotates.

That is, the cylindrical housing 14 is inserted into the cylindrical body 20 fixed vertically to the rotary table 11, and the housing 14 can freely rotate in the cylindrical body 20. Therefore, when the movable arm 3 is rotated in the direction of the arrow to set the distance from the rotation center of the rotary table 11 to the center of the holder 5, and then the rotary table 11 is rotated once with the wing bolt 21 tightened and fixed, Can be rounded.

Since the holder 5 can be rotated to the outside of the rotary table 11, it is not necessary to remove the movable arm 3 from the housing 14 and replace it in the opposite direction as shown in FIGS.

In each of the above-described embodiments, the rotary table 11 has an annular shape, and the holder 5 is provided at the end of the arm 3 which is movable in the sliding direction or the rotating direction. It has a structure to insert parts.

On the other hand, in the embodiment of FIG. 8, the hole 22 through which the holder 5 can be inserted and supported directly on the rotary table 11 itself.
And the holes 22 are slightly different in distance from the center of rotation. Moreover, it is opened outside the bearing mechanism.

Therefore, an independent holder 5 is prepared, inserted into the hole 22 at a position corresponding to the radius to be processed, and the torch portion 6 such as a plasma cutting device is attached to the holder 5 via the insulating collar K. With the table inserted, turntable 1
A complete circle can be cut by rotating 1 once.

The rotary table 11 of this embodiment is
The minimum requirement is that it can be rotated by the bearing mechanism, and it does not necessarily have to be annular. When machining a perfect circle smaller than the inner diameter of the bearing mechanism, if there is a structure that allows the work to be automatically put in and out of the bearing mechanism with an automatic machine, there is no opening inside the bearing mechanism. It may be a plate or the like.

However, since it is more effective to visually confirm the position and state of the work, it is preferable to cut out the position indicated by the chain line to open a window hole 23 for peeping or for taking in and out the work. .

In the above embodiment, the rotary table 11
With a structure in which is rotated by a motor through a gear, a friction wheel, a belt, etc., the rotation speed of the rotary table is constant, so that more accurate machining is possible. When the rotating table is rotated manually, it is preferable to attach a handle for rotating operation.

The cutting process by the plasma cutting device has been described above as an example. However, it is also possible to attach the torch part of the gas cutting device to perform the gas cutting, and if another processing device is set, another perfect circular shape can be obtained. Processing is also possible.

[0044]

According to the first aspect of the present invention, when the rotary table rotates, the processing means such as the plasma cutter also rotates and draws a perfect circle, so that the perfect circle is processed. Moreover, since the rotary table and the processing means rotate stably, and the disk to be processed is not subjected to a load, it is possible to prevent defective cutting, and even an amateur can easily make a perfect circle. It can be processed and there is no need to open a center hole.

According to the second aspect of the present invention, since the rotary table has a window hole formed inside the bearing mechanism,
When the work is set inside the bearing mechanism, the work can be visually confirmed, the work can be easily taken in and out, and the workability is good.

Further, since the machining means is attached to the movable arm via the holder, the machining radius can be freely set by adjusting the movable arm, and the work can be set inside or outside the bearing mechanism. A perfect circle of any diameter can be processed.

According to the third aspect, since the pointer for center indication is attached to the annular rotary table and the needle tip can be aligned with the rotation center, the center of the circle to be machined can be determined depending on the position of the needle tip. You can check and set at a glance.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view illustrating a processed state of a small-diameter true circle according to the present invention.

FIG. 2 is a plan view of the perfect circle machining apparatus of the embodiment of FIG. 1 in a state in which a plasma cutting device is not set.

FIG. 3 is a vertical cross-sectional view of the true circle machining apparatus of the embodiment of FIG. 1 in a state in which a plasma cutting device is not set.

FIG. 4 is a plan view of an apparatus for processing a perfect circle larger than the outer diameter of a rotary table.

5 is a central cross-sectional view of the embodiment apparatus of FIG.

FIG. 6 is a vertical cross-sectional view of an embodiment in which a positioning jig is set inside a rotary table.

FIG. 7 is a plan view of an embodiment in which a working radius is set by rotating a movable arm.

FIG. 8 is a plan view of an embodiment in which a holder is directly inserted and supported on a rotary table itself.

FIG. 9 is a perspective view illustrating a conventional tool for a plasma cutter.

[Explanation of symbols]

 W Work 3 Movable arm 5 Holder K Color 6 Torch part 9 Base 9a Base leg 10 Ball 11 Rotary table 12 True circular groove 13 True circular groove 15 Center indicating needle 19 Jig for positioning

Claims (3)

[Claims] 1. A true circle machining apparatus having a structure in which a rotary table is provided on a base via a bearing mechanism, and a holder for mounting a machining means is inserted and supported on the rotary table side. 2. A rotary table is provided on the base through a bearing mechanism, and a window is formed in the rotary table inside the bearing mechanism to form an annular rotary table. A movable arm is provided at an annular portion of the rotary table. And a holder for supporting the processing means is attached to the movable arm. 3. The round machining device according to claim 2, wherein a pointer for indicating a center is attached to an annular portion of the rotary table, and a tip of the pointer can be aligned with a rotation center. .