JPS634594Y2 - - Google Patents

Description

[Detailed description of the invention] The invention is a device for cutting and polishing large spherical bodies such as balls for large valves.
In particular, the present invention relates to a polishing process that can be easily and efficiently performed.

When cutting and polishing large spherical materials such as the balls used in large ball valves, conventionally the material was rotatably held on a lathe, cut with a single tool on a rotating tool post, and then polished. At first, the cut material was transferred to another machine and polished using a grinding wheel. With this method, it is difficult to increase the size of the machine for both cutting and polishing.
There are problems in terms of high power consumption, low machining accuracy and low efficiency, and it is particularly unsuitable for cutting and polishing balls for large valves with a diameter of 500 to 3000 mm. In order to solve these problems, the present applicant has proposed a new cutting and polishing apparatus for large spherical bodies, as disclosed in Jitsugyo No. 19278/1983.

As shown schematically in FIG. 1, this device has a spherical shape formed by rotatable rotating shafts 5 and 6 in a driving head 3 and a driven head 4, both of which are slidably installed opposite each other at symmetrical positions on a fixed base 2. Holding the center axis of the body 1, the rotating shaft 5, the spherical body 1, and the driven shaft 6 rotate together through the motor 13, the transmission mechanism 14, and the drive shaft 15, thereby rotating the spherical body 1. The surface is cut and polished by the cutting tool 11 of the cutting head 9 and the polishing tool 12 of the polishing head 10, which are installed opposite to each other at symmetrical positions of the rotary table 8, which is rotatably provided on the fixed base 2. The rotary table 8 rotates during cutting and polishing of the spherical surface through a transmission 16, a transmission mechanism 17, a reduction gear 18, and a drive shaft 19. It is designed so that it will be done. According to this method, all operations from rough cutting to finish cutting and polishing of the outer diameter of the spherical body can be performed on the same machine.
Although it has the characteristics of being able to perform cutting and polishing of large spherical bodies with high precision and high performance, and very easily cutting and polishing large spherical bodies, there are new problems in the following points. That is, such large spherical bodies are generally used as large ball valves, and when used in combination with such applications, the surface roughness of the spherical bodies is an extremely important requirement. When the ball is installed in the valve housing as a ball valve, the annular seat provided in the housing comes into contact with the ball surface when the fluid passage is closed, preventing the handled fluid from leaking from upstream to downstream. Therefore, the precision of the surface roughness has a significant effect on the amount of leakage, and therefore, in order to minimize the amount of leakage, it is required that the ball surface has a finish close to a mirror surface. It will be done. For polishing to obtain such surface roughness, the required processing time is too long if only a polishing wheel is used, and a combination of a polishing wheel and a polishing buff is required. In the cutting and polishing apparatus shown in FIG. 1 which was previously proposed by the present applicant, the polishing head 10 on the rotating table 8 has only one main shaft to which the polishing tool 12 is attached, and the polishing tool 12 is attached to the polishing head 10 on the rotating table 8. When using a grinding wheel and a polishing buff together, it is inevitable to use the grindstone and the buff interchangeably. That is, according to the cutting and polishing apparatus, as a cutting and polishing procedure for the spherical body 1, the surface of the spherical body 1 is first roughly cut by the cutting head 9, and after the surface is inspected, a finishing process is performed, and the surface is inspected again. After that, first rough cutting is performed using the polishing whetstone attached to the polishing head 10, then the polishing whetstone is removed using a hoist, and a replacement work is performed by attaching a polishing buff, and then buffing and finishing grinding is performed using the polishing buff. Then, a mirror-like finishing process is performed, and the buff and grindstone are replaced again using the hoist to complete one cycle. A hoist is required to replace the grindstone and buff, and several tens of minutes of work time is required by multiple workers, which poses problems in terms of safety and waiting time for the hoist. .

The present invention was made in order to solve the new problems that arise in cutting and polishing equipment as described above.For this reason, in the present invention, the polishing head installed on the rotating table is attached to the surface of the spherical body. Rotate it 180 degrees so that both the front and back sides can be freely contacted.
By installing a polishing wheel and a polishing buff on both the front and rear surfaces, with their own dedicated shafts, it is possible to switch between the grindstone and buff with a one-touch operation. , a rotating table that is rotatable on the fixed table to move the surface of the spherical body to be processed, the axial center position of which is held between the driving and driven heads that are rotatably provided on the fixed table at opposing positions; In an apparatus for cutting and polishing using a cutting head and a polishing head disposed at opposite positions, the polishing head is provided so as to be freely reversible back and forth toward the surface of the spherical body, and the polishing head is provided so as to be freely reversible back and forth toward the surface of the spherical body, and the polishing head is provided so as to be reversible back and forth with respect to the center of reversal at left and right distributed positions. A disc-shaped polishing whetstone and a disc-shaped polishing buff are separately provided, and a rotation axis centered on the polishing whetstone and a rotation axis centered on the polishing buff are arranged with their axes at the same height and parallel to each other. , located at a point symmetrical to the center of inversion.

The present invention will be described in detail below based on the illustrated embodiment. In FIG. 2, a cutting head 22 is located on the left side of the figure at a symmetrical position of a rotating table 21 that is rotatably provided on a fixed base 20. Further, on the right side in the figure, polishing heads 23 are installed so as to move along with the rotational movement of the rotation table 21, and to face the surface of the spherical body 1 independently so as to be able to slide back and forth. Needless to say, the fixed table 20, the rotating table 21, the cutting head 22, and the polishing head 23 correspond to the fixed table 2, the rotating table 8, the cutting head 9, and the polishing head 10, respectively, in the cutting and polishing apparatus shown in FIG. Although not shown in the drawings, the spherical body 1 is attached to the rotating shafts 5 and 5 of the driving head 3 and the driven head 4, which are disposed vertically forward and backward in the direction of the drawing on the fixed base 20.
It is also the same as that shown in FIG.

In the present invention, the polishing head 23 is provided with a third polishing head.
The structure shown in the embodiments shown in FIGS. 7 to 7 is newly added. That is, as shown in FIGS. 3 and 4, the polishing head 23 is connected to the rotating table 2.
180 via a pivot shaft 43 on a pivot gear box 42 provided integrally with a slide 41 mounted on a reciprocating table 40 fixedly attached to a slide 41 so as to be slidable toward the spherical body 1.
The head 23 is rotatably supported.
There is a disc-shaped polishing wheel 2 on the front side facing the spherical body 1.
6 is rotatably provided via a dedicated rotation shaft 27,
On the opposite rear side, a disc-shaped polishing buff 28 is similarly provided rotatably via a dedicated rotating shaft 29. At this time, the dedicated rotating shafts 27 and 29 are arranged with parallel axes at the same height, and
It is arranged at a point symmetrical position with respect to the rotation center of the rotation shaft 43. Further, as shown in FIG. 4, the polishing whetstone 26 and the polishing buff 28 are arranged in a distributed manner on the left and right sides of the pivot shaft 43, and as shown in FIG. has been done. Here is the polishing whetstone 26 and polishing buff 2
8 is set at a so-called diagonal position of the polishing head 23. In order to rotate the pivot shaft 43 by 180 degrees, a worm wheel 37 is attached to the pivot shaft 43 in the pivot gear box 42, as illustrated in FIG. 5, which shows a cross section taken along line A-A in FIG. The worm gear 36 provided on the worm shaft 44 installed in the box 42 is engaged with the worm gear 36, and the hydraulic motor 35 connected to the worm shaft 44 is driven by the hydraulic device 39 illustrated in FIG. By controlling the solenoid valve 34, the polishing head 23 is rotated 180 degrees by forward and reverse rotation, and the polishing head 23 is rotated with one touch as shown in FIG.
6 to face the spherical body 1 side, or the polishing buff 28 to face the spherical body 1 side. Furthermore, in order to rotate the dedicated rotating shafts 27 and 29 of each grindstone 26 and buff 28, as illustrated in FIG. 7, which is a cross section taken along line B-B in FIG.
Using the drive motor 30 built in, the motor 30
A drive pulley 46 equipped with an electromagnetic clutch 32 at both ends of the output shaft 45 of the gearbox 31 connected to the
A pair of driven pulleys 47 and 48 on the dedicated rotating shafts 27 and 29 are connected to belts 49 and 50, respectively.
By connecting either the rotating shaft 27 or the rotating shaft 29, the polishing wheel 26 or the polishing buff 28 is selectively rotated.
In order to selectively operate only one of these, the sixth
The limit switch 38 and the electromagnetic clutch 32 illustrated in the figure are used, and an appropriate interlock mechanism or switching control means is used to prevent simultaneous rotation of two axes by electric signals. The limit switch 38 is also used to rotate the polishing head 23 through 180 degrees and to stop it. Furthermore, in order to stop idling when stopped, electromagnetic brakes 33, 33 are connected to drive pulleys 46, 46 sides of the gearbox 31, respectively, as illustrated in FIG. Although not shown, a hydraulic system may be built into the polishing head 23 and operated from the operation panel 24 to cause the head 23 to float slightly. This allows the polishing head 23 to float slightly before rotating it 180 degrees.
After confirming this, the head is rotated 180 degrees, and after confirming the 180 degree rotation, the floating amount is returned to its original value and the head is clamped in that position.It can be installed as required. In addition, in FIG. 2, 51 indicates a grinding fluid nozzle attached to the head 23, and 25 indicates a joint for connecting a pipe in the grinding fluid nozzle 51, and this joint 25 portion is detachable.
When turning 180 degrees, it will be removed and reconnected after the turn. Reference numeral 52 designates a cutting tool such as a multi-blade face milling cutter in the cutting head 22. In addition, the polishing head 23 has a movement function for turning the polishing head 23 forward and backward 180 degrees, and the polishing wheel 2
The rotation mechanism for the 6-polishing buff 28 is not limited to the illustrated example.

According to the device of the present invention, during the polishing process after the finish cutting of the spherical body 1 by the cutting head 22 is completed, the polishing wheel 26 in the polishing head 23, which has been retreated, is removed, as can be easily seen from the structure of the embodiment.
is brought into contact with the cutting surface of the spherical body 1 as the head 23 advances, and after grinding with the grindstone 26,
It is easily possible to rotate the polishing head 23 180 degrees, bring the polishing buff 28 into contact with the surface to be ground, and continue final polishing with the buff 28 with a single touch operation. The time and work of replacing the whetstone or buff on the rotating shaft of the whetstone 26 and buff 28 are completely eliminated.
By using this together, mirror-like precision polishing can be performed in a straight and continuous manner. Therefore, worker 1
Preparation work can be done with just a few seconds, there is no need to worry about safety due to hoist work, precision polishing can be achieved in a short time, and balls for ball valves with excellent sealing performance can be produced with high precision. can. From a time point of view, there are major advantages in terms of labor savings and efficiency due to the reduction in work time and the reduction in the number of times the polishing wheel is dressed. Furthermore, a disc-shaped polishing whetstone 26 and a disc-shaped polishing buff 28 are separately provided in front and behind each other at left and right distribution positions with respect to the inversion center of the polishing head 23, and a rotating shaft 27 centered on the polishing whetstone 26 and a disc-shaped polishing buff 28 centered on the polishing whetstone 26. The rotating shafts 29 are arranged with parallel axes at the same height, and are arranged point-symmetrically with respect to the center of inversion.
The polishing wheel 26 and the polishing buff 28 can be arranged in an overlapping manner, and the polishing head 23
can be configured compactly. Furthermore, the polishing whetstone 26
Since the rotating shafts 27 and 29 of the polishing buff 28 and the polishing buff 28 are at the same height and have parallel axes, final polishing can be continued by simply reversing the polishing without separately adjusting the height. . As mentioned above, the holding rotation of the spherical body by the active and driven heads, the cutting head,
This invention is of great benefit as it solves the problems in cutting and polishing equipment of the type that performs cutting and polishing using a polishing head, and aims to improve its functionality and workability.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional large spherical object cutting and polishing means, Fig. 2 is a side view of the main part of an embodiment of the device of the present invention, Fig. 3 is a side view of the same grinding head, and Fig. 4 is a side cross-section of the main part. 5 is a cross-sectional view taken along the line A--A in FIG. 4, FIG. 6 is a side view of the same, and FIG. 7 is a cross-sectional view taken along the line B--B in FIG. 3. DESCRIPTION OF SYMBOLS 1... Spherical body, 20... Fixed table, 21... Turning table, 22... Cutting head, 23... Polishing head, 26... Polishing wheel, 27... Rotating shaft, 2
8... Polishing buff, 29... Rotating shaft, 43... Rotating shaft.

Claims (1)

[Scope of utility model registration request] The surface of the spherical body to be processed, whose axial center position is held between the driving and driven heads, which are rotatably arranged opposite to each other on the fixed table, is moved to the rotating table, which is provided so as to be rotatable on the fixed table. In an apparatus for cutting and polishing using a cutting head and a polishing head arranged at opposing positions, the polishing head is provided so as to be freely reversible back and forth toward the surface of the spherical body, and disks are rotated back and forth from each other at left and right distribution positions with respect to the center of reversal. A polishing whetstone in the shape of a shape and a polishing buff in the shape of a disc are separately provided, and a rotation axis centered on the polishing whetstone and a rotation axis centered on the polishing buff are disposed with axes that are at the same height and parallel to each other, A cutting and polishing device for a large spherical body, characterized in that the device is arranged point-symmetrically with respect to the center of inversion.