JP3074144B2 - End notch apparatus and end notch method for cylindrical ceramic molded product - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device and a method for cutting an end of a cylindrical ceramic molded product which is suspended and fired in a process of manufacturing a ceramic product.

[0002]

2. Description of the Related Art Ceramic manufacturing processes, in particular drying and drying of long ceramics such as station post insulators and insulator tubes.
In the firing step, hanging and drying and firing are performed to prevent deformation due to buckling. For this purpose, a ceramic molded product is formed on a product part (51) to be a product by integrally forming a cut-off part (54) that is cut off after firing, and the cut-off part (54) supports the ceramic molded product. Then, it is made to hang. Here, in a small ceramic molded product, it is widely practiced to form a suspension hole penetrating the side surface of the cut-off portion and insert an elema rod (a suspension rod) therethrough for suspension.

However, in the case of a large ceramic molded product, not only is it difficult to manufacture an elema rod that can withstand the weight thereof, but also it is cut off from the hanging hole. I have lowered it. For this reason, as shown in FIG. 5, the cut-off portion (54) includes a continuous portion (55) continuous from the product portion (51) and a tapered portion (57) whose diameter is increased upward from the continuous portion (55). ) And a columnar large-diameter portion (59) are formed integrally therewith. On the other hand, a split frame (63) is provided on the support frame (61) on which the ceramic molded product can be hung, and the outer circumference of the tapered portion (57) is supported and hung on the split frame (63). It should be noted that the split portion (63) is formed in a divided ring shape, and has a support surface (63 a) that closely supports the outer periphery of the tapered portion (57).

However, since the support surface (63a) is formed in a wide ring shape in order to avoid stress concentration, in the drying step, the tapered portion (57) in close contact with the support surface (63a) is not dried. Sufficient or non-uniform drying will introduce internal strain. In addition, even in the firing step, uniform heat conduction is hindered. In particular, when the temperature is raised in the initial stage of firing, internal strain due to thermal stress is applied, and a crack Y is formed below the tapered portion (57) as schematically shown in FIG.
And yield decreases. Therefore, in a ceramic molded product having a cylindrical shape in the vertical axis direction, the inner surface of this cylinder is cut out in a tapered shape from the upper end surface to balance the wall thickness, and defective products due to cracks etc. The generation of ceramics is prevented by preventing the occurrence. A tapered notch from the upper end of the inner surface of the cylinder was formed using a jig provided with a plurality of blades on a conical surface as shown in FIG.

[0005]

However, according to this forming method, a large force is required to turn the jig, the degree of fatigue of the worker is extremely large, and continuous work is difficult. Also,
When the jig is turned, the ceramic molded product also rotates. Therefore, it is necessary for an operator other than the operator who rotates the jig to hold and stop the ceramic molded product. Furthermore, it was difficult to scrape it off smoothly, and rework was required. Therefore, an object of the present invention is to provide a method of manufacturing a ceramic molded product with a low degree of worker fatigue and good productivity.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a shaft and both ends of the shaft are projected at right angles to the shaft and in the same direction. A first arm for holding a wire, a second arm for holding a wire, and a wire stretched at a predetermined angle with respect to the longitudinal direction of the shaft between the distal ends of the arm for holding the wire; And an inner diameter chuck which is provided on the shaft and is held at the center of the cylindrically formed ceramic molded product. The end of the ceramic molded product is cut using a wire, and the wire is stretched at a predetermined angle so that the shape of the end cut is a predetermined size, and the arm is turned. As a result, the wire moves through the ceramic molded product, and when the handle makes one round, ceramics of a predetermined size are cut off and an end cutout is formed. Here, the tip of the arm for holding the wire may be any location on the arm where the wire can be stretched at a predetermined angle.

Here, as in the second aspect of the present invention, by providing a mechanism capable of changing the extension length of the inner diameter chuck, it is possible to cope with the notch end portions of ceramic molded products having different inner diameters. Possible and preferred. As a mechanism for changing the position of the inner diameter chuck, for example, a known mechanism such as sliding the length of an arm supporting the chuck may be appropriately selected.

According to a third aspect of the present invention, there is provided a hollow threaded rod in which a predetermined portion at one end is a right-hand thread and a predetermined portion at the other end is a left-hand thread, and a first nut screwed into the right-hand thread portion. And a second nut threadedly engaged with the left-hand thread portion. The three points between the two nuts are connected by a three-node link such that all of the connection points are rotatable. An inner diameter chuck mechanism in which a chuck plate is rotatably arranged at each connection point, a chucking handle for rotating the screw bar, a shaft inserted into a hollow portion of the screw bar, the screw bar and the shaft. A first wire holding arm and a second wire holding arm protrudingly provided on the shaft at right angles and in the same direction with respect to the shaft, respectively, on the fixing piece; Of the wire holding arm and the second wire holding arm To, the longitudinal direction of the threaded rod, a wire is stretched at a predetermined angle, it is made of. Since a threaded rod having a right-hand thread and a left-hand thread is used, turning the chucking handle and turning the threaded rod causes the inner diameter chuck to rotate until the inner diameter chuck contacts the inner peripheral surface of the tubular ceramic molded product. Can be spread outward. Therefore, the present invention can be effectively used even for cylindrical molded products having different inner diameters. The inner diameter chuck mechanism according to the third aspect includes the first nut, the second nut, three sets of three-node links, and the chuck plate as described above.

According to a fourth aspect of the invention, a predetermined portion at one end is a right-hand thread, and a predetermined portion at the other end is a left-hand thread, and a first screw threaded to the right-hand thread portion of the screw bar. And the nut
A second nut screwed into a left-hand thread portion of the threaded rod;
First, second and third pivotally connected to nuts of
Inner diameter chuck arm, fourth, fifth, and sixth inner diameter chuck arms rotatably connected to the second nut, the first inner diameter chuck arm, and the fourth inner diameter chuck A first connecting pin for rotatably connecting the first arm and the second connecting pin for rotatably connecting the second inner diameter chuck arm and the fifth inner diameter chuck arm; A third connecting pin rotatably connecting the inner diameter chuck arm and the sixth inner diameter chuck arm, a first inner diameter chuck rotatably connected to the first connecting pin, and a second inner pin. A second inner diameter chuck rotatably connected to the third connection pin, a third inner diameter chuck rotatably connected to the third connection pin, and chucking fixed to an end of the screw rod A handle, a shaft inserted into the hollow portion of the threaded rod, A fixing piece attached to both ends of the screw rod, a bearing connecting the screw bar and the shaft, and a first wire holding arm fixed to the fixing piece at right angles to the screw bar and in the same direction. And a second wire holding arm, and a wire stretched at a predetermined angle with respect to a longitudinal direction of the threaded rod between distal ends of the first wire holding arm and the second wire holding arm. It consists of

It is preferable that the inner diameter chuck arms connected to the respective nuts are arranged at equal intervals in the rotation direction of the screw rod, from the viewpoint of improving the stability of shaft positioning. Further, it is preferable that a projection is provided on the chuck surface of the inner diameter chuck. With this, the notch is finished at the same time as the role of firmly holding the ceramic molded body, and when the device is taken out, the cut-out ceramic portion can be taken out at the same time, thereby improving workability.

According to a seventh aspect of the present invention, a shaft is inserted into a hollow portion of a cylindrical ceramic molded product, and the shaft is held at the center of the cylindrical ceramic molded product by an inner diameter chuck provided on the shaft. , At both ends of the shaft, between the distal ends of a first wire holding arm and a second wire holding arm fixed at right angles to the shaft and in the same direction, respectively.
An end notch method of a cylindrical ceramic molded product in which a wire stretched at a predetermined angle with respect to the longitudinal direction of the shaft is rotated about the shaft. Claim 8
The described invention inserts a shaft into a hollow portion of a cylindrical ceramic molded product, expands an inner diameter chuck disposed on the shaft, holds the shaft at the center of the cylindrical ceramic molded product,
At both ends of the shaft, between the distal ends of a first wire holding arm and a second wire holding arm fixed at right angles to the shaft and in the same direction, a predetermined length is set with respect to the longitudinal direction of the shaft. An end notch method for a cylindrical ceramic molded product, characterized in that a wire stretched at an angle is rotated about the axis.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In each of the drawings, FIG. 1 is a perspective view showing a notch device, FIG. 2 is a perspective view of a notch device of another embodiment, and FIG. 3 is a diagram showing a notch device in the embodiment shown in FIG. FIG. 4 is a cross-sectional view of the embodiment shown in FIG.
FIG. 6 is a cross-sectional view showing a method of holding the porcelain pipe, and FIG. 6 is a cross-sectional view of the porcelain pipe cut out. First, referring to FIG. 1, an end notch device for a cylindrical ceramic molded product will be described. Three inner diameter chucks (5) were attached at intervals of 120 degrees in the circumferential direction of the shaft (2). (In FIG. 1, two inner chucks are shown because one inner chuck is behind the shaft.) At least three inner chucks are required for shaft positioning. However, three or more may be provided as appropriate. When three inner diameter chucks are provided, they are preferably arranged at intervals of 120 degrees in the circumferential direction in view of the stability of shaft positioning. As the shape of the inner diameter chuck, as shown in FIG. 1, a metal fitting having an inverted L-shaped cross section was used which was in contact with the end face and the inner peripheral face of the cylinder. At both ends of the shaft (2), a wire holding arm (3,
4), and attach the wire (1) to the tip of the wire holding arm (3, 4) at a predetermined angle with respect to the longitudinal direction of the shaft.
Was stretched. This angle is the notch angle of the inner peripheral surface of the cylinder. The tension of the wire (1) is adjusted with the wing nut (43) and the nut (45). First wire holding arm (3)
Also serves as an arm that moves about the axis.

This end notch device (7) is inserted into the inner space of the insulator tube from the direction of the second wire holding arm (4) to the inverted L-shaped key of the inner diameter chuck (5). Insert until it reaches the height of the end face. As the wire is deeper, the wire (1) bites into the ceramic molded product. Next, by turning the first wire holding arm (3) about the axis (2), the wire (1) cuts the ceramic molded product with a predetermined radius to form a notch. . For cylindrical shaped products having different inner diameters, replace the length of the inner diameter chuck arm (6) with a predetermined size or slide the length of the inner diameter chuck arm (6) to change the size. It is possible to cope with such a mechanism.

A notch device according to another embodiment shown in FIG. 2 will be described. A threaded rod (12) in which a predetermined portion at one end is a right-hand thread and a predetermined portion at the other end is a left-hand thread;
The first chuck arm (15a) and the fourth chuck arm (16a) are rotatably connected to each other with a connecting pin, and both ends of the formed link are connected to each other. The first and second nuts (17) and (18) are rotatably connected to each other by connecting pins (21), respectively.
The first inner diameter chuck (23a) is rotatably connected to a connecting pin (21) connecting the chuck arm (15a) and the fourth chuck arm (16a). The inner diameter chuck arm (15), the inner diameter chuck arm (16), the connecting pin (21) and the inner diameter chuck (2)
The member constituted by 3) is further divided into two sets (15b, 16b,
21, 23b) (15c, 16c, 21, 23c) are prepared and they are mounted on the first nut (19) and the second nut (17) at intervals of 120 degrees in the circumferential direction. Next, a chucking handle (29) is attached to the fixing piece (31) side of the screw rod (12) and fixed, and the fixing piece (31) is fixed.
The first wire holding arm (13) is attached to the fixing piece (33) at right angles to the longitudinal direction of the screw rod (12), and the second wire holding arm is attached to the fixing piece (33) at right angles to the longitudinal direction of the screw rod (12). Attach the arm (14) and attach a protective piece (4
7) Attach. First wire holding arm (13)
A wire (1) is stretched between the tip of the wire and the protection piece (47).
When the protection piece (47) is not attached, the wire (11) is stretched between the tip of the first wire holding arm (13) and the tip of the second wire holding arm (14). The protective piece (47) prevents the tip of the arm from hitting the inner peripheral surface of the ceramic molded body when the apparatus of the present invention is handled, so as not to damage it. First wire holding arm (13) and second wire holding arm (14)
May be appropriately determined depending on the radius of the insulator tube and the notch angle. The screw rod (12) is hollow, and the fixing pieces (31, 33) are coaxial inside, and a shaft for holding and rotating is connected by a deep groove ball bearing. By providing the deep groove ball bearing, it becomes possible to rotate the wire holding arms (13, 14) coaxially and lightly without rotating the screw rod (12).

Next, the operation will be described. When the chucking handle (29) is turned while holding the inner diameter chuck (23), the screw rod (12) rotates, but the first nut (17) and the second nut (18) do not rotate. First nut (17) and second nut (18)
Will move in the axial direction. The first nut (17)
And the second nut (18) are each provided with a right-hand thread (12
a), since it is screwed into the left-hand threaded portion (12b), the first
The distance between the nut (17) and the second nut (18) becomes wider or narrower depending on the direction in which the chuck handle (29) is turned. Therefore, the angle of the link connected to both nuts (17, 18) changes,
The distance of the inner diameter chuck (23) connected to the link from the screw rod (12) varies, and three inner diameter chucks (2) are connected.
The position of 3) can be adjusted so as to be in contact with the inner peripheral surface of the tubular ceramic molded body, so that it is possible to cope with a cylindrical formed article having a different inside diameter.

A projection (30) is provided on a surface of the inner diameter chuck (23) in contact with the inner peripheral surface of the ceramic molded body. Thereby, the notch is finished simultaneously with the role of firmly holding the ceramic molded body, and when the device is taken out, the cut-out ceramic portion can be taken out at the same time, thereby improving workability. In addition, this molded product is obtained by vacuum kneading cup clay and vacuum-extruding it into a cylindrical shape, and has a dense body with no air bubbles inside. Goods.

Next, the procedure of the notch work will be described. The device of the present invention is inserted into the middle space of the tubular ceramic molded body from the direction of the fixing piece (33) until the key at the upper end of the inner diameter chuck (23) is at the level of the end surface of the ceramic molded product. As the wire is deeper, the wire (1) bites into the ceramic molded product. In addition, since the inner diameter chuck (23) is rotatably connected, the angle follows the inner peripheral surface of the insulator tube. Next, as shown in FIG. 3, the chuck handle (2) is moved until the three inner diameter chucks (23) come into contact with the inner peripheral surface of the tubular ceramic molded body.
Turn 9). Next, a first wire holding arm (13)
3 and 4 by rotating the screw in the rotation direction of the threaded rod.
As shown in FIG. 7, the wire (11) cuts out the ceramic molded product at a predetermined radius, and the molded product shown in FIG. 6 is obtained.

[0018]

As is apparent from the above description, according to the present invention, productivity can be improved, finishing accuracy can be improved, and work can be simplified, and the effect of the present invention is extremely large. It is.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a notch device.

FIG. 2 is a perspective view of a notch device according to another embodiment.

FIG. 3 is a perspective view of the embodiment shown in FIG. 2 during a notch operation.

FIG. 4 is a cross-sectional view of the embodiment shown in FIG. 2 during a notch operation.

FIG. 5 is a cross-sectional view showing a method of holding the insulator tube.

FIG. 6 is a cross-sectional view of the porcelain pipe that has been cut out.

FIG. 7 is a sectional view showing a conventional jig.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wire 2 shaft 3 first wire holding arm 4 second wire holding arm 5 inner diameter chuck 6 inner diameter chuck arm 7 notch device 8 notch device 11 wire 12 screw rod 12a right screw 12b left screw Part 13 First arm for holding wire 14 Second arm for holding wire 15 Arm for inner diameter chuck 15a First arm for chuck 15b Second arm for chuck 15c Third arm for chuck 16 Arm for inner diameter chuck 16a Fourth chuck arm 16b Fifth chuck arm 16c Sixth chuck arm 17 First nut 18 Second nut 21 Connecting pin 23 Inner diameter chuck 23a First inner diameter chuck 23b Second inner diameter chuck 23c Third Inner diameter chuck 29 chucking handle 30 projection 31 fixed Reference Signs List 33 fixing piece 35 parallel key 41 screw 43 wing nut 45 nut 47 protective piece 49 clamp lever 51 product part 53 cutout part 54 cutout part 55 continuous part 57 taper part 59 large diameter part 61 support frame body 63 split tochi 63a support surface 70 Handle 71 Blade

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B28B 21/92 B28B 11/12 B28B 21/54

Claims (8)

(57) [Claims] 1. A shaft, a first wire holding arm and a second wire holding arm projecting from both ends of the shaft at right angles and in the same direction with respect to the shaft, respectively, and the first and second wire holding arms. A wire extending between the distal ends of the second wire holding arms at a predetermined angle with respect to the longitudinal direction of the shaft, and the shaft disposed at the center of a cylindrical ceramic molded product disposed on the shaft. An end notch device for a cylindrical ceramic molded product, comprising: 2. The end notch device for a cylindrical ceramic molded product according to claim 1, wherein the extension length of the inner diameter chuck can be changed. 3. A hollow threaded rod in which a predetermined portion at one end is a right-hand thread and a predetermined portion at the other end is a left-hand thread, a first nut screwed into the right-hand thread portion, and the left-hand thread portion. A second nut to be screwed in, and three places between the two nuts are connected by a three-node link so that all of the connection points are rotatable;
An inner diameter chuck mechanism in which a chuck plate is rotatably arranged at each connection point of the links on the two sides, a chucking handle for rotating the screw rod, a shaft inserted into a hollow portion of the screw rod, and the screw A bearing connecting the rod and the shaft,
A first wire holding arm and a second wire holding arm projecting from the shaft at right angles and in the same direction with respect to the shaft, and the first wire holding arm and the second wire holding arm An end notch device for a cylindrical ceramic molded product, comprising: a wire stretched at a predetermined angle with respect to the longitudinal direction of the threaded bar between the distal ends of the arms. 4. A threaded rod having a predetermined portion at one end being a right-hand thread and a predetermined portion at the other end being a left-handed thread, a first nut screwed into a right-hand threaded portion of the threaded bar, A second nut screwed into the left threaded portion of the rod, first, second, and third inner chuck arms rotatably connected to the first nut; Fourth, fifth and sixth inner diameter chuck arms movably connected, and a first connection rotatably connecting the first inner diameter chuck arm and the fourth inner diameter chuck arm. A pin, a second connecting pin rotatably connecting the second inner diameter chuck arm and the fifth inner diameter chuck arm, a third inner diameter chuck arm, and the sixth inner diameter chuck arm And a third connecting pin rotatably connecting the first and second connecting pins, and a third connecting pin rotatably connected to the first connecting pin. A first inner diameter chuck, a second inner diameter chuck rotatably connected to a second connection pin, a third inner diameter chuck rotatably connected to a third connection pin, and the screw rod A chucking handle fixed to an end of the shaft, a shaft inserted into the hollow portion of the screw bar, fixing pieces attached to both ends of the shaft, a bearing connecting the screw bar and the shaft, A first wire holding arm and a second wire holding arm fixed to the fixing piece at right angles and in the same direction with respect to the screw rod, respectively;
And a wire stretched at a predetermined angle with respect to the longitudinal direction of the threaded rod between the distal ends of the wire holding arm and the second wire holding arm. End notch device. 5. The cylindrical ceramic molding according to claim 1, wherein the inner diameter chuck arms connected to the respective nuts are arranged at equal intervals in the rotation direction of the screw bar. End notch device for goods. 6. The end notch device for a cylindrical ceramic molded product according to claim 1, wherein the inner diameter chuck has a projection on an outer surface thereof. 7. A shaft is inserted into a hollow portion of the cylindrical ceramic molded product, and the shaft is held at the center of the cylindrical ceramic molded product by an inner diameter chuck provided on the shaft. A wire stretched at a predetermined angle with respect to the longitudinal direction of the shaft, between the distal ends of a first wire holding arm and a second wire holding arm fixed to the shaft at right angles and in the same direction. Is rotated about the axis. 8. A shaft is inserted into a hollow portion of a cylindrical ceramic molded product, an inner diameter chuck disposed on the shaft is expanded, and the shaft is held at the center of the cylindrical ceramic molded product. And a first wire holding arm and a second wire holding arm fixed at a predetermined angle to the longitudinal direction of the shaft between the distal ends of the first wire holding arm and the second wire holding arm fixed to the shaft at right angles and in the same direction. A method of cutting an end portion of a cylindrical ceramic molded product, wherein the wire is rotated about the axis.