JPH03261013A - Manufacture of insulator - Google Patents

Abstract

PURPOSE:To heighten junction force to cement by performing a corrugating process on a metal fitting adhesive part of an insulator compact which is not yet dried, while holding it between the uneven shaped inside and outside molding irons supported swingably on the outside and inside as well as in the radial direction, from both sides by the irons with pressure while the compact is being rotated. CONSTITUTION:An undried insulator compact G is placed on a wheel 2, an inside processing arm 6 is made to rise by a cylinder 13, an inside molding iron 14 is positioned inside a head part, next, an outside processing arm 5 is made to fall by a cylinder 11 to light close the outside molding irons 7, 7. Next, the insulator compact G is rotated, the molding iron 7 freely swings following somewhat decentering of the insulator compact G. When in this state force is applied by a torque cylinder 17 between the inside processing arm 6 and the outside processing arm 5, the insulator compact G is held from both sides with pressure by the inside processing iron 14 and the outside molding iron 7 to plastically deform the head part of the compact G to perform corrugation processing for making overall inside and outside the heat part uneven. Since in this way the insulator can be manufactured without resorting to cutting so that junction force of cement can be heightened without performing sandblasting on the metal fittings adhesive face as conventional.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing an insulator, such as a suspended insulator, in which a metal fitting is bonded to a corrugated area.

(Prior art) For example, in the head of a suspension insulator, porcelain particles called sand are used to increase the bonding strength when cementing the cap fitting and the suspension pin to the outer and inner surfaces of the porcelain body, respectively. The glaze is applied in a fixed width. However, this sand is expensive to manufacture, and it is not easy to uniformly apply sand glaze to a specific area.Moreover, the sand may interfere with the physical and electrical properties of the insulator. However, there were still some problems.

Therefore, the inventors of the present invention considered ways to omit such sanding and maintain sufficient bonding strength with cement, and as a result, they came up with a method of creating irregularities on the surface of the joint surface of the metal fittings, etc. of the insulator itself. It's arrived.

However, if the head of a suspended insulator is made uneven by cutting in a post-process after drying or firing, minute cranks will remain on the cut surface, and there is a risk of crack failure due to the minute cracks. Due to current insulator molding processes, it was impossible to mold both the inner and outer surfaces into an uneven shape.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems and provides a surface of the joint surface of metal fittings, etc., which can sufficiently increase the joint strength with cement without using sanding. This was completed in order to provide a method for manufacturing an insulator with unevenness formed thereon.

(Means for Solving the Problems) The present invention, which has been made to solve the above-mentioned problems, has an uneven structure in which an undried insulator molded body is rotated and its outer and inner surfaces are supported so as to be swingable in the radial direction. This method is characterized by applying pressure from both sides with a shaped outer surface forming trowel and an inner surface forming trowel, and corrugating the parts of the insulator molded body to which the metal fittings are bonded.

(Example) The present invention will be explained in detail below using illustrated examples.
First, the structure of an apparatus for carrying out the present invention will be explained.

In the figure, (1) is a frame, (2) is a potter's wheel installed on its upper surface, and the undried insulator molded body G placed on the potter's wheel (2) is rotated at a constant speed by a motor (3). be able to.

(4) is a vertical axis provided at a position away from the rotation axis of the potter's wheel (2). An outer surface machining arm (5) and an inner surface machining arm (6) are attached to two positions above and below this vertical shaft (4) so as to be slidable with respect to the vertical shaft (4), respectively. As shown in FIGS. 2 and 3, the external processing arm (5) is equipped with a pair of external forming trowels (7L) each having an uneven inner surface.
(7) and gears (8) and (8) to open and close it.
and a cylinder 00 with a rack (9) that rotates these gears (8L (8) in opposite directions by the same angle). Therefore, around the head of the undried insulator molded body G placed on the potter's wheel (2), the outer surface forming trowels (7), (7)
When the outer surface forming trowel (7L (7) is closed, the insulator molded body G
The head can be pinched with any force. In addition, since the external surface processing arm (5) is supported so as to be able to freely swing about the vertical axis (4), the external surface forming trowels (7), (7) supported on it are temporarily used for insulator forming. Even if the head of the body G is eccentric with respect to the center of the potter's wheel (2), it can follow it and freely swing in the radial direction of the insulator molded body G about the vertical axis (4). Note that (11) is a cylinder for forcibly raising the outer surface machining arm (5).

On the other hand, the inner surface machining arm (6) is lifted up by the cylinder 03) and moved to the vertical axis (4) by the action of the ball 02).
An inner forming iron (14) with an uneven outer surface is supported at its tip. This internal processing arm (6) is splined to the vertical shaft (4) and is identical to the slide torque arm 05) which is splined to the vertical shaft (4) at a position further above the external processing arm (5). It has a structure that swings while maintaining the angular relationship. And this slide torque arm 05
) and the arm 0ω protruding from the external surface processing arm (5), a torque cylinder 071 as shown in FIG. 2 is provided, and the slide torque arm 09 and the external surface processing arm (5) Apply a force in the direction of separating the two. As a result, the inner surface machining arm (6) and the outer surface machining arm (
5), and the inner surface machining arm (6) and the outer surface machining arm (5) can freely swing in the radial direction about the vertical axis (4). .

(Function) Next, the operation of the above-described apparatus and the method for manufacturing an insulator of the present invention will be explained.

First, place the undried insulator molded body G on a potter's wheel (2) as shown.
Put it on. At the same time, the inner surface processing arm (6) is raised by the cylinder 03), and the inner surface forming iron (14) is positioned inside the head. Furthermore, the outer surface processing arm (5) is lowered by the cylinder (II), and the outer surface forming trowel (7L (7) at the tip thereof is positioned outside the head, and the outer surface forming trowel (7
Gently close L (7). As a result, as shown in the operating principle diagram of FIG. 5, the head of the undried insulator molded body G is pinched from the outside by the outer surface forming trowels (7), (7) with a constant force.

Next, the insulator molded body G is rotated using a potter's wheel (2).
Even if there is some eccentricity between the cap and the head of the insulator molded body G, the outer surface molding iron (7L (7) is supported so as to be able to swing freely in the radial direction around the vertical axis (4). Therefore, it will swing freely following this amount of eccentricity.

In this state, when force is applied between the inner surface processing arm (6) and the outer surface processing arm (5) using the torque cylinder 07),
As shown in the operating principle diagram in Figure 5, the inner surface machining arm (6)
The inner surface forming trowel (14) at the tip of is a torque cylinder 0'I)
The generated force makes contact with the inner surface of the head of the insulator molded body G, and the head is formed by an uneven outer surface forming trowel (7) and an inner surface forming trowel (14).
) will be squeezed from both sides. As a result, the head of the insulator molded body G undergoes plastic deformation, and is corrugated into an uneven shape over the entire circumference of the inner and outer surfaces of the head. Furthermore, since the inner surface forming trowel (14) can freely swing together with the outer surface processing arm (5), it is not affected by the eccentricity of the insulator molded body G.

In the above embodiments, the corrugation processing of the head of the suspended insulator was mainly explained, but it goes without saying that the corrugation processing of other parts can be performed in the same manner.

As described above, according to the present invention, corrugation processing can be performed by rotating an undried insulator molded body and compressing the required portions from both sides with an uneven outer surface forming trowel and an inner surface forming trowel. Unlike the uneven portions formed on the insulator molded body in this way, there is no risk of cranking (unlike those formed by cutting), and the bonding force during cement bonding can be increased without sanding.

(Effects of the Invention) As explained above, according to the method of the present invention, it is possible to manufacture an insulator with unevenness on both the inner and outer surfaces of required parts such as metal fitting bonding parts without cutting. Since the bonding force with cement can be increased without sanding the bonding surface of the metal fittings, the conventional problems associated with sanding can be eliminated. Furthermore, according to the method of the present invention, corrugation processing can be performed while absorbing some eccentricity that inevitably occurs in the insulator, so that workability can be improved. As such, its contribution to the development of industry is extremely large.

[Brief explanation of drawings]

2 is a side view of the main parts, 3 is a plan view of the external processing arm, 4 is a plan view of the main parts, and 5 The figure is a plan view showing the principle of operation. (7): External molding trowel, (14): Internal molding trowel, G: Insulator molded body. Figure 2 Figure 3 Figure ■ Figure

Claims (1)

[Claims] While rotating the undried insulator molded body G, its outer and inner surfaces are pressed from both sides by an uneven outer surface forming trowel (7) and an inner surface forming trowel (14) which are supported so as to be swingable in the radial direction, and the insulator is formed. A method for manufacturing an insulator, which comprises corrugating the part of the molded body G where the metal fittings are bonded.