JPS6244011A - Molding for reinforced insulated section of extrusion type mold joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved method of forming reinforced insulation in an extrusion mold joint.

Since the extrusion mold joint is a method of extruding resin into a mold to form a reinforcing insulator, misalignment (eccentricity) mainly occurs between the conductor of the sleeve and the insulator. If this eccentricity is large, the insulation thickness of the connection portion becomes locally thick or thin, which becomes an electrical weak point. Particularly thin areas are a problem.

Therefore, on-site management of the eccentricity, uneven thickness, and minimum insulation thickness of the connection reinforcing insulator is now becoming important.

Therefore, as for the current management method, (11 Insulating material), before extruding the material, the eccentricity of the conductor in the mold is investigated in advance, and after extrusion, the insulating layer is shaved and processed according to the eccentricity.

(2) After extrusion molding, take an X-ray image, investigate the eccentricity of the insulator layer, and scrape the insulator layer.

(8) Once the product is completed, we will take an X-ray to check it.

There is.

In addition, as a method of cutting the insulating layer to a predetermined diameter, a knife,
Glass pieces, etc. are used, but the workability is very poor.

However, such conventional molding methods have the following problems.

In other words, regarding (1) above, after extrusion, the conductor becomes “
There may be a "misalignment".

Regarding (1) and (23), during the cutting work of the insulator layer,
Since it is not possible to check the thickness of the insulation (from the conductor to the surface of the insulator), errors and machining errors occur.

(2) As for f81, it is a large-scale process and requires a lot of work time, resulting in poor workability.

Regarding (8), there is no recourse.

The present invention eliminates such conventional drawbacks, and easily prevents eccentricity between the conductor and the complementary insulator and ensures uniform thickness of the reinforcing insulator in the work of forming the reinforcing insulator after extrusion. There is a need to further improve the machining workability.

The present invention relates to a method for forming a reinforcing insulation part after extrusion molding of an extrusion mold joint, by scraping the side surface of an extruded insulating layer to make a flat surface, and using the flat surface to measure the thickness using an ultrasonic thickness measuring device. The method is characterized by cutting the insulator layer while checking the insulation thickness, creating a polygonal insulator that circumscribes a predetermined circle, and finally cutting off the corners to form a circular insulator without a predetermined uneven thickness. .

Further, when creating a flat surface on the side surface of the insulating layer, it is preferable to use an electric planer to cut the side surface.

Next, the molding method of the present invention will be explained with reference to the drawings.

(a) The reinforcing insulator after extrusion molding is eccentric to the conductor by 5 as shown in Fig. 1. The degree and tendency of eccentricity are unknown.

(b) Here, in order to find out the eccentricity of this insulator and the wall thickness up to the conductor, an ultrasonic thickness measuring device is used, but there is a gap between the ultrasonic oscillator (element) and the temporary measurement object. If there is, it cannot be measured and must be filled with some kind of medium. Therefore, (1) As shown in Figure 2, the side surface of the round insulator is cut to form a flat surface so that it will come into close contact with the flat surface of the element.

■ Furthermore, since this distance between planes alone is insufficient,
Fill with liquid during this time. This liquid may be water, glycerin, or alcohol, but it is thought that it may penetrate into the insulator and deteriorate the electrical properties. Therefore, a thin sheet is placed between the insulator and the oscillator, and a liquid is placed on top of it to bring the oscillator into close contact. This sheet may be of any material as long as the liquid does not permeate through it, but the thinner it is, the closer it is to an insulating material, the better (see Figure 4).

(c) To find out the thickness and eccentricity of the insulator using the above method,
While creating a flat surface, it is shaved to a predetermined dimension.In order to create a smooth flat surface, using an electric planer rather than a knife or the like will result in a smoother flat surface and further reduce the work time.

2) As mentioned above, we use an electric planer to carve without knowing the thickness, but the target shape to carve is a polygon that circumscribes the final circular shape.

(e) Once the desired polygon is created, cut off the corners and form it into a circular insulator with the specified thickness.

The effects of the present invention are as follows.

Since it is possible to cut while ensuring the insulation thickness, it is possible to easily ensure the eccentricity between the conductor and the insulator and the minimum insulation thickness, and the work time can be shortened by using an electric planer etc. (improved workability) ).

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing the state of eccentricity between the insulator and the conductor after extrusion molding according to the present invention, and Figure 2 is a diagram showing the state of eccentricity between the insulator and the conductor after extrusion molding according to the present invention. FIG. 8 is an explanatory diagram showing a state in which the insulation thickness ftl is being measured. FIG. 1 is a schematic explanatory diagram showing a state in which a sheet is placed on an insulator plane in order to measure the thickness of an insulator layer in the present invention, a liquid medium is placed on top of the sheet, and an elevating device is brought into close contact with the sheet. 1... Insulator after extrusion 2... Conductor (including sleeve) 8... Ultrasonic thickness measuring device Number... Oscillator 5... Medium (liquid) 6... Sheet? ...Oscillator element

Claims (1)

[Claims] 1. In a method for forming a reinforcing insulation part after extrusion molding of an extrusion mold joint, the side surface of the extrusion molded insulator layer is scraped to make a flat surface, and the flat surface is used to create an ultrasonic thickness. A characteristic feature is that the insulation is shaved while checking the insulation thickness with a thickness measuring device, creating a polygonal insulator that circumscribes the specified circle, and finally cutting off the corners to form a circular insulator with a specified thickness and no uneven thickness. A method for forming the reinforcing insulation part of an extrusion mold joint. 2. The method for forming a reinforcing insulating part of an extrusion mold joint according to claim 1, wherein the cutting of the insulating layer is performed using an electric plane. 3. When measuring insulation thickness using an ultrasonic thickness measuring device,
The reinforcing insulating part of the extruded mold joint according to claim 1, characterized in that the insulation thickness is measured by placing a sheet on the insulator and placing an oscillator thereon through a liquid medium. molding method.