JPS58133108A - Method of cutting stress corn - 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 a cutting method for finishing a molded stress cone of an electric cable. One method is to place a split mold on top of it and heat mold it.

In such a case, after removing the mold, please refer to "Figure 1".
A convex portion 14 may be formed on the stress cone 12 of the reinforcing insulator 10, as shown in FIG.

Conventionally, the shape of the stress cone 12 was created by cutting the convex portion 14 with a knife.

However, if you move the knife from top to bottom in the direction of arrow 16, there is a possibility that the excess force will damage the cable insulation 18, and if you move the knife from bottom to top in the direction of arrow 20, it may damage the cable insulation 18. Insulator 1 may be scratched, and these scratches may cause an insulation breakdown accident.

Furthermore, since it is difficult to make the amount of cutting constant, there is also the problem that the shape of the stress cone 12 differs on the circumference.

The present invention solves the above problem by using a special knife guide to cut the stress cone 12 without damaging the reinforcing insulator 10 or the cable insulator 18.

Example First, the guide tool will be explained.

In "Figures 2 and 3", 22 indicates the entire guide tool.

24 is its main body, for example semi-cylindrical metal or FR
It consists of P, etc. Its inner diameter A is approximately equal to or slightly larger than the outer diameter B of the reinforcing insulator 10 . Note that this main body 24 may have a cylindrical shape. However, only the area near the notch 26 described below is actually useful.

A large notch 26 is provided in the side surface of the main body 24. The main portion of this notch 26 has a parabolic cut surface. In other words, the shape of the orthographic projection onto the yz plane in "Figure 3" is V-shaped.However, this V-shape has one oblique side 28 wide open and the other oblique side 30 almost vertical. The form is similar to ``shi'' in ``shi''.

The shape of the oblique side 28 when viewed from the side is almost the same as the finished outline of the stress cone 12.

However, this part may be formed in a straight line.

As explained later, this part becomes a guide when moving the knife.

Also, the tip 32 of the V-shaped notch 26 and the shaft 34 of the main body 24
The distance C between the stress cone 12 and the xy plane including
The radius of the rising edge 13 (that is, the radius of the cable insulator 18) is equal to D.

One end of the main body 24 is rotatably fitted into a two-split guide ring 36. At that time, the main body 24
The shaft 34 of the ring 36 and the shaft of the ring 36 are arranged to be aligned.

The guide ring 36 is identified on the cable by a bolt 40 in the part of the fixing part 38.

Next, the cutting method will be explained.

1- Mount the guide 22 on the end of the reinforcing insulator 10. At that time, as shown in the figure, the tip 3 of the notch 26
2 and the rising edge 13 of the stress cone 12. Note that only the main body 24 is shown in "Fig. 4". Then, only the portions of the stress cone 12 that need to be shaved off (such as the convex portion 14) are exposed above the parabolic surface of the notch 26.

Therefore, the convex portion 14 is shaved by applying the knife to the oblique side 28 while keeping it parallel to the X-axis and moving it along the oblique side 28. / After reaching the point, rotate the main body 24 appropriately and sharpen again. Repeat this to remove the whole thing.

When cutting in the direction of arrow 16, even if there is excess force as shown above,
Since the knife does not advance beyond the tip 32, there is no risk of damaging the cable insulation 18. Also, when cutting in the direction of the arrow 20, the knife does not enter t' beyond the oblique side 28, so there is no fear of damaging the reinforcing insulator 10.

Advantages of the Invention (1) Since the cutter does not enter deeper into the reinforcing insulator 10 than the notch 26 of the guide 22, there is no fear of damage.

(2) The shape of the stress cone 12 becomes uniform over the entire circumference.

(3) The part that becomes the guide (main body 24) rotates, so
Good workability.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the reinforcing insulator immediately after molding, Fig. 2 is a side view of an example of the guide tool 22 used in this invention, Fig. 3 is also a perspective view, and Fig. 3 is a detailed explanation of the invention. figure. 10: Reinforcement insulator 12: Stress cone 14: Convex portion 18: Cable insulator 22: Guide tool 24: Main body 26: Notch

Claims (1)

[Claims] In the case where after forming a camellia strong insulator of a cable connection part by a molding method, the convex part formed in the stress cone part is cut with a cutter to remove the reinforcement. On top of the insulator, a cutter guide having a semi-cylindrical body with an inner diameter approximately equal to the outer diameter of the reinforcing insulator, and a cutout having a parabolic cross-sectional shape on the side surface thereof, is placed so that the cutter guide is centered with the reinforcing insulator. the reinforcing insulator protruding from the notch by moving the q object along the parabolic surface of the notch of the guide tool; The stress cone cutting method is characterized by cutting the convex part of the cone.