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Insulator for spark plug, and method for manufacturing spark plug

A manufacturing method and insulator technology, applied in spark plug manufacturing, spark plugs, manufacturing tools, etc., can solve problems such as increased manufacturing costs, and achieve the effects of guaranteed yield, high yield, and low manufacturing cost

Active Publication Date: 2009-09-23
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the insulator for the spark plug may become a defective product, or the pressing pin needs to be frequently replaced, resulting in an increase in manufacturing cost

Method used

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  • Insulator for spark plug, and method for manufacturing spark plug
  • Insulator for spark plug, and method for manufacturing spark plug
  • Insulator for spark plug, and method for manufacturing spark plug

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The manufacturing method of Example 1 is a method of manufacturing the insulator 2 which is an insulator for a spark plug. Since the spark plug 100 includes the insulator 2, first, the overall configuration of the spark plug 100 will be explained.

[0032] The spark plug 100 includes: a cylindrical metal shell 1; an insulator 2 fitted into the metal shell 1 so that its front end protrudes; a center electrode 3 provided in the insulator 2 with its front end protruding; Ground electrode 4 configured such that one end thereof is joined to metal shell 1 by welding or the like and the other end is laterally bent such that one side of the other end faces the front end portion of center electrode 3 .

[0033] A spark discharge gap g is formed between the ground electrode 4 and the center electrode 3 . The metal shell 1 is formed in a cylindrical shape from metal such as mild steel, and forms a housing for the spark plug 100 . The outer peripheral surface of the metal shell 1...

Embodiment 2

[0074] Although the manufacturing method of the second embodiment is similar to that of the first embodiment, the pressing pin 250 and the upper holding portion 286 are used in the second embodiment instead of the pressing pin 50 and the upper holding portion 86 of the first embodiment. Therefore, due to the difference in the structure of these components, the above-mentioned steps are also different. Hereinafter, differences from the manufacturing method of Embodiment 1 will be mainly described, and descriptions of the same steps as those of Embodiment 1 will be omitted or simplified. The same configurations as in Embodiment 1 are denoted by the same reference numerals, and descriptions of these same configurations are omitted.

[0075] Below, will refer to Figure 9 to Figure 13 A method of manufacturing the insulator 2 according to Example 2 will be described.

[0076] preparation steps

[0077] Such as Figure 9 As shown, in the preparation step, the pressing pin 250...

Embodiment 3

[0102] Although the manufacturing method of embodiment 3 is similar to the manufacturing method of embodiment 1, as Figure 14 and 15 Shown, changed the pressing pin configuration step of embodiment 1 (as image 3 shown) and powder filling steps (such as Figure 4 shown). Hereinafter, differences from the manufacturing method of Embodiment 1 will be mainly described, and descriptions of the same steps as those of Embodiment 1 will be omitted or simplified. In addition, the same configurations as those of Embodiment 1 are denoted by the same reference numerals, and descriptions of these same configurations are omitted.

[0103] preparation steps

[0104] In the preparation step, similarly to Embodiment 1, the press pin 50 and the forming die 80 were prepared. As described in the preparation steps of Embodiment 1, the press pin 50 has: the first shaft portion 51 on the front end side in the axial direction; the second shaft portion 52 with a larger diameter; and the step...

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Abstract

The invention provides an insulator for a spark plug, and a method for manufacturing the spark plug. The method includes: a preparing step; a press pin arranging step; a powder filling step after the press pin arranging step; a cavity blocking step after the powder filling step; a compression molding step after the cavity blocking step; a die releasing step after the compression molding step; and a press pin removing step after the die releasing step.

Description

technical field [0001] The present invention relates to an insulator for a spark plug and a method for manufacturing the spark plug. Background technique [0002] Japanese Patent Application Laid-Open No. 2000-315563 Figure 2 to Figure 6 A method of manufacturing an insulator for a spark plug is disclosed. This manufacturing method forms through-holes for inserting a center electrode and a terminal electrode in an axial direction in an insulator. [0003] In this manufacturing method, first, as a preparation step, a press pin for forming a through hole and a forming die having a cavity in which a rear end side in the axial direction is formed There are openings. A rib-shaped pin-side helical portion that spirally rotates around the outer peripheral surface of the press pin is formed at the rear end side of the press pin. [0004] Next, as a powder filling step, green powder is loaded from the opening and filled into the cavity. Next, as a press pin arranging step after ...

Claims

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Application Information

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IPC IPC(8): H01T21/02H01T13/20H01T13/38
CPCB28B1/30B28B1/44B28B3/003
Inventor 本田稔贵水野贵光樱井真一
Owner NGK SPARK PLUG CO LTD
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