JPS60121028A - Method of swaging of heat generating tube of sheath glow plug - Google Patents

Abstract

PURPOSE:To prevent disconnection due to vibration and to improve heat conductivity by reversing the direction of working when manufacturing a titled heat generating tube by swaging the combined body. CONSTITUTION:A welded body 106 made by welding a heat generating coil to the tip of a center electrode rod is inserted concentrically into a metallic tube 102 having closed tip, and the bottom of the tube 102 and heat generating coil are connected. A combined body 110 is manufactured by filling insulating ceramic powder 107 in the tube 102 and attaching a stopper 108 made of elastic body at open end. This combined body is swaged and the tube 102 is drawn to specified outer diameter and glass sealed 121 to form a heat generating tube 100. Here, swaging is made from opening side instead of tip side of the tube 102. By this way, the powder 107 can be filled to high density in the tip side of the tube 102, retaining force of the coil 104 becomes sufficient, heat insulation due to vibration is prevented and heat conductivity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for processing a heat-generating chicove of a sheathed glow plug.

As shown in FIG. 1, the heating tube is manufactured by using a pipe 102 made of heat-resistant metal such as stainless steel whose tip is narrowed to a slightly smaller diameter and having a tip hole 101, and one end of a heating coil 104 at the tip of a metal center electrode rod 103. A welded body 106 is manufactured by welding or the like, and a heat-resistant metal column 105 is fixed to the other end of the coil 104 by welding or the like.
The welded body 106 is extended into the interior of the welded body 106. Next, as shown in FIG. 2, a stopper 105 is attached and welded to the tip hole 101, and an electrically insulating ceramic powder 107 such as magnesia is filled in the pipe 102, and a pillar made of an elastic material such as rubber is filled in the opening. 108 is fitted to produce a combined body 110. Furthermore, this combined body 110 is attached to the pipe 10 by a swaging machine.
The outer diameter of the center electrode rod 103 is swaged and narrowed, and the tip end of the center electrode rod 103 is concentrically inserted into the metal tube bottom 109 with a closed tip as shown in FIG. The heating tube 100 is manufactured by connecting the tip of the tube 103 with a heating coil 104, filling the inside of the metal tube with electrically insulating ceramic powder 107, and having a glass seal 121 applied to the end. This heat generating tube 100 is fitted coaxially into a metal tube 120 as shown in FIG. The sheathed glow plug 140 is fixed by screwing, etc., and other necessary parts such as the terminal 130 are assembled.

Conventionally, the swaging process of the heat generating tube 100 is performed by connecting the processing section 10 of the swaging machine 1 of the combined body 110 and the tip of the moving mechanism (not shown) of the motor (workpiece) to be processed of the combined body 110, as shown in FIG. The rear end portion of the center electrode rod 103 protruding from the provided pipe 102 is housed in a cylindrical workpiece holder 1△ having a coaxial center, and the pipe 10
The tip of the pipe 102 is placed at the center of the processing section 10, and the pipe 102 is inserted between the pair of dies 2, and the holder 1Δ is sequentially moved to the right in the figure.
Perform swage processing along the 0 frontage, and pipe 102
After reducing the total length of the holder 1A, return the holder 1A to the position on the left side of the figure where the workpiece was attached, and remove the swaged heating duplex 1.
00 from the holder 1A, or 7j was manufactured by moving the holder 1A further to the right in the drawing and pushing down the heat generating tube 100 after processing L1, as shown in FIG. However, in this conventional swage processing method, the combined body 11
Ceramic powder 1 filled in pipe 102 of
01, since the pipe 102 is narrowed from the tip, the stopper 108 is pressed against the frontage attached to 1. As a result, the packing density of the ceramic powder 107 increases in the opening side part (13 rt ceramic powder 107
Since the packing density of the coil 104 decreases, the holding force of the heating coil 104 whose tip is located at the spring portion becomes insufficient, which makes wire breakage more likely to occur due to vibration and reduces thermal conductivity.

The purpose of the present invention is to provide a sheathed tube that can be filled with insulating ceramic powder in a high density at the end of a metal tube.
- To provide a method for swaging the heating duplex of a plug.

The sheathed bulb of the present invention [1- Swaging method of the heat generating duplex of a plug (well, the tip end of the center electrode rod is inserted concentrically into a metal tube with a closed end, and the bottom of the metal dicob and the tip of the center electrode rod are inserted concentrically into a metal tube with a closed end. A combination body is formed by connecting the metal tube with a heating coil, filling the metal tube with electrically insulating ceramic powder, and removing an elastic column at the open end, and swaging the combined body using a swaging machine. In the swaging method for heat generating tubes of sheathed glow plaques, which reduces the outer diameter of metal tubes to set dimensions, C1 comprises swaging the metal tubes in a ratio of 1:1 of the gold 1 tube of the above-mentioned composite body.
46. The swaging method of the heat generating duplex of the sheathed glow plug of the present invention has the following advantages based on the above structure.

b) During the swaging process of the heat generating duplex, join body 1
When the opening of the pipe 102 is determined and the swaging process is performed, the ceramic powder inside C1 becomes densely packed near the tip of the metal pipe, and the holding force of the heating coil can be increased.

1] l)t? By increasing the holding power of the heating coil by the ramic powder, disconnection of the heating coil due to vibration can be prevented.

c) Since the ceramic powder around the heating coil has a high density, the dicol heat generated in the heating coil is efficiently transmitted to the metal duplex, and the surface temperature of the metal tube rises quickly.

Next, the present invention will be explained based on embodiments shown in FIGS. 6 to 9.

1 shows a swaging machine used in the swaging method of the heat generating tube sheathed glow plug of the present invention. The swage processing unit 10 is mounted on the swage processing unit 10, the t-type M installed below the swage processing unit 10, and the swage processing unit 1 on both sides of the swage processing unit 10 on the bed 20.
It consists of a main shaft of 0 and a workpiece moving machine 4f+S30 set so that the coaxial center is on the right.

The swage processing unit 10 has a known configuration, and includes a cylindrical or disc-shaped case 11 fastened to the upper surface of the bed 20 so that its axis is horizontal, and an inside ring 12 fitted to the inner circumference of the case 11. and arranged on the side of case 11,
a human horn 1-15 connected to a drive pulley 13 provided on the output shaft of the motor M via a bell 1-14;
A large number (eight in this embodiment) of hammer rollers (outer periphery [l-ra]) 16 are arranged at equal intervals on the inner periphery of the inside ring 12, are connected to the inlet convertible 15, and move within the inside ring 12; A pair of hammers (hammers) are arranged alternately facing each other inside the rotational track of the hammer roller 16.
17 and a pair of spindles 18, a wedge 19 inserted inside the backer 17 so as to be displaceable in the axial direction, and a wedge 19 disposed inside the pattern 19 to determine the axial position of the PA 19. It consists of a pair of dies 2 whose inner diameter is adjusted by. On both sides of the die 2 are the center grooves 2△ and 2 of the die 2.
Workpiece guide tubes 21 and 22 are provided which are concentric with the main axis, which is the center of B, and into which the arbor is inserted.

The workpiece moving machine WJ30 includes the swage unit [part 10
The air cylinder 31 is equipped with J
, a pushing arbor 32 which is driven in two directions, and a receiving arbor 34 which is provided on the other side (right side in the figure) of the swage processing section 10 and is driven reciprocally by an air cylinder 33.

The swaging process of the heat-generating bulb 100 by the swaging machine 1 involves sandwiching the combined body 110 shown in FIG. As shown in FIG. 9, the opening of the vibrator 102 is determined and swaging is performed using a die. When the entire length of the vibrator 102 is narrowed down to a predetermined outer diameter, the arbor 326
and 34, or advance further to drop the workpiece at a predetermined position.

10 and 11 show other embodiments.

In this embodiment, a pair of arms are used in the workpiece movement mechanism.
Instead of holding the workpiece between them, chucks 41 and 42 are provided on both sides of the die, and the workpiece can be gripped and changed to the vibrator 1.
The entire length of 02 is swaged.

[Brief explanation of the drawing]

Figures 1, 2, 3, and 4 are manufacturing process diagrams of a sheathed glow plug, Figure 5 is a swaging process diagram of a conventional heat generating duplex, and Figure 6 is a heat generation diagram of a sheathed glow plug according to the present invention. A front view of a swaging machine used in the tube swaging method, FIG. 7 is an enlarged sectional view of the processing part, FIG. 8 is a side view, FIG. 9 is an explanatory diagram of its operation, FIGS. FIG. 11 is a schematic diagram of the main parts of another embodiment.

Claims (1)

[Claims] 1) The tip end portion of the center electrode rod is concentrically inserted into a metal tube with a closed end, and the bottom of the metal tube and the tip of the center electrode rod are connected by a heating coil; The metal tube is filled with electrically insulating ceramic powder and an elastic column is attached at the open end (=Jt).The combined body is swaged using a swaging machine, and the outer diameter of the metal tube is adjusted to the set size. A method of swaging a heat generating tube of a sheathed glow plug to be squeezed, characterized in that the swaging process is performed while the frontage of the metal tube of the combined body is known.