JP2003133035A - Manufacturing method of sheath electronic apparatus and manufacturing device for same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a sheath electronic apparatus capable of reducing work such as cleaning of leaked insulating powder and of effectively restraining adhesion of the insulating powder to a component such as a forging tool in diameter-reducing work of a sheath tube for enclosing the insulating powder. SOLUTION: When the diameter of the sheath tube is pressingly reduced to enclose the rear end of the sheath tube toward a sealing member with the insulating powder filled inside the sheath tube along with an electric element, the insulating powder leaked outside the sheath tube is removed by a powder removing means 125.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for manufacturing a seeds-sealed electronic device used for glow plugs for preheating diesel engines.

[0002]

2. Description of the Related Art In a glow plug for preheating a diesel engine, a sheathed heater as a sheathed type electronic device as described above is used. As such a sheath heater, a resistance heating element composed of a resistance heating wire coil or the like is arranged in the hollow portion of the sheath tube made of a heat-resistant metal having a hollow shaft shape with a closed tip, and It is known that insulating powder is filled between them. A glow plug is formed by attaching a metal shell having a mounting screw portion formed on the outer peripheral surface of the sheathed heater, and is mounted on an engine block of a diesel engine so that the vicinity of the end of the sheathed heater is located in the combustion chamber. To be done. In addition, a fuse-type temperature sensor is used as a sheath-enclosed electronic device other than the sheath heater. This uses a temperature-sensitive metal body made of a fuse metal whose melting point is adjusted in the vicinity of the detection temperature, and a sheath tube made of a heat-resistant metal in the shape of a hollow shaft whose tip is closed together with insulating powder. The body is enclosed. When the ambient temperature reaches or exceeds the detection temperature, the temperature-sensitive metal body is melted, and the molten metal layer penetrating the insulating powder filling layer short-circuits the sheath tube and the temperature-sensitive metal body. At this time, the temperature is detected by detecting a change in conduction resistance between the sheath tube and the temperature-sensitive metal body.

Such a seed-sealed electronic device is manufactured through the following steps. First, place an electric element consisting of a resistance wire heating element or a temperature-sensitive metal in the hollow part of the sheath tube, and connect the energizing terminal shaft (or lead) connected to it to the outside from the rear end side opening of the sheath tube. Make it protrude. After filling insulating powder such as magnesia powder between the two, a sealing member (for example, an O-ring) made of silicone rubber or the like is fitted inside the opening of the sheath tube, and the rear end of the tube is sealed. Enclose in a form that is caulked by forging.

[0004]

The caulking and forging process of the sheath tube as described above is carried out by a rotary forging method called swaging. Unlike forging by static dies, this forging is performed in such a manner that the forging tool rotates at high speed and the impact force is applied to the sheath tube one after another, so until the tube is completely sealed, Leakage due to impact vibration of the insulating powder filled in is often a problem. In particular, the scattered powder easily pollutes the inside of the forging device, and maintenance work such as cleaning the inside of the device after the process is very troublesome. Also, if this cleaning is neglected, powder will bite into the component parts of the device, particularly the forging tool or the pin for connecting it to the holder, and the processed surface will be roughened,
This leads to defects that shorten the life of parts. Further, even if it is regularly cleaned, it is difficult to operate it in a state in which the powder is completely removed because it leaks sequentially during processing, and there has been a tendency that the life of parts is shortened more or less.

An object of the present invention is to reduce the labor such as cleaning the leaked insulating powder when reducing the diameter of the sheath tube for enclosing the insulating powder, and to insulate parts such as forging tools. It is an object of the present invention to provide a method and an apparatus for manufacturing a seeds-encapsulated electronic device capable of effectively suppressing powder biting.

[0006]

In order to solve the above problems, in the method of manufacturing a seeds-enclosed electronic device of the present invention, a hollow shaft shape having a closed front end and an open rear end is used. A cylindrical sheathed tube, an electric element arranged inside the sheathed tube, one end connected to the electric element, and the other end extending outward from the rear end side opening of the sheathed tube. The conductive path forming body to be arranged, the insulating powder filling the space between the sheath tube and the electric element and the conductive path forming body, and the conductive path forming body extending inside the rear end side opening of the sheath tube. A sealing member that is fitted in an allowed state is provided, and the rear end portion of the sheath tube is reduced in diameter and brought into close contact with the sealing member so that the insulating powder is enclosed in the hollow portion of the sheath tube together with the electric element. Seeds included In a manufacturing method for manufacturing an electronic device, the rear end of the sheath tube is filled with an insulating powder inside the sheath tube together with an electric element and a sealing member is fitted inside the rear end side opening of the sheath tube. It is characterized in that the insulating powder leaking to the outside of the sheath tube is removed by the powder removing means when the compression diameter processing is performed for sealing the portion toward the sealing member for encapsulation.

Further, in the apparatus for manufacturing a sheathed type electronic device of the present invention, a hollow cylindrical tubular sheath tube having a front end side closed and a rear end side open, and an electric element arranged inside the sheath tube. And a conductive path forming body having one end connected to the electric element and the other end extending outward from the rear end side opening of the sheath tube, the sheath tube, the electric element, and the conductive path forming body. A rear end of the sheath tube, and an insulating powder filling a space between the rear end of the sheath tube and a sealing member fitted inside the rear end side opening of the sheath tube when the conductive path forming body is allowed to extend. A device for producing a sheath-enclosed electronic device in which insulating powder is enclosed together with an electric element in the hollow portion of the sheath tube by reducing the diameter and closely adhering the portion toward the sealing member,
To seal the rear end of the sheath tube toward the sealing member while the insulating powder is filled inside the sheath tube together with the electric element and the sealing member is fitted inside the rear end side opening of the sheath tube. A powder removing means is provided for removing insulating powder leaking out of the sheath tube when the compression diameter processing is performed.

According to the method and apparatus of the present invention, the insulating powder and the electric element are arranged inside the sheath tube, and the sealing member is fitted inside the rear end side opening portion of the sheath tube. When the compression-diameter processing of the rear end portion is performed, the processing is performed while the insulating powder leaking outside the sheath tube is removed by the powder removing means. As a result, even if the insulating powder leaks to the outside of the sheath tube, that is, the inside of the processing device, the insulating powder is quickly removed by the powder removing means, so that the insulating powder is not accumulated in the device and the clean state can be maintained constantly. As a result, it is possible to effectively suppress the problem that residual insulating powder bites into equipment parts such as processing tools,
The life of parts can be improved. In addition, productivity can be improved because the time required for cleaning can be greatly reduced.

It is desirable that the compression-diameter processing of the sheath tube is performed without lubricating the processed surface (that is, the outer peripheral surface) of the sheath tube with oil. Oil-lubricating the surface to be processed of the sheath tube is advantageous from the viewpoint of reducing the bite of the insulating powder that leaks into the tool, but the lubricating oil leaks into the sheath tube, causing a short circuit, etc. There is a drawback that it is likely to cause defects in. As a result, if oil lubrication is used to prevent powder bite, short-circuit defects due to lubricating oil leakage will increase, and if oil lubrication is not adopted and short-circuit defects are avoided, it will be difficult to avoid powder bite defects. It was However, if the present invention is adopted, the powder biting can be effectively prevented by adopting the powder removing means without using the oil lubrication, so that both of the problems which are conventionally in a trade-off relationship can be solved. It becomes possible. Note that it is necessary to perform at least the compression-diameter processing for sealing the sheath tube on the tube rear end portion where the sealing member is arranged. In this case, only the rear end of the tube may be processed, or the part other than the rear end may be additionally processed, for example, the entire length of the tube may be processed. In the latter case, the filled insulating powder is compressed by simultaneously reducing the inner space of the tube, and the insulation between the sheath tube and the electric element can be enhanced.

The powder removing means may be provided with suction means for sucking the insulating powder leaking into the sheathed tube compression and compression processing device. By doing this, the insulating powder can be reliably removed by suction,
Moreover, since the device configuration can be made relatively simple, there is a great cost advantage.

The above-mentioned compression-diameter processing can be carried out by rotationally forging the sheath tube in the circumferential direction.
Specifically, a plurality of forging tools (forging dies) that are held so that they can be displaced in the radial direction of rotation give a radial impact force to the sheath tube one after another in the circumferential direction to reduce the diameter.
It can be swaging for performing a stretching process.
In such a rotary forging process, a uniform diameter reduction process can be performed in the circumferential direction, and a high degree of sealing can be ensured. Further, as described above, when the insulating powder is compressed to secure insulation, it is necessary to reduce the diameter and stretch the sheath tube over substantially the entire length. In this case, it is essential to adopt rotary forging. . In any case, when the rotary forging process is adopted, the vibration applied to the sheath tube during the process is large, and the powder leakage is particularly likely to occur. Therefore, it can be said that the adoption of the present invention in which the processing is performed while removing the leaked powder is particularly effective.

In this case, the suction means may suction the insulating powder in the direction of the rotation axis of the forging tool used for rotary forging at the suction port facing the rear end side opening of the sheath tube. In rotary forging such as swaging, a sheath tube, which is a workpiece, is arranged on the rotation axis of a forging tool, and powder tends to leak from the rear end side opening of the sheath tube in the axial direction. Therefore,
As described above, when the suction port is opposed to the rear end side opening of the sheath tube and the insulating powder is sucked in the direction of the rotation axis of the forging tool, the powder can be removed more reliably.
This further reduces the amount of powder remaining in the device,
It is possible to more effectively eliminate the above-mentioned problems such as powder biting.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a glow plug to which the present invention is applied. In the glow plug 1, the sheath heater 30 forms the main part of the glow plug 1.
This is configured as a seeds-sealed electronic device manufactured by the manufacturing method of the present invention. Specifically, the sheathed heater 30 has a cylindrical sheathed tube 3 having a hollow shaft shape having a closed front end and an opened rear end, and a heating coil (a resistance heating heater) is provided inside the distal end of the sheathed tube 3. The element 6 and the control coil 5 (both the heating coil 6 and the control coil 5 correspond to electric elements) are arranged in series from the front side in this order. The control coil 5
Is connected to one end of the current-carrying terminal shaft 4 (conductive path forming body), and the other end extends outward from the rear end side opening of the sheath tube 3. In addition, the sheath tube 3 and the heating coil 6
In the space between the control coil 5 and the energizing terminal shaft 4,
Insulating powder 14 is filled. Furthermore, a sealing member 15 is fitted inside the rear end side opening of the sheath tube 3 in a state where the energizing terminal shaft 4 is allowed to extend. The rear end portion of the sheath tube 3 is subjected to compression compression processing described later toward the sealing member 15 to be in close contact with the sealing member 15, and the insulating powder 14 generates heat in the hollow portion of the sheath tube 3. It is enclosed together with the coil 6, the control coil 5, and the energizing terminal shaft 4.

A tubular metal shell 2 is arranged outside the heater 30, and a sheath tube 3 is provided inside the tip of the metal shell 2.
Are fixed by brazing or press fitting. The energizing terminal shaft 4 passes through the center of the metal shell 2 and the sheath tube 3
Has reached inside, and is electrically connected to the control coil 5 and the heating coil 6. In the embodiment, the control coil 5 is interposed between the energizing terminal shaft 4 and the heating coil 6 to indirectly connect the two, but the control coil 5 is not provided and the heating coil 6 and the energizing terminal shaft 6 are not provided. 4 may be directly connected (in this case, the heating coil 6 corresponds to an electric element).

A stepped hole 7 is formed at the upper end of the metal shell 2, and a bush-shaped insulating ring 8 fitted in the stepped hole 7 supports the upper part of the current-carrying terminal shaft 4 at the center of the metal shell 2. And the joint between the two is electrically insulated. Further, there is a gap between the stepped hole 7 and the energization terminal shaft 4, and the gap is closed by the O-ring 9.

On the other hand, a hexagonal bolt-shaped tool engaging portion 10 is provided on the outer periphery of the body portion at the upper end of the metal shell 2, and a male screw 11 for attaching to a diesel engine (not shown) is formed under the tool engaging portion 10. Has been done. A screw portion 12 for connecting a power cable (not shown) is formed on the top of the energizing terminal shaft 4, and a round nut 13 screwed into the screw portion 12 is formed.
The insulating ring 8 is pressed by.

Next, the sheath tube 3 is made of metal (for example, stainless steel or nickel alloy), and the insulating powder 14 filled therein is an insulating ceramic powder such as magnesia. Then, the rear end side opening of the sheath tube 3 is closed by the sealing member 15 as described above, and is sealed by the compression diameter processing of the sheath tube 3. Sealing member 1
Reference numeral 5 is made of a heat-resistant polymer material such as silicone rubber or fluororesin (fluororubber). In the present embodiment, the sealing member 15 is a kind of ring member or O-ring member having a through-hole 15a for the current-carrying terminal shaft 4 and having a square cross-sectional outer diameter shape, and is deformed in a sealing step described later ( The height and the thickness are set so that the contact length is, for example, 2.5 mm or more in consideration of the collapse. A heating coil 6 is connected to the bottom of the sheath tube 3 in the previous step by direct welding or tack welding, and the energizing terminal shaft 4 projects from the open end of the sheath tube 3. The rear end portion Zr including the threaded portion 12 of the energizing terminal shaft 4 is connected to the front end portion Zf having a round bar shape by welding after the sealing process of the sheath tube 3 is completed.

The sealing process is carried out as follows, for example. First, the control coil 5 and the heating coil 6 are arranged inside the sheath tube 3, and the energizing terminal shaft 4 (the front end portion Zf of the energizing terminal shaft 4 is hereinafter simply referred to as the energizing terminal shaft 4 in the sealing step) is attached. After the sealing member 1
Insulating powder 14 is filled in leaving a space for inserting 5 at the rear end. Next, the insulating powder 14 attached to the inner peripheral surface of the sheath tube 3 is completely removed. The inner peripheral surface of the sheath tube 3 corresponding to the sealing member 15 is thinned from the inside.

Next, the sealing member 1 is attached to the rear end of the energizing terminal shaft 4.
5, the sealing member 15 is inserted into the space of the sheath tube 3 as shown in FIG. Then, as shown in FIG. 2 (b), only the rear end portion 3 a of the sheath tube 3 is reduced in diameter by pressurizing / diametering by rotary forging such as swaging, which will be described later. Tighten toward the surface. Finally, as shown in Fig. 2 (c),
The entire sheath tube 3 is processed by compression forging by rotary forging until it has a predetermined size. At the time of completion of the compression and compression step, the axial contact length of the sealing member with respect to the sealed surface is, for example, 2.5 mm or more, preferably 3 mm.
The range is up to 6 mm.

The apparatus used in the compression and compression step will be specifically described below. The compression diameter step is performed using a swaging device (rotary forging device) 101 shown in FIG. 3 (side partial sectional view) and FIG. 4 (front partial sectional view). Figure 3
As shown in FIG. 3, the swaging device 101 is provided with a suction device 125 for suction-removing the insulating powder leaking to the outside of the sheath tube 3 when performing the above-mentioned compression-diameter working on the sheath tube 3. ing. As a result, the insulating powder leaked inside the device is quickly removed.
It is possible to effectively suppress the problem that the remaining insulating powder bites into the forging tool or the like. Further, it is not necessary to apply oil lubrication to the surface to be processed of the sheath tube 3, and an insulating powder filled to insulate the sheath tube 3 and the heating coil 6 in the sheath tube 3 during the compression and compression step. Since the lubricating oil does not soak into 14, the failure such as a short circuit in the sheath tube 3 due to the penetration of the lubricating oil is less likely to occur.

As the suction device 125, specifically, a vacuum suction device can be preferably used. In the present embodiment, FIG.
As shown in the cross section of FIG. 3, the processing operation body 103 is set with the sheath tube 3 and has a main function of forging.
From the vicinity of the suction device 125 to the suction device 125
Are formed in the same direction as the rotation axis O of the forging tool 107 (see FIG. 4) in the working body 103. The end of the suction / discharge path 120 faces the rear end side opening of the sheath tube 3 arranged in the processing operation body 103 (in other words, the axially forward side of the sheath tube to be inserted (here, it is inserted). The suction device 125 is located on the front side in the direction toward the inside of the device). In this way, by sucking in the same direction as the rotation axis O of the working body 103, the insulating powder leaked to the outside of the sheath tube 3 can be sucked effectively.

In the swaging device 101, the output shaft 127a (rotation axis is O2) of the motor 127, which serves as a rotational power source, is arranged at a position offset radially with respect to the rotation axis O of the forging tool. There is. Then, the rotational force generated on the output shaft 127a is transmitted to the forging tool via the rotation transmission mechanism 127b. In the present embodiment, the rotation transmission mechanism 127b includes timing pulleys (may be sprockets) 150 and 151 provided on the output shaft 127a and the drive shaft 109a of the striking drive rotating body 109, which will be described later, and the timings when the pulleys are rotated. Although it is constituted by the belt (may be a chain) 152, the invention is not limited to this, and for example, a gear type transmission mechanism can be used.

As described above, by offsetting the output shaft 127a of the motor 127 and the rotation axis O of the forging tool in the radial direction, the rotational power source of the forging tool can be eliminated from the extension of the rotation axis O. Therefore, the suction device (suction means) 125 can be rationally arranged by utilizing the empty space generated by the removal, and the swaging device 101 is compact in its entirety despite the addition of the suction device 125. it can. In this case, the suction port is arranged so as to face the rear end side opening of the sheath tube on the rotation axis O, and the suction device 125 sucks the insulating powder through the suction port. As a result, the distance between the suction device 125 and the suction port can be minimized, and the suction / discharge path 12 that continues linearly can be obtained.
Since suction can be performed via 0, a strong suction force with little loss can be obtained.

As shown in FIG. 4, the swaging device 1
In 01 (rotary forging device), the main part including the working body 103 is assembled to the frame 90. FIG. 5 is an enlarged view of the configuration of the main part of the sheath tube 3. The sheath tube 3 is arranged along the rotation axis O so that it can be approached and separated from each other in the rotation radius direction, and the rotation radius can be increased. The forging die 107b forming the inner end portion in the direction has a plurality of forging tools 107 in which the forging hammer 107a forming the outer end portion serves as a processing force application portion, and the forging die 107b forming the outer end portion in the same direction. Further, the tool carrier 1 that is arranged integrally with the forging tool 107 so as to be rotatable around the rotation axis O.
07c. The forging tool 107 and the tool carrier 107c form the working body 103. Also,
At the center of the working body 103, the forging die 107
An insertion portion 104 for inserting the sheath tube 3 is formed at the butting position of b.

The tool carrier 107c is a forging tool 107.
Has a tool holding portion 107h which holds the sheath tube 3 so that it can approach and separate from the sheath tube 3 in the radial direction of rotation. Then, the forging hammer 107a (working force applying portion) of the forging tool 107 held by the tool holding portion 107h projects to the outer peripheral surface of the tool carrier 107c by the rotational centrifugal force. In addition, the tool carrier 107c and the forging hammer 107a
And are connected by a pin 107d so that the forged hammer 107a can slide within a certain range in the radial direction of rotation.

A striking drive rotating body 109 is concentrically arranged outside the tool carrier 107c.
The striking drive rotary body 109 holds a plurality of striking action portions 105 on its inner peripheral surface in a protruding form, and is driven to rotate relative to the tool carrier 107c in the circumferential direction. Due to the relative rotation drive, the striking action portion 105 that sequentially arrives at the position of the forging tool 107, the tool carrier 10
A hammering working force in the radial direction is applied to the forging hammer 107a (working force applying portion) protruding from the outer peripheral surface of 7c. On the outer side of the striking drive rotary body 109, a forged casing portion 108 is concentrically and fixed to the striking drive rotary body 109 so that its inner peripheral surface faces the outer peripheral surface of the striking drive rotary body 109. It is arranged in a way.

In the present embodiment, the powder discharge path 111 formed in the inner peripheral surface of the forged casing 108 in a groove shape discharges the insulating powder leaking to the outside of the striking drive rotor 109. There is. As a result, it is possible to effectively remove the insulating powder that leaks into the forged casing portion 108, and particularly to effectively prevent biting and abrasion of the powder on the rear end surface of the forged hammer 107. When the powder discharge mode by the powder discharge path 111 and the powder suction-removal mode by the above-mentioned suction device 125 are combined, the powder-removing effect in the present invention becomes the most remarkable, but both modes are functionally independent. Because
It is possible to selectively implement only one. The powder discharge path 111 can independently constitute powder removing means even if the powder suction means is omitted.

It should be noted that the powder discharge passage 111 is formed on the inner peripheral surface 108a of the forged casing portion 108 in the direction of the rotation axis O.
Can be formed as a groove extending from one end edge to the other end edge. In this way, the removed powder can be easily collected on the end face side of the forged casing portion 108. As shown in FIG. 5B, the powder discharge passage 111 can be formed in a spiral shape on the inner peripheral surface 108a instead of being a groove parallel to the axis O. With this configuration, at each position on the axial direction O, the angular phase of the contact position between the impacting action portion 105 and the powder discharge passage 111 is shifted in the circumferential direction, and the powder discharge passage 111 becomes a step with respect to the impact action portion 105. It gets harder. As a result, the striking portion 105 can smoothly slide along the inner peripheral surface 108. In addition, as shown in a development view of the inner peripheral surface 108 in FIG. 5C, such a spiral powder discharge passage 11 is formed.
1 is formed in plural (in this embodiment, 2
It is also possible to remove the powder and discharge it more efficiently.

Further, in the present embodiment, the impact driving rotary member 1
Reference numeral 09 denotes a striking roller 105 that constitutes a striking portion, and a ring-shaped roller holder 109a that rotatably holds the striking roller 105 so as to expose the outer peripheral portion of the striking roller 105 to the inner and outer peripheral surfaces thereof. . Forged casing part 1
When the striking roller 105 rolls on the inner peripheral surface 108a of 08, the insulating powder leaked to the outside of the striking drive rotary body 109 moves along the inner peripheral surface 108a of the forging casing portion 108, and the powder discharge path. It is guided into 111. By rolling the striking roller 105, the effect of guiding and collecting the powder into the powder discharge path 111 is enhanced, and the powder discharge effect is further enhanced.

In the above structure, air supply means for supplying compressed air is provided in the powder discharge path, and the insulating powder in the powder discharge path 111 is transferred and discharged by the supply of the compressed air. Then, the powder discharging effect can be further enhanced. In the present embodiment, as shown in FIG. 3, the swaging device 101 is provided with an air supply means 140 composed of a compressor, and as shown in FIG. 6, the pressurized air from the air supply means 140 is It is ejected from the air outlet 141 at the tip via the air supply passage 142.
The pressurized air is also supplied into the powder discharge passage 111 by flowing between the striking drive rotary body 109 and the forged casing portion 108, and the insulating powder accumulated in the powder discharge passage 111 is transferred and discharged. . In this case, the air supply means is
For example, even if the powder suction means is omitted, the powder removing means can be configured together with the powder discharge path 111.

The embodiment of the present invention has been described above.
The present invention is not limited to this, and various modifications and improvements can be added based on the knowledge of those skilled in the art. The embodiment to which these modifications and improvements are added naturally belongs to the technical scope of the present invention unless it deviates from the scope of the claims. For example, the seeds-filled electronic device to which the present invention is applied is not limited to the glow plug heater as described above, but may be the fuse-type temperature sensor described above.

[Brief description of drawings]

FIG. 1 is a vertical half sectional view showing a glow plug as an example of an application target of the present invention.

FIG. 2 is an explanatory view showing a mounting process of a seeds-sealed sealing member included in a glow plug.

FIG. 3 is a side partial cross-sectional view showing an example of a swaging device.

4 is a front partial cross-sectional view of FIG.

5 is an enlarged front view of the main part of FIG.

6 is an enlarged view of a part of FIG. 4. FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 glow plug 3 sheath tube 4 energizing terminal shaft 6 heating coil 14 insulating powder 15 sealing member 30 sheath heater (seed enclosing type electronic device) 101 swaging device (rotating forging device) 105 striking roller 107 forging tool 108 forging casing part 108a Inner peripheral surface 111 Powder discharge passage 125 Suction mechanism 127 Drive motor 140 Air supply means O Rotation axis of forging tool O ₂ Rotation axis of drive motor

Claims (13)

[Claims] 1. A cylindrical sheathed tube having a hollow shaft shape having a closed front end and an opened rear end, an electric element arranged inside the sheathed tube, and one end connected to the electric element and the other end. A conductive path forming body arranged so as to extend outward from the rear end side opening of the sheath tube, and an insulation filling a space between the sheath tube and the electric element and the conductive path forming body. A powder and a sealing member fitted inside the rear end side opening of the sheath tube in a state where the conductive path forming body is allowed to extend,
For manufacturing a sheath-enclosed type electronic device in which the insulating powder is enclosed in the hollow portion of the sheath tube together with the electric element by reducing the diameter and closely adhering the rear end portion of the sheath tube toward the sealing member. The method is a state in which the sealing member is fitted inside the rear end side opening portion of the sheath tube while filling the insulating powder inside the sheath tube together with the electric element, and the rear portion of the sheath tube is provided. A sheath-enclosed type electronic device characterized in that the insulating powder leaking to the outside of the sheath tube is removed by a powder removing means when a compression diameter processing is performed for sealing the end portion toward the sealing member. Equipment manufacturing method. 2. The pressurizing diameter processing of the sheath tube,
The method for manufacturing a sheath-enclosed electronic device according to claim 1, wherein the surface to be processed of the sheath tube is not lubricated with oil. 3. The powder removing means having a suction means for sucking the insulating powder leaking into the apparatus is used in the compression diameter processing apparatus for the sheath tube. 2. The method for manufacturing a seeds-enclosed electronic device according to 2. 4. The compression-diameter processing is performed by rotationally forging the sheath tube in a circumferential direction.
4. The method for manufacturing a seeds-enclosed electronic device according to any one of items 1 to 3. 5. The suction means suctions the insulating powder in a direction of a rotation axis of a forging tool used for the rotary forging, at a suction port facing the rear end side opening of the sheath tube. 4. The method for manufacturing a seeds-enclosed electronic device according to item 4. 6. An output shaft of a rotary power source is arranged at a position offset in a radial direction with respect to a rotation axis of the forging tool,
A rotary forging device that transmits the rotational force generated in the output shaft to the forging tool via a rotation transmission mechanism is used, and it faces the rear end side opening portion of the sheath tube arranged on the rotation axis of the forging tool. The method for manufacturing a seeds-enclosed electronic device according to claim 5, wherein the suction port is arranged in such a manner that the suction means sucks the insulating powder through the suction port. 7. The rotary forging device is arranged such that it can be moved toward and away from the sheath tube arranged along the rotation axis in a radial direction of rotation, and an inner end portion in the radial direction of rotation is arranged. A plurality of forging tools that are processing acting parts for the sheath tube and also have outer ends as processing force imparting parts, and are arranged rotatably around the rotation axis line integrally with the forging tools. Each has a tool holding portion that holds the sheath tube so that it can approach and separate from the sheath tube in the rotation radius direction, and by the rotation centrifugal force thereof,
A tool carrier for projecting the processing force application portion of the forging tool held by the tool holding portion onto its outer peripheral surface, and a plurality of impacts arranged concentrically on the outer side of the tool carrier and on its inner peripheral surface. While holding a plurality of action portions respectively in a protruding form, the impact action portion that is rotationally driven in the circumferential direction relative to the tool carrier, and that sequentially arrives at the position of the forging tool by the relative rotational drive is the tool carrier. A striking drive rotating body that applies a striking working force in a radial direction to the working force applying portion projecting from the outer peripheral surface, and the striking drive rotating member such that its inner peripheral surface faces the outer peripheral surface of the striking driving rotating body. A forging casing part that is concentrically and fixedly arranged with respect to the body is used, and a powder discharge path as a powder removing means formed in a groove shape on the inner peripheral surface of the forging casing part. 7. The method for manufacturing a seeds-sealed electronic device according to claim 4, wherein the insulating powder leaking to the outside of the striking drive rotating body is discharged. 8. The striking drive rotating body and a striking roller forming the striking portion, and a ring rotatably holding the striking roller so as to expose the outer peripheral portion of the striking roller to the inner and outer peripheral surfaces thereof. And a roller holder in the shape of a forging casing, and the impact roller rolls on the inner peripheral surface of the forging casing, so that the insulating powder leaked to the outside of the impact driving rotary body is stored in the forging casing. The method for manufacturing a seeds-filled electronic device according to claim 7, wherein the seeds-filled electronic device is moved along a peripheral surface and guided into the powder discharge passage. 9. The powder discharge path is formed on the inner peripheral surface of the forged casing portion in a direction extending from one end side edge to the other end side edge in the rotation axis direction. Of manufacturing a seeds-enclosed electronic device. 10. The method for manufacturing a seeds-filled electronic device according to claim 9, wherein the powder discharge passage is formed in a spiral shape on an inner peripheral surface of the forged casing portion. 11. The seeds according to any one of claims 7 to 9, wherein pressurized air is supplied into the powder discharge path by an air supply means to transfer and discharge the insulating powder in the powder discharge path. Manufacturing method of encapsulated electronic device. 12. The sheathed-type electronic device is a glow plug heater in which at least a resistance heating element is arranged as the electric element in the sheath tube. Of manufacturing a seeds-enclosed electronic device. 13. A tubular sheath tube having a hollow shaft shape having a closed front end and an opened rear end, an electric element arranged inside the sheath tube, and one end connected to the electric element and the other end. And a conductive path forming member arranged so as to extend outward from the rear end side opening of the sheath tube,
Insulating powder filling the space between the sheath tube, the electric element, and the conductive path forming body, and a state in which the conductive path forming body is allowed to extend inside the rear end side opening of the sheath tube. A sealing member that is fitted into the sheathing tube, and the rear end portion of the sheathed tube is reduced in diameter and closely adhered to the sealing member so that the insulating powder is enclosed together with the electric element in the hollow portion of the sheathed tube. A device for manufacturing a seeds-enclosed type electronic device, wherein the sealing member is provided inside the rear end side opening of the sheath tube while filling the inside of the sheath tube with the insulating powder together with the electric element. In the fitted state, when the rear end portion of the sheath tube is processed toward the sealing member by the compression compression processing for the sealing, the leakage of the sheath tube from the sheath tube is prevented. A device for manufacturing a seeds-enclosed electronic device, comprising a powder removing device for removing edge powder.