JP2002197974A - Manufacturing method and device for stem of electron tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture an electron tube stem of high quality. SOLUTION: The leads 4 of an electron tube stem 1 and beads glass are set in a lower molding die 19 of a lower die head 11. A upper molding die 40 supported capable of idling in the direction intersecting the die opening/ closing direction with the lower die 19 and the lower die 19 are set closedly in an upper die head 12. By closing the upper die 40 and lower die 19, the upper die 40 capable of making idling is moved in follow-up to the relative position with the lower die 19 so that the location is established. The relative positioning of the lower die 19 and upper die 40 is determined correctly, and the upper die 40 is allowed to make follow-up in one-body after dislocation of the lower die 19 in the manufacturing process so that the intended electron tube stem 1 of high quality is manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a high-quality electron tube stem.

[0002]

2. Description of the Related Art In general, as shown in FIG. 5, an electron tube stem 1 of a glass tube has a stem pedestal 2, and an exhaust pipe 3 is formed at the center of the stem pedestal 2. A plurality of lead wires 4 are respectively fixed therethrough. One end of the lead wire 4 is an inner lead 4a and the other end is an outer lead 4b. The base end of the inner lead 4a is fixed by a fillet 5 integrated with the stem base 2.

[0003] The manufacture of such an electron tube stem 1 requires a plurality of lead wires and a stem pedestal 2 in a lower mold of a lower mold head arranged on an intermittently driven evening table.
After the bead glass forming the fillet 5 and the glass tube forming the exhaust pipe 3 are supplied, the lower die head is intermittently fed while rotating itself, preheated and heated by a burner and baked to mold the upper die head. By pressing the upper mold to the lower mold, the stem base 2 is made of bead glass.
In addition, the fillet 5 is formed, the exhaust pipe 3 is integrated, and the glass tube is heated by a burner to remove distortion of the glass, thereby forming the electron tube stem 1 shown in FIG.

[0004]

The quality of the electron tube stem 1 depends on the positioning of the relative positions of the lower mold and the upper mold during press molding. In addition, the wraparound of the glass is not uniform, and there are problems such as chipping of the fillet 5 of the introduction wire 4, leak failure, and uneven thickness of the base end portion of the exhaust pipe 3 connected to the stem pedestal 2. are doing.

When the electron tube stem 1 is manufactured, it is heated and melted by a burner, so that the temperature of the turntable on which the lower mold is disposed also rises and thermal expansion occurs, and the lower mold and the upper mold are heated. And a displacement occurs. Therefore, it is necessary to align the upper mold in accordance with the displacement of the lower mold, and fine adjustment is required. However, there is a problem that many defects occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is possible to reliably position a relative position between a lower mold and an upper mold, and to prevent a displacement of the lower mold during a manufacturing process. It is an object of the present invention to provide a method of manufacturing an electron tube stem and a device therefor, which can make a high quality electron tube stem.

[0007]

SUMMARY OF THE INVENTION According to the present invention, an introduction line of an electron tube stem and a bead glass are arranged on a lower mold of a lower mold head, and at least one of the upper mold head and the lower mold head is in a mold opening / closing direction. Close the upper mold and the lower mold movably supported in the direction intersecting with each other, and move the upper mold and the lower mold relatively to relative positions to form an electron tube stem. Things.

When manufacturing the electron tube stem, the introduction line of the electron tube stem and the bead glass are arranged in the lower mold of the lower mold head, and at least one of the upper mold head and the lower mold head is in the mold opening / closing direction. The upper mold half and the lower mold half supported movably in the intersecting direction are closed. By closing the mold upper mold and the mold lower mold, the mold upper mold and the mold lower mold relatively follow and move to the relative positions and are positioned, thereby forming the electron tube stem. In this way, the relative position between the lower mold and the upper mold is reliably positioned, and the upper mold integrally follows the displacement of the lower mold in the manufacturing process, thereby providing a high-quality electron tube. A stem is manufactured.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Components corresponding to the components described in the conventional example will be described with the same reference numerals.

FIGS. 2 and 3 show an apparatus for manufacturing an electron tube stem. The apparatus includes a lower die head 11 and an upper die head 12, and the lower die head 11 is installed at a plurality of positions on the periphery of a turntable 13 that is driven intermittently. The upper mold head 12 is supported above the rotational movement locus of the lower mold head 11 by a stand 14 standing on a fixed table (not shown) facing the periphery of the turntable 13.

The lower die head 11 is driven to rotate about a central axis 16 by a drive mechanism (not shown). A claw portion 18 constituting a synchronous rotation means 17 is provided on the side surface, and the electron tube stem 1 is provided on the upper portion. A mold lower mold 19 for forming the mold is provided. In the lower mold 19, as shown in FIG.
A hole 20 for passing the exhaust pipe 3 is formed at the center, a plurality of holes 21 for holding the introduction line 4 are formed around the hole 20, and as shown in FIGS. 2 and 3 (f). A plurality of reference holes 23 forming the positioning means 22 are formed near the peripheral edge.

A stand 14 for supporting the upper die head 12
Has a main body 25 disposed on a fixed table, and a slide shaft 26 is projected from the upper surface of the main body 25 so as to be able to advance and retreat in a vertical direction by a driving mechanism (not shown). The arm 28 is fixed. A housing 29 for rotatably supporting the upper die head 12 is attached to a tip portion of the arm 28. An adjusting screw 30 for adjusting the distance between the slide shaft 26 and the housing 29 is attached to the arm 28.

The upper die head 12 has a main shaft 31.
The main shaft 31 is rotatably supported on the housing 29 by a ball bearing 32 and a thrust bearing 33 so as to be rotatable only in a rotational direction about a center shaft 34.

A mounting member is provided near the lower end of the main shaft 31.
35 is attached to the mounting member 35, and a connecting rod 36 that can be engaged with the claw portion 18 of the lower die head 11 and constitutes the synchronous rotation means 17 together with the claw portion 18 is vertically protrudingly provided. Mounting part 37 is mounted.

At the lower end of the main shaft 31, an upper mold 40 is connected via a friction mechanism 39 to a lower mold 19.
It is mounted movably in a direction intersecting with the mold opening and closing direction, that is, in a horizontal direction.

In the friction mechanism 39, the main shaft
A plurality of steel balls 42 that receive a thrust load are arranged on a flange portion 41 protruding from the lower edge of the base 31 and an annular pedestal case 43 is covered.A plurality of upper molds 40 are provided on the lower surface of the pedestal case 43. Bolt 44. Since a gap is provided between the outer peripheral surface of the main shaft 31 and the inner peripheral surface of the pedestal case 43, the upper mold 40 is supported movably in the horizontal and rotational directions with respect to the main shaft 31. I have.

In the present embodiment, regulating grooves 45 are formed at a plurality of locations on the peripheral edge of the pedestal case 43, and at four equally spaced locations on the circumference in the present embodiment.
A plurality of restriction pieces 46 projecting from 41 are movably entered, and the movement of the upper mold 40 relative to the main shaft 31 is within a range in which the restriction pieces 46 can freely move in the respective restriction grooves 45. It is regulated within a predetermined range.

On the lower surface of the upper mold 40, a lower mold is provided.
A plurality of guide pins 48 are provided so as to be able to advance and retreat corresponding to the positions of the plurality of reference holes 23 of 19, and these guide pins 48 are urged by compression springs 49 in the direction of projecting downward.

On the lower surface of the upper mold 40, a convex forming portion for forming a base end portion which is continuous with the stem base 2 of the exhaust pipe 3 at the center.
51 are projected, and each fillet 5
Are formed.

An introduction wire insertion hole 54 and a pin insertion hole 55 are formed above each concave molding portion 52 of the upper mold 40. The main shaft 31 is positioned corresponding to the position above each of the pin insertion holes 55.
Are formed with a plurality of pin insertion holes 56, and each of the pressing pins 57 abutting on the upper end in the axial direction of the lead-in wire 4 arranged in the lower mold of each of the pin insertion holes 55, 56 is vertically movable. Are located. Hooks 58 are attached near the upper ends of the pressing pins 57 protruding from the main shaft 31, and the hooks 58 are attached to these hooks 58 below the hooks 58.
A tension spring 60 as an urging means is stretched between a stopper 59 fixed to the outer peripheral surface of the spring. The pressing pin 57 and the tension spring 60 constitute the lead wire pressing means 61.

At the upper end of each pressing pin 57, a detecting piece 63 constituting detecting means 62 is attached in a radial direction about the central axis 34. A sensor holder 65 is attached to the housing 29 by a stand 64 so as to surround the detection piece 63 at the upper end of the pressing pin 57. The sensor holder 65 is provided with a light emitter and a light receiver constituting the detection means 62. A plurality of pairs of photoelectric sensors 66 are mounted. In these photoelectric sensors 66, the sensor light is in a translucent state at the time of normal or normal, and when the pressing pin 57 abnormally floats, the sensor light is shielded by the floating detection piece 63, and the abnormality is detected. Each of the detection pieces 63 is provided so as to be able to detect the lift thereof.

Further, a band brake 68 is attached to the main shaft 31 of the upper die head 12 to provide resistance so that the main shaft 31 does not rotate when the rotation is transmitted from the lower die head 11.

Next, a method of manufacturing the electron tube stem 1 will be described.

The evening table 13 is intermittently driven to rotate, and at the initial rotation position of the process, a plurality of lead wires 4, stem bases 2 and fillets 5 are formed on the lower mold 19 of the lower mold head 11. The glass 2a and the glass tube constituting the exhaust pipe 3 are supplied, and at the next rotation position, the lower mold head 11 is preheated and heated by a burner while being rotated by itself, and baked.
At the next rotation position, as shown in FIG.
Is supplied below the upper die head 12.

As shown in FIG. 1B, the stand 14 lowers the connecting rod 36 of the upper die head 12 to an intermediate position where the connecting rod 36 overlaps the claw portion 18 of the lower die head 11. At this intermediate position height, each guide pin 48 protruding from the upper mold 40 is located above the lower mold 19. Then, the claw portion 18 of the self-rotating lower mold head 11 is engaged with the connecting rod 36, and the upper mold head 12 is positioned relative to the lower mold head 11 at a position relative to the mold lower mold 19, and the rotation of the lower mold head 11 is performed. The force is transmitted to the upper die head 12 to rotate synchronously. When the upper mold head 12 and the lower mold 19 of the lower mold head 11 are positioned relative to each other, each guide pin 48 protruding from the upper mold 40 faces above the reference hole 23 of the lower mold 19. Position.

As shown in FIG. 1C, the upper die head 12 is further lowered while the upper die head 12 and the lower die head 11 are rotated synchronously. As a result, first, the upper mold 40
Each guide pin 48 projecting from the mold enters each reference hole 23 of the lower mold 19 and the friction mechanism
Upper mold that is movably supported in the horizontal direction by 39
40 follow the relative position to the lower mold 19 and are positioned with respect to each other. For example, as shown in FIG. 4, before each guide pin 48 enters each reference hole 23 of the lower mold 19, the upper die head 12 and the upper mold 40 shown in FIG. If the relative positions of the upper mold 40 and the lower mold 19 in the rotational direction are deviated, FIG.
As shown in FIG. 5, the upper mold 40 is rotated with respect to the upper head 12 so that the upper mold 40 follows the relative position with respect to the lower mold 19.

After the upper mold 40 and the lower mold 19 are positioned at the relative positions, the upper ends of the introduction wires 4 arranged on the lower mold 19 are securely inserted into the respective insertion holes 54 of the upper mold 40. Be entered.

When the upper mold 40 and the lower mold 19 are closed, the upper end of the bead glass 2a and the exhaust pipe 3 is pressed between the upper mold 40 and the lower mold 19 to form the stem base 2. Then, the press pedestal 2 and the exhaust pipe 3 are integrated, and each fillet 5 for holding each lead wire 4 is formed from the stem pedestal 2.

When the upper mold 40 and the lower mold 19 are closed, the upper end of each lead wire 4 and each pressing pin of the upper mold head 12 are closed.
The lower ends of the guide lines 57 come into contact with each other, and the respective guide lines 4 are pressed downward by the urging of the tension springs 60 applied to the respective pressing pins 57, thereby regulating the lifting of the respective guide lines 4 during molding. In addition, introduction line 4
When is lifted against the pressing of the pressing pin 57, the detecting piece 63 moves up together with the pressing pin 57 to block the sensor light of the photoelectric sensor 66, so that the abnormality of the introduction wire 4 is detected, and the failure determination is made. it can.

When the electron tube stem 1 is manufactured, it is heated and melted by a burner.
The temperature of the turntable 13 is also increased and thermal expansion occurs, and the lower mold 19 is displaced in the outer diameter direction of the turntable 13, but according to the displacement of the lower mold 19, The upper mold 40 supported movably moves in an integrated manner, so that the relative positioning between the upper mold 40 and the lower mold 19 can be maintained.

As described above, the upper mold head 40 supports the upper mold 40 so as to be movable in the direction intersecting the opening and closing direction of the lower mold 19 with the upper mold 40. By closing the mold with the mold 19, the upper mold 40 is moved and positioned to follow the relative position with respect to the mold lower 19, and the electron tube stem 1 is molded. Therefore, the relative position between the mold upper mold 40 and the mold lower mold 19 is changed. The positioning can be performed reliably, and the upper mold 40 can be made to follow the displacement of the lower mold 19 in the manufacturing process, so that the high quality electron tube stem 1 can be manufactured.

Further, in the process of closing the upper mold 40 and the lower mold 19 and before moving the upper mold 40 to follow the relative position with respect to the lower mold 19, the synchronous rotating means 17 rotates the upper mold 40. Since the mold head 12 is positioned at a position relative to the lower mold 19 and is rotated in synchronization with the rotation of the lower mold 19, the upper mold 40 and the lower mold are rotated.
The mold can be reliably closed at a relative position with 19.

A pressing pin 57 movably arranged in the axial direction of the upper die head 12 is moved by an introduction line pressing means 61 to the axial end of the introduction line 4 arranged in the lower mold 19. Since the contact wire is pressed in contact, the lifting of the introduction wire 4 during molding can be reliably prevented.

Further, since the detecting means 62 detects the axial movement position of the pressing pin 57, it is possible to detect an abnormality of the introduction line 4 and to judge a defect.

In the above embodiment, the upper die head 12
The upper mold 40 of the mold is supported movably in the horizontal direction crossing the mold opening and closing direction, but the lower mold 19 of the lower mold head 11 is movably supported in the horizontal direction crossing the mold opening and closing direction. Alternatively, both the upper mold half 40 and the lower mold half 19 may be supported movably in a horizontal direction intersecting with the mold opening and closing direction, and the same operation and effect can be obtained.

[0036]

According to the present invention, at least one of the upper mold head and the lower mold head is supported movably in a direction intersecting the mold opening / closing direction. By closing, the upper mold and the lower mold are moved relative to the relative position and positioned to form the electron tube stem, so that the relative position between the lower mold and the upper mold can be reliably positioned, The upper mold can be made to integrally follow the displacement of the lower mold in the manufacturing process, and a high quality electron tube stem can be manufactured.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a method and apparatus for manufacturing an electron tube stem according to the present invention.
It is explanatory drawing explaining in order of (a)-(c).

FIG. 2 is a side view in which a part of a manufacturing apparatus of the electron tube stem is sectioned.

FIGS. 3A and 3B show an upper die head of the electron tube stem manufacturing apparatus, wherein FIG. 3A is a plan view, FIG. 3B is a BB sectional view, FIG. 3C is a CC sectional view, and FIG. D sectional view, (e) is EE sectional view, (f) is FF sectional view.

4A and 4B show a friction mechanism of the electron tube stem manufacturing apparatus, wherein FIG. 4A is a cross-sectional view, and FIG. 4B is a cross-sectional view rotated by a predetermined angle with respect to FIG.

FIG. 5 is a sectional view of a general electron tube stem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electron tube stem 4 Lead wire 11 Lower die head 12 Upper die head 17 Synchronous rotation means 19 Mold lower die 22 Positioning means 39 Friction mechanism 57 Press pin 60 Tension spring as biasing means 61 Lead wire pressing means 62 Detecting means

Claims (8)

[Claims] 1. An introduction line of an electron tube stem and a bead glass are arranged in a lower mold of a lower mold head, and at least one of the upper mold head and the lower mold head can move in a direction intersecting the mold opening / closing direction. Closing the upper mold and the lower mold supported by the mold, moving the upper mold and the lower mold relatively to relative positions, and forming an electron tube stem. Production method. 2. A process in which the lower mold is rotated about the central axis of the lower mold, and the upper mold and the lower mold are closed in a process of closing the upper mold and the lower mold. 2. The method of manufacturing an electron tube stem according to claim 1, wherein the upper mold head is positioned at a position relative to the lower mold and rotated in synchronization with the rotation of the lower mold before the relative follow movement. 3. A pressing pin disposed movably in the axial direction of the upper die head and pressed against an axial end of an introduction wire disposed on the lower mold. A method for manufacturing an electron tube stem according to claim 1. 4. The method for manufacturing an electron tube stem according to claim 3, wherein an axial movement position of the pressing pin is detected. 5. A lower mold head having a lower mold in which a lead wire of an electron tube stem and a bead glass are arranged; an upper mold head having a lower mold and a mold upper mold for closing a mold to form an electron tube stem; A friction mechanism for supporting at least one of the upper mold and the lower mold movably with respect to the upper mold head and the lower mold head in a direction intersecting the mold opening and closing direction; and the mold lower mold and the mold upper mold. And a positioning means for relatively moving the upper mold and the lower mold relative to the relative position when closing the mold. 6. The mold lower mold rotates around the central axis of the mold lower mold, in the process of closing the mold upper mold and the mold lower mold, and at a relative position between the mold upper mold and the mold lower mold. 6. A synchronous rotation means for positioning the upper mold head at a position relative to the lower mold before rotating the upper mold head relative to the lower mold and synchronously rotating the lower mold with the rotation of the lower mold. Manufacturing equipment for electron tube stems. 7. A pressing pin which is movable in the axial direction of the upper die head and abuts on an axial end of an introduction wire disposed on the lower mold, and the pressing pin is connected to the lower die by using the pressing pin. 7. An apparatus for manufacturing an electron tube stem according to claim 5, further comprising an introduction line pressing means having an urging means for urging in the direction of. 8. An apparatus for manufacturing an electron tube stem according to claim 6, further comprising a detecting means for detecting an axial movement position of the pressing pin.