JPS62143362A - Manufacture of flat type filament - 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 (Industrial Application Field) The present invention relates to a method for manufacturing flat columnar filaments used in automobile headlights and the like.

(Prior art) In order to manufacture flat columnar filaments, as shown in FIG.
The molybdenum wire b and the rectangular mandrel C are then wound in a flattened spiral shape, sandwiched in this state between tungsten plates d, set in a hydrogen furnace, and the molybdenum wire b and rectangular mandrel C are melted. It's about to be completed.

(Problems to be Solved by the Invention) According to the conventional manufacturing method described above, the process is complicated and difficult to automate, and it requires the use of molybdenum wire and molybdenum mandrel, and a process of melting these afterwards. ,When coiling with a square mandrel, the back tension of the tungsten wire is not constant, causing corrosion (-crowding disorder).Currently, the temperature of the hydrogen furnace is limited to about 170,000, and the setting is not perfect. However, there were various problems such as the fact that the foot molding after setting was easy to break.

This invention was made to technically solve these problems, and it is possible to automate and simplify the process, and to manufacture flat columnar filaments with perfect setting, good coiling condition, and excellent quality. It is intended to provide a method.

(Means for Solving the Problems) As a means for solving these problems, the present invention provides a method for rotating tungsten wires while rotating two parallel pin-shaped mandrels so that the centers of these mandrels serve as rotational axes. The gist is a manufacturing method in which a filament is wound into a flat helical shape to form a filament having legs at both ends, an electric current is applied to this filament in an inert gas atmosphere, the filament is set, and one of the mandrels is moved to extract the filament. It is something to do.

It also adjusts the tension of the tungsten wire when the tungsten wire is wound in a flat helical shape using two parallel pin-shaped mandrels.

(Example) Next, an example of the present invention will be described in more detail with reference to the drawings. In FIG. 2, reference numeral 1 denotes a rotating section driven by a motor 2, in which a mandrel moving lever 3 and a wire chuck lever 11 are provided facing each other on the outer periphery. A pin-shaped mandrel 5 is attached to the tip of the mandrel moving lever 3, and the rotating part 1
The mandrel 5 is arranged symmetrically and parallel to the pin-shaped mandrel 6 fixed to the tip protruding part 1a of the rotating part 1, with the rotation axis X of the rotating part 1 in between. 6 so that the gap between them narrows. The wire chuck lever 4 is
A presser piece 4a is provided at the tip so that the tip of the tungsten wire 7 can be pressed and fixed against the notch 1b of the protrusion 1a, and when the lever 4 is pushed back against the spring 8, the tungsten wire 7 can be removed.

9 is a mandrel guide, which has holes 9a and 9b that fit into the parallel pin-shaped mandrels 5 and 6;
This allows it to slide along the rotation axis X. Reference numeral 11 denotes a tungsten wire feeding device, which includes a motor 12 for lateral feeding (horizontal feeding) and a motor 13 for foot forming, so that the tungsten wire 7 is fed out via a spool 14 and a nozzle 15. 16
is an electromagnetic magnet for tension adjustment provided in connection with the spool 14.

In order to manufacture the desired filament using such a device, first, the traverse feed motor 12 is driven to move the supply device 11, and the tip of the tungsten wire 7 is moved to the rotating part by the chuck lever 4. 1 (Figure 1 (a)). Next, the foot forming motor 13 is driven to move the feeding device 11 in the direction A shown in the figure, thereby forming the foot on the starting side of the fist. After that, the motor 10 is driven to move the mandrel guide 9 forward, and the mandrels 5 and 6 are inserted into the holes 9a and 9b.
mating with each other.

Then, the motor 2 is driven to rotate the rotating part 1,
At the same time, the tungsten wire 7 is fed out at a constant speed while the feeding device 11 is moved by the transverse feed motor 12, and the tungsten wire 7 is fed by the mandrels 5 and 6 while the mandrel guide 9 is also moved by the motor 10 in accordance with the tungsten wire. Wrap it in a spiral (Figure 1 middle)). In this coiling process, at the beginning of winding the tungsten wire 7, the speed is slowly changed and the tension of the tungsten wire 7 is weakened by the action of the magnet 16, and at the intermediate stage, the speed and tension are kept constant, and at the end of the winding. In this stage, the speed is slowed down and the tension is applied strongly. This is to maintain the back tension of the tungsten wire 7 constant, to prevent excessive tension from being applied to the tungsten wire, to prevent it from becoming loose, and to prevent irregular winding. Further, due to the elasticity (springback) of the tungsten wire 7, the number of turns is reduced compared to the number of turns actually wound, so the wire is wound extra in anticipation of this amount of unwinding. The amount of unwinding varies depending on the type, coiling conditions, wire material, etc., but for example, for a 65W automobile headlight, a 20-turn wire will rewind about 1.5 turns.

After this coiling, the feeding device 1 is
1 in the direction B shown in the figure to form the leg on the end of winding (Figure 1 (c)). The filament not only springs back during coiling, but also deforms due to internal distortion of the coiling after coiling and before actual use.
Coiling and leg shaping should be performed with these amounts of deformation taken into account in advance. This amount of deformation is determined by the coiling conditions,
Appropriate adjustment is required since it varies depending on the material of the wire, etc.

After coiling, a setting process is performed to prevent the flat filament from twisting. In the case of this invention, the tungsten wire 7 is
Setting is done by cutting the filament at a predetermined point and passing current from the power source Q through the flat filament in an inert gas atmosphere P (see Fig. 1).

After this setting, the mandrel guide 9 is returned and removed from the mandrels 5 and 6, and the mandrel moving lever 3 is activated to move the mandrel 5 to the mandrel 6 side as shown in FIG. Open the chuck lever 1 against the spring 8 (thereby, the flat filament can be removed).

(Effects of the Invention) As explained above, according to the present invention, two parallel pin-shaped mandrels are used to wind the filament in a spiral shape, and then the filament can be pulled out by moving one of the mandrels. Unlike the conventional method, the melting of a molybdenum mandrel and the primary winding of molybdenum are no longer necessary, making it possible to simplify the manufacturing process and reduce costs.

In addition, the manufacturing process can be automated, the pack tension during coiling can be controlled to be constant, and setting can be done perfectly at a temperature that matches the tungsten wire, resulting in high dimensional accuracy and minimal deformation. It is possible to produce flat filaments of excellent quality.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the method of the present invention in the order of steps, FIG. 2 is a schematic perspective view of the main parts of the apparatus, and FIG. 3 is an explanatory diagram showing the conventional method in the order of steps. ■...Rotating part, 2...Motor, 3...Lever for mandrel movement, 4...
...Lever for wire chuck, 5.6...
Pin-shaped mandrel, 7... Tungsten wire, 8... Spring, 9... Mandrel guide, 10... Motor, 11... Tungsten Wire supply device, 12.
...Motor for horizontal feed, 13...Motor for leg forming, 14...Susol, 15...
Nozzle, 16... Magnet for tension adjustment. 1st t! 1

Claims (2)

[Claims] (1) While rotating two parallel pin-shaped mandrels with the centers of these mandrels serving as the rotation axis, a tungsten wire is wound in a flat helical shape to form a filament with legs at both ends. 1. A method for producing a flat columnar filament, which comprises setting the filament by applying an electric current in an inert gas atmosphere, and then moving the one mandrel and extracting the filament. (2) The method for manufacturing a flat columnar filament according to claim 1, characterized in that the tension of the tungsten wire is adjusted when the tungsten wire is wound in a flat helical shape around the two parallel pin-shaped mandrels. .