JPH0230439Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an apparatus for producing a flexible wire for thermal spraying made of powder or granules of metal such as ceramic or cemented carbide.

[Conventional technology and its problems]

Since ceramics, cemented carbide, etc. do not have flexibility, thermal spraying of these materials is performed using a powder method. In this powder method, the ceramic or metal powder/granules are supplied to the tip of the nozzle of a thermal spray gun, and the powder/granules are melted and sprayed onto the object to be thermally sprayed using a high-temperature jet air stream ejected from the spray gun. However, in this case, a device is required to feed the powder and granules, which are the thermal spray materials, to the thermal spray gun, and the distance that the powder and granules can be sent from that device is limited, so it is not possible to work far away from the device. . Thermal spray efficiency is also unfavorable.

For this reason, instead of using powder or granules, they are made into rod shapes and are supplied by Norton Corporation in the United States under the trade name "ROKIDE", which enables rod-type thermal spraying. This is made by firing ceramic powder into a rod shape, and since it is not flexible, it is difficult to manufacture a long one and wind it into a bobbin or coil shape. There are problems such as not being able to work continuously.

Therefore, the present inventors formed a paste-like core material into a linear shape by kneading a thermal spray material made of powder or granules of ceramic, metal, or both, a binder, and a desiccant agent with water. invented a wire rod for thermal spraying, in which the outer periphery of the core is coated with a paste-like jacket material made by kneading a binder and a preservative with water to volatilize water. This product has flexibility due to the presence of a desiccant agent and can be wound into a bobbin or coiled, allowing continuous thermal spraying work.

[Purpose of invention]

The object of this invention is to provide an apparatus capable of manufacturing the above-mentioned flexible wire for thermal spraying.

[Means to achieve the purpose]

In order to achieve the above object, in this invention, a thermal spraying wire core container equipped with a ram having an air vent valve is inserted into a cylindrical base with a conical bottom inner surface from above, and the lower part of this container is A conical core die is fixed to the base, and a gap is formed between the outer surface of the die and the inner surface of the bottom of the base, and horizontal flanges are provided on the base and the container, facing each other with a gap between them. A bolt is screwed between both flanges so that the gap can be adjusted by screwing the bolt, and the base is provided with a thermal spraying wire outer sheath that communicates with the gap and has an air vent valve inside. The container is fixed, and an outer cover die having a gap continuous with the gap between the core die and the core die is provided at the lower part of the base, and this die is attached to the periphery of the die holder. It is supported by radial bolts provided at equal intervals in the direction.

[Effect]

The device constructed in this way first uses bolts to widen or narrow the gap between the flanges to adjust the gap between the base and the core die to the required value, and also uses bolts to adjust the outer die to the same die as the core die. Adjust so that it is on the axis.

Next, the paste-like core material is stored in the core container, the paste-like outer covering material is stored in the outer covering container, and the core material and outer covering material are pushed out from each die by the rams of both containers. A rod-shaped core is extruded from the material into a jacket container and then passed through the die. When this core passes through a jacketing die, a jacketing material is extruded from the die to cover the outer periphery of the core. In this way, a wire for thermal spraying is continuously produced, in which a core made of powder or granular material such as ceramic is coated with an outer covering material.

During this manufacturing process, the air inside the container is removed by the air release valve, so that no air is mixed into the extruded core and jacket.

Note that examples of the ceramic include one or a mixture of two or more of alumina, titania, zirconia, magnesia, silica, calcia, yttoria, tungsten carbide, chromium carbide, and the like.

Further, examples of the metal include one or a mixture of two or more self-fluxing alloys in which B and Si are added to a Ni-based, Ni-Cr-based, or Co-based cemented carbide.

Here, magnesia, calcia, and ittria are often used as stabilizers for sprayed surfaces, and for example, a stable and hard sprayed surface can be obtained by using zirconia and calcia. Furthermore, when using eutectic ceramic, it is possible to obtain a material with a lower melting point than that of a single material.

Powders and granules can be used arbitrarily in the range of 10 to 100μ, but if the diameter is small, the rate of material scattering during thermal spraying will be high, but the sprayed surface will be smooth and the pores will be small; This reduces the scattering rate of the material, improves adhesion strength and workability, but on the other hand,
Since the sprayed surface is rough and the pores are large, it is best to take these into consideration when selecting a material according to the purpose of use.

The above-mentioned binder and desiccant agent need to be volatilized by thermal energy during thermal spraying, and the thermal energy generates reactive solids, which fly together with thermal spraying materials such as ceramics and mix into the thermal spraying surface. Examples of binders include sodium cellulose glycolate, ethyl cellulose,
Examples include cellulose derivatives consisting of one or a mixture of two or more of hydroxyethyl cellulose and carboxymethyl cellulose, and examples of desiccant agents include glycerin.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

As shown in the figure, a cylindrical base 1 with a conical bottom inner surface.
The core container 2 is inserted into the core container 2.
A conical core die 3 is fixed to the lower part of the above 2, and when the ram 4 is lowered, the core material a in the container 2 is extruded from the center hole 5 of the die 3 in the form of a rod.

A gap 6 is formed between the base 1 and the lower part of the container 2 and the outer surface of the die 3 by recessing the base 1 side. The gap is adjusted by adjusting the amount of screwing.

In the lower part of the base 1, outer covering dies 8 are provided via a die holder 9 with a gap continuous to the void 6 between them and the core die 3, and the casing dies 8 are arranged at equal intervals in the circumferential direction of the holder 9. The center hole 11 of the die 8 is positioned on the same axis as the hole 5 of the die 3 by adjusting the screwing amount of the bolt 10 provided in the die 3. This hole 11 is formed to have a larger diameter than the hole 5.

A jacket container 12 that communicates with the gap 6 is provided on the side of the base 1, and when the ram 13 is lowered, the jacket material b in the container 12 passes through the gap 6 and passes through the hole 11 of the die 8. The outer surface of the rod-shaped core a' extruded from the hole 5 is coated.

In addition, in the figure, 14 is an air vent valve.

The embodiment is configured as described above, and first,
Core material a is ceramic, 100 parts by weight, binder, 2.5
~5 parts by weight, desiccant agent, 1.5 to 3 parts by weight were kneaded with water to form a paste, and the outer cover material b was:
A paste obtained by kneading 3 to 8 parts by weight of a binder and 1 to 3 parts by weight of a desiccant agent with water is filled into the containers 2 and 12, respectively, and when the rams 4 and 13 are lowered, the die 3 A rod-shaped core a′ is extruded from the When this core a' passes through the die 8, the outer covering material b is extruded from the die 8 and is coated on the outer surface of the core a', and the outer covering material b' is coated on the core a' made of ceramic powder and granules. Thermal spray wire material A is continuously produced.

[Effect of idea]

As explained above, according to this invention, it is possible to easily and continuously obtain a flexible long wire for thermal spraying, thereby easing restrictions on the location of thermal spraying work, and It enables thermal spraying for a long time and greatly improves productivity and workability, so it has extremely high industrial value.

Further, since the bolts enable adjustment between the base and the dice and between both dice, the operation is easy.

Furthermore, since the ram is provided with an air release valve, air does not get mixed into the extruded core and sheath, making it possible to obtain a high-quality wire.

[Brief explanation of the drawing]

The drawing is a longitudinal cross-sectional view of an embodiment of the apparatus for manufacturing ceramic wire for thermal spraying according to this invention. 1... Base, 2... Core container, 3...
Core die, 4... Ram, 8... Outer covering die, 12... Outer covering container, 13... Ram, a
...Core material, b...Outer cover material, b'...Outer cover, A...
Wire rod for thermal spraying.

Claims (1)

[Scope of utility model registration request] An air vent valve 1 is attached to a cylindrical base 1 whose bottom inner surface is conical.
A wire core container 2 for thermal spraying containing a ram 4 having a diameter of 4 is inserted from above, and a conical core die 3 is fixed to the lower part of the container 2. A gap 6 is formed between the base 1 and the container 2, and the base 1 and the container 2 have horizontal flanges 15a and 15b, respectively.
are provided facing each other with a gap between them, and a bolt 7 is screwed between the flanges 15a and 15b so that the gap 6 can be adjusted by screwing the bolt 7. A wire jacket container 12 for thermal spraying, which communicates with the core die 3 and has an air vent valve 14' therein, is fixed therein, and a gap continuous with the gap 6 is provided at the lower part of the base 1 between the core die 3 and the core die 3. A jacketing die 8 is provided via a die holder 9, and this die 8 is
A wire manufacturing device for thermal spraying is supported by radial bolts 10 provided at equal intervals in the circumferential direction of a die holder 9.