JPS5827006Y2 - Wire annealing equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a continuous annealing apparatus for bare metal wires, and particularly to an indirect heating type bright annealing apparatus.

Since metal wire drawn from a wire drawing machine or the like is hardened due to processing distortion, it is usually annealed before use.

In this case, there is a method of heating the metal wire by applying current to it, but since there is a problem with contact current application using a current-carrying pulley, etc., an indirect heating type annealing method is generally used.

That is, the drawn-out metal wire is continuously passed through a wire passage pipe heated by a heating element to indirectly heat and anneal it.

At this time, if the wire passing pipe is filled with inert gas or steam, so-called bright annealing is performed, and the wire becomes in a state suitable for plating or coating work.

FIG. 1 is a sectional view of a conventional wire annealing furnace.

A plurality of horizontally parallel wire passing pipes 2 are filled with water vapor, through which the wire 1 continuously passes at an appropriate speed.

A plurality of heating elements 5 are installed below the wire passing pipe 2 with an air layer 3 interposed therebetween.
The heating element 5 is housed in an annealing furnace 10 that is lined with a heat insulating material 6 and integrally formed with an exterior plate.

Therefore, the heat of the heating element 5 is transferred to the wire passing pipe 2 through the air layer 4 by radiation and convection, and the wire is annealed by heating the steam layer 3 in the wire passing pipe 2. As shown in the figure, the annealing furnace has a rectangular cross section, so it has a large internal volume and a large area for heat radiation to the outside.

Therefore, a large amount of energy must be supplied to the heating element 5 in order to heat the wire passing pipe 2 to a required temperature.

Further, in order to uniformly heat the inside of the annealing furnace 10, the heating elements 4 must be arranged in a dispersed manner, so that the structure of the annealing furnace 10 becomes complicated.

The purpose of the present invention is to provide a wire annealing device with a simple structure and high thermal efficiency.The feature is that the heating element is a single rod-shaped heating element, and the heating element is arranged in parallel around the heating element. The structure consists of a plurality of wire passing pipes, which are surrounded by a cylindrical heat insulating layer.

Figure 2 is a front view of a wire annealing furnace which is an embodiment of the present invention;
FIG. 3 is a sectional view taken along the line AB in FIG. 2, and the same parts as in FIG. 1 are designated by the same reference numerals.

In FIG. 2, a plurality of wire rod passing pipes passing through an annealing furnace 10 have both ends protruding, and each wire rod passing pipe 2 is introduced and filled with water vapor, and the wire rod 1 is continuously passed therethrough.

In FIG. 3, the rod-shaped heating element 5 is replaced by a cylindrical annealing furnace 10.
A cylindrical interior plate 11 surrounds the outside of a large number of wire passage pipes 2 in parallel with the heating element 5, and the interior plate 11 and the exterior plate 7 are connected to each other. A heat insulating material 6 is filled in between.

Note that the wire passing pipe 2 and the interior plate 11 are made of stainless steel.

The annealing furnace 10 configured in this manner has a cylindrical shape, and since the heating element 5 is installed in the center thereof, its internal volume and heat radiation surface area are significantly reduced.

Therefore, even if the electric power supplied to the heating element 5 is small, the wire passing pipe 2 can be maintained at a predetermined temperature, and the time required to raise the temperature of the annealing furnace 10 can be shortened, thereby improving work efficiency.

In addition, the interior plate 11 and the exterior plate 7 can be made by bending a large metal tube or metal plate, so they are easy to manufacture.
Unlike the conventional annealing furnace 10 with a rectangular cross section, it is not necessary to bend large plates at right angles or to combine plates, so it can be manufactured at low cost.

In addition, since the wire rod passage pipe 2 is arranged radially close to the heat source, it is heated evenly, the temperature distribution is good, and the heating efficiency is high.

The wire rod annealing apparatus of the above embodiment has a plurality of wire passing pipes arranged in parallel in a ring around an electric heating element, and the outer periphery of the pipes is covered with a heat insulating material in a cylindrical shape, thereby simplifying the annealing furnace. It has the effect of improving thermal efficiency.

In the annealing furnace of the above embodiment, a plurality of wire rod passing pipes 2 are arranged in an annular row around a heating element 5, and a gap is provided between each wire rod passing pipe 2 to allow the wire rod to pass through in multiple concentric rows. By arranging the pipes 2, the number of annealed wires can be further increased.

Further, as the heating element 5, it is also possible to use a gas flame or a heavy oil burner flame, etc., without using an electric resistor as described above.
- In this case, it is reasonable to make the annealing furnace 10 inclined or vertical.

The wire annealing device of the present invention has a relatively simple structure, low cost, and high thermal efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional wire annealing furnace, FIG. 2 is a front view of a wire annealing furnace according to an embodiment of the present invention, and FIG. 3 is a sectional view taken along line AB in FIG. 1: wire rod, 2: wire rod passage pipe, 3: steam layer, 4: air layer, 5: heating element, 6: heat insulating material, 7: exterior plate, 10: annealing furnace, 11: interior plate.

Claims (1)

[Scope of utility model registration request] A wire rod annealing device comprising a plurality of wire rod passing pipes through which the wire rods pass, a heating element that generates heat through the wire rod passing pipes via an air layer, and an insulating wall surrounding the heating element and the wire rod passing pipes. The heating element is a single rod-shaped heating element, and the plurality of wire passing pipes are arranged in parallel around the heating element, and the periphery thereof is covered with a cylindrical heat insulating material layer. A wire rod annealing device characterized by: