JPH01317641A - Production of composite core wire for production of honeycomb body - Google Patents

Abstract

PURPOSE:To prevent the unequal thickness of a product and to reduce the cost of production by forming a tape-like coating material around a core mate rial which can be melted away, then drawing this composite material rod. CONSTITUTION:The core material consisting of Al, etc., and the tape-like coating material are prepd. while the core material is run longitudinally, the tape- like coating material is affixed to the core material. The side end faces of the coating material are then welded to each other and the composite formed in such a manner is diametrally reduced by rolls, by which the composite material rod 9 is obtd. The rod 9 is let off from a delivery reel 11 and is heated to a prescribed temp. in a heating furnace 12. After the heated rod is drawn to a desired sectional shape by a die 13, the composite core wire 10 is taken up on a take-up reel 14. The unequal thickness of the product honeycomb body is prevented and the long-sized material is continuously formed as the composite core wire 10 is obtd. by affixing the tape-like coating material to the core material to form the composite rod 9 and drawing this rod. The cost of the production thereof is, therefore, reduced.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is applicable to a honeycomb body having a large number of hexagonal holes and used as a core wire when manufacturing a honeycomb body used as an X-ray collimator of a scintillation camera, etc. The present invention relates to a method for manufacturing a composite core wire for manufacturing a honeycomb body.

[Prior Art] As shown in FIG. 2, a lead honeycomb body 1 used as an X-ray collimator has a plurality of holes 2 each having a regular hexagonal cross section in a cylindrical lead block at the most densely packed position. , and are arranged parallel to each other so as to extend in the longitudinal direction. By passing the X-rays through the holes 2 of this lead honeycomb body 1, the direction of X-ray irradiation is kept within a predetermined solid angle.

As a method for manufacturing this lead honeycomb body for a collimator, the method shown in Japanese Patent Laid-Open No. 133872/1983 is known. In this method, first, as shown in FIG. 3, a composite wire 5 is manufactured in which a thin covering material 4 is coated around a core material 3 having a hexagonal cross section.

This covering material 4 is made of a lead-antimony alloy which is a constituent material of the lead honeycomb body 1, and the core material 3 is made of aluminum. Then, the composite wires 5 are arranged in the densest form with their sides touching, and heated and pressurized to join the composite wires metallurgically.Next, the aluminum core material 3 portion is chemically bonded. By dissolving and removing the core material 3, a honeycomb body 1 is manufactured in which the portion where the core material 3 was present becomes the hole 2.

Thus, the composite wire 5 has conventionally been manufactured by a hydrostatic extrusion method.

[Problems to be Solved by the Invention] However, in this conventional method for producing a core wire (composite wire 5), a core wire is produced from a composite billet consisting of an aluminum core material 3 and a lead-antimony alloy coating material 4 by hydrostatic extrusion. Since the composite wire 5 is manufactured, the core wire manufacturing process is a batch process 5, and since long products cannot be manufactured, the manufacturing cost is high. In addition, since the thickness of the covering material 4 is extremely thin at 0.09+w+, if there is minute bending deformation in the core material 3 or there is vibration during manufacturing, the composite wire 5 manufactured by the hydrostatic extrusion method may Uneven thickness occurs.

Therefore, there is a problem that the thickness of the partition walls of the honeycomb structure becomes non-uniform.

The present invention has been made in view of such problems, and includes:
It is an object of the present invention to provide a method for manufacturing a composite core wire for manufacturing a honeycomb body, which avoids deflection of a covering material, allows easy manufacture of a long core wire, and has excellent productivity.

[Means for Solving the Problems] The method for manufacturing a composite core wire for manufacturing a honeycomb body according to the present invention includes:
A step of forming a tape-shaped covering material made of a material constituting the honeycomb body into a cylindrical shape around a core material made of a material that is more easily eluted than the covering material to obtain a composite rod, and a process of wire-drawing this composite material rod. The method is characterized by comprising a step of processing to obtain a composite core wire of a predetermined shape.

[Function] In the present invention, first, a tape-shaped covering material formed of a material constituting a honeycomb body, that is, a material constituting the partition walls of a honeycomb body, and a core material made of a material that is easier to dissolve than this covering material. Prepare. This core material has characteristics such as being dissolved by chemicals that do not dissolve the coating material material, and is made of a material that is more easily eluted than the coating material, and it is necessary to dissolve it with the chemicals when manufacturing the honeycomb body. According to
For example, the coating material may be a lead alloy, and the core material may be aluminum.

Then, the coating material is formed into a cylindrical shape around the core material to obtain a composite rod. Thereafter, this composite material rod is wire-drawn to produce a composite core wire of a predetermined shape (for example, a hexagonal cross section) for manufacturing a honeycomb body.

The composite material rod can be continuously formed into a long length by roll forming or the like, and also can be continuously formed into a long length by wire drawing. Therefore, in the present invention, a long composite core wire can be easily manufactured.

Furthermore, by making the covering material tape-shaped and having a uniform thickness, the thickness of the obtained core wire covering material becomes uniform, and uneven thickness can be prevented.

[Examples] Examples of the present invention will be specifically described below with reference to the accompanying drawings.

First, a first embodiment of the present invention will be described.

In this example, the first step is to roll form a cladding material around a core material to obtain a composite rod. For example,
The core material is pure aluminum with a purity of 99°998% by weight.
AfI) and is a strip material with a diameter of 4.5 mm. On the other hand, the coating material is made of, for example, 4% by weight of antimony (Sb).
It is a tape-shaped material made of a lead (Pb) alloy containing 0.25+ m of uniform thickness.

Prepare such a core material and covering material, run the core material in its longitudinal direction, attach a tape-shaped covering material to the core material with its longitudinal direction aligned with the core material, and cover by roll forming. The material is formed into a circular tube shape around the core material.Next, in a series of steps following this roll forming, the side end surfaces of the covering material are continuously joined together using, for example, pure tungsten electrodes and TIG welded to form the core material. A composite body is obtained in which the material is fitted into a circular tubular covering material. The outer diameter of this composite material is, for example, 6 mm. Thereafter, the diameter of the cylindrical covering material is further reduced using rolls to bring the core material and the covering material into close contact with each other.

As a result, a composite rod having a core material coated with a coating material is obtained.

Next, the composite rod is wire-drawn using the apparatus shown in FIG. This composite material rod 9 is attached to a delivery reel 11
The composite material mouthpiece 9 is wound around this delivery reel 1.
After being unwound from 1 and subjected to a predetermined wire drawing process, it becomes a composite core wire 10 and is wound onto a take-up reel 14. A heating furnace 12 made of a cylindrical resistance heating element or the like is disposed in the strip movement area between the delivery reel 11 and the take-up reel 14, and the composite rod 9 is moved inside the heating furnace 12. By passing through it, it is heated to a predetermined temperature. At the outlet of the heating furnace 12, there is a temperature measuring device 15 for measuring the temperature of the composite material rod 9.
is provided, and the measurement results of this measuring device 15 are input to a temperature control device (not shown). Then, this control device controls the temperature of the composite material rod 9 by adjusting the current flowing through the heating furnace 12 so that the temperature measured by the measuring device 15 is a predetermined temperature in the range of, for example, 80 to 90°C. .

Thereafter, the composite rod 9 passes through a die 13 and is drawn into a predetermined cross-sectional shape. In addition, the composite material rod 9
has a circular cross-sectional shape, but if the desired core wire cross-sectional shape is hexagonal, this wire drawing process can be repeated several passes, for example, the final shape can be deformed step by step from several passes before the finishing pass. All you have to do is make it into a hexagonal shape.

Next, a second embodiment of the present invention will be described.

In the first embodiment described above, a composite rod having a circular cross section was manufactured and then formed into a predetermined cross-sectional shape such as a hexagon by wire drawing. However, in this embodiment, a composite material rod having a hexagonal cross section is obtained and then wire-drawn.

First, a core material and a covering material having the dimensions and materials exemplified in the above-mentioned first embodiment are prepared, and then the core material is formed in-line into a hexagonal cross-section using forming rolls. Then,
A tape-shaped covering material is formed into a circular tube shape around the core material by roll forming. After continuously welding the side end surfaces of the covering material, the cylindrical covering material is formed into a hexagonal tube shape using a die having a hexagonal cross section, and the core material and the covering material are brought into close contact with each other.

Then, by wire drawing in the same manner as in the first example, a composite core wire with a hexagonal cross section having the same shape as the composite core wire manufactured in the first example is finally manufactured.

[Effects of the Invention] According to the present invention, a tape-like covering material is formed into a cylindrical shape around a core material to form a composite rod, and this composite rod is wire-drawn to obtain a composite core wire of a predetermined shape. Therefore, since a tape-like covering material is used, uneven thickness can be prevented from occurring in the manufactured composite core wire for manufacturing a honeycomb body. Further, since the cylindrical forming step and the wire drawing step can be performed continuously, a long composite core wire can be obtained, and the composite core wire can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a wire drawing apparatus, FIG. 2 is a perspective view of a lead honeycomb body, and FIG. 3 is a perspective view of a composite core wire for manufacturing a honeycomb body having a hexagonal cross section.

Claims (1)

[Claims] (1) A step of forming a tape-shaped covering material made of a material constituting the honeycomb body into a cylindrical shape around a core material made of a material that is more easily eluted than the covering material to obtain a composite rod; A method for manufacturing a composite core wire for manufacturing a honeycomb body, comprising the step of wire drawing to obtain a composite core wire in a predetermined shape.