JPS5820345A - Production of member having vent hole - Google Patents

Abstract

PURPOSE:To form vent holes of a uniform hole diameter by winding wires spirally around tubular metallic core materials, and heating the wires to temp. higher than the m.p. of the core materials thereby melting the core materials and allowing the melts to be absorbed among the wires. CONSTITUTION:A core material is constituted of a tubular metallic core material 4, and 1 or >=2 windings made of metal or ceramics having a m.p. higher than the m.p. of the material 4 are wound spirally in single or plural pieces around the material 4, whereby secondary wire materials 3 are formed. The material 3 alone or plural pieces thereof are bundled and are heated to temp. higher than the m.p. of the materials 4. The materials 4 are melted and the melts thereof are absorbed among the windings and the secondary wire materials 3, whereby vent holes are formed where there were the materials 4.

Description

Detailed Description of the Invention The present invention relates to air vents used in metal casting sources, die casting molds, and molding parts of rubber, plastic, etc., columnar filters that impair ventilation in the axial direction, and fixed-quantity supply nozzles for fluids. The present invention relates to a method of manufacturing a member having ventilation holes for use in heat exchange pipes, friction materials whose cavities are filled with a lubricating material, and the like.

As shown in Figure #I1 in the 1980 patent application @/JDar/, the applicant has previously proposed that, as shown in Fig. A metal or ceramic winding IIJ having a melting point is spirally wound in a single layer or in multiple layers to form a secondary wire J, and this binormal wire J is bundled singly or in plural to form the core S/. A method was proposed in which the core sl is heated to a temperature higher than the melting point or combustion temperature, causing the core sl to flow out or burn out, and a vent hole is formed where the core wire was present. According to this method, a member having ventilation holes that are long in the axial direction and have relatively uniform pore diameters and has a regular pore distribution can be manufactured continuously at an extremely low cost without the need for large-scale equipment. Can be manufactured at a low price.

However, in the above-mentioned method, if the diameter ratio of the core wire and the winding wire is set to 1:1 or more in order to secure 3% or more of the empty IlI force in the product obtained by elution and removal of the core wire, the melting of the core wire becomes difficult. The excess molten material that cannot be absorbed between the windings or between the primary wires and is not taken up by the core material remains in the position where the core material was, narrowing the pore diameter and sometimes blocking the pores, thereby reducing the porosity. It was difficult to increase the porosity above a certain value. In order to remove the above-mentioned excess melt and increase the porosity, heat treatment was performed by placing the molten metal or a bundle of them on an external porous body. A possible method is to collect the molten material in an external porous body by using a heat sink, but there are many problems such as fusion with the porous body after cooling and clogging due to mutual diffusion at the contact area, making it impractical. Not on point.

An object of the present invention is to use a tubular metal core material instead of metal silver as the core material in the invention of the patent application mentioned above, so that the ratio of the outer diameter of the core material to the diameter of the winding wire is 1:1.
Therefore, according to the present invention, it is possible to manufacture a member that accommodates a vent hole with a porosity higher than that of the above without producing excessive melt. The core material is made of a tubular metal core material, and one or more winding shafts made of metal or ceramic having a melting point higher than that of the core material are spirally wound in a single layer or in multiple layers. Next wire rod and pear, this 1
Next, bundle one or more wire rods together, heat the bundle above the melting point of the metal constituting the core material, melt the metal core material, and apply the molten material between the windings and to the secondary wire. It is characterized by forming vent holes where the core material was located.

Next, the present invention will be explained with reference to the drawings.

Figure J shows an example in which a metal pipe such as a steel pipe is used as a core material, and a secondary wire 3 is formed by attaching a winding 11JIti1 such as iron wire having a melting point higher than the melting point of the metal pipe around the metal pipe. .

In the example illustrated above, a metal tube is used as the tubular metal body serving as the core material. It is also possible to use as a tubular metal core material 1, which is made by covering the shoulders of a wire rod with metal.

In carrying out the present invention, even though a tubular metal core material is used as the core material, if excessive core material melt is generated due to the gap between the winding S and the secondary wire material, In this method, the core material molten material is bundled together with a porous material IJ secondary wire material that can take Wk, and the excess core material melt is absorbed by this porous material, thereby eliminating clear flow at the pores. It is better to secure an effective pore area＠Also, it is possible to use other unknown metals on the surface of the winding wire, which have a higher melting point than the core metal and which mutually form a liquid phase at the heating temperature. In the above patent application, even if the core material is melted and the windings are heated at a temperature that does not melt them, the molten material generated from the core material and the metal forming the windings are In the case where a mutual liquid phase is produced and alloyed at the heat treatment temperature, the winding shaft is eroded, and the formed alloy causes stagnation, resulting in narrowing or clogging of the holes.

Despite these problems, combinations that result in the above-mentioned alloying as the main materials of the core material and spring jacket may be unavoidable due to the need for electrical and thermal conductivity, and in such cases In addition, a 4% dissimilar metal layer is formed on the surface of the winding wire by surface treatment such as plating or vapor deposition, or by enveloping the pipe material such as a cladding material, thereby preventing the reaction between the winding shaft material and the core material melt. , it is possible to facilitate penetration of the core material melt into the winding gap.

In the present invention, the pore diameter and pore distribution depending on the oil used or the pore size and pore distribution are determined according to the oil used. In order to obtain high strength, the secondary shaft members are bundled and inserted into the hollow tube and then heat treated, or they are subjected to swaging, doweling, etc. before or after insertion into the hollow tube. It is also possible to perform layered processing. When performing such attribute processing, filling the inside of the tubular metal core with a wire made of plastic or organic material prevents the cross-sectional shape of one tubular metal core from being deformed into a flattened shape due to the attribute processing before heating. However, the hollow circular shape can be maintained, and the void obtained by heating can also maintain the same circular cross section. The plastic or organic material to be filled inside the tubular metal core material should be one that burns or decomposes and disappears during heating and can easily form a lid.

When using two or more winding shafts, the windings may be of the same material and wire diameter, or may be of different combinations. The combination of secondary wires is not limited to the same combination, but may be a combination of primary wires made of different core materials. The winding process can be sped up by spirally winding more than one winding wire in a single layer or in multiple layers to form a primary wire material, and it is also possible to obtain a combination of various materials of different materials. .

The primary hoops can be tied by wrapping wire or mesh around the outer periphery and fixing them, or by using steel pipes with an exception diameter of 7.3 m, thickness 0.0j-1 length 1oo- A core material is used, and iron wires with an outer diameter of O and J- are wrapped around it to form a secondary wire material, and this secondary wire material/21 wires have an outer diameter of J+7.
After loading it into an iron pipe with a thickness of 100 ms and a thickness of 200 mm, it was reduced to an outer diameter of 13 wm by drawing process. Then, it was kept in a vacuum oven/JOO°C for S minutes and cooled. As a result, a member having ventilation holes with a pore diameter of 0.417 m and a porosity of 36 was obtained.

According to the present invention, a relatively uniform and large m
A member having ventilation holes having a pore diameter of 'Ik and a regular pore distribution can be manufactured continuously at an extremely low cost without requiring large-scale equipment.

[Brief explanation of the drawing]

Figure 1 is a partial side view of a primary wire whose core material is linear, #
The IJ diagram is a partial side view of a primary wire whose core material is tubular. Core material〇

Claims (1)

[Claims] L Around a core material, I or two or more winding wires made of metal or ceramic having a melting point higher than that of the core material are spirally wound in a single layer or in multiple layers to form a secondary wire material, and this - Next, in a method in which a single wire or a plurality of wires are bundled, heated above the melting point of the core material, the core material flows out, and a ventilation hole is formed where the core material was. 1. A method for manufacturing a member having ventilation holes, characterized in that the member is made of a material.