JPS5936591B2 - Dot printing wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dot printing wire provided with wear-resistant contacts.

The dot printing wire must have a small diameter due to the structure of the printer and the need to print detailed letters, numbers, etc. Therefore, the dot printing wire must be made of steel, W, W-Re alloy, Ti,
Wires made of materials such as Ta2Re are used, but they have the disadvantage that the contact portion at the tip wears out in a relatively short period of time because printing is performed at high speed.

In order to improve this drawback, attempts have been made to use wire rods made of superhard materials such as WC-Co, and to provide coatings such as TiC or TiN on the tips of the wires, but the former has problems in terms of toughness. The latter has the disadvantage that it is easily broken and is not easy to process, and the latter has the disadvantage that the adhesion of the film is not good and furthermore it is difficult to process. Another important requirement is high corrosion resistance against ink and the like. Therefore, at present, W wire, which is unsatisfactory in terms of wear resistance and corrosion resistance, is being used without any problems being solved. In order to solve these problems, the present invention includes a wear-resistant contact portion formed of an alloy of a platinum group metal and a transition metal, or an alloy of a platinum group metal, a transition metal, and boron, at the tip of the wire body. The company succeeded in extending the useful life of the wire, eliminating the complication of replacing the wire, and increasing the reliability of the printer. Alloys of platinum group metals and transition metals, or alloys of platinum metals, transition metals, and boron, are not only excellent in wear resistance, but also have the advantage of being melted into small balls for welding to the tip of the wire. When produced by this method, it has the advantage of exhibiting very good ball-forming properties, making it extremely suitable for use in the contact portion of dot printing wires.

In the present invention, the wire body is made of steel, W, W-Re alloy, T
Wires such as i, Ta, Re, etc. may be used.

Examples of alloys forming the wear-resistant contact portion are as follows. I Alloy of platinum group metal and transition metal (1) Os-Re (2) Re-Os-Ta (3) Platinum group metal other than Os in Os-Ta, and W2
Co3Fe3Ni, one or more of 3Nb, Re added to C, one or more of Fe, CO, Ni, Re added one or more of Rh, Fe, CO, Ni, one or more of Ni Alloys of platinum group metals, transition metals, and boron Added to one or more of Fe, CO, and Ni The above alloys may be manufactured by either melting or sintering, or in the case of sintering. Try to eliminate so-called nests as much as possible.

The above-mentioned alloy is joined to the tip of the wire body by electric energy such as arc welding or resistance welding, by radiant heat such as light beam welding, or by heat from combustion gas such as acetylene propane or city gas.

It is also possible to use a brazing filler metal during bonding; in this case, it is effective to perform pretreatment prior to bonding. For example, when the wire body is a W wire, Al or Ni may be pre-plated, and Cu or a Cu alloy may be applied thereon. Brazing materials include Chikarat cold, eutectic gold solder, industrial gold solder,
Commonly used materials such as silver solder and copper solder can be used. The characteristics of the wire of the present invention are as follows. (
1) Wear resistance The alloy of the contact part has a uniform structure and moderate hardness. (In the case of cemented carbide, it is a non-uniform mixed structure of hard parts such as carbides and nitrides and relatively soft parts such as CO as a bonding material.

)(2) The alloy has a Bitkers hardness of 600 to 1000.
It is easy to polish or grind to a certain degree.

(In the case of cemented carbide, the Bitkers hardness is generally 1500.
There are many more than that. ) (3) It does not break like cemented carbide metals, and its toughness can be adjusted using Pt, Ru, etc.

(4) Excellent corrosion resistance h.

(5) Extremely superior wear resistance compared to conventional wire.

Next, embodiments of the present invention will be described.

Example 1 A ball with a diameter of approximately 0.511 was made by arc welding powder of 0s-Re alloy (weight ratio 30:70), and an outer diameter of 0.35.
U10) K on the tip of the wire body of W wire with a light beam
18 force rat cold was used as a brazing material, and the outer diameter was polished with GC and a stone to the same diameter as the wire body, and the tip surface was ground perpendicular to the axis of the wire body to form a contact part.

(The weight ratio of the 0s-Re alloy in this example is 10 to 40:6.
0 to 90 is sufficient. ) Example 2 The same procedure as Example 1 was carried out except that Re-0s-Ta alloy (weight ratio 40:40:20) was used.

(The weight ratio of the Re-0s-Ta alloy in this example is 40 to 7
5:20-40:5-20 is sufficient. ) Example 3 The same procedure as Example 1 was carried out except that a C0-Ru-W alloy (weight ratio 20:45:35) was used.

(The weight ratio of the CO-Ru-W alloy in this example is 5 to 25:
It may be 46 to 94:49 or less. ) Example 4 Re-0s-Ta-B alloy (weight ratio 60:30:9.5
:0.5) was used in the same manner as in Example 1.

(The weight ratio of the Re-0s-Ta-B alloy in this example is 40
~748:20~40:5~20:0.2~2 may be used.
) Example 5 A sphere with a diameter of 0.511 was made from alloy powder of Re-Ru-Ta-B (weight ratio 80:14:5:1) by arc heating.
A thin layer of Au-Ge eutectic alloy solder is applied to this surface and the outer diameter is 0.
．． 35Um0) A W wire rod (same quality as Example 1) was joined to the tip of the wire body by resistance welding, the outer diameter was made the same diameter as the wire body, and the tip surface was ground perpendicular to the axis of the wire body, as a contact part. , one wire.

(The weight ratio of the Re-Ru-Ta-B alloy in this example is 50
~80:14~30:5~14.3:0.2~2 may be sufficient. ) Example 6 Re-Ru-W-Ta-B alloy (weight ratio 75:1525
:5:0.7) was used in the same manner as in Example 5.

(The weight ratio of Re-Ru-W and Ta-B alloy in this example is 50-75:14.8-35:5-30:5-15:0.
．． 2-2 is enough. ) Comparative Example l The above alloy was not joined, and the outer diameter was 0.35, which was the same as Example 1.
mwL(7)W wire rod was used.

Comparative Example 2 WC-CO fuel alloy (weight ratio W:C:CO288:J metal)
A wire was prepared in the same manner as in Example 1 except that F5) was used.

A load of 1 kg was applied to the tips of the wires of Examples 1 to 6 and Comparative Examples 1 and 2, and the nylon cloth (thickness 120μ) supplied onto the metal plate was pressed 30 million times at a rate of 1400 times per minute. The results of the amount of wear and the presence or absence of cracks or breakage are shown in column 1 of the following table.

The wires of Examples 1 to 6 and Comparative Examples 4 and 2 were connected to a dot printer manufactured by Brother Co., Ltd. (21-inch wide ink ribbon for high-speed printers, printing paper of Stock Holmes continuous paper 55k9 paper Pl was used, printing speed was The amount of wear of the wire when used at a speed of 180 characters/sec) and printed 30 million characters is shown in the following table. As is clear from this table,
The wire of the present invention has excellent abrasion resistance that is approximately five times greater than that of conventional wires.

Claims (1)

[Claims] 1 Platinum group metal, Nb, Ta,
An alloy of a transition metal selected from Cr, W, Re, Fe, Co, Ni, or a platinum group metal and Nb, Ta, Cr, W,
A dot printing wire with wear-resistant contact parts made of an alloy of boron and a transition metal selected from Re, Fe, Co, and Ni.