JPS61134268A - Wire having good toughness for dot printer - Google Patents

Abstract

PURPOSE:To provide a wire to be drawen very easy and having an excellent toughness by drawing and aging steel containing a specified amount of special metalic element after a solid solution treatment. CONSTITUTION:A coil of steel composed of C <=0.03%, Si <=0.10%, Mn <=0.10%, Ni 16.0-19.0%, Mo 2.0-6.0%, Al 0.02-0.2%, Ti 0.70-1.90% in weight and the remainder of iron and impurities is drawn to a wire having reduction ratio of more than 80% after a solid solution treatment, then drawn to the wire having a prescribed dimension of diameter of approximately 0.3mm, and being subjected to an aging treatment at a temperature of before and after 480 deg.C, and being deposited and hardened with a hardness exceeding Hv 620. Steel of aforesaid composition changes to a low carbon martensite by the solid solution treatment of a water cooling at a temperature of approximately 820 deg.C, and its hardness is HRC 28-32, and drawing and wiredrawing working are easy since it is relatively soft.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a wire for dot/butanter, and it is very easy to draw the wire into an ultra-fine wire, and the material cost is relatively low. The present invention relates to a wire for dot printers that is inexpensive, easy to process in PL and hardening heat treatment, and has good toughness.

(Prior art) Wires for dot printers are highly abrasion resistant, strong, have high fatigue strength, easy to draw and heat treat, and have excellent corrosion resistance.
It is also required that the price be low. Current printer wires are mainly made of hardened ultra-fine high-speed steel wires and cobalt-based alloys.

High-speed steel wire is produced by repeatedly drawing and annealing the wire to make it into an ultra-fine wire, then quenching it, tempering it, and then cutting it. However, in order to make ultra-fine wire from high-speed steel, a long wire drawing process is required. The disadvantage is that the price is high because it is necessary. Although it has excellent wear resistance, it lacks toughness and may break during use.

10,000, Co-based alloy is Co'l/%, Ni/, 2%
, MO6%, Cr2θ, and a large amount of expensive alloying elements, so it has the disadvantage of being expensive.

(Technical Problem) The present invention has been made in view of these problems.
To provide a gold wire for dot printers which is extremely easy to draw into ultra-fine wire, has low material costs, is easy to heat cure, and has excellent toughness.

(Technical means) That is, the present invention provides Cθθ3% or less, Sin/
θ Chi or less, Mn θ/θ Chi or less, Ni/&θ~15! θchi, MO-Zθ-4θchi, AJilθθ, 2 to 4.2θchi, Tia7θ to lriθchi, after solution treatment of a steel wire drawing coil with the remainder iron and impurities, the area reduction ratio The above-mentioned wire drawing process is applied to draw the wire to a predetermined size wire with a diameter of around θ3fi, and the wire is then subjected to an aging treatment at around 0°C to harden it by precipitation to H mallo 2θ or higher. This is a dot printer wire with good toughness. For rolled steel coils, for example, after solution treatment is performed by heating to approximately 20°C and cooling with water, the wire is drawn to a point where the area is reduced by θ, and then the entire solution treatment is performed, followed by drawing. θ
The process of elongating the area reduction rate by 1fM is repeated to make the diameter thinner, and finally the area reduction rate is approximately ? After applying the wire drawing process,
After making the wire to a predetermined size with a diameter of around θ3, the wire is aged at around 0°C for around Jh (hours).
Precipitation hardening can be performed to a temperature higher than HvAλθ.

Next, the reasons for limiting the composition of the dot printer wire according to the present invention will be described. Since C impairs the toughness of low carbon martensite, the value of θθ is set to 3 cm or less. Si and Mn have a deoxidizing effect, but if the value exceeds θ/θ, the toughness decreases, so the amount of 0. /chi or less. Ni is necessary to form a martensitic structure and is also necessary to stabilize the martensitic structure up to the aging temperature, but /6q
If it is less than b, the effect will be small, and if it exceeds /St, residual austenite will appear, so /mu θ~/! I set it to θ. Mo contains intermetallic compounds and is necessary to cause precipitation hardening by aging treatment, but if it is less than 1.2%, the effect will be small, and if it exceeds 6%, the toughness will decrease, so it is necessary to did. An is added as a deoxidizer,
In addition, since it improves the age hardening characteristics, it is set to a02 to 02θ. Ti is necessary to form the intermetallic compound Ni3Ti'z and cause precipitation hardening, but its effect is small for a7θ7θ, and /9%? If the angle exceeds θ, the toughness decreases, so θ was set at 7 to 151 inches.

(Function) Steel with the above composition is converted into low carbon martensite by water cooling solution treatment at approximately 2θ°C, and has a hardness of HRo of 2 to 3.2, which is relatively soft, so that it has a drawing elongation of 1/2. Mm processing is easy, and cold drawing with an area reduction of up to 5% is possible without intermediate solution treatment. In this way, after performing cold wire drawing with a strength greater than or equal to the reduction rate of θ, yIrθCXJ
h (hours) When aging treatment is performed, Hv A , 2θ~
It can be precipitation hardened to a high hardness of 6jθ.

Furthermore, since the steel having the above composition does not contain expensive Oak, it also has the advantage that the material cost is much lower than that of a high Co-based alloy.

(Example) The present invention will be described in detail below. Table 1 shows the chemical composition of the wire according to the present invention and the wire made of 8KH and high Co-base alloy.

Symbol person indicates the wire according to the present invention, symbol B is 8KH
The symbol C indicates a wire made of Oo-based alloy. 8KH with symbol B? can be cold drawn without intermediate annealing because the area reduction rate is 3θ to 3θ, so 5KHF and h
The intermediate annealing required to draw the wire from O to θ3mψ wire is 72 to 76 times.

Table 1 Chemical composition of wire for printers On the other hand, the steel of the wire of the present invention indicated by the symbol fJILff[
Since it is possible to draw wire up to 5 wires without intermediate solution treatment, the intermediate solution treatment required to wire a j:j+m121 coil or 0.3 mφ wire is three times.

On the other hand, since the CO-based alloy with the symbol 0 can be wire-drawn up to 0% without intermediate solution treatment, the intermediate solution treatment required for wire drawing from 0jWφ to θ33φ wire is 2 times.

Table 2 Durability Test Results Next, Table 2 shows the heat treatment hardness of the 0.3 m g3 wire and the breakage rate after conducting a /θ6 round hammer test as a printer wire. That is, the symbol person makes a wire drawing coil g, 2θ℃ after solution treatment, performs cold drawing with an area reduction rate of 0.3tpssφ,
It was precipitated and hardened to Hv4jθ by aging treatment for 3 hours). As a result of 706 hammering tests of printer wires with symbols A%B and O, the breakage rate of symbol B was 75%.
On the other hand, it can be seen that the wire of the present invention has excellent toughness when the breakage rate θ of the symbol 1 and symbol C is determined.

(Effects) As explained above, the present invention provides Cθθ3% or less, 5i
(110'ip or less, Mn O/S or less, Ni/
＆θ～/! θchi, MoQθ〜瓜θchi, Aj! θθλ−θ
, 2%, Ti θ 7~l θ ti, remaining iron and impurities. After the gold solution treatment, the wire is drawn with an area reduction rate of about 5%, and the wire is drawn to a specified diameter of about 0.3 mm. After making the wire into a wire with dimensions of Moreover, Co-based alloy wire is also inexpensive.

Procedural formalities (methods) 1. Indication of the case 1981 Patent Application No. 25525
No. 7 No. 26 Name of the invention Name of wire for dot printer with good toughness Name Plus Engineering Co., Ltd. 5 Date of amendment order March 6, 1985 6 Subject of amendment In the title of the invention in the specification of contents, the phrase "Wire for dot printers with good toughness" is amended to "Wire for dot printers with good toughness."

Patent applicant

Claims (1)

[Claims] In weight%, C 0.03% or less, Si 0.10% or less, M
n0.10% or less, Ni16.0-19.0%, Mo2
．． 0-6.0%, Al0.02-0.20%, Ti0.
After solution treatment, a steel wire drawing coil consisting of 70 to 1.90%, the balance being iron and impurities is subjected to wire drawing processing with an area reduction rate of 80% or more to form a wire of a predetermined size around 0.3 mm in diameter. Wire drawing, then aging treatment at around 480℃,
A dot printer wire with good toughness, characterized by precipitation hardening to Hv620 or higher.