JPH0835125A - High-strength card clothing wire - Google Patents

Abstract

PURPOSE:To obtain a card clothing wire having no softening point, having high mechanical strength, toughness and elongation, also having wear resistance comparable to conventional such wires, and capable of manufacturing inexpensive card clothing. CONSTITUTION:This card clothing wire consists of an alloy steel having the following chemical composition (wt.%): C: 0.50-0.70, Si: 1.20-1.60, Mn: 0.50-0.90, Cr: 0.50-1.50, and the rest: Fe and inevitable impurities, and also has a uniform surface hardness of >=730Hv, the uniform tensile strength in the longitudinal direction of >=2500N/mm<2> and a uniform elongation of >=5%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength woven wire used for spinning cloth.

[0002]

2. Description of the Related Art Conventional woven wire is made of hard steel wire equivalent to SWRH57A, drawn to its final size and shape, and then subjected to quenching and tempering treatment to obtain a surface hardness of 500 Hv or less, The tensile strength was 2200 N / mm ² or less, and the elongation was 5% or less.
Next, using the above-mentioned needle-wiring wire, after forming a U-shape, it is transplanted to a base cloth, and further, a required portion of the tip portion (needle tip portion) of the implanted needle-wiring wire is subjected to quenching treatment, and 750 Hv The front and back surface hardness was given and the desired clothing was manufactured.

However, due to the heating in the quenching treatment, a so-called softening point, which is extremely lower in hardness than the surface hardness before quenching, is generated below the quenching portion. In the carding process of spinning, there is a problem that the softening point is used as a starting point and the needle tip portion is actuated by the resistance due to the carding action to cause deterioration of the sliver quality and troubles such as needle contact. In other words, when a needle is raised, the number of twisted cotton lumps (called nep) remaining after carding per unit amount of cotton, that is, the number of neps, increases, and the sparks generated during needle contact burn the cotton. Had a problem that caused a fire. Further, since a quenching process is required, there is a problem that the manufacturing cost becomes high.

As a means for solving the above problems, it is considered to increase the carbon content of the hard steel wire. However, when the carbon content increases, the surface hardness and strength improve, but the elongation decreases and the cold workability deteriorates. Therefore, problems such as die thickening, seizure, and surface roughening occur in the wire drawing step, and the U-shape forming processability deteriorates in the needle cloth manufacturing step, and it has not been put to practical use. As another means, a method of applying a hard substance to the surface of the needle wire is also known. However, with this method, the surface hardness increases dramatically, but due to the increase in manufacturing processes and manufacturing costs,
It is far from being put to practical use as it will result in expensive stitching.

The present invention has been made in order to solve the problems of the above-mentioned conventional needle laying. That is, it is an object of the present invention to provide a woven wire which has no softening point, has high strength, toughness, and elongation, has the same wear resistance as conventional products, and can be manufactured at a low cost.

[0006]

In order to achieve the above object, the high strength needle wire of the present invention has a chemical structure of C:% by weight.
0.50 to 0.70, Si: 1.20 to 1.60, M
n: 0.50 to 0.90, Cr: 0.50 to 1.50,
The balance: Fe and alloy steel that is an unavoidable impurity,
The surface hardness is uniformly 730 Hv or more, the tensile strength in the longitudinal direction is uniformly 2500 N / mm ² or more, and the elongation is uniformly 5% or more.

[0007]

The reason for limiting the range of each additive element in the present invention is as follows. C is an important element that contributes to the improvement of strength and forms carbides to impart wear resistance,
0.50% by weight or more is necessary, but if it is too large, the elongation becomes small, so that the cold workability becomes poor, and the bending workability when forming a U-shape and implanting needles on the base cloth becomes 0. .7
It is 0% by weight or less. Si is required to be 1.20% by weight or more as a deoxidizing agent, but if it is too much, the elongation becomes small and the cold workability is impaired, so it is made 1.60% by weight or less. Mn
Is required to be 0.50% by weight or more as a deoxidizing agent like Si, but if it is too much, hot workability is impaired.
It should be less than or equal to weight%. Cr forms a carbide to improve strength,
Contributes to improved wear resistance. It also secures hardenability and gives sufficient heat treatment hardness. For the above reasons, Cr is less than 0.
50% by weight or more is necessary. However, if it is too large, the elongation becomes small and the material becomes brittle, which impairs cold workability and bending workability, so the content is made 1.50% by weight or less.

Further, the high-strength clothing wire of the present invention has a uniform surface hardness of 730 Hv or more, and therefore has sufficient wear resistance. Further, since the high-strength needle-woven wire of the present invention has a uniform tensile strength in the longitudinal direction of 2500 N / mm ² or more, the entire needle-wiring wire is rich in strength and toughness, and has a large restoring force for the deformation action. Therefore, even if resistance is applied during the carding process, the degree of bending is very small. Furthermore, since the high-strength needle-woven wire of the present invention has a uniform elongation of 5% or more, it has excellent cold workability.

As described above, since the high-strength needle woven wire of the present invention has abrasion resistance, strength, toughness, and elongation, it is necessary to perform hardening treatment on the needle tip portion after implanting the needle on the base cloth. There is no. Therefore, since the softening point does not occur, the above-mentioned various problems of the related art do not occur, the carding effect is good, and the life of the clothing can be greatly extended. Further, it is not necessary to subject the needle tip portion to quenching treatment, and since it has excellent cold workability, it is possible to reduce the cost for manufacturing clothing.

[0010]

EXAMPLES The high-strength wire laying according to the present invention will be described below with reference to examples. The chemical composition of the test material is as shown in Table 1.

[0011]

[Table 1]

After melting and forging each of the No. 1 to 8 test materials,
Patenting, pre-drawing treatment, and cold drawing were repeated to finish a wire rod having a wire diameter of 0.30 mm. Next, each wire rod was subjected to quenching and tempering treatment at a temperature shown in Table 2 to obtain a desired woven wire.

[0013]

[Table 2]

Test pieces were obtained from each of the needle-wirings produced by the above method. The test method will be described below.

(1) Hardness test The surface hardness of each test piece was determined with a micro Vickers hardness meter (load 1 kg). Generally, the higher the surface hardness, the better the abrasion resistance. For the conventional material of No. 8, the test piece was subjected to the required quenching treatment and then subjected to the hardness test. (2) Tensile test The tensile strength and elongation of each test piece were determined by a tensile tester. Generally, the greater the tensile strength, the better the strength and toughness, and the greater the elongation, the better the cold workability. (3) Spinning test Each top cloth was planted on each base wire to produce a top top cloth. At this time, the needle tip shape and size of each needle cloth line are all formed to be the same, and the needle density, the implantation angle, and the needle height to the base cloth are all unified, and the performance of each top cloth is compared. I made it easier. Next, using each top cloth, a spinning test was conducted under the following conditions. Spinning conditions Cylinder rotation speed; 260 rpm Doffer rotation speed; 16 rpm Thekaine rotation speed; 930 rpm Spinning gelation; 380 gelene / 6 yds And abrasion resistance of needle wire at the time of 40 ton treatment of cotton, and nep number were examined. . For abrasion resistance,
Examine the needle tip of the needle wire with a magnifying glass and in order of good wear, ○,
Evaluation was made in three levels of Δ and X. Regarding the number of neps, the number of neps per 200 mg of cotton is counted, and n is 1
The average value of 0 times was calculated. (4) Manufacturing cost comparison The manufacturing cost required to complete the clothing product per unit quantity was calculated for each clothing, and evaluated in three good grades, ○, Δ, and ×.

The results of the above tests (1) to (3) and (4) are summarized in Table 3.

[0017]

[Table 3]

Table 3 shows that each of the materials of the present invention has a surface hardness of 730 Hv or more and a tensile strength of 2500 N / mm ^2.
As described above, the elongation is 5% or more. In addition, wear resistance is about the same as conventional materials, and the number of neps is reduced to about half that of conventional materials.
In addition, the manufacturing cost could be reduced considerably compared to the conventional material. At least one item of surface hardness, tensile strength, and elongation of the comparative material deviates from the standard value of the material of the present invention. No. 3 has considerably poor wear resistance. This is because the content of the additional element C is small. The number of neps is also large. No. 4 is inferior in manufacturing cost. This is because the content of C is too large, so that the elongation is small and the cold workability is poor. No5
Have inferior manufacturing costs. This is because the Si content is too large and thus the elongation is small and the cold workability is poor. No. 6 is inferior in wear resistance. This is because the content of Cr is too small. Also, the number of neps is rather high. No. 7 is inferior in manufacturing cost. This is Cr
This is because the cold workability is poor because the content of is too large.

[0019]

The clothing wire of the present invention has sufficient wear resistance and is excellent in strength and toughness even if the needle tip is not hardened in the manufacturing process of the clothing. Therefore, since there is no softening point as in the conventional case, there is no needle in the carding process, and a good carding action can be maintained for a long time. Further, since it is not necessary to quench the needle tip in the needle cloth manufacturing process, and it is not necessary to apply a hard substance to the surface of the needle cloth, the manufacturing cost can be reduced and an inexpensive needle cloth can be provided. It is an extremely useful invention.

Claims (1)

[Claims] 1. The chemical composition in% by weight of C: 0.50 to 0.
70, Si: 1.20 to 1.60, Mn: 0.50
0.90, Cr: 0.50 to 1.50, balance: Fe and alloy steel which is an unavoidable impurity, and has a uniform surface hardness of 730 Hv or more and a uniform tensile strength in the longitudinal direction of 2500 N / mm. ² or more and uniform elongation of 5%
The above is a high-strength needlework wire characterized by the above.