JPH0361524B2 - - Google Patents

Description

[Detailed description of the invention]

"Industrial Application Field" The present invention relates to a method for manufacturing a deformed wire such as a deformed steel wire, which reduces die wear and prevents seizure, and which has uniform internal strength. "Prior Art" Conventionally, as an example of a method for producing a deformed steel wire, a method is known in which a round wire is heat treated and then drawn using a deformed die. ``Problems to be Solved by the Invention'' In the conventional method described above, since round wire is processed into deformed steel wire, the process tends to be uneven, resulting in uneven internal hardness distribution, and The disadvantages were that the contact pressure between the die and the wire increased locally, causing seizure, and that the die wore out quickly. Furthermore, in the wire drawing process of irregularly shaped wires, die pressure is locally high, so there is a problem in that an expensive lubricant with excellent lubricity must be used. In addition, as shown in Japanese Patent Publication No. 59-53332, a modified cross-sectional strip having a cross-sectional shape similar to that of the modified steel wire to be finally produced is manufactured, and this modified cross-sectional strip is subjected to a patenting treatment. A method of wire drawing is known. Although this method can improve the uniformity of processing compared to the conventional method of reducing the diameter from a round wire to a strip of irregular cross-section, it still has the problem of easily causing seizure and uneven internal hardness. Ta. The reason why sticking occurs easily when wire drawing is performed with similar shapes is shown in Figures 9 and 10.
This is presumed to be due to the reasons explained below based on the example shown in the figure. The cross section shown in Figure 9A is 20 mm long and 40 mm wide.
The baseline 15 is the cross section shown in FIG.
When drawing a wire 16 of a similar shape with a width of 20 mm and a width of 20 mm using a die, the contact state between the die and the base line 15 is as shown in FIG. 10A in the horizontal direction, and as shown in FIG. It seems to be as shown in Figure 10B. That is, in the wire drawing process using the die 21, the horizontal dimension reduction shown in FIG. 10A reduces the horizontal dimension of the base line 15 from 40 mm to 20 mm, and the vertical dimension reduction shown in FIG. 10 B reduces the horizontal dimension of the base line 15. Vertical dimension 20
mm will be reduced to 10mm. Therefore, the first
As shown in Figures A and B, the base line 15 is the die 21.
The position at which the metal reaches the die hole is different in the vertical and horizontal directions. In this case, since the machining start portion is different in the vertical and horizontal directions, the machining becomes uneven and it is thought that burn-in occurs. The present invention was made in view of the above problems, and
It is an object of the present invention to provide a method for manufacturing a modified cross-section wire with uniform internal strength while reducing die wear and preventing seizure. "Means for Solving the Problems" In order to solve the above-mentioned problems, the present invention creates a base line from the seed wire by wire drawing, and further performs wire drawing on this base line using a die. In a method for manufacturing a modified cross-sectional wire having a cross-sectional shape other than a square, the wire having a cross-sectional shape surrounded by two or more sides, the plurality of A base line of a cross-sectional shape consisting of each side of the base line is made by extending the same length from the seed wire by wire drawing, and this base line is subjected to a patenting process. A wire with an irregular cross section is obtained by drawing the wire so that each side is shortened by the same length. "Operation" If the method of the present invention is carried out, the diameter of each side of three or more sides constituting the cross section of the base line will be reduced by the same dimension, so each side of the base line will be uniformly reduced in diameter. Since the diameter of the base line is reduced to the same thickness, the wire drawing process is performed smoothly, seizure and die wear are prevented, and the internal strength is made uniform. "Example" Figure 1 is for explaining an example of the present invention, and shows how to carry out the method of the present invention to produce the deformed steel wire (deformed cross section wire) 1 shown in Figure 1c. ,first,
A seed line 2 having a circular cross section is subjected to a diameter reduction process using a die to produce a base line 3 shown in FIG. 1b. This base line 3 is the deformed steel wire 1 to be finally manufactured.
It has a cross-sectional shape in which the dimensions of the sides in the vertical direction (vertical direction in FIG. 1) and the dimensions in the horizontal direction (horizontal direction in FIG. 1) in the cross section are each increased by the same value. That is, the die hole of the die for reducing the diameter of the seed wire 2 has the dimensions of each vertical side and each horizontal side of the cross section of the deformed steel wire 1 to be finally manufactured. The base line 3 is produced by drawing the seed wire 2 as described above using this die. Next, this base line 3 is subjected to a patenting process to improve wire drawability, and then a die hole is formed that is slightly smaller than the die hole of the die having increased diameter to the same thickness as described above, and the deformed steel wire 1 to be finally manufactured is The deformed steel wire 1 shown in FIG. 1c is manufactured by wire drawing using a die having a die hole having the same cross-sectional profile as the cross-sectional profile of the wire. When performing diameter reduction processing on the base line 3 as described above, the diameter reduction ratio of the horizontal side is different from the diameter reduction ratio of the vertical side along the cross section of the base line 3, but the diameter reduction dimension of the vertical side is Since the diameter reduction dimension of the horizontal side is the same, the diameter is reduced uniformly in both directions (that is, around the entire circumference). Therefore, during the wire drawing process from the base line 3 to the deformed steel wire 1, there is no seizure on the die, and die wear is reduced, and the diameter can be reduced uniformly by the die, resulting in a deformed steel wire with uniform internal strength. Wire 1 can be manufactured. In addition, in the wire drawing process, the cross-sectional reduction rate was set to 15
Wire drawing is performed in the range of ~25%. Here, the reason why the area reduction rate is limited to the above range is that if it exceeds 25%, the pull-out force required for processing the cord will become large, and the breaking tension of the wire will be exceeded, making it impossible to process the cord.
This is because the lubricating film between the die and the die may be destroyed and seizure may occur, and if it is less than 15%, processing will only be performed near the outer periphery of the wire.
This is because defects are likely to occur in the center of the core material. "Manufacturing Example 1" The method described above was applied to a round wire with a diameter of 9.5 mm having a composition of 0.73%C, 0.24%Si, 0.74%Mn, and the balance Fe, and the hard steel wire was processed as shown in Figure 1. was manufactured. First, the diameter of the round wire is reduced using a plurality of dies into an irregular wire having a rectangular cross section of 7.3 x 5.3 mm, and then a patenting process is applied thereto. A deformed steel wire with a rectangular cross section of 2 mm was manufactured. In addition, the area reduction rate of each die is 15 to 25.
%, and the shape of the die hole of each die is formed by increasing the diameter to the same thickness as the cross-sectional shape of the deformed steel wire to be finally produced.
FIG. 4 shows the results of measuring the hardness distribution of the deformed steel wire produced in this manner. For comparison, two types of deformed steel wires were manufactured according to the conventional method described below, and the hardness distribution was measured. The results are shown in FIGS. 5 and 6. Of the two types of deformed steel wire manufactured according to the conventional method, the first deformed steel wire was reduced in diameter from a round wire 5 with a diameter of 9.5 mm to a round wire 6 with a diameter of 7.0 mm, as shown in Fig. 2. After applying the patenting process to the round wire 6,
It was produced by reducing the diameter of the wire into a deformed steel wire 7 with a rectangular cross section of 4 x 2 mm using a die. This first
Figure 5 shows the hardness distribution of the deformed steel wire. Of the two types of deformed steel wire manufactured according to the conventional method, the second deformed steel wire is made by drawing a round wire 10 with a diameter of 9.5 mm to 8.6 mm as shown in FIG.
A deformed wire 11 with a rectangular cross section of ×4.3 mm (a deformed wire with a similar shape to the deformed steel wire to be finally produced) is produced, and then a patenting process is applied.
A deformed steel wire 12 with a rectangular cross section of 2 mm was manufactured. The hardness distribution of this deformed steel wire is shown in FIG. In Figures 4, 5, and 6, the ○ mark indicates the value of the Vickers hardness measured in the major axis direction of the obtained deformed steel wire, and the × mark indicates the value measured in the short axis direction of the obtained deformed steel wire. It shows the value of Bitkers hardness. Comparing Figures 4 to 6, in the examples shown in Figures 5 and 6, the hardness fluctuates in the major axis direction and the minor axis direction, and the mechanical hardness is unbalanced within the cross section. This indicates that the material is non-uniform (non-uniform). In comparison, the manufacturing example shown in FIG. 4 has less variation in hardness in the major axis direction and the minor axis direction. That is, the deformed steel wire manufactured by applying the method of the present invention has uniform hardness in each part compared to the deformed steel wire manufactured by applying the conventional method, and the effect of the method of the present invention is demonstrated. It became clear. Furthermore, among the dies used to process the deformed steel wires of each of the above examples, the dies used to carry out the method of the present invention were 4t.
The die used to manufacture the first irregularly shaped wire manufactured by the conventional method can process a 15t wire rod, and the die used to manufacture the second irregularly shaped wire can process 15 tons of wire rod. We were able to process 25 tons of wire. These results revealed that the method of the present invention extends the life of the die. "Production Example 2" In addition to carrying out the same method as the above production example, the lubricant used for the die during wire drawing was a regular solid lubricant (stearic acid type) and a solid lubricant containing molybdenum disulfide. They were used separately to produce deformed steel wires. The results are shown in Table 1.

[Table] From Table 1, it is clear that seizure does not occur in the method for manufacturing deformed steel wires applied to the method of the present invention. Therefore, in the conventional method, it was necessary to use an expensive lubricant using molybdenum disulfide, but by implementing the present invention,
This allows the use of ordinary, inexpensive lubricants, which has the effect of reducing manufacturing costs. Here, in the case of wire drawing with equal thickness as described above, the relationship between the die and the base line is the seventh
Based on the example shown in the figure and FIG. 8, it is assumed that the state is as described below. Here, the cross section shown in Figure 7A is 24 mm vertically.
When drawing the base line 17 of 34 mm wide and 34 mm wide with a die to the cross section shown in FIG.
It seems that the contact state is as shown in FIG. 8A in the horizontal direction and as shown in FIG. 8B in the vertical direction. That is, in the horizontal reduction shown in FIG. 8A, baseline 1
Reduce the horizontal dimension of 7 from 34mm to 20mm, and make
In the vertical reduction shown in , the vertical dimension of base line 17 is 24 mm.
will be reduced to 10mm. Therefore, as shown in FIGS. 8A and 8B, the diameter is reduced by the same value (14 mm) in the vertical and horizontal directions, and in this case, the position where the outer peripheral part of the base line 17 reaches the die hole of the die 21 can be estimated to be at the same position in the vertical and horizontal directions along the drawing direction. That is, it can be assumed that uniform processing progresses as a result of the base line 17 reaching the die hole at the same time in both the large-sized portion and the small-sized portion. "Effects of the Invention" As explained above, the present invention has the advantage of increasing the vertical side dimension and the horizontal side dimension along the cross section of the irregular cross-sectional wire to be manufactured by the same dimension and equal thickness. A base line with a diameter dimension is created, and this base line is subjected to a patenting process and further subjected to a wire drawing process. In other words, in addition to improving wire drawability through the panting process, it is also possible to uniformly reduce the diameter by the same dimension along the vertical and horizontal sides of the base line, resulting in a deformed wire with uniform internal strength. It is effective in manufacturing. Furthermore, since the diameter can be reduced uniformly, die wear and seizure can be prevented, resulting in the effect of extending the life of the die and reducing manufacturing costs. In addition, in the conventional method, it was necessary to use an expensive lubricant when drawing the base line, but by implementing the method of the present invention, it is now possible to use a regular inexpensive lubricant. This has the effect of reducing manufacturing costs.

[Brief explanation of drawings]

Figures 1a to 1c are for explaining one embodiment of the present invention, and Figure 1a is a cross-sectional view along the seed line;
Figure b is a cross-sectional view of the base line, Figure 1 c is a cross-sectional view of the deformed steel wire, and Figure 2 is for explaining the manufacturing procedure of the first deformed cross-sectional wire based on the conventional method. a
is a cross-sectional view of the seed line, Figure 2b is a cross-sectional view showing the seed line in the middle of diameter reduction, Figure 2c is a cross-sectional view of the deformed steel wire,
Fig. 3 is for explaining the manufacturing procedure of the second irregular cross-section wire based on the conventional method, Fig. 3a is a cross-sectional view of the seed wire, and Fig. 3b shows the seed wire in the middle of diameter reduction. FIG. 3c is a cross-sectional view of the deformed steel wire, FIG. 4 is a diagram showing the hardness measurement results of the deformed steel wire manufactured by the method of the present invention, and FIG. Fig. 6 is a diagram showing the hardness measurement results of the first deformed steel wire manufactured by applying the conventional method; 7A and 7B are cross-sectional views showing examples of baselines for estimating the wire drawing state in the present invention, and FIGS.
B is an explanatory diagram showing an example of estimating the state in which the wire drawing process is performed using the baseline shown in FIG. 7, and FIGS. 9A and B are cross-sectional views showing examples of the baseline for estimating the conventional wire drawing state. , FIGS. 10A and 10B are explanatory diagrams showing an estimation example of a state in which the base line shown in FIG. 9 is wire-drawn. 1... Deformed steel wire (deformed cross section wire), 2... Seed wire,
3...Baseline.

Claims (1)

[Claims] 1. Create a base line from the seed wire by wire drawing, and further perform wire drawing on this base line using a die, 3.
In a method for manufacturing a modified cross-sectional wire having a cross-sectional shape other than a square, the wire having a cross-sectional shape surrounded by two or more sides, the plurality of wires constituting the cross-section of the modified cross-sectional wire in the final shape after wire drawing. The base line of the cross-sectional shape is made up of the same length of each side,
The method is characterized in that it is made from a seed wire by wire drawing, this base line is subjected to a patenting process, and then the wire is drawn so that each side of the cross section of the base line is shortened by the same length to obtain an irregular cross-sectional line. A method for manufacturing irregular cross-section wire.