JPH07233447A - Scalped stainless steel wire for drawing and its surface treatment method and device train - Google Patents

Abstract

PURPOSE:To prevent generation of seizure, etc., at the time of drawing by adequately roughening the surface of a scalped stainless steel wire to improve the adhesiveness of a lubricant. CONSTITUTION:A wire S is subjected to setting of out-of-roundness by a die 4 for drawing, then to scalping by an inverted die 6. the wire is then adjusted by a shot blasting device 7 to the surface roughens of 0.8 to 2.5mum Ra stipulated in JIS (Japanese Industrial Standards) B 0601.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stainless wire for wire-drawing and then wire drawing, a surface treatment method for this stainless wire, and an apparatus train for surface treatment.

[0002]

2. Description of the Related Art Generally, hot-rolled stainless wire rods are wire-drawn and used for various purposes. If there is a flaw, it extends to work cracks even if it is minute, so it is necessary to completely remove the surface flaw. For the method of removing surface flaws on stainless wire, see Jpn.
There are known peeling methods according to Japanese Patent No. 6395, Japanese Utility Model Publication No. 50-23405 and Japanese Utility Model Publication No. 52-51352. However, the surface of a wire rod that has been peeled using this technique is extremely smooth, so if a lubricant for wire drawing is applied to this wire, it will be difficult for the lubricant to adhere to it, and the wire will not burn due to poor lubrication during wire drawing. Easy to get stuck. For this reason, conventionally, the surface of the wire after the peeling process has been roughened by pickling. However, in the pickling process, in order to roughen the surface of the stainless wire to the extent that the lubricant is sufficiently adhered,
It requires a lot of processing time (heavy pickling) and is inefficient. Further, the method using the pickling treatment requires high cost because waste liquid treatment is required.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the occurrence of seizure during wire drawing by suitably roughening the surface of a stainless wire to improve the adhesiveness of a lubricant. To do.

[0004]

The stripped stainless wire for wire drawing of the present invention which solves the above-mentioned problems has a surface roughness of JIS.
Ra specified by B0601 0.8 to 2.5 μ
It is characterized by being m. Further, the surface of the wire is coated with a lubricant. Further, the surface treatment method of the stripping stainless steel wire rod for wire drawing of the present invention, after performing the wire drawing process for correcting the wire rod into a perfect circle, perform the skin stripping process for removing the surface flaws of the wire rod, Subsequently, a shot blasting treatment for imparting unevenness to the surface of the wire is performed. Further, after the shot blasting treatment, a lubrication treatment for applying a lubricant to the surface of the wire is performed. Further, it is characterized in that a pickling treatment is carried out after the shot blasting treatment. Also,
The stripping wire rod surface treatment device row for wire drawing includes a rewinding device for rewinding the wire rod, a wire drawing device for straightening the wire rod, a skin stripping device for removing surface flaws of the wire rod, and a surface of the wire rod. It is characterized in that a shot blasting device for giving unevenness and a winding device for winding the wire are sequentially installed. Further, a lubricant applying device for applying a lubricant to the surface of the wire is installed between the shot blasting device and the winding device. In the present invention, as the lubricant applied to the wire rod, various lubricants generally used in wire drawing are used, for example, resin-based lubricants and the like are used.

[0005]

When the surface roughness of the wire is less than 0.8 μm in Ra specified by JISB0601, the lubricant is hard to adhere and seizure is likely to occur during wire drawing. Further, if the surface roughness of the wire exceeds 2.5 μm, the surface of the wire after drawing will be roughened and the gloss will be poor. Therefore, the peeled wire rod for wire drawing of the present invention has a surface roughness Ra of 0.8 to 2.5 μm. According to the method and apparatus for surface treatment of stripped wire rod for wire drawing of the present invention, the wire rod is first straightened by passing through the drawing die. Next, the wire rod is subjected to a peeling process by passing through an upside down die to remove surface flaws. At this time, since the wire rod is formed into a perfect circle, the surface layer is cut and removed with a uniform thickness. For this reason, there are few leftover surface defects, and a small cutting allowance is sufficient, so that the yield is improved.
Since the surface of the stripped stainless steel wire is extremely smooth, it is difficult for the lubricant to adhere as it is. Next, the wire rod is subjected to shot blasting to give unevenness to the surface, so that the lubricant is easily attached. Therefore, if a lubricant is applied to the shot-blasted wire, the necessary amount of the lubricant is evenly attached to the entire surface of the wire, and seizure does not occur during wire drawing. When the shot-blasted wire is subjected to a light pickling treatment, the surface layer processed by peeling and shot blasting is removed, so that the wire drawability is further improved. The particle size φ of the shot projected by the shot blasting treatment is preferably 0.2 to 0.3 mm. If the shot particle size φ is less than 0.2 mm, it is difficult to make the surface roughness of the wire 0.8 μm or more, and if the shot particle size φ exceeds 0.3 mm, the work hardening of the surface of the wire is difficult. It becomes large and the wire drawability deteriorates.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus array of the present invention will be described in detail below with reference to the schematic view shown in FIG. Rewinding device 1 shown in FIG.
Has a reel 2 having a shaft vertically arranged as a main component. The wire drawing device 3 has a drawing die 4 as a main constituent member, and the difference between the hole diameter of the drawing die 4 and the element diameter of the wire S is, for example, 0.30 mm. The peeling device 5
The so-called upside-down die 6 is a main constituent member, and the difference between the hole diameter of the upside-down die 6 and the element diameter of the wire S is, for example, 0.25.
mm. In the shot blasting device 7, a plurality of impellers 8 are arranged in the circumferential direction surrounding the wire rod S so as to be displaced in the line direction. In the winding device 11, the reel 12 having the shaft laid sideways is driven by an electric motor (not shown) to wind the wire rod S while applying tension to the wire rod S. Figure 2
2 shows another embodiment of the present invention, which is different from the device shown in FIG. 1 in that a lubricant applying device 9 is provided between the shot blasting device 7 and the winding device 11. The lubricant applying device 9 includes a spray 10 that applies a lubricant. The wire S is applied with the lubricant by passing through the lubricant applying device 9 in which, for example, a resin-based lubricant or metal soap is sprayed. Lubricant applying device 9
In place of this spray method, a method of dipping in a dipping tank filled with a lubricant may be used. According to the surface treatment device row of the stripping wire rod for wire drawing of the present invention shown in FIGS. 1 and 2, the wire rod S is unwound from the reel 2 of the rewinding device 1 and passes through the die 4 of the wire drawing device 3. After being formed into a perfect circle by doing,
By passing through the upside-down die 6 of the peeling device 5, the surface layer is cut and removed with a uniform thickness, whereby surface flaws are removed and the surface becomes smooth. Next, the wire rod S is provided with irregularities on the surface by the shot projected from the impeller 8 of the shot blasting device 7 to facilitate the attachment of the lubricant, and then the winding device 11 is used in the device row shown in FIG. The reel 12 is wound up. In the device row shown in FIG. 2, after the shot blasting device 7 has performed shot blasting, the lubricant is applied evenly on the entire surface by passing through the lubricant applying device 9, and then wound on the reel 12 of the winding device 11. Taken.

Using the apparatus shown in FIG. 2, a SUSXM7 wire having a wire diameter of 6 mm was discharged from the rewinding device 1 at a linear speed of 120 m / min, and a wire drawing device 3 and a hole diameter using a drawing die 4 having a hole diameter of 5.7 mm were used. After passing through a peeling device 5 using an upside down die 4 of φ5.45 mm, a shot blasting device 7 shots with a grain size φ0.2, 0.3 or 0.5 mm at a projection speed of 70 m / sec. I projected by changing the projection density. Next, the chlorine-based resin is applied to the wire rod S by the spray 10, and then the reel 1 of the winding device 11 is applied.
I wound it up to 2. Table 1 shows the shot particle diameter, the shot projection density, the surface roughness of the wire after the shot blast treatment, the adhesiveness of the lubricant, and the surface properties of the wire after the lubricant is applied and drawn.

[0008]

[Table 1]

In the examples of No. 1 to 5 of the present invention, since the surface roughness after shot blasting is within the range of 0.8 to 2.5 μm (Ra), irregularities of appropriate roughness are formed on the surface of the wire. The applied lubricant was able to be applied evenly over the entire length of the wire. As a result, seizure did not occur during wire drawing after applying the lubricant, and the surface of the wire after wire drawing was clean. On the other hand, in the comparative example of No. 6, the wire rod surface roughness after shot blasting was 2.5 μm (R
Since the value exceeds a), shot marks remained on the surface of the wire material after wire drawing, resulting in rough skin. The comparative example of No. 7 is an example in which shot blasting was not performed, and No. 8
The comparative examples of No. 9 and No. 9 are examples in which pickling treatment is performed instead of shot blasting treatment. In No. 7 and No. 8, the surface roughness was less than 0.8 μm, so that the lubricant did not adhere to a part of the wire. As a result, seizure occurred during wire drawing, and seizure flaws occurred on the surface of the wire after wire drawing, so reprocessing was necessary. No. 9 is pickling 27
In this example, the adhesive property of the lubricant and the surface of the wire material after the wire drawing process are slightly defective.

The lubricant in the present invention is not particularly limited, but is, for example, an inorganic substance such as phosphate, silicate, sulfate, borate and the like, and metal soap, polyethylene, polyamide, polypropylene, phenol, It may be a liquid containing at least one of organic materials such as acryl, polystyrene and vinyl oxalate, and may be partially colloidal.

[0011]

According to the present invention, it is possible to improve the adhesion of the lubricant to the surface of the stripped wire rod.
It is possible to prevent seizure during wire drawing. Particularly, in the production of a wire rod for machine screws, which requires peeling, it is possible to prevent seizure and perform wire drawing. Further, by performing the treatment for imparting irregularities on the surface of the wire material by the shot blast treatment, the production efficiency is improved 1.2 times as compared with the conventional pickling treatment.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing an example of a device of the present invention.

FIG. 2 is a diagram schematically showing another device example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rewinding device 2 ... Reel 3 ... Wire drawing device 4 ... Drawing die 5 ... Peeling device 6 ... Upside-down die 7 ... Shot blasting device 8 ... Impeller 9 ... Lubricant applying device 10 ... Spray 11 ... Winding device 12 … Reel S… Wire

Front page continuation (72) Inventor Takashi Matsui 3434 Shimada, Hikari City, Yamaguchi Prefecture Inside the Nippon Steel Corporation, Nippon Steel Corporation (72) Inventor Kazuhisa Takeuchi 3434 Shimada, Hikari City, Yamaguchi Prefecture Shin Nippon Steel Co., Ltd. Hikari Steel Works

Claims (7)

[Claims] 1. A stripped stainless steel wire rod for wire drawing, having a surface roughness Ra of 0.8 to 2.5 μm as defined by JIS B0601. 2. A stripped stainless steel wire rod for wire drawing, wherein the surface of the wire rod according to claim 1 is coated with a lubricant. 3. A wire drawing process for straightening a wire into a perfect circle, a peeling process for removing surface flaws on the wire, and a shot blasting process for imparting irregularities to the surface of the wire. A surface treatment method for a stripped stainless steel wire rod for wire drawing. 4. A method for surface treatment of a stripped stainless steel wire rod for wire drawing, which comprises performing a lubrication treatment for applying a lubricant to the surface of the wire rod, following the shot blasting treatment according to claim 3. 5. A surface treatment method for a stripped stainless steel wire rod for wire drawing, which comprises performing pickling treatment subsequent to the shot blasting treatment according to claim 3. 6. A rewinding device for rewinding a wire rod, a wire drawing device for straightening the wire rod, a peeling device for removing surface flaws of the wire rod, a shot blasting device for imparting irregularities to the surface of the wire rod, A surface treatment device row for stripping stainless steel wire rod for wire drawing, wherein winding devices for winding the wire rod are sequentially installed. 7. A stripping stainless steel for wire drawing, wherein a lubricant applying device for applying a lubricant to the surface of the wire is installed between the shot blasting device and the winding device according to claim 3. A line of surface treatment equipment for wire rods.