JPH10156471A - Rod member and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent industrial wastes from generating without generating shavings and chips and to reduce working man-hour, consumable stores and costs by finishing the surface of a rod member formed with machining into a smooth corrugated shape. SOLUTION: The surface of a stock 4 is machined and recessed parts 4a and projecting parts 4b and formed before finishing. The machined stock 4 is inserted into the inserting space of a surface finishing device to internally bring into contact with respective rolls. When the surface finishing device is driven, rolls are brought into contact with the inner surface of a head in accordance with the rotation of a frame and rotated while revoluting, at the same time, the surface of the stock 4 coming into contact internally is rolling-pressed and rolled, the surface of the stock 4 is plastic-deformed and worked. By this way, projecting parts 4b are brought into press-contact, plastic-deformed and formed into a corrugated curve 4c having a smooth corrugated shape, whereby the rod member is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod member and a method of manufacturing the same, and more particularly, to a rod member capable of improving the appearance quality and the like of a rod member formed by finishing a material.

[0002]

2. Description of the Related Art In vehicles, an antenna mast is provided so as to be extendable and contractible.

[0003] The antenna mast is generally manufactured by applying chrome plating to a steel material which is a long and thin metal material. However, when chromium plating is applied to the steel material as described above, there is a problem that the cost is increased. In order to solve this problem, stainless steel as a material excellent in corrosion resistance and workability may be used as it is as the antenna mast.

However, even in the case of a stainless steel antenna mast, a streak-like groove is formed on the surface during processing into a required shape, and water flows along the streak-like groove on the surface. For this reason, there has been a problem that the corrosion resistance of the surface is reduced, the corrosion is caused by acidic rainwater, the appearance quality is reduced, and the antenna function is hindered.

In order to solve this problem, the surface finish of stainless steel is improved by cylindrical polishing, barrel polishing, etc., the surface irregularities are reduced, the appearance quality is improved, and adhesion and accumulation of rainwater etc. are reduced. To prevent corrosion.

As an antenna mast, for example,
It is disclosed in JP-A-8-41598. The publication describes a forming step of forming a raw tube from a high-strength austenitic stainless steel hoop material using a forming apparatus, using a high-strength austenitic stainless steel having a specific chemical composition as a raw material, A pipe drawing step of forming a bull drawn pipe having a desired diameter by passing the pipe through a die while heating the pipe with a preheater, and correcting the bending of the bull drawn pipe using a correction cutting machine, and cutting this to a desired length. And a straightening / cutting process for obtaining a tenana pole.

[0007]

However, conventionally, in a polishing method for finishing the surface of the antenna mast,
In addition to the generation of shavings and chips due to polishing, there has been a problem in that abrasive paper, polishing cloth, abrasives, and the like are consumed, and industrial waste is generated.

Further, as shown in FIG. 11, a concave portion 102a and a convex portion 102 on the surface of a machined material (not shown).
Since only the convex portion 102b in FIG. b is polished (shown by a broken line after finishing), the concave portion 102a remains,
Appearance quality and corrosion resistance decreased. In addition, it is possible to polish without leaving the concave portion 102a, but since the surface is polished deeply, a large amount of industrial waste is generated, the number of processing steps and consumables are increased, the cost is increased, and industrial Was difficult.

Further, the finished surface of the surface is simply a convex portion 102b.
Because it is obtained by the deletion of, the systematically, there is no change, but rather because the work hardened surface obtained at the time of shape processing is deleted, a soft part comes out,
There was a disadvantage that scratch resistance and corrosion resistance were reduced.

[0010]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a rod member formed by machining a surface of an elongated metal material to eliminate the above-mentioned disadvantages. The surface is finished in a smooth wave shape.

Also, a surface finishing device provided with an elongated metal material, a plurality of rollers for processing the surface of the material is provided, the surface of the material is machined, and the surface of the machined material is processed. Is plastically deformed by the rotation of the plurality of rollers of the surface finishing device to finish the surface into a smooth wavy shape, thereby producing a rod member.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, since the surface of a material is plastically deformed by rotating a plurality of rollers of a surface finishing device to finish the surface, no shavings or chips are generated, and industrial waste is generated. In addition to reducing processing man-hours and consumables, it is advantageous in terms of cost, making the surface denser and hardening and leaving compressive stress, improving scratch resistance and corrosion resistance, and further reducing the thickness of thin-walled materials. Enables processing and enables the entire surface of the material to be processed to increase the capability of the surface finishing device.Furthermore, the processing torque of one roller is reduced to enable fine adjustment of the processing degree and wear of the roller. Can be reduced, the material of the roller is not specified, and the cost can be reduced.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; 1 to 10 show an embodiment of the present invention. In FIG. 3, reference numeral 2 denotes a surface finishing device driven by an existing driving device (not shown). This surface finishing device 2 finishes the surface of an elongated metal material 4 (see FIG. 4) to form a rod member 6 (see FIG. 2), and is formed by a head 8 and a head inner surface 8a of the head 8. A plurality of (for example, four) rollers 12 accommodated in the accommodating portion 10 which is a circular space and a frame 14 holding these rollers 12 are provided. As shown in FIGS. 3 to 5, this frame 14 is
4a and a frame retainer portion 14b connected to the frame shaft portion 14a. An insertion space 16 through which the material 4 is inserted is formed in a central portion. The insertion space 16 is rotatably provided in the housing portion 10. The frame retainer portion 14b
A plurality (for example, four) of retainers 14b-1 to 14 that are arranged at equal intervals in the circumferential direction and arrange the rollers 12 at predetermined positions.
4b-4, and each of these retainers 14b-1 to 14b-1
Roller holding spaces 14c-1 to 14c-4 are formed between b-4. Each roller 12 is rotatably provided while being held in each of the roller holding spaces 14c-1 to 14c-4. The head 8 has an insertion hole 18 for inserting the material 4 corresponding to the insertion space 16.

Each roller 12 rotates and revolves with the rotation of the frame 14 in contact with the inner surface 8a of the head. When the material 4 is inscribed, the roller 12 revolves and rotates with the rotation of the frame 14. Then, the raw material 4 is rolled and rolled, and the surface of the raw material 4 is pressed to be plastically deformed and processed to form a rod member 6 requiring appearance quality, corrosion resistance and the like.

The raw material 4 is made of an elongated metal rod or cylinder.
For example, SUS belonging to austenitic stainless steel
304 steel.

The rod member 6 is used, for example, as an antenna mast 20 for a vehicle as shown in FIGS.

The antenna mast 20 has one end held by a neck mold 22, the other end provided to be extendable and contracted, and a middle part supported by a supporter base 24.

One end of a feeder (coaxial cable) 26 is connected to the neck mold 22. The feeder 26 is provided with a plug 28 at the other end. The feeder 28 is supported by a taping member 30 in the middle.

Next, the operation of this embodiment will be described.

First, the surface of the material 4 is usually machined. Thereby, as shown in FIG. 1, the concave portions 4a and the convex portions 4b are formed on the surface of the raw material 4 before finishing.

Then, the machined material 4 is inserted into the insertion space 16 of the surface finishing device 2 as shown in FIGS.

When the surface finishing device 2 is driven, as shown in FIG. 3, the roller 12 revolves while rotating in contact with the head inner surface 8a of the head 8 with the rotation of the frame 14, and at the same time the material inscribed therein. The surface of the material 4 is plastically deformed by rolling and rolling the surface of the material 4 to perform surface processing (roller burnishing).

As a result, as shown in FIG. 1, after finishing, on the surface of the raw material 4, the convex portion 4b is pressed and deformed plastically to form a waveform curve 4c in a smooth wave shape.
Thereby, as shown in FIG. 2, the rod member 6 is formed.

As a result, unlike the conventional method in which the surface of the material is cut and polished, no shavings and chips are generated, the number of processing steps and consumables are reduced, and industrial waste is generated. Can be prevented, and the cost can be reduced.

Further, since the surface of the material 4 is plastically deformed by the pressing of the roller 12, the finished surface is densified and hardened, so that the scratch resistance after the finish is improved and the compressive stress at the time of the finish is reduced. Since it remains, the corrosion resistance of the surface can be improved.

In this embodiment, the following description will be given in order to confirm the operation and effect.

[0027] The material 4 is a SUS304 steel Annatemast 20 belonging to austenitic stainless steel.
With a thin cylindrical member having φ = 6.8 ° and t = 0.3 °, and φ
= 4.6 ° and a thin cylindrical member with t = 0.3 ° are used as samples.

In a thin cylindrical member of φ = 6.8 ° and t = 0.3 °, five rollers 12 of φ = 4.5 ° and L = 30 ° are used, and these rollers 12 are used at 400 to 500 rpm.
Example 1 in which finishing is performed by rotating at φ = 4.6
〓, t = 0.3〓 For a thin cylindrical member, φ = 3.0
〓, L = 30〓 Using three rollers 12 and rotating these rollers 12 at 400 to 500 rpm to finish the example 2 and compare it with various processed products (both examples
Aim for a burnishing amount of 6/100).

First, for a thin-walled cylindrical member having φ = 6.8 ° and t = 0.3 °, an untreated product (NO.
1), this NO. Comparative product 1 (N
O. 2), NO. Comparative Product 2 (No. 3) obtained by subjecting cylindrical polishing (# 180) to No. 1; Comparative Product 3 (No. 4) subjected to cylindrical polishing (# 1000); Comparative Example 4 (No. 5) obtained by applying chromium plating to Example 1 together with the case of Example 1 was subjected to a salt spray test (JIS Z 2371, SIS
N5203) for 2 hours (2H) and hot air drying at 60 ° C. for 4 hours (4H) as one cycle to compare appearance quality and corrosion resistance. In the above-described salt spray test, a salt solution is jetted in a spray chamber to determine corrosion resistance and the like.

On the other hand, in the case of a thin-walled cylindrical member having φ = 4.6 ° and t = 0.3 °, an untreated product (NO.
7), this NO. Comparative product 5 (N
O. 8), NO. Comparative product 6 (NO. 9) obtained by subjecting cylindrical polishing (# 1000) to No. 7; Comparative Example 7 (No. 10) obtained by applying chromium plating to Example 7 was used as Example 2, and the appearance quality and corrosion resistance were compared by a repeated test similar to that of Example 1 described above.

FIG. 9 summarizes the results of comparison between Example 1 and Example 2 described above.

In FIG. 9, a mark Δ indicates that a problem has occurred in appearance quality due to the occurrence of black spots or change to yellow. The X mark indicates that a problem occurred in corrosion resistance due to generation of red rust and the like.

In the thin cylindrical member (NO.1 to NO.6) provided with chrome melody of φ = 6.8 ° and t = 0.3 °, the untreated product was 360 hours (360H) after the start of the test.
This caused a problem with the appearance quality. However, the comparative product 4 plated with chromium was 480 hours after the test was completed (480 hours).
There was no problem until H). The comparative product 2 (# 180) and the comparative product 3 (# 1000) that had been subjected to cylindrical polishing had a problem in appearance quality 360 hours (360H) after the start of the test almost simultaneously with the untreated product. However, in Example 1, there was no problem until 480 hours (480H) at the end of the test, and the appearance quality before the start of the test was maintained and the corrosion resistance was good, like the comparative product 4 plated with chromium.

On the other hand, in the case of the thin-walled cylindrical member having φ = 4.6 ° and t = 0.3 ° (NO.7 to NO.11), the appearance quality of the untreated product was 168 hours (168H) after the start of the test. In 360 hours (360H), red rust occurs, and because of the smaller diameter than the thin cylindrical member with φ = 6.8 ° and t = 0.3, strong processing is applied. It became clear that there was also a problem in corrosion resistance. The comparative product 6 which had been subjected to cylindrical polishing had no problem in appearance quality until 168 hours (168H) after the start of the test, and 480 hours (480H) at the end of the test.
The corrosion resistance was also good up to that point, and the effect was confirmed. However, in Example 2, the test was completed for 480 hours (480 hours).
Until now, it was clear that both the appearance quality and the corrosion resistance were good and the effect was superior to that of cylindrical polishing.

As is apparent from the above description, in the embodiment of the present invention, the antenna mast having the same appearance quality and corrosion resistance as those obtained by applying chromium plating to a steel material and having a low cost is provided. 20 can be easily obtained.

In FIG. 10, the untreated product (NO. 1) before the test, the comparative product 3 (NO. 4) subjected to cylindrical polishing (# 1000), and the example 1 (NO. 6) were compared. 9 shows a surface roughness curve according to an experimental result.

That is, as shown in FIG. 10, the surface (a) before finishing shows rough as well as fine unevenness. On the surface (b) subjected to the cylindrical polishing (# 1000), the rough protrusions disappear as compared with the surface (a) before finishing, but the rough recesses and the fine unevenness remain as they are. Surface (c) finished with the present invention, which is an embodiment of the present invention.
Is finished, leaving a part of the coarse concave part.Especially, all the fine concave and convex parts have disappeared due to the plastic deformation, and the effect of the present invention proves that the plastic deformation of the convex part promotes the plastic deformation of the concave part. doing.

Also, the surface (a) before finishing is not cut, unlike the surface (c) of the present invention according to the embodiment of the present invention.
Since the area is reduced by the pressure contact (roller varnish) of the roller 12, densification and hardening of the surface structure are expected, and the scratch resistance after finishing can be improved. In addition, since compressive stress remains on the surface (c) of the present invention, contrary to cutting, the resistance to corrosion is increased, and the corrosion resistance can be improved.

In the embodiment of the present invention, each roller 1
2 rotates and processes, so it is possible to process small diameter, long and thin material, and it is possible to complete the processing of the entire surface of the material 4 with one processing, and to shorten the processing time and reduce the number of processing steps. Cost can be reduced.

Further, since the surface of the material 4 is processed by the plurality of rollers 12, the processing torque of one roller 12 may be relatively small, the degree of processing may be easily adjusted, and fine adjustment may be possible. .

Further, by reducing the processing torque of one roller 12 as described above, the consumption of the roller 12 is reduced, so that the roller 12 does not need to be made of a special material, and the cost of the apparatus can be reduced. In addition, processing costs and replacement costs of consumables can be reduced.

In the above-described embodiment, four rollers are provided in the surface finishing device. However, the same effect can be obtained by providing two or more than three rollers. May be of any type.

[0043]

As will be apparent from the above detailed description, according to the present invention, the surface of a machined material is surface-finished in a smooth wave shape, or the surface of a machined material is surface-finished by a surface finishing apparatus. Rollers are plastically deformed by roller rolling to finish the surface into a smooth wavy shape, and the rod member is manufactured.This eliminates the generation of shavings and chips, prevents the generation of industrial waste, and reduces processing man-hours and consumption. It reduces the number of products and makes it more cost effective.It also makes the surface denser and hardens and retains compressive stress to improve the scratch resistance and corrosion resistance. The ability of the surface finishing device is enhanced by enabling the entire surface to be processed, and the processing torque of one roller is reduced to enable fine adjustment of the degree of processing and reduce roller wear. And, without specifying the material of the roller may advantageously in terms of cost.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an uneven state of a surface of a material.

FIG. 2 is a partial side view of a rod member.

FIG. 3 is a front view of the surface finishing device.

FIG. 4 is a cross-sectional view taken along line IV-IV of FIG.

FIG. 5 is a perspective view of a frame.

FIG. 6 is a front view of the antenna mast.

FIG. 7 is a left side view of the antenna mast of FIG. 6;

FIG. 8 is a plan view of the antenna mast of FIG.

FIG. 9 is a diagram illustrating comparison of various comparative products.

FIG. 10 is a diagram illustrating a finished state of a surface.

FIG. 11 is a schematic diagram showing a conventional state of unevenness on a surface.

[Explanation of symbols]

 2 Surface finishing device 4 Material 6 Rod member 8 Head 10 Insertion space 12 Roller 14 Frame 20 Antenna mast

Claims (4)

[Claims] 1. A rod member formed by machining a surface of an elongated metal material, wherein the surface of the machined material is finished in a smooth corrugated shape. 2. The rod member according to claim 1, wherein the surface of the material is plastically deformed to finish the surface into a smooth corrugated shape. 3. An elongated metal material is provided, a surface finishing device provided with a plurality of rollers for processing the surface of the material is provided, the surface of the material is machined, and the surface of the machined material is provided. Wherein the plurality of rollers of the surface finishing device are plastically deformed by rotation of the plurality of rollers to finish the surface in a smooth wavy shape, thereby manufacturing a rod member. 4. The rod member according to claim 1, wherein the rod member is used as an antenna mast.