JP2003225703A - Scalping chipper of metal wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scalping chipper of a metal wire capable of preventing generation of ring marks on the circumferential surface of the wire by suppressing any vibration of a blade tip during the scalping operation. <P>SOLUTION: A blade tip constitution part 3 of the chipper 1 used in scalping the wire is formed of an arc-shaped surface of the radius of 0.03-1.0 mm. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chipper for chipping a metal wire, and more particularly to an optimum chipper for chipping a hard metal wire such as titanium or titanium alloy.

[0002]

2. Description of the Related Art In the process of manufacturing a metal wire rod, in order to remove scratches, fine cracks and oxides generated on the surface of the wire rod, the surface layer of the metal wire rod is cut off. When the surface layer of the metal wire is scraped, as shown in FIG. 3, a straightening roll is provided between a supply roll and a take-up roll (not shown), and a skinning chipper 11 provided on the rear side of this straightening roll. The metal wire A fed from the supply roll is introduced therein, the metal wire A is wound by the winding roll and pulled out in the direction of the arrow P to continuously scrape off the surface layer Aa with the cutting edge 12. .

As shown in an enlarged partial view of FIG. 4, the cutting edge 12 has a scooping surface 13a of the cutting edge forming portion 13 and a scooping surface 14a of the cutting edge forming portion 14, and a flank surface 13b of the cutting edge forming portion 13 and the cutting edge portion 14. And the flanks 13b, 14b, and the flanks 13a, 14a and the flanks 13b, 14 respectively.
b are scooping angles θ ₁ and θ ₂ and clearance angles β ₁ and β _{2 respectively.}
It has.

Here, decreasing the scooping angles θ ₁ and θ ₂ means that the cutting edge angle of the cutting edge 11 increases, and conversely, increasing the scooping angles θ ₁ and θ ₂ increases the cutting edge 12 respectively. It means that the cutting edge angle becomes smaller. Therefore, when the scooping angles θ ₁ and θ ₂ become larger than the predetermined angles, the cutting scraps R collide with the scooping surfaces 13a and 14a during the skin scraping, and the discharge thereof is not smoothly performed, and the crater of the scooping surface 13a is particularly large. Wear becomes large and life becomes short. On the contrary, when the scooping angles θ ₁ and θ ₂ are respectively larger than the predetermined angles, the blade tip 12 becomes thin, and the blade tip forming portion 13 and the blade tip portion 1
4 is likely to be chipped.

On the other hand, if the clearance angles β ₁ and β ₂ are respectively smaller than the predetermined angles, the second contact due to the wear of the cutting edge forming portion 13 and the cutting edge portion 14 becomes severe, and the stripped wire A ₂
The wire feeding is not smooth. On the other hand, if the clearance angles β ₁ and β ₂ are each larger than the predetermined angle, the clearance between the scraped wire rod A ₂ will be partially increased and the life will be shortened. Component 1
2. There is a problem that the cutting edge portion 13 is easily chipped.

[0006]

In order to solve such conventional problems, the optimum cutting edge angle and scooping angle θ ₁ , θ ₂ ,
Although various researches and developments have been made on the clearance angles β ₁ and β _{2 in the} past, when the surface has a high hardness such as a wire made of titanium or titanium alloy, the cutting edge angle and the scooping angle θ
_In addition to the problems such as ₁ and θ ₂ and clearance angles β ₁ and β ₂ , the following problems have not been solved yet, and a solution to them is desired.

That is, when the surface layer Aa of the wire A made of a hard material such as titanium or titanium alloy is skinned by the conventional skinning chipper 11 as described above, the surface skin of the wire A ₂ after skinning is obtained. Ring mark occurs. Here, the ring mark is a ring-shaped pattern that occurs on the circumference of the wire rod, and if this ring mark occurs on the circumference of the wire rod, the mark remains in subsequent processing (cold forging, deformation processing, etc.), It was a problem in appearance.

The present invention has been made in order to solve the above-mentioned conventional problems. Particularly, when a hard metal wire rod such as titanium or titanium alloy is shaved, a ring mark is generated on the circumference of the wire rod. It is intended to provide a non-shaving chipper.

[0009]

In order to achieve the above-mentioned object, the first invention of the present application is a chipper used for scraping a metal wire, the tip of the chipper having a radius of 0.03 ~.
A chipping chipper for a metal wire rod, which is characterized by being formed with an arc surface of 1.0 mm. As a result, slight vibration of the cutting edge (vibration in the longitudinal direction of the wire rod) during skin cutting can be suppressed, and ring marks can be prevented from occurring on the surface skin of the wire rod after skin cutting.

The second aspect of the present invention for achieving the above object
The invention is a chipper used for skinning of a metal wire rod, wherein the tip of the chipper is composed of a blade tip forming portion formed by an arc surface having a radius of 0.03 to 1.0 mm and a blade tip portion continuous to the rear portion thereof. The metal wire rod chipping chipper is characterized in that it is formed so that the angle difference between the rake angle and the clearance angle between the blade edge forming portion and the blade edge portion is small.

With the above structure, the scooping surface of the cutting edge forming portion, the scooping surface of the cutting edge portion continuing to the rear portion thereof, and the flank surface of the cutting edge forming portion and the connection portion of the flank surface of the cutting edge portion continuing to the rear portion thereof are respectively close to each other.ゞ Continuously in a straight plane, cutting chips are discharged and cutting wire is fed smoothly. Therefore, while continuous skinning can be performed at high speed, slight vibration of the cutting edge during skinning can be more reliably suppressed, and ring marks can be prevented from occurring on the surface skin of the wire material after skinning. .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the embodiments shown in FIGS. 1 and 2. In the drawings, 1 is a chipping chipper, and its cutting edge 2 is a cutting edge forming portion 3 at the tip.
And a blade edge portion 4 continuous to the rear portion thereof, and the blade edge forming portion 3 is formed of an arc surface described later. Three
a is a scooping surface of the cutting edge forming portion 3, 3b is a flank surface,
4a is a scooping surface of the cutting edge portion 4, 4b is also a flank, and the scooping surfaces 3a, 4a and the flanks 3b, 4b are respectively provided with scooping angles θ ', θ and clearance angles β', β. is there.

The cutting edge forming portion 3 forming the tip end of the cutting edge 2 is formed of an arcuate surface having a radius of 0.03 to 1.0 mm, whereby the scraping chipper 1 scrapes the wire A. It is possible to suppress a slight vibration of the cutting edge 2 that occurs at the time, and it is possible to prevent a ring mark from being generated on the surface skin of the wire rod A ₂ after being scraped. More specifically, it is considered that the ring mark is generated on the surface skin of the wire material A ₂ after the skinning is caused by the vibration of the cutting edge 2 (particularly the vibration in the longitudinal direction of the wire material) during cutting. Therefore, in the present invention, the generation of vibration of the cutting edge 2 at the time of cutting is suppressed by rounding the cutting edge forming portion 3 that constitutes the tip portion of the cutting edge 2.

The size of the circular arc surface of the cutting edge forming portion 3 is determined by the peeling force applied to the metal wire rod to be peeled. That is, when the radius of the circular arc surface of the cutting edge forming portion 2 is less than 0.03 mm, the skin cutting force is too large to achieve smooth cutting, and a slight vibration occurs in the cutting edge 2 during skin cutting, and as a result, Ring marks appear on the surface skin. On the contrary, if the radius of the circular arc surface of the cutting edge forming portion 3 is larger than 1.00 mm, the skin cutting force is too small and the skin cutting effect cannot be expected. Therefore, the radius of the circular arc surface is set to 0.03 to 1.0 mm.

Further, by forming the cutting edge forming portion 3 into an arc surface having a predetermined radius, the angle difference (θ-θ ') between the scooping angle θ'of the scooping surface 3a and the scooping angle θ of the scooping surface 4a, and the above. The angle difference (β−β ′) between the clearance angle β ′ of the clearance surface 3b and the clearance angle β of the clearance surface 4b can be reduced.
Decreasing the angle difference between the scooping angle θ ′ of the scooping surface 3a and the scooping angle θ of the scooping surface 4a means that the scooping angle θ ′ of the scooping surface 3a.
Can be increased, and that the angle difference between the clearance angle β ′ of the clearance surface 3b and the clearance angle β of the clearance surface 4b can be reduced means that the clearance angle β ′ of the clearance surface 3b can be reduced.

Therefore, even if the scooping surface 4a of the cutting edge portion 4 constituting the cutting edge 2 is a constant inclined surface having a predetermined inclination angle, the scooping of the cutting edge constituting portion 3 located at the tip of the cutting edge portion 4 is performed. When the connecting portion between the surface 3a and the scooping surface 4a is substantially straight and continuous, the flank surface 4b of the cutting edge portion 4 is composed of a constant inclined surface having a predetermined inclination angle. Even if there is, the connecting portion between the flank 3b of the cutting edge forming portion 3 and the flank 4b is also continuous with a substantially straight surface.

That is, in this seed-shaving chipper, it was found that the scooping angle θ of the scooping surface 4a is 40 to 50 ° and the clearance angle β of the flank 4b is 3 to 10 °, but the cutting edge 2 When the cutting edge forming portion 3 that constitutes the tip of the blade is formed by an arcuate surface having a radius of 0.03 to 1.0 mm, the scooping angle θ ′ of the scooping surface 3a and the clearance angle β ′ of the flank 3b are the scooping surface. It is easy to form the scooping angle .theta. Of 4a and the clearance angle .beta. Of the flank 4b to about the same size or slightly smaller. Therefore, the angle difference of the scooping angle (θ−θ ′) and the angle difference of the clearance angle (β−β ′) can be reduced, respectively. However, in the result of the experiment, the angle difference of the scooping angle and the clearance angle of the clearance angle can be reduced. The angle difference is 0 ° ~
The case of 10 ° was the best.

As a result, the scooping surface 3a of the cutting edge forming part 3 and the scooping surface 4a of the cutting edge part 4 continuing to the rear part thereof, the flank surface 3b of the cutting edge forming part 3 and the flank surface 4b of the cutting edge part 4 continuing to the rear part thereof. Since the respective connecting portions are continuous in a substantially linear plane, the discharge of the cutting waste R generated when cutting the surface layer Aa of the wire A and the wire feeding of the cutting material become smooth. As a result, vibration in the longitudinal direction of the wire rod generated at the cutting edge 2 during cutting is further suppressed, and crater wear on the scooping surfaces 3a and 4a is reduced, resulting in a long life. In addition, the cutting edge forming portion 3 that forms the tip of the cutting edge 2
Is formed by an arcuate surface having a radius of 0.03 to 1.0 mm, and more preferably the radius of the cutting edge forming portion 3 is 0.05 to 0.
It is preferable to set it to 5 mm.

[0019]

[Examples] Table 1 shows an experimental example of the presence or absence of ring marks when cut with the skin-cutting chipper of the present invention and the skin-cutting chipper of the comparative example, respectively. In this experiment, a pure titanium wire rod having a diameter of 5.5 mm formed by hot rolling was heat-treated, passed through a cemented carbide chipping chipper at a high speed of 80 m / min, and cut to a diameter of 5.2 mm. .

[0020]

[Table 1]

The results are as shown in Table 1. Whether the ring chip is attached to the circumferential surface of the wire rod at all in the chipping chipper of the present invention having a circular arc surface with a radius of 0.03 to 1.0 mm at the cutting edge. However, the marks did not remain after cold forging or deforming. In particular, it can be seen that no ring mark is generated on the circumferential surface of the wire when the radius of the cutting edge is in the range of 0.05 to 0.5 mm.

[0022]

EFFECTS OF THE INVENTION Since the metal wire rod chipping chipper according to the present invention has the above-described structure, the discharge of cutting chips and the wire feeding of the cutting material are performed smoothly, and the cutting edge of the cutting edge during the skin cutting is small. Vibration is surely suppressed. Therefore, it is possible to obtain a high-skin quality wire material having no ring marks on the surface skin of the wire material after being skinned, and at the same time, it is possible to perform continuous cutting at high speed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a skin-cutting state of a skin-cutting chipper according to the present invention.

FIG. 2 is an enlarged cross-sectional partial view showing a main part of the same leather chipper.

FIG. 3 is a cross-sectional view showing a state where a conventional skin-shaving chipper is skin-shaving.

FIG. 4 is an enlarged sectional partial view showing a main part of the same skin-cutting chipper.

[Explanation of symbols]

1 Metal wire rod scraping chipper 2 cutting edge 3 Cutting edge component 3a, 4a Scooping surface θ ', θ rake angle 3b, 4b flank β ', β clearance angle 4 cutting edge

Claims (2)

[Claims] 1. A chipper used for skinning a metal wire rod, wherein the tip of the chipper has a radius of 0.03 to 1.0 mm.
A metal wire rod chipping chipper that is characterized by being formed with an arc surface. 2. A chipper used for skinning a metal wire rod, wherein the tip of the chipper has a radius of 0.03 to 1.0 mm.
If it is composed of a blade edge forming portion formed of an arcuate surface and a blade edge portion continuous to the rear portion thereof, the angle difference between the rake angle and the clearance angle between the blade edge forming portion and the blade edge portion will be reduced respectively. A metal wire rod chipper characterized by being formed.