JP2634566B2 - End structure of rod member, manufacturing method and manufacturing apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end structure of a rod member cut to a predetermined size from a base material by shearing, a manufacturing method and a manufacturing apparatus.

[0002]

2. Description of the Related Art As a conventional technique, there is, for example, one shown in FIGS. That is, as shown in FIG. 14, a tapered surface 3 is formed on the upper end by a shearing upper blade at the end 2 of the rod member 1 cut to a predetermined size from the base material by shearing, and conversely, A sag surface 4 is formed on the side by the lower blade. On the other hand, the side portion of the end portion 2 is left open, and has the same outer diameter or has burrs or deformation projecting therefrom.

If an attempt is made to extrapolate a washer or the like to such an end portion 2, there is no escape, so that extrapolation is difficult or impossible.

Therefore, as shown in FIG. 15, it is common to form a chamfered portion 5 by machining a corner of the end 2 separately.

[0005]

However, such a conventional technique requires a separate machining process after the rod member is cut off from the base material by shearing, which increases the cost. was there.

The present invention has been made in view of such a conventional problem, and a rod member capable of forming a clearance at an end portion during a shearing process without requiring a separate step. It is an object of the present invention to provide an end structure, a manufacturing method and a manufacturing apparatus.

[0007]

The gist of the present invention for achieving the above object lies in the following items.

In the end structure of the rod member (20, 20a) cut off from the base material to a predetermined size by shearing, the rod member (2) provided on the upper blade (45) is provided.
Main blade (48a) which abuts to shear 0,20a)
(22, 22)
a) and the sag surface (23, 23a) formed on the back side when the lower blade (55) bites into the rod member (20, 2).
0a) are formed above and below the ends (21, 21a) with a clearance smaller than the outer diameter thereof, and are formed on the upper blade (45) and the convex blade (48) extending in the cutting direction and the lower blade (55). The rod members (20, 20) are formed by the side blades (48b, 58b) with the concave blade portions (58) corresponding to the formed convex blade portions (48).
The side taper surfaces (24, 24a) are formed on both sides of the end (21, 21a) of a) during shearing to form a side clearance, and the outer periphery of the end (21, 21a) is larger than its outer diameter. A rod member (20, 2) characterized in that it is made smaller.
0a) End structure.

2 In a method for manufacturing a rod member (20, 20a) cut off from a base material to a predetermined size by shearing, the rod member (2,
Main blade (48a) which abuts to shear 0,20a)
(22, 22)
a) and the sag surface (23, 23a) formed on the back side when the lower blade (55) bites into the rod member (20, 2).
0a) are formed above and below the end portions (21, 21a) with a clearance smaller than the outer diameter thereof, and are formed on the upper blade (45) and the convex blade portion (48) extending in the cutting direction and the lower blade (55). The rod members (20, 20) are formed by the side blades (48b, 58b) with the concave blade portions (58) corresponding to the formed convex blade portions (48).
The side tapered surfaces (24, 24a) are formed on both sides of the end (21, 21a) of a) during shearing to form a side relief, and the outer circumference of the end (21, 21a) is larger than its outer diameter. A rod member (20, 2) characterized in that it is made smaller.
0a).

[0010] 3 Cut to a predetermined size from the base material by shearing processing, the end (21, 2) of the rod member (20, 20a)
An apparatus for manufacturing a rod member (20, 20a) that forms a clearance smaller than its outer diameter above and below 1a), wherein the rod member (20, 20a) is formed to form a tapered surface (22, 22a) in a cutting direction. An upper blade (45) having a main blade (48a) abutting so as to shear, and a lower blade (55) forming a sagging surface (23, 23a) on the back side when biting.
The upper blade (45) is formed so that a side taper surface (24, 24a) is formed on both sides of the end (21, 21a) of the rod member (20, 20a) when shearing to form a side relief. A convex blade (48) extending in the cutting direction and side blades (48b, 58b) of a concave blade (58) corresponding to the convex blade (48) formed on the lower blade (55) are provided. 2
An apparatus for manufacturing a rod member (20, 20a), wherein the outer circumference of the rod member (1, 21a) is smaller than its outer diameter.

[0011]

The rod members (20, 20a) are cut into a predetermined size from the base material by a shearing process, and are cut at the distal end of the base material and the base ends (21, 21a) of the rod members (20, 20a). The shearing cut remains.

In this cut, the tip of the upper blade (45) is cut above and below the ends (21, 21a) when cutting.
1, 21a), thereby forming a tapered surface (22, 22a) in the cutting direction, while the lower blade (55)
Bites into the ends (21, 21a) when the ends (21, 21a)
21a) is drawn in to form a sag surface (23, 23a) on the back side.

A side of a convex blade (48) formed in the cutting direction formed on the upper blade (45) and a concave blade (58) corresponding to the convex blade (48) formed on the lower blade (55). Blade (48
b, 58b) and the base material and the rod member (20, 20a)
When the end (21, 21a) of the rod member (20, 20a) is cut off, side tapered surfaces (24, 24a) are formed on both sides of the end (21, 21a) of the rod member (20, 20a).

The tapered surfaces (22, 22a) and the sagging surfaces (23, 23a) surround the outer periphery of the cut end of the end (21, 21a) of the rod member (20, 20a). , 21a) are smaller than their outer diameters.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of the present invention will be described below with reference to the drawings. 1 to 9 show a first embodiment of the present invention. First, the manufacturing apparatus will be described for easy understanding. 7 to 9 show an example of the manufacturing apparatus 30, which cuts the rod member 20 from the base material 10 to a predetermined size by shearing.

As shown in FIG. 8, the manufacturing apparatus 30 includes an upper mold 40 which is driven up and down and has a flat upper blade 45 firmly fitted to a base 41, and a lower part which is settled in a storage portion 52 of the base 51. Lower mold 5 fitted with blade 55 and fixed with presser nuts 53a, 53b
0.

As shown in FIG. 7, a lower portion at the center of the upper blade 45 is cut out to form an insertion notch 46 of the rod member 20. The insertion notch 46 faces the insertion notch 46 and protrudes from a front surface 47 of the upper blade 45. A convex blade portion 48 extending in the cutting direction of the mold 40 is formed.

The convex blade portion 48 has a main blade 48a at the center and side blades 48b, 48b rising from the front surface 47.
Has made.

The lower blade 55 is fitted into the accommodating portion 52 of the base body 51, and presses the rear end flange 56 with holding nuts 53a, 53a.
b, the tip surface 57 slightly protrudes from the front surface of the base body 51, and is recessed into the center of the tip surface 57 from the tip surface 57 to correspond to the convex blade portion 48 of the upper blade 45 of the upper die 40. A blade portion 58 is formed.

The central portion of the concave blade portion 58 is the main blade 58a, and the portions that fall from the front end surface 57 are the side blades 58b, 58b.
Has made.

Next, the rod member 20 will be described. The rod member 20 is successively cut off from the base material 10 by shearing. The cut end of the rod member 20 cut off from the base material 10 is as follows.

As shown in FIGS. 1 to 5, in the vertical direction of the end 21, the tapered surface 22 is formed in the cutting direction by the main blade 48 a of the convex blade 48 of the upper blade 45, and the main surface of the concave blade 58 is formed. When the lower blade 55 bites in during shearing by the blade 58 a, a sagging surface 23 is formed on the back side of the end portion 21, and the tapered surface 22 and the sagging surface 23 allow the upper and lower ends of the rod member 20 to become smaller than the outer diameter thereof. Are formed.

In the lateral direction of the end portion 21, the side blades 48b, 48b of the convex blade portion 48 of the upper blade 45 and the side blades 58b, 58b of the concave blade portion 58 of the lower blade 55 are engaged by a shearing action. Side tapered surfaces 2 on both sides of end 21 of rod member 20
4, 24 are formed.

The tapered surface 22, the sagging surface 23, and the side tapered surfaces 24, 24 form the outer periphery of the cut at the end 21, so that the outer periphery of the cut has all the relief smaller than the outer diameter of the end 21. It is formed around the circumference.

As shown in FIG. 6, the cut edge of the base material 10 from which the rod member 20 has been cut is cut into the flat portion 1 which is sheared by the main blade 48a of the convex blade portion 48 and the main blade 58a of the concave blade portion 58.
1 from both sides, the side blades 48b, 48b and the main blades 58a, 58
The protrusions 12, 12 sheared by b protrude.

Next, the operation will be described. As the upper die 40 shown in FIGS. 8 and 9 is lowered, the rod member 20 is cut off from the base material 10 to a predetermined size by shearing, and the tip end of the base material 10 and the end 21 of the base end of the rod member 20 are formed. The shearing cut remains.

Above and below the end portion 21, the upper blade 4
The main blade 48a of the protruding blade portion 48 at the tip of 5 presses the end portion 21, whereby the tapered surface 22 is formed in the cutting direction. On the other hand, when the main blade 58a of the concave blade portion 58 of the lower blade 55 bites into the end portion 21 as a reaction force, the end portion 21 is pulled in and the sagging surface 23 is formed on the back side.

When the upper die 40 and the upper blade 45 descend, the side blades 48b, 48b of the convex blade portion 48 of the upper blade 45 and the lower blade 55
When the side blades 58b and 58b of the concave blade portion 58 are engaged with each other and the base material 10 and the end portion 21 of the rod member 20 are cut off by shearing therebetween, the side portions are provided on both sides of the end portion 21 of the rod member 20. Tapered surfaces 24, 24 are formed.

The tapered surface 22, the sagging surface 23, and the side tapered surfaces 24, 24 surround the outer periphery of the cut at the end 21 of the rod member 20, and the outer periphery of the cut at the end 21 is smaller than its outer diameter. I have.

When a washer or the like is extrapolated from the end 21 to the rod member 20, the tapered surface 22, the sagging surface 23, and the side tapered surfaces 24, 24 serve as small-diameter guides, and can be easily inserted.

FIGS. 10 to 13 show a second embodiment, which is directed to a prismatic rod member 20a. In the present embodiment, a tapered surface 22a, a sagging surface 23a,
In the lateral direction, side tapered surfaces 24a, 24a are formed.

In the above-described embodiment, the portion for pushing the end of the rod member at the tip of the main blade of the upper blade has an inclination, but when pushed to this portion, the end of the rod member is deformed by a shear load. In general, it is possible to form a tapered surface at an angle given to a cutting edge.

In the above description, the upward and downward directions are shown for convenience of explanation. However, in practice, the direction may be changed as appropriate, and the same result can be obtained by moving the lower blade. be able to.

[0034]

According to the end structure of the rod member according to the present invention, the taper surface and the sag surface are formed at the end cut of the rod member at the time of shearing, and the outer periphery of the cut is smaller than the outer diameter of the end. Therefore, a separate process for terminal processing is not required, and the processing process can be simplified and cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of an end of a rod member according to a first embodiment of the present invention.

FIG. 2 is a plan view of an end portion of the rod member according to the first embodiment of the present invention.

FIG. 3 shows a rod member according to a first embodiment of the present invention,
FIG. 3 is a view taken in the direction of the arrow III in FIG. 1.

FIG. 4 is a perspective view of the end of the rod member according to the first embodiment of the present invention as viewed from obliquely above.

FIG. 5 is a perspective view of an end of the rod member according to the first embodiment of the present invention as viewed obliquely from below.

FIG. 6 is a perspective view of an end portion of a base material of the rod member according to the first embodiment of the present invention.

FIG. 7 is a perspective view of an upper blade and a lower blade for processing the rod member according to the first embodiment of the present invention.

FIG. 8 is a cross-sectional view of the manufacturing apparatus before shearing.

FIG. 9 is a sectional view of the manufacturing apparatus during shearing.

FIG. 10 is a front view of an end of a rod member according to a second embodiment of the present invention.

FIG. 11 is a plan view of an end of a rod member according to a second embodiment of the present invention.

FIG. 12 is a view showing a rod member according to a second embodiment of the present invention, and is a view taken in the direction of arrow XII in FIG. 10;

FIG. 13 is a perspective view of an end of a rod member according to a second embodiment of the present invention as viewed from obliquely above.

FIG. 14 is a view showing a conventional technique, and is an explanatory view of an end portion of a rod member immediately after shearing.

FIG. 15 is an explanatory view showing an end of a rod member after chamfering according to a conventional technique.

[Explanation of symbols]

 20, 20a ... rod member 21, 21a ... end 22, 22a ... taper surface 23, 23a ... sagging surface 24, 24a ... side taper surface 30 ... manufacturing device 45 ... upper blade 48 ... convex blade 48a ... main blade 48b ... Side blade 55 ... Lower blade 58 ... Concave blade part 58a ... Main blade 58b ... Side blade

Claims (3)

(57) [Claims] 1. An end structure of a rod member cut to a predetermined size from a base material by shearing processing, wherein the rod member is formed in a cutting direction by a main blade provided on an upper blade and abutting so as to shear the rod member. Tapered surface,
When the lower blade bites into the back surface, a sag surface formed on the back side forms a relief that is smaller than the outer diameter of the rod member above and below the end of the rod member. The side blade with the concave blade portion corresponding to the convex blade portion formed in the above forms a side taper surface at the time of shearing on both sides of the end of the rod member to form a side relief, and the outer periphery of the end is An end structure of a rod member, wherein the end structure is smaller than the outer diameter. 2. A method for manufacturing a rod member cut to a predetermined size from a base material by shearing, wherein the rod member is formed in a cutting direction by a main blade provided on an upper blade and abutting so as to shear the rod member. A tapered surface,
When the lower blade bites into the back surface, a sag surface formed on the back side forms a relief that is smaller than the outer diameter of the upper and lower ends of the rod member, and a convex blade portion formed on the upper blade and extending in the cutting direction; The side blade with the concave blade portion corresponding to the convex blade portion formed in the above forms a side taper surface at the time of shearing on both sides of the end of the rod member to form a side relief, and the outer periphery of the end is A method for manufacturing a rod member, wherein the outer diameter is smaller than the outer diameter. 3. An apparatus for manufacturing a rod member which cuts off from a base material to a predetermined size by shearing and forms a clearance smaller than its outer diameter above and below an end of the rod member, wherein a tapered surface is formed in a cutting direction. An upper blade having a main blade abutting to shear the rod member to form, a lower blade forming a sagging surface on the back side when biting, and forming a side taper surface on both sides of the end of the rod member when shearing. A convex blade portion formed on the upper blade and extending in the cutting direction and a side blade of a concave blade portion corresponding to the convex blade portion formed on the lower blade are provided so as to form an escape of the side portion. An apparatus for manufacturing a rod member, wherein the outer diameter is smaller than the outer diameter.