JP2000084728A - Shearing die assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a clearance from becoming smaller than a prescribed quantity, and to thereby prevent cutting blades of a pushing blade and a receiving blade from being contacted, abraded and damaged, by installing, on the pushing blade or the receiving blade, a clearance retaining member for retaining the clearance between the pushing blade and the receiving blade at a prescribed quantity. SOLUTION: At the time of shearing the end of a long angle steel product 31, if a pushing blade 23 is pushed down in the state where the angle steel product 31 is set obliquely on an angle cutter die assembly 12, the pushing blade 23 is pushed toward the one receiving blade 17 side and the pushing blade 23 is apt to fall obliquely, but as a projecting part 23a of the pushing blade 23 is brought into face contact with the receiving blade 17, a cutting blade 23c of the pushing blade 23 is not contacted with the receiving blade 17, and shearing is executed by utilizing the projection quantity of the projecting part 23a as a clearance. A proper clearance is always kept, and stable shearing can be executed without generation of a scoring wear or a crack. And besides, the clearance on the receiving blade 17 side does not become larger than required by a projecting part 23b, and burr generation on the shearing face can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shearing die for shearing materials such as angle steel and channel materials.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS.
Angle cutter mold 12 for shearing angle steel material 31
14 and 15, a channel cutter die 1 for shearing a thin channel material 30 such as a raceway (a bimetallic wire of a type II electrical appliance) used for electrical work.
A mold such as No. 3 was set on a shearing machine to shear the material.

In the case of the angle cutter mold 12, the receiving blade 1
The pressing blade 23 is positioned between the cutting blades 5 and 17, and the angle steel material 31 set on the receiving blades 15 and 17 is cut into the cutting blades 2 on both sides of the pressing blade 23.
Shearing is performed at 3c as shown in FIG. Channel cutter mold 1
In the case of No. 3, the pressing blade 27 is positioned on the side surface of the receiving blade 25, and the channel material 30 is inserted into the grooves 25a, 27a formed in the receiving blade 25 and the pressing blade 27, and the pressing blade 27 is pressed down, as shown in FIG. To shear. By forming the grooves 25a and 27a, inner portions 25c and 27c are formed, and the inner portions 25c and 27c are formed.
c and 27c are supported by the pressing blade 27 in a cantilever manner.

[0004] In the shearing process, a gap between the pressing blade and the receiving blade is called a clearance. If this clearance is large, burrs are likely to be generated on the shear surface of the material during shearing, and a post-process such as deburring after shearing is required, resulting in a reduction in work efficiency. Conversely, if the clearance is small, the corners of the pressing blade and the receiving blade come into point contact with each other, causing galling and cracking, thereby reducing the life of the blade.

Therefore, the appropriate clearance C for the thickness T of the material to be sheared is generally C = (0.05-0.1) T (1) For example, in an angle cutter mold 12 for shearing an angle steel material 31 having a thickness T of 5 to 6 mm,
From formula (1), the clearance C is approximately 0.3 to 0.6 mm.
About. The thickness of the pressing blade 23 is b, the receiving blade 15 and the pressing blade 23
If the appropriate clearance between the blades 17 and 17 is C1 and the appropriate clearance between the receiving blade 17 and the pressing blade 23 is C2, the receiving blades 15 and 17
Is a = b + C1 + C2.

In the channel cutter mold 13 for shearing the channel material 30 having a thickness T of 1.6 to 2 mm,
From equation (1), the clearance C3 between the receiving blade 25 and the pressing blade 27 is approximately 0.1 to 0.2 mm. Assuming that the thickness of the pressing blade 27 is g, the interval f between the receiving blade 25 and the pressing blade guide 28 is f
= G + C3.

[0007]

Conventionally, in the angle cutter mold 12, the above-mentioned proper clearances C1, C2
The clearance C1 and the clearance C2 are not necessarily equal because the pressing blade 23 is simply positioned between the interval a between the receiving blade 15 and the receiving blade 17 without considering the above. For example, the clearance C1 and the clearance C2 are C
If 1 <C2, the clearance C1 on the receiving blade 15 side is too small, so that galling wear and cracks occur on the pressing blade 23 and the receiving blade 15, and the clearance C2 on the receiving blade 17 side.
Is too large, burrs are generated on the shear surface of the angle steel material 31. Clearance C between receiving blade 15 and pressing blade 23
1 and the clearance C2 between the receiving blade 17 and the pressing blade 23 are always equalized, the above problem can be solved. However, in order to set C1 = C2, the components constituting the mold must be manufactured with higher precision. However, there were problems such as an increase in cost.

When the end of the long angle steel material 31 is to be sheared, the end of the opposite angle steel material 31 is supported by a roller or a pedestal. At this time, the angle steel material 31 bends or the angle steel material 31 is supported. Is not horizontal and is set diagonally. When the angle steel material 31 is sheared by the pressing blade 23 in this state, as shown in FIG. 13, the pressing blade 23 is tilted during the shearing, and the receiving blade 15 side against which the pressing blade 23 is pressed and the pressing blade 23 are moved. The clearance C1 decreases, and conversely, the clearance C2 between the other receiving blade 17 side and the pressing blade 23 increases, and the above-described problem occurs.

In the conventional channel cutter mold 13, the clearance C 3 is not always a predetermined amount because the pressing blade 27 is only positioned at the interval f between the receiving blade 25 and the pressing blade guide 28. That is, a gap is formed between the pressing blade 27 and the pressing blade guide 28, and the clearance C3 is reduced accordingly. If the clearance C3 is small, galling wear and cracks occur on the pressing blade 27 and the receiving blade 25. In order to eliminate the above problem, the pressing blade 27
If the clearance C3 of the receiving blade 25 is to be maintained at a predetermined amount, the parts must be manufactured with higher precision, as described above, and the cost increases.

When the end of the long channel material 30 is sheared, the end of the channel material 30 that is not supported by the channel cutter mold 13 is supported by a roller or a pedestal. At this time, the channel material 30 is bent. However, the support of the channel material 30 is not horizontal and is set diagonally. When the channel material 30 is set diagonally, it is supported in contact with the inner portions 25c and 27c. When shearing is performed in this state, a force in the direction of arrow B shown in FIG. 6 is received, so that the inner portion 27c of the push blade 27 bends toward the receiving blade 25 side with the point A shown in FIG. There is a possibility that the inner portion 27c of the pressing blade 27 may be damaged due to interference, and the life of the blade is shortened. Inner part 2 of push blade 27
In order to prevent the deflection of 7c, it is necessary to increase the rigidity by increasing the thickness of the pressing blade 27, which increases the cost.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art and to provide a long-life mold at low cost.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to provide a shearing machine which has a male mold having a blade and a female mold having a blade opposed to the male mold, and moves the male mold to shear the material. This is achieved by providing a clearance holding member for maintaining the clearance between the male blade and the female blade at a predetermined amount in the male or female blade in the die.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 is a side sectional view of the angle cutter mold, FIG. 2 is a top sectional view of the angle cutter mold, FIG. 3 is a perspective view of the angle cutter mold, FIG. 4 is a front sectional view of the channel cutter mold, and FIG. FIG. 6 is a cross-sectional top view of the channel cutter mold, FIG. 6 is a perspective view of the channel cutter mold, FIG. 7 is a perspective view of a shearing machine, and FIG. 8 is a side view of FIG.

The overall configuration of a shearing machine on which a mold is placed will be described with reference to FIGS. In FIG. 7, C
The frame 1 has a support 2 and 2 in front of the opening of the frame 1. The columns 2, 2 are rotated about 90 degrees in the front-rear direction with the shaft 2a at the lower end as a fulcrum, for exchanging a mold and inserting and removing a material such as an angle steel material, which will be described later. Usually, the columns 2 are fixed to the frame 1 by the fixing knob 4 in a vertical position.

In FIG. 8, a hydraulic cylinder 5 is provided on the upper portion of the frame 1, and a piston rod 5a provided in the hydraulic cylinder 5 slides up and down. Below the piston 5a, a table 6 on which a mold is installed is provided. A hydraulic pump unit 7 is mounted on the back of the frame 1, and the inside of the hydraulic pump unit 7 includes a hydraulic pump 8, an oil tank 9, and a motor 10 for the hydraulic pump 8. The hydraulic pump 8 is connected to the hydraulic cylinder 5 via a hydraulic hose 11. Set the switch (not shown) to O
When N is performed, the motor 10 is driven, and the piston rod 5a of the hydraulic cylinder 5 is operated by the pressure of the hydraulic oil supplied from the hydraulic pump 8 via the hydraulic hose 11. Molds such as an angle cutter mold 12 and a channel cutter mold 13 are mounted on the table 6.

Regarding the configuration of the angle cutter mold 12,
This will be described with reference to FIGS. A long groove 14a for chip discharge is provided on the base 14, and a blade holder 16 for holding a V-shaped concave receiving blade 15 and a blade holder 18 for holding a blade 17 are provided on both sides of the long groove 14a. An upper and lower movable male die 20 is provided on the base 14 by using four guide shafts 19 as guides, and the upper end of the guide shaft 19 is fixed with a washer 21 so that the male die 20 does not come out upward. Is provided with a spring 22 for urging the male mold 20 upward against the washer 21. At the lower end of the male mold 20, a V-shaped concave pressing blade 23 is provided. A portable type that can be brought into the site and has a pressure of 20 to
In the angle cutter mold 12 used in a shearing machine of about 35 tons, the pressing blade 23 is set to 90 to prevent the material from being deformed.
The V-shaped convex shape is larger than the degree (generally about 130 to 150 degrees), and the receiving blades 15 and 17 have a 90-degree V-shaped concave shape according to the shape of the angle steel material 31.

The thickness of the pressing blade 23 is b, the receiving blade 15 and the pressing blade 23
Is set to C1 (in the present embodiment, C1 =
0.4 to 0.5 mm), and the appropriate clearance between the receiving blade 17 and the pressing blade 23 is C2 (in the present embodiment, C2 = 0.4 to 0.4 mm).
0.5 mm), the distance a between the receiving blade 15 and the receiving blade 17
Is a = b + C1 + C2, and the pressing blade 23 is located within the interval a.

In FIG. 2, a projection 23a and a projection 23b serving as a clearance holding member are attached to the pressing blade 23 by a cutting blade 23c.
The projection 23a is protruded toward the receiving blade 15 side, and the projection 23b is protruded toward the receiving blade 17 side. The protrusion amount of the protrusions 23a and 23b is the clearance C
1, a projection amount e smaller than C2 (e = 0.
3 mm). The projections 23a and 23b are provided at the lower ends 23a of the projections 23a and 23b when the male die 20 is in contact with the washer 21 by the spring 22.
Reference numerals 1 and 23b1 are located within the interval a between the receiving blade 15 and the receiving blade 17.

Next, the structure of the channel cutter mold 13 will be described with reference to FIGS. A receiving blade holder 26 for holding a receiving blade 25 is provided on a base 24, and a pressing blade 27 located on a side surface of the receiving blade 25 is attached to a pressing blade guide 28 so as to be vertically movable. The push blade guide 28 is provided with a locking portion 28a so that the push blade 27 does not come out upward. The push blade 27 is urged upward between the lower end of the push blade 27 and the upper surface of the base 24 so as to abut the lock portion 28a. A spring 29 is provided. The receiving blade 25 and the pressing blade 27 are provided with grooves 25a and 27a having the same shape as the channel material 30, and the positions of the grooves 25a and 27a coincide with each other when the pressing blade 27 is locked by the locking portion 28a. .

The clearance C3 between the receiving blade 25 and the pressing blade 27
(In this embodiment, C3 = 0.2 mm), and assuming that the thickness of the pressing blade 27 is g, the interval f between the receiving blade 25 and the pressing blade guide 28 is f = g + C3.

Protrusions 25b, 25b serving as clearance holding members are provided at both ends of the receiving blade 25 so as to protrude toward the pressing blade 27 side. The protrusion amount of the protrusions 25b, 25b is smaller than the clearance C3, and The projection amount i (i = 0.15 mm in the present embodiment) is larger than the deflection amount of the inner portion 27c of the pressing blade 27.

In the above configuration, first, the angle steel 3
The shearing of No. 1 will be described. When the angle steel material 31 is set on the receiving blades 15 and 17 of the angle cutter die 12 and a switch (not shown) is operated, the motor 10 is driven, hydraulic fluid is sent from the hydraulic pump 8, and the hydraulic hose 1 serving as a flow path is provided.
1 to supply and discharge the hydraulic cylinder 5 on the upper portion of the frame 1 to lower the piston rod 5a in the hydraulic cylinder 5. The piston rod 5a pushes down the male mold 20 and the pressing blade 23, and presses the angle steel material 31 with the pressing blade 23 and the receiving blades 15 and 17, and is sheared.

When shearing the end of the long angle steel material 31,
When the pressing blade 23 is pushed down in a state where the angle steel material 31 is set obliquely to the angle cutter mold 12, the pressing blade 23 is pushed toward one of the receiving blades 15 and the pressing blade 23 tends to fall obliquely. Since the protruding portion 23a of the pressing blade 23 comes into surface contact with the receiving blade 17, the cutting blade 23c of the pressing blade 23 does not contact the receiving blade 17, and the amount of protrusion of the protruding portion 23a becomes a clearance and is sheared. Clear clearance is maintained, and stable shearing can be performed without generating galling and cracking. Further, the clearance on the receiving blade 17 side does not become unnecessarily large due to the projections 23b, and the generation of burrs on the shearing surface can be prevented. Further, since the projections 23a and 23b are provided integrally with the pressing blade 23, the manufacturing cost is hardly increased.

Next, channel material 3 such as a raceway, etc.
The shearing of 0 will be described. The channel material 30 is inserted so as to pass through the groove 27a of the pressing blade 27 of the channel cutter mold 13 and the groove 25a of the receiving blade 25, and the piston rod 5a in the hydraulic cylinder 5 is lowered similarly to the shearing of the angle steel material 31. The pressing blade 27 is pressed down, and the channel material 30 is pressed and sheared by the pressing blade 27 and the receiving blade 25.

When the pressing blade 27 is pushed down while the channel material 30 is obliquely inserted into the channel cutter mold 13, even if the pressing blade 27 is inclined to the receiving blade 25 side, the receiving blade 25
Is in surface contact with the pressing blade 27 and the projection 25
Since the protrusion amount i of b is larger than the amount of bending of the inner portion 27c of the groove 27a of the pressing blade 27 due to shearing, the pressing blade 27 and the receiving blade 2
5 can be stably sheared without being worn or the inner portion 27c of the pressing blade 27 being damaged.

In this embodiment, the angle cutter mold 12
The protrusions 23a and 23b are provided on the pressing blade 23, and the protrusion 25b is provided on the receiving blade 25 of the channel cutter die 13. Has the effect of

[0027]

According to the present invention, the clearance holding member for maintaining the clearance between the pressing blade and the receiving blade at a predetermined amount is provided on the pressing blade or the receiving blade. Can be prevented from contacting and abrasion or breakage, and a long-life mold can be provided.

Further, since the clearance holding member is formed integrally with the projections provided at both ends of the pressing blade or the receiving blade, it can be provided at a low cost with little increase in manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an angle cutter mold showing an embodiment of the present invention.

FIG. 2 is a top sectional view of FIG.

FIG. 3 is a perspective view of an angle cutter mold.

FIG. 4 is a front sectional view of a channel cutter mold.

FIG. 5 is a top sectional view of FIG. 4;

FIG. 6 is a perspective view of a channel cutter mold.

FIG. 7 is a perspective view showing a state where an angle cutter mold and a material are set.

FIG. 8 is a side view of FIG. 7;

FIG. 9 is a perspective view showing a processing example of an angle steel material.

FIG. 10 is a perspective view showing an example of processing a channel material.

FIG. 11 is a side sectional view of a conventional angle cutter mold.

FIG. 12 is a top sectional view of FIG. 11;

FIG. 13 is a front sectional view of FIG. 11 showing a state where galling has occurred on the pressing blade and the receiving blade.

FIG. 14 is a front sectional view of a conventional channel cutter mold.

FIG. 15 is a top sectional view of FIG. 14;

FIG. 16 is a front sectional view showing a state in which the pressing blade and the receiving blade are bent in FIG. 14;

[Explanation of symbols]

13: Angle cutter mold, 14: Channel cutter mold, 16, 18: Receiving blade, 23: Press blade, 23a, 23b ...
Projecting portion, 23c cutting blade, 25 receiving blade, 25a groove, 25
b ... projection part, 25c ... inner part, 27a ... groove, 27c ...
Inside part.

Claims (2)

[Claims] 1. A shearing mold having a male mold having a blade and a female mold having a blade opposed to the male mold, wherein the male mold is moved to shear a material. A shearing die, wherein a male or female blade has a clearance holding member for maintaining a clearance between the blade and a female blade at a predetermined amount. 2. The shearing die according to claim 1, wherein said clearance holding member is constituted by projections provided at both ends of a male or female blade.