JPH0711850Y2 - Billet shearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a billet shearing device.

(Prior Art) As shown in Japanese Patent Publication No. 52-6796, a conventional sizing cutter of this type has a ram for restraining a long object to be cut by a clamp while abutting the tip of the long object to be cut on a ram. A long blade to be cut is cut to a fixed size by a movable blade that can be moved up and down by a fixed blade that cooperates with the movable blade.

(Problems to be Solved by the Invention) In the above conventional device, when the long object is cut, the stopper is fixed and does not move. Therefore, when the clearance between the movable blade and the fixed blade is not properly set, etc. In addition to the fact that the fracture surface becomes rough due to cracking, burr, deformation, etc., the stopper may be damaged by a large force acting in the axial direction of the long object.

(Means for Solving Problems) The present invention was devised in order to solve the above problems, and the gist of the present invention is to provide a frame having a ram and its up-and-down drive mechanism, and a frame. A bed that is supported so as to be horizontally movable and can be repositioned between a set position for performing shearing work and a maintenance position for performing preparatory work before shearing work, a fastening means for fastening the bed to the frame at the set position, and the bed. A cutter mechanism having a movable blade that is mounted on the bed and that is moved up and down by the ram when facing the ram when the bed is set in the setting position, and a fixed blade that cooperates with the movable blade to shear the billet. And a support that is mounted on the bed and moves in a direction orthogonal to the movable direction of the movable blade to stop at a desired position, and the same direction as the support. A force that acts on the billet in the axial direction when the billet is sheared by the front end of the billet that is movably mounted on the bed and contacts the tip surface of the billet that is sheared by being positioned behind the movable blade and that regulates the shear length of the billet. A stopper mechanism that receives the stopper and a buffer member that is provided on the support and that is connected to the stopper and that prevents the stopper from being damaged when the stopper receives a force that damages the stopper from the billet during shearing; A billet shearing device comprising:

(Operation) Since the present invention has the above-described structure, when the billet is sheared and a large force is applied to the billet in the axial direction of the billet, the stopper receives a force of a predetermined value or more.
The stopper moves rearward to be separated from the movable blade, and the force acting on the stopper equal to or more than a predetermined value is damped by the dampening member.

(Embodiment) One embodiment of the present invention is shown in FIGS. 1 to 5.

Reference numeral 1 denotes a frame of the billet shearing device, which comprises a ram 2 which can be moved up and down by an up-and-down driving mechanism (not shown). A bed 3 is supported by the frame 1, moves substantially horizontally, and is fastened to the frame 1 by fastening means 4 at a predetermined position. The bed 3 has a cutter mechanism 5
And a stopper mechanism 6 are mounted. The cutter mechanism 5 includes a fixed blade 7 and a movable blade 8. The fixed blade 7 is detachably fastened to a lower holder 9 fixed to the bed 3 with a bolt 10. The movable blade 8 is detachably fastened to the upper holder 11 with bolts 12. The upper holder 11 is vertically movably engaged with the lower holder 9 and is urged upward by a pair of springs 13 so that the top surface of the head portion 11a thereof contacts the lower surface of the ram 2.

The stopper mechanism 6 is a stopper that contacts the tip of the billet B.
The stopper 14 is fitted and fixed to the tip of the slide block 15. Pins 16 extending horizontally on a pair of yokes 15a protruding behind the slide block 15
The tip of the first link 17 is pivotally attached via
The rear end of 17 is pivotally attached to the tips of a pair of second links 19 via a horizontally extending pin 18, and the rear end of this second link 19 projects from the clevis 21 via a horizontally extending pin 20. It is pivotally attached to the tip of the bracket 21a. The clevis 21 is fixed to a support 22, and the support 22 is rotatably supported by a rail guide 23 sliding on the bed 3 via a horizontally extending pin 24. And this support
An air cylinder 26 is rotatably attached to 22 via a horizontal shaft 25, and a piston rod 26a of the air cylinder 26 is attached to the air cylinder 26.
A yoke 27 attached to the lower end of the is pivotally supported on the pin 18. The first link 17 and the second link 19 are adapted to be bent at a slight angle around the pin 18 as shown. The tip of the adjusting bolt 28 is rotatably locked behind the clevis 21, and the lock nut 29 screwed to the adjusting bolt 28 is fastened to the horizontal beam 41 mounted on the rail guide 23 by the bolt 30. . By rotating the handle 31 fixed to the rear end of the adjusting bolt 28, the stopper mechanism 6 moves back and forth. The stopper 14 is provided with a dog 33 which is pushed by a spring 32 and constantly projects from the tip end surface of the stopper 14, and the dog 33 is connected to a proximity switch 34. Reference numeral 35 is a roller attached to the bed 3, which is pushed by the spring 36 and advances below the bed 3 to lift the bed 3 onto the base 1a of the frame 1. The fastening means 4 comprises a clamp bolt 37.
The lower end of 37 is pivotally supported on the base 1a by a pin 38.
Then, the clamp bolt 37 is rotated around the pin 38 to fit into the notch 39 provided in the base 1a and the bed 3, and the nut 40 is screwed into the head thereof to frame the bed 3 in the frame. Can be fastened to 1.

When the billet shearing device is in operation, the members occupy the positions shown in the drawing, the bed 3 is fastened to the frame 1 by the fastening means 4, and the upper holder 11 of the cutter mechanism 5 is lifted by the spring 13 to raise its head 11a. The apex of the ram is in contact with the lower surface of the ram 2. The billet B is supplied onto the lower holder 9 and moved forward to the right, passes between the fixed blade 7 and the movable blade 8, and its front end abuts on the tip surface of the stopper 14. Then, the dog 33 retreats against the spring 32, and the fact is transmitted to the proximity switch 34. Proximity switch
A vertical drive mechanism is activated by a signal from 34 to lower the ram 2. Along with this, the upper holder 11 and the movable blade 8 fastened thereto are lowered to shear the billet B by the movable blade 8 and the fixed blade 7. And during this shearing process,
Since the front end of the billet 8 is in contact with and constrained by the front end surface of the stopper 14, the cutting length is kept constant, and the escape of the cutting blade is prevented, so that the precision of the shearing surface is improved. Also, when the billet B is sheared, a large force acts on the billet B along its axial direction because the clearance between the fixed blade 7 and the movable blade 8 is not properly set. When a force is applied to 14 to the right and more than a predetermined value, the first link 17 and the second link 19 are pinned.
19 pivots around pins 16, 18 and 20 to move the first link 17
Then, the second link 19 bends around the pin 18 and the pin 18 moves diagonally upward to the right. Along with this, the stopper 14 moves to the right and separates from the movable blade 8. The upward movement of the pin 18 is damped by the air cylinder 26.

By appropriately selecting the diameter and pressure of the air cylinder 26, the force at which the pin 18 starts to move upward can be set arbitrarily. Therefore, in the normal state, the stopper 14 stands still at a predetermined position and the cutting length of the billet B is cut. Is kept constant.

When the sectional shape and size of the billet B are changed, the nut 40 screwed into the clamp bolt 37 of the fastening means 4 is used.
Is screwed back, and the clamp bolt 37 is rotated around the pin 38 to be separated from the notch 39. Then, the fastening state between the bed 3 and the frame 1 is released, and the roller 35 causes the spring 36 to move.
It is pushed by and advances below the bed 3,
Is lifted on the base 1a. In this state, when the hydraulic pressure or air cylinder (not shown) is operated or the bed 3 is moved to the right by human power, the cutter mechanism 5 mounted on the bed 3 is moved.
Is pulled out from inside the frame 1 and exposed to the outside,
In this state, the fixed blade 7 and the movable blade 8 are exchanged, and the clearance between them is adjusted. When the cutting length of the billet B is changed, the handle 31 is rotated to rotate the adjustment bolt 28, the clevis 21, the bracket 21a, the pin 20, the second link 19, the pin 18, the first link 17, the pin. The stopper 14 is moved forward and backward through the 16, yoke 15a, and slide block 15 to adjust the distance between the tip surface of the stopper 14 and the fixed blade 7.

When these adjustments are completed, the bed 3 is moved to the left and the cutter mechanism 5 is housed in the frame 1. Then, when the top of the head 11a of the upper holder 11 abuts on the lower surface of the ram 2 and the bed 3 and the frame 1 occupy a predetermined relative position, the clamp bolt 37 is rotated around the pin 38 to make a notch. The bed 3 and the frame 1 are fastened by fitting in the 39 and screwing the nut 40. Billet B
When the cross-sectional shape and the size and / or the cutting length thereof are changed, the fastening mechanism 4 is released and the bed 3 is horizontally moved to pull out the cutter mechanism 5 and the stopper mechanism 6 from the frame 1 to the outside. You can

Therefore, the fixed blade 7 and the movable blade 8 of the cutter mechanism 5 can be replaced and the clearance adjustment work or the stopper mechanism 6 adjustment work can be performed in a large work space outside the frame 1, so that these works are facilitated. Also quick,
And it can be done accurately. Further, when these adjustment operations are completed, the bed 3 and the frame 1 are fastened by the fastening means 4, and the upper holder 11 comes into contact with the ram 2. Therefore, the ram 2 is vertically moved by the vertical drive mechanism incorporated in the frame 1. The upper holder 11 moves up and down by moving the movable blade 8 and the lower holder 9 fastened to the upper holder 11.
The billet B can be sheared by the fixed blade 7 fastened to.

Further, due to the reason that the clearance between the fixed blade 7 and the movable blade 8 is not properly set, a great force acts along the axial direction of the billet B when it is sheared.
Even if the stopper 14 is loaded with a force greater than a predetermined value, the first link 17 and the second link 17
Since 19 bends around the pin 18 to separate the stopper 14 from the movable blade 8 and this force can be buffered by the air cylinder 26, damage to the stopper 14 can be prevented.

If the force acting on the stopper 14 is less than or equal to a predetermined value, the bending of the first and second links 17 and 18 will not occur.
Since it is restrained by 26, the billet B can be sheared to a predetermined length.

(Effect of the Invention) In the present invention, when the cross-sectional shape of the billet and its size and / or cutting length are changed, the fastening means is released, and then the bed is moved horizontally to change the position to the maintenance position. By doing so, the cutter mechanism and the stopper mechanism can be pulled out from the inside of the frame.

Therefore, the fixed blade and the movable blade of the cutter mechanism can be exchanged, and the clearance adjustment work or the stopper mechanism adjustment work can be performed in a large work space outside the frame. , Can be done accurately.

When the adjustment work is completed, the bed is pushed into the set position in the frame and the bed is fastened to the frame by the fastening means, and the movable blade faces the ram. Therefore, the vertical drive mechanism moves the ram up and down. The movable blade moves up and down and can cooperate with the fixed blade to shear the billet.

When the stopper receives a force that destroys the billet during shearing, the buffer member allows the stopper to separate from the movable blade and buffers this force, so that the clearance between the fixed blade and the movable blade is reduced. Even if a large force acting in the axial direction when the billet is sheared is applied to the stopper due to the reason that it is not properly set, it is possible to prevent the stopper and the like from being broken.

[Brief description of drawings]

1 is a side view, FIG. 2 is a side view taken along the arrow II of FIG. 1, and FIG. 3 is a first view of the first embodiment of the present invention. 4 is a plan view taken along the arrow III in FIG.
The figure is a side view taken along the arrow IV in FIG. 1, and FIG. 5 is the V- line in FIG.
It is sectional drawing which follows the V line. Frame …… 1, ram …… 2, bed …… 3, fastening means …… 4, cutter mechanism …… 5, upper holder …… 11, movable blade …… 8, lower holder …… 9, fixed blade …… 7 , Stopper mechanism …… 6

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Showa 48-30887 (JP, U) Showa 55-179725 (JP, U) JP 52-6796 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. A frame having a ram and a vertical drive mechanism for the ram, and a bed which is supported by the frame so as to be horizontally movable and can be repositioned between a set position for shearing work and a maintenance position for preparatory work before shearing work. Fastening means for fastening the bed to the frame in the set position, and a movable blade mounted on the bed and facing the ram and vertically moved by the ram when the bed is set in the set position, A cutter mechanism having a fixed blade that cooperates with the movable blade to shear the billet, a support that is mounted on the bed, moves in a direction orthogonal to the movable direction of the movable blade, and stops at a desired position, Mounted on the bed so that it can move in the same direction as the support, the front end is located behind the movable blade and abuts against the tip surface of the billet that is sheared A stopper that regulates the shear length of the billet and receives a force that acts in the axial direction when the billet is sheared, and a force that is provided on the support and that is connected to the stopper and that causes the stopper to damage the stopper from the billet during shearing. And a stopper mechanism having a cushioning member for preventing the stopper from being damaged when receiving the billet shearing device.