JPH07110446B2 - Sizing stopper device for billet shears - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention prevents scratches on the end of a billet when shearing a long material to a constant size continuously with a billet shear.
The present invention also relates to a sizing stopper device in a billet shear for accurately shearing or discharging the end portion of a material.

[Conventional technology]

When a material is fed into the billet shear by the material feeding mechanism arranged in the previous process of the billet shear, a stopper is arranged at the front position on the material feeding line so that this material feeding has a predetermined length. . The sizing stopper is designed to move forward and backward so that it can be adjusted according to the length of the billet to be sheared.

[Problems to be Solved by the Invention]

In order to accurately shear the billet to a specified length, the tip of the material is brought into contact with the sizing stopper and the material is pressed against the stopper with the required pressing force by the feeding mechanism, that is, the material is restrained. It is necessary to lower the upper blade with and shear between the upper and lower blades. When this material is sheared in a restrained state, an excessive frictional force is often generated on the front end surface of the material and the front end surface of the material, and the shearing surface on the billet side and the material side in shearing, and the shearing surface is often scratched.
Since the scratches on the sheared surface also affect the forged product, the scratches are machined after shearing. This finishing process requires time and labor, and also affects the sizing stoppers, etc., which significantly impairs the service life.

In addition, when it reaches the end, it is a predetermined length when it is sheared to a certain size one by one, and when the length is less than half the length of the material plus the sizing, the billet at the end of the material cannot be cut accurately. In addition, since it causes damage to the cutting tool, it is necessary to stop shearing and feed out the material end portion. In the past, since a fixed-sizing stopper was rotated by rotating the adjusting screw rod, it took a considerable time to retract the stopper and move it forward again and stop at a fixed position, and the material supply was stopped while the stopper was moving forward and backward. As a result, the production efficiency is lowered.

The present invention provides a billet capable of instantaneously performing forward / backward movements at different shearing distances and without rotating the adjusting screw rod during continuous shearing and discharging of the material end portion. It is an object to provide a sizing stopper device in a shear.

[Means for Solving the Problems]

In order to achieve the above object, the present invention is a sizing stopper device in a billet shear having an upper blade and a lower blade on a fixed side, and two movably arranged along a guide frame provided in a main body frame. Of the moving frame is connected by a screw rod so that the distance between the moving frames can be adjusted, and one moving frame is connected to a bracket protruding from the body frame through a cylinder, and a cam provided on the cylinder and the bracket. With the mechanism, the movable frame can be arranged at a fixed position with respect to the main body frame and at an arbitrary position rearward from the fixed position, and a stopper attachment for sizing the billet is arranged on the other moving frame. Use as a summary.

〔Example〕

A billet shear sizing stopper device according to the present invention will be described below with reference to an embodiment shown in the drawings.

FIG. 1 shows a cross-sectional plan view of a sizing stopper device provided on a billet shear. In the figure, a bracket 2,2 is provided on a body frame 1 of a billet shear (all shapes are not shown), and a guide frame is provided at the tip of the bracket 2,2 so as to be parallel to the material feeding line. 3 is fixed, guides 4, 4 are provided above and below the guide frame 3, and the guide frames 3 and 4 are slidable to support the movable frames 5, 6. The moving frames 5 and 6 are opposed to each other and can be moved toward and away from each other via a screw rod 7 so as to move in synchronization. A worm wheel 8 is rotatably supported by a bearing B on one of the moving frames 5, the screw rod 7 is screwed through the worm wheel 8, and the worm 9 meshing with the worm wheel 8 is moved. It is supported by the frame 5. Further, a motor 10 is provided outside the moving frame 5, and the motor 10
The worm shaft 11 to which the worm 9 is fixed is selectively rotated in the forward / reverse direction, and the rod 12 of the hydraulic cylinder 12 for movement supported by the bracket 2 is attached to the moving frame 5.
Lock the a and move the hydraulic cylinder 12 to move the frame 5
Is supported by the guide frame 3 and the guides 4, 4 so as to move. The rear end portion 5a of the moving frame 5 has a cylindrical shape and projects, and the bracket 2 faces the rear end portion 5a.
A cam mechanism 13 supported by the above is provided. This cam mechanism 13
As shown in the left end of FIG. 1 and FIG. 4, a plurality of, in the illustrated embodiment, six cams 14, 14, ... The cam shafts 15 arranged in a broken line annular shape and projecting from the cams 14 penetrate through the end portions of the cam mechanism housing portions 2a of the brackets, and the pinion 16 is fixed to the end portions of the respective cam shafts 15 to form a cam mechanism. The internal gear 17 arranged outside the housing portion 2a is meshed with the pinions 16, 16 ... And a lever 18 is provided on a part of the internal gear 17 so as to project from the air cylinder 19 supported by the bracket 2. The rod 19a and the lever 18 are engaged with each other, and the internal gear 17 is selectively rotated forward and backward only by an angle set by the operation of the air cylinder 19, whereby all the pinions 16 meshed with the internal gear 17 are rotated. Synchronize and rotate a predetermined angle.

The cam 14 has a circular shape in which the inner side surface is hollowed out.When the hollowed-out portion 14a is located on the inner peripheral side and the projecting portion 14b is located on the outer peripheral side, the tip of the projecting portion 14b contacts the frame rear end portion 5a. When the cut-out portion 14a is on the outer peripheral side and the projecting portion 14b is on the inner peripheral side, the frame rear end portion 5a is the cut-out portion of the cam.
It is designed to be inserted into 14a. The depth of the cut-out portion 14a of the cam 14 is determined so that the stopper device has the maximum retreat distance allowed. The other moving frame 6
Is equipped with a stopper attachment 23, and this stopper attachment 23 is connected to the moving frame 6 by a connecting rod.
It is fixed to 24 and the connecting rod 24 is engaged with the tip of the screw rod 7 so as to be freely rotatable, so that the connecting rod 24 and the stopper attachment 23 do not rotate even if the screw rod 7 rotates. ing. The screw rod 7, the connecting rod 24, and the stopper attachment 23 are arranged in a straight line and coaxially with the feed line of the material, and the upper blade 20 and the lower blade of the billet shear are arranged on the line.
21 is set up and down, and the feeding mechanism 22 is further arranged outside thereof.

When using a billet shear configured as described above to shear a material of a required diameter (round bar) to a predetermined size, the distance between the tip position of the upper blade 20 and lower blade 21 of the billet shear and the stopper attachment 23 Adjust to the specified dimensions. This drives the motor 10 to rotate the screw rod 7 screwed onto the worm 9 and the worm wheel 8, and the stopper attachment supported by the moving frame 6 locked at the tip of the screw rod 7. 23 is advanced or retracted so that the distance from the fixed shear position is a predetermined size. The moving frame 5 equipped with the screw rod 7 is driven by the motor 10.
Then, the moving frame 6 having the stopper attachment 23 moves at the same time and along the guide frame 3.
At this time, all of the cams 14 are cam 14 as shown in FIG.
The projecting portion 14b and the rear end portion 5a of the moving frame are stopped at a position where they are in contact with each other. After dimensioning as described above, when a long bar, usually having a length of several meters, is fed by the feeding mechanism 22, the tip of the round bar is brought into contact with the stopper attachment 23, and the feeding is not performed. Will be stopped,
Further, when a driving force is applied to the feeding roller 22R of the feeding mechanism 22, the round bar material is restrained between the feeding roller 22R and the stopper attachment 23. When the upper blade 20 of the billet shear is lowered in this restrained state, the billet shear is sheared between the upper blade 20 and the lower blade 21 which is provided opposite thereto. In this case, when the upper blade 20 descends, the round bar material is sandwiched between the upper blade 20 and the lower blade 21, and when stress begins to concentrate at the shearing position of the round bar material, the round bar material is the upper blade,
It is restrained between the lower blades 21. At this time, the air cylinder 19
When the internal gear 17 is rotated by a set angle by operating, the pinions 16, 16 ...
When the projecting portion 14b of the moving frame 5 is rotated to the inner peripheral side position, the pressing force on the rear end portion 5a of the moving frame 5 is released. When the pressing cylinder 12 is operated in this state, the moving frame 5, the screw rod 7, and the moving frame 6 connected by the connecting rod 24 are all retracted. The amount of retreat of the moving frames 5 and 6 is determined in advance by the operation time of the hydraulic cylinder 12, and may be such that the pressing restraint force of the round bar member on the stopper attachment 23 is usually released, for example, about 2 to 3 mm. The shearing is completed by lowering the upper blade 20 with the restraint force of the round bar member to the stopper attachment 23 released. A stopper attachment is attached to the end face of the billet sheared by this.
Since the stress of 23 does not act, it can be sheared accurately without damaging the sheared surface.

After the completion of shearing, when the upper blade 20 rises, the moving frames 5 and 6 are moved forward by re-operation of the hydraulic cylinder 12 and stopped at a fixed position, and the air cylinder 19 is operated to operate the internal gear.
17 is reversed, whereby the cam 14 is reversed via the pinion 16, the protruding portion 14b of the cam 14 is positioned on the outer peripheral side, and the rear end portion 5a of the moving frame is contacted and supported to perform positioning.

In this way, the moving frames 5 and 6 are returned and the cam 14
Then, the feeding of the round bar is resumed while it is locked at. This operation is sequentially repeated to automatically and continuously shear the billet of a fixed size from the round bar.

When a sensor or other means detects that the remaining length at the end of the round bar is shorter than the sum of the fixed size and the radius of the round bar, the remaining amount of this round bar It is necessary to stop the shearing and dispense this residue. Upon receiving this detection signal, the cam 14 is activated by the action of the air cylinder 19.
Is reversed to release the pressing force at the end of the moving frame 5, and then the hydraulic cylinder 12 is operated. The operation of the hydraulic cylinder 12 at this time is performed longer than in the case of temporarily releasing the pressing restraint force of the round bar during shearing. This makes the moving frame
Both 5 and 6 retreat for a set length, for example, about 10 to 100 mm. That is, the protruding portion 14b of the cam 14 is inserted into the rear end portion 5a of the moving frame having a cylindrical shape by the set distance. When the distance between the stopper attachment 23 and the shearing position becomes larger than the remaining length of the round bar material by retracting the set distance of the moving frames 5 and 6, when the next round bar material is fed, the previous round bar material is fed. The remaining material is automatically dispensed. After that, the hydraulic cylinder 12 is operated to move the moving frames 5 and 6 forward to a fixed position and stop, and then the cam 14 is further reversed by the air cylinder 19, and the rear end of the moving frame 5 is locked and fixed. It will stop at the position.

〔The invention's effect〕

According to the present invention, when the material is sheared, when the material is constrained between the upper blade and the lower blade, the moving frame having the stopper attachment for sizing the billet is fixed from the fixed position with respect to the main body frame to an arbitrary position behind the movable frame. By moving to the position, the stress of the stopper attachment acts on the end face of the billet to be sheared temporarily so that the shearing end face of the billet is not damaged and the binding force is maintained until just before shearing. Since it can act, the shearing accuracy can be improved. Similarly, by moving the moving frame having the stopper attachment from the fixed position with respect to the main body frame to an arbitrary position behind the moving frame, the remaining material can be discharged and the next material can be sheared quickly. .

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of a billet shearing sizing stopper device of the present invention, and FIG. 2 is a partially cutaway front view of the same.
FIG. 3 is a vertical side view of the same, FIG. 4 is a side view of the cam portion,
FIG. 5 is a plan view of the whole form, and FIG. 6 is an explanatory view of the plan view of the whole form. 1 is a main body frame, 2 is a bracket, 3 is a guide frame, 5 and 6 are moving frames, 7 is a screw rod, 12 is a hydraulic cylinder, 13 is a cam mechanism, 20 is an upper blade, 21 is a lower blade, and 23.
Is a stopper attachment.

Claims (1)

[Claims] 1. A sizing stopper device for a billet shear having an upper blade (20) and a lower blade (21) on a fixed side, which is movable along a guide frame (3) provided on a main body frame (1). The two moving frames (5, 6) arranged on the main frame (5, 6) are connected by a screw rod (7) so that the distance between the two moving frames (5, 6) can be adjusted. It is connected to the bracket (2) protruding from 1) via the cylinder (12), and
The moving frame (5) can be arranged at a fixed position with respect to the main body frame (1) and at an arbitrary position behind the fixed position by a cam mechanism (13) provided on the cylinder (12) and the bracket (2). Stopper attachment (23) for sizing the billet on the other moving frame (6)
A sizing stopper device for billet shears, characterized in that