JPH073816U - Shear device for direct extrusion press - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a shearing device for a direct extrusion press, which is designed to cut a discard from a die surface without leaving cutting burrs. [Structure] One end of a shearing device that cuts and separates a discard 32 and a billet is rotatably supported by a frame of a container side of an end platen 2. Further, a pressing means that can be pressed by the shear blade 26 along the surface of the die 24 at the time of cutting the discard is arranged below the frame and the shear device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shearing device in a direct extrusion press for separating a discard (or cake) from a product extruded from a die.

[0002]

[Prior art]

 In a conventional shearing device in a direct extrusion press, a shearing guide frame is fixedly mounted on the upper side of an end platen via a bracket, and a shearing cylinder is disposed above the shearing guide frame. In the shear cylinder, a shear guide frame and a shear slide that can be vertically vertically stretched along the shear guide are fixedly provided at the tip of the piston rod of the shear cylinder. A shear blade is attached to the lower side of the central portion of the shear slide. On the other hand, a knocker is provided so as to be vertically slidable adjacent to a recessed portion having a circular cross section along the axial direction of the center of the shear blade.

[0003]

[Problems to be solved by the device]

 However, in these conventional shearing devices for a direct extrusion press, when the sheared blade is used to cut the extruded product and the residual discard of the billet, a gap between the shear page (2) blade and the end surface on the die side is 0.5. Since it was about 1 mm, the cut surface was not flush with the rear end surface of the die, resulting in cutting burr. Therefore, when the container is again moved to the die side to seal the container during the next extrusion, the cutting burr described above is caught between the container and the die, resulting in insufficient container sealing. When the billet is loaded into the container with such an insufficient container seal and the extrusion stem is advanced and pressed to eject the product from the die, burrs are generated from the gap between the die and the container ( There was a problem that it usually called "flower bloom".

In addition, after the discard cutting, when the shear blade is raised, a die presser must be provided to prevent the die from rising due to the rise of the shear blade while rubbing the end surface of the die side. There was also the problem that it would not happen. Furthermore, it has been pointed out that when the cut discards rise while being attached to the shear blade, the discards attach to the die surface.

An object of the present invention is to provide a shearing device in a direct extrusion press, which pays attention to the above-mentioned conventional problems and cleanly discards a discard without leaving a cutting burr from a die surface.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the shearing device in the direct extrusion press according to the present invention comprises a shearing blade that cuts out the discard of the extruded product and the remaining billet, and the discarding direction of the discard attached to the shearing blade. One end of the shearing device equipped with a knocker that pushes and separates from the cross direction is rotatably arranged on the frame fixed to the front end of the container of the end platen, and the shear blade is set on the die surface when cutting discard. A pressing means that can be pressed along is arranged in the lower part between the frame and the shear device.

[0007]

[Action]

 Page (3) In the shear device of the direct extrusion press according to the present invention, after the extrusion stem is moved forward to complete the extrusion, the extrusion stem is retracted and the container is also retracted so that the rear end side of the die is integrated with the product. The discard is exposed as it is. Next, the product and the discard are cut and separated by pushing down the shear blade vertically with the pressure oil introduced into the cylinder chamber as the pressing means along the die receding surface.

[0008]

【Example】

 Specific embodiments of the shearing device in the direct extrusion press according to the invention will be described in detail below with reference to the drawings.

FIG. 1 is a vertical sectional view of a shear device in a direct extrusion press according to an embodiment of the present invention, FIG. 2 is a front view of the shear device, FIG. 3 is a plan view seen from AA of FIG. 1, and FIG. FIG. 5 is a vertical sectional view showing the extruded state of the billet, and FIG. 5 is an explanatory view showing the cut state of the discard by the shear device. An end platen 2 is fixed to one end side of a machine base (not shown). The lower end of the end platen 2 facing the extrusion cylinder (not shown) protrudes to form a die support portion 28. A die slide 30 is slidably installed on the die support portion 28 in the machine width direction. There is. The die 24 is held on the die slide 30.

A shear guide frame 4 is fixedly installed on the upper side of the end platen 2 via a bracket 3 attached to a rising portion 5, and a pair of left and right shear cylinders 22 is provided on a side surface of the shear guide frame 4. Is provided. A shear slide 19 which is vertically strokeable along the shear guide frame 4 and the shear slide retainer 21 is disposed at the tip of the piston rod 22a of the shear cylinder 22, and the shear block 23 is attached to the piston rod 22a. Is installed. A shear blade 26 is attached to the lower side of the central portion of the shear block 23. The shear blade 26 cuts the discard 32 and the product 34. Page (4)

A knocker cylinder 8 is fixedly installed above the center of the shear slide 19, and a knocker rod 27 is connected to the piston rod 8a. Further, the knocker body 18 is fixed to the lower end of the knocker rod 27 so that it can slide up and down in the shear slide 19. A recess 26a having a circular cross section is cut along the axial direction of the shear slide 19 on the back surface of the shear slide 19 substantially in the center thereof.

A cylinder 36 as a pressing means is provided below the bracket 3, and a piston 36a is slidably arranged in the cylinder 36 as a pressing means. The other end of the piston rod 37 of the piston 36a is attached to the shear guide frame 4 via a flange 38 with a bolt or the like. Reference numeral 40 is a container, 42 is an extrusion system, 44 is a ram, 46 is a billet, 48 is a dummy block, 50 is a stopper, and 51 is a stopper frame.

The operation when using the shear device in the direct extrusion press configured as described above will be described. First, after the container 40 is brought into contact with the end surface of the die 24, the billet 46 is filled into the container 40, and then the extrusion stem 42 is advanced (FIG. 4), so that the product 34 is extruded from the die 24. The container 40 is retracted when the billet 46 has been extruded to the limit.

At this time, since the discard 32, which is the rest of the billet 40, is integrated with the product 34, cutting is performed by the shear blade 26. At this time, the front end surface of the disc 32 and the rear end surface of the die 24 are positioned vertically below the cutting edge of the shear blade 26, and pressure oil is introduced into the cylinder 36 to allow the shear blade 26 and the die 24 to move. The rod side of the piston 36a is pressed until the clearance on the rear end face becomes zero, that is, until the stopper 50 on the shear guide frame 4 side contacts the stopper frame 51 (FIG. 5 (1)).

Page (5) After that, by operating the shear cylinder 22 as shown by the chain line in FIG. 1, the shear blade 26 is lowered, the discard 32 is peeled from the die 24, and The product 34 is cut and separated. In this state, the knocker cylinder 8 is operated to move the knocker body 18 vertically downward to separate the discard 32 attached to the shear blade 26 (FIG. 5 (2)). After that, when pressure oil is introduced to the head side of the cylinder 36 and the piston 36a is moved to the forward limit, a gap is created between the stopper frame 51 and the stopper 50 as shown by the chain line in FIG. 26 is separated from the rear end surface of the die 24.

Next, the shear cylinder 22 and the knocker cylinder 8 are respectively actuated to retract the knocker body 18 and the shear blade 26 to their original positions, and at the same time, the pressure oil in the cylinder 36 on the head side of the piston 36a is gradually increased. When discharged, the shear blade 26 and the knocker main body 18 follow the locus as shown by the chain line in FIG. 1, and the cutting operation of the discard 32 and the product 34 is completed. When the discard 32 and the product 34 are cut, an appropriate receiving member is arranged below the card 32 so as to receive the discard 32.

[0017]

[Effect of device]

 As is clear from the above explanation, the shearing device in the direct extrusion press according to the present invention has a shear blade for cutting the extruded product and the residual Dicard of the billet, and the shearing blade attached to the shearing blade. One end of the shearing device equipped with a knocker that separates the discard by pushing it from the pushing direction and the intersecting direction is rotatably arranged on the frame fixed to the front end of the container of the end platen, and at the time of cutting the discard. By arranging the pressing means capable of pressing the shear blade along the die surface in the lower part between the frame and the shear device, the shear blade is inserted between the discard and the die without any escape, so that Since the cutting surface with the product is straight, cutting burrs do not occur on the sealing surface between the container and the die, and the sealing performance improves (6). It is possible to prevent burrs and blisters from being generated when the billet is extruded. Further, the die presser is not required, and the extrusion press device can be simplified.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a shear device in a direct extrusion press according to an embodiment of the present invention.

FIG. 2 is a front view of the shear device.

FIG. 3 is a plan view as seen from AA of FIG.

FIG. 4 is a vertical sectional view showing an extruded state of a billet.

FIG. 5 is an explanatory diagram showing a cut state of a discard by a shear device.

[Explanation of symbols]

 2 End platen 3 Bracket 4 Shear guide frame 8 Knocker cylinder 12 Support shaft 18 Knocker body 19 Shear slide 22 Shear cylinder 24 Die 26 Shear blade 30 Die slide 32 Discard 34 Product 36 Cylinder Page (7) 36a Piston 40 Container 46 Billet 50 Stopper 51 Stopper frame

Claims (1)

[Scope of utility model registration request] 1. One end of a shearing device comprising a shearing blade for cutting an extruded product and a residual discard of a billet, and a knocker for separating the discard attached to the shearing blade by pushing in the extrusion direction and the crossing direction. Is rotatably arranged on a frame fixed to the front end of the container of the end platen, and pressing means capable of pressing the shear blade along the die surface at the time of discarding is provided in the lower portion between the frame and the shear device. A shear device in a direct extrusion press, which is characterized by being arranged.