JP2526251Y2 - Extrusion press mandrel cleaning device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mandrel cleaning apparatus for an extrusion press.

[0002]

2. Description of the Related Art When an extruded product is obtained by an indirect extrusion press, first, the extrusion stem is largely retracted in the anti-extrusion direction, and the container is also retracted. Keep it away from one extrusion die. Next, the billet loader is operated to carry the billet and the dummy block between the stem and the container. Then, the container is operated to load the billet and the dummy block into the container, and the extruding stem is advanced. The billet is brought into contact with the die surface. At this time, the container is operated in the same manner, and the end of the container in the extrusion direction is positioned at the die.

When the billet contacts the die surface, the container and the extrusion stem are simultaneously moved in the extrusion direction at the same speed, and the billet is extruded from the die. When the extrusion is completed, the discard and the product are cut by the shear device, and a series of extrusion cycles is completed. Such pushing operation is detected by a detector (not shown), and is sequentially counted by a preset counter. When the number of extrusions reaches the preset number, the cleaning control circuit operates by the output from the preset counter, swings the grinder arm having the grinder at the tip, and rotates the grinder around the axis so that the tip of the mandrel is rotated. The chip was pressed against the chip and the tip was polished and cleaned.

[0004]

[Problems to be Solved by the Invention] However, when the grinder is pressed against the tip of the mandrel tip to perform polishing cleaning, the grinder has a spherical shape.
The surface of the grinder and the tip are abutted and polished in line contact. For this reason, cleaning takes time, and if the tip is used repeatedly, the contact surface between the grinder and the tip shifts from line contact to point contact, and the polishing time becomes longer. There was a drawback.

[0005]

In order to solve such a problem, in the present invention, after the extrusion is completed, the main ram side of a die unloader which receives a die and a free dummy block by being positioned at the center of the extrusion press. A belt having an abrasive applied to one end of a connecting rod, which is disposed adjacent to and is tiltably disposed, is stretched in a polygonal shape and is rotatably provided.

[0006]

[Operation] First, the container is brought into contact with the die, and then the billet is loaded into the container. Insert the free dummy block and advance the extrusion stem. When the tip of the extrusion stem comes into contact with the free dummy block, operate the pier salam to advance the mandrel and insert the billet to fix the mandrel in that state. I do. Subsequently, when the main ram is advanced to advance the extrusion stem and the billet is pressed, a product tube can be extruded from the die. Thereafter, when the number of times of extrusion reaches the preset number, the cleaning control circuit operates to rotate the mandrel around the axis and rotate the belt by the driving device. Pressure oil is introduced into the cylinder, the connecting rod is tilted, and the belt is pressed against the tip of the mandrel to perform cleaning. Unlike the related art, the belt and the tip portion are in surface contact, and can be polished in a short time.

[0007]

1 to 6 show an embodiment of a mandrel cleaning apparatus for an extrusion press according to the present invention. FIG. 1 is a front view of the entire extrusion press, and FIG. 2 is a front view of FIG. 1 as viewed from II-II. , FIG. 3 is a perspective view of a mandrel cleaning device disposed adjacent to the die unloader, and FIGS. 4 and 5 are explanatory views showing a polished state of the mandrel cleaning device.

In FIG. 1, reference numeral 21 denotes a main cylinder mounted on a fixed plate 22; 23, a main ram slidably mounted on the main cylinder 21;
The moving frame 20 is slid on a guide (not shown). The main ram 23 is for moving the moving frame 20 forward, and for retreating the moving frame 20, the cylinder 25 is fixed to the fixed platen 22,
Is fixed to a part of the moving frame 20.
A piercer crosshead 27 is provided so as to be slidable in the axial direction.
It was mounted on a pier salam 28 slidably mounted therein. The piercer ram 28 is a ram for moving the piercer cross head 27 forward. A retraction cylinder (not shown) is attached to the piercer cross head 27.

Reference numeral 8a denotes a cylindrical extrusion stem attached to the tip of the moving frame 20, and reference numeral 5 denotes a mandrel slidably provided in the extrusion stem 8a, and has a tip 5a at the tip. The mandrel 5 is fastened to the mandrel holder 6 with a screw, and the mandrel holder 6 is rotated by the worm mechanism 7 or a screw between the mandrel 5 and the mandrel holder 6 is tightened. The mandrel 5 and the mandrel holder 6 are held by the main crosshead 8, and the mandrel 5 and the main crosshead 8 are reciprocated by separate hydraulic mechanisms.

As shown in FIG. 1, a container holder 1 is mounted at a position facing a die 3c provided in contact with an end platen 2 by a hydraulic cylinder 4 so as to be movable in a horizontal axis direction. With
The billet 10 is stored in the container 1a. on the other hand,
A billet loader 9 is installed at an intermediate position between the container holder 1 and the main crosshead 8, and a mandrel changing device is also arranged at the position of the billet loader 9.

The end platen 2 has a lower portion on the side facing the main crosshead 8 protruding from the die supporting portion 1.
2, a die slide 11 is slidably mounted in the machine width direction. The die 3c is held on the die slide 11. The die slide 11 is moved in the machine width direction by a cylinder (not shown) provided on the side of the end platen 2. In addition, it is possible to reciprocate between an extrusion operation position located on the back surface of the end platen 2 and a die exchange position exiting from the back surface of the end platen 2.

FIG. 2 is a front view when the container side is viewed from the extrusion stem side. On the left side of the container 1a, a die unloader device 13 and a mandrel cleaning device 14 are mounted on the traversing table 31L adjacent to the front side thereof, and on the right side, a billet loader 9 is mounted on the traversing table 31R. The guide rails 32 can be reciprocated on the guide rails 32 from the extrusion center of the billet 10 to the standby position.

The guide rail 32 and the container 1a are fixed via an arm (not shown).
With the forward / backward movement, it is possible to move while integrally sliding on the machine guide 16 in the pushing direction.

The mandrel cleaning device 14 of the present invention
This will be described with reference to FIGS. The mandrel cleaning device 14 includes a cylinder 35, a lever rod 37, a connecting rod 38, a mounting plate 40, a driving device 41, and the like. A pair of fixed plates 42 are erected on the traversing table 31L at a distance from each other.
9 and is rotatably disposed. One end of a connecting rod 38 is fixedly provided at the other end of the rotating shaft 43, and a mounting plate 40 having a substantially U-shaped opening 44 having an opening 44 is fixedly provided at the other end. A motor as a driving device 41 is mounted near the bottom of the opening 44 in a direction orthogonal to the mounting plate 40, and a turning wheel 45c is disposed at the tip of a motor shaft 41a. Also, the support shaft 39 is attached to the left mounting plate 40L of the opening 44.
a is fixedly mounted, and a turning wheel 45a is rotatably arranged at the tip of the support shaft 39a.

On the other hand, the right mounting plate 40R is provided with a projecting portion 46 engraved in a substantially square shape, and a piece portion 47 is slidably provided on the left and right sides. A spring 48 is vertically mounted between the piece 47 and the wall of the projecting portion 46 so that the piece 47 is constantly pressed against the wall surface of the projecting portion 46 (the opposite wall surface to which the spring 48 is attached). ing. A support shaft 39b is fixed substantially at the center of the piece portion 47, and a turning wheel 45b is rotatably disposed at the tip of the support shaft 39b.

The above-mentioned three rotating wheels 45a, 45b, 4
5c is arranged in a substantially inverted triangular shape, on which a belt 50 coated with an abrasive is stretched.

Next, the operation of the mandrel cleaning device of the extrusion press will be described with reference to FIGS.

First, the container 1a is advanced and the die 3c is moved.
Abut. Next, the billet 10 is placed on a billet loader (not shown), the billet loader is moved to load the cylindrical billet 10 into the container 1a, and the main ram 23 is advanced to fix the tip of the extrusion stem 8a. The contact is made via the dummy block 30.

Next, the mandrel 5 is advanced by operating the pier salam 28 and the billet 10 is inserted to fix the tip portion 5a of the mandrel 5 at the center of the product extruding portion of the die 3c. Subsequently, the main ram 23 is again advanced to advance the extrusion stem 8a, and the container 1a is also advanced to press the billet 10, thereby extruding a tube as a product from the die 3c. After the extrusion of the billet 10 is completed, the piersalum 28 is operated first to retract the mandrel 5, and then the main ram 23 is activated to retract the extrusion stem 8a. Subsequently, a container moving cylinder (not shown) is operated to separate the container 1a from the die 3c. Next, the cutting device is operated and the cutting blade is lowered to cut the product and discard to complete a series of operations.

Such a pushing operation is detected by a detector (not shown) and is sequentially counted by a preset counter. When the number of times of extrusion reaches the preset number, the cleaning control circuit operates by the output from the preset counter, the piston engaged with the cylinder (not shown) is extended, and the opening 44 of the mounting plate 40 provided in the mandrel cleaning device 14 is opened. The operation is started so as to be located at the center of extrusion of the billet 10. After the mandrel cleaning device 14 is positioned at the center of the extrusion, the mandrel 5 is advanced by operating the pier salam 28, and the tip portion 5a of the mandrel 5 is positioned on the belt 50 of the mandrel cleaning device 14 so as to be polished.

Subsequently, the mandrel 5 is rotated about the axis by the worm mechanism 7 by a rotation driving device (not shown), and the belt 50 is rotated by the driving device 41. Next, when pressure oil is supplied to the piston head side of the cylinder 35 to retract the rod 36, the mounting plate 40 is tilted via the connecting rod 38 in the direction of the arrow shown in FIG. , The spring 48 disposed in the perforated portion 46 is compressed, and the piece portion 47 approaches the opening portion 44 side, and the belt 50 remains stretched in a square shape. The polishing cleaning of the tip portion 5a is performed. In this case, the pressing of the belt 50 to the mandrel 5 is performed by changing the diameter of the mandrel 5 to the cylinder 3.
It is only necessary to supply pressure oil to 5 to extend and contract the rod to tilt the connecting rod 38, and the contact area increases as the belt 50 becomes inverted.

[0022]

[Effect of the Invention] As is apparent from the above description, in the present invention, after the extrusion is completed, the die is located at the center of the extrusion press and is adjacent to the main ram side of the die loader for receiving the die and the free dummy block. A belt coated with an abrasive at one end of a connecting rod that is arranged and tilted is stretched in a polygonal shape and is rotatably provided, so that compared to the conventional mandrel cleaning work,
The working time can be greatly reduced, and even cleaning can be performed, thereby improving product quality.

[Brief description of the drawings]

FIG. 1 is a front view of an entire extrusion press according to the present invention.

FIG. 2 is a front view of FIG. 1 as viewed from II-II.

FIG. 3 is a perspective view of a mandrel cleaning device disposed adjacent to a die unloader.

FIG. 4 is an explanatory view showing a state before polishing of the mandrel cleaning device.

FIG. 5 is an explanatory diagram showing a state during polishing of the mandrel cleaning device.

[Explanation of symbols]

 1a Container 3c Dice 5 Mandrel 5a Tip 6 Mandrel Holder 8a Extrusion Stem 9 Billet Loader 10 Billet 13 Dian Loader 14 Mandrel Cleaning 16 Machine Guide 23 Main Ram 31L, 31R Traverse 32 Guide Rail 35 Cylinder 36 Rod 37 Lever Rod 38 Connecting rods 39, 39a, 39b Support shaft 40 Mounting plate 41 Driving device 42 Fixing plate 43 Rotating shaft 44 Opening 45a, 45b, 45c Rotating wheel 46 Drilling part 47 Piece 48 Spring 50 Belt

Claims (1)

(57) [Scope of request for utility model registration] After the extrusion is completed, one end of a connecting rod which is disposed adjacent to the main ram side of a die unloader which is positioned at the center of the extrusion press and receives a die and a free dummy block and is tiltably disposed. A mandrel cleaning device for an extrusion press, wherein a belt coated with an abrasive is stretched in a polygonal shape and rotatably provided.