JPH0518714U - Extruding press mandrel cleaning device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a cleaning device for cleaning the tip of a mandrel in a short time. [Construction] After loading the billet into the container, inserting the free dummy block and advancing the extrusion stem, the pier salum is operated to insert the billet and fix the mandrel in that state. After repeating the extrusion of the pipe from the die, a cleaning device having a belt stretched in an inverted triangular shape is positioned on the tip portion of the mandrel so as to be capable of polishing, and polishing is performed. Since the belt and the tip portion are in surface contact with each other, polishing can be performed in a short time.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mandrel cleaning device for an extrusion press.

[0002]

[Prior Art]

 When an extruded product is obtained by an indirect extrusion press, first, the extrusion stem is largely retracted in the direction opposite to the extrusion direction, and the container is also retracted so that the end of the container in the extrusion direction is located at the extrusion position. Keep a little away from the dice. Then, the billet loader is activated to carry the billet and dummy block between the stem and the container, and then the container is activated to load the billet and dummy block into the container and advance the extrusion stem. The billet against the die surface. At this time, the container is also operated in the same manner so that the end of the container on the extrusion direction side is positioned at the die part.

When the billet comes into contact with 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 shearing device cuts the discard and the product, and the series of extrusion cycles is completed. Such push-out operation is detected by a detector (not shown) and is sequentially counted by the preset counter. When the number of push-outs 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 axial center of the mandrel. It was pressed against the tip of the tip to polish and clean the tip.

[0004]

[Problems to be solved by the device]

 However, when the grinder is pressed against the tip part of the mandrel tip for polishing and cleaning, since the grinder has a spherical shape, the surface part of the grinder and the above-mentioned tip part come into contact with each other and are polished. It For this reason, it takes time to clean, and if the tip part is used repeatedly, the contact surface between the grinder and the tip part changes from line contact to point contact, and the polishing time becomes longer and longer. There was a drawback.

[0005]

[Means for Solving the Problems]

 In order to solve such a problem, in the present invention, after the extrusion is completed, the die is placed at the center of the extrusion press and is disposed adjacent to the main ram side of the die unloader that receives the die and the free dummy block. A belt coated with an abrasive is stretched in a polygonal shape at one end of the connecting rod arranged so as to be tiltable so as to be rotatable.

[0006]

[Action]

 First, the container is kept in contact with the die, and then the billet is loaded into the container. Insert the free dummy block, move the extrusion stem forward, and when the tip of the extrusion system comes into contact with the free dummy block, activate the pier salam, move the mandrel forward, insert the billet, and put the mandrel in that state. Fix it. Then, the main ram is advanced to advance the extrusion stem and press the billet, so that the product tube can be extruded from the die. After this, when the number of extrusions reaches the preset number, the cleaning control circuit operates, rotating the mandrel around the shaft center and rotating the belt by the drive device. Cleaning is performed by introducing pressure oil into the cylinder, tilting the connecting rod, and pressing the belt against the tip of the mandrel tip. Unlike the conventional method, the belt and the tip are in surface contact with each other and polishing can be performed in a short time.

[0007]

【Example】

 1 to 6 show an embodiment of a mandrel cleaning device for an extrusion press according to the present invention. FIG. 1 is a front view of the entire extrusion press, FIG. 2 is a front view of FIG. 1 taken along line II-II, and FIG. FIG. 4 is a perspective view of a mandrel cleaning device arranged adjacent to the die unloader, and FIGS. 4 and 5 are explanatory views showing a polishing state of the mandrel cleaning device.

In FIG. 1, reference numeral 21 is a main cylinder mounted on a fixed plate 22, 23 is a main ram slidably mounted on the main cylinder 21, and 20 is a moving frame connected to the main ram 23. 20 is slid on a guide (not shown). The main ram 23 is for moving the moving frame 20 forward, and for moving the moving frame 20 backward, the cylinder 25 is fixed to the fixed platen 22, and the piston rod 26 of the cylinder 25 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, and the piercer crosshead 27 is attached to a piercer ram 28 slidably mounted in a piercer cylinder 29. The piercer ram 28 is a ram for advancing the piercer crosshead 27. The piercer crosshead 27 is provided with a retracting cylinder (not shown).

Reference numeral 8a is a cylindrical extrusion stem attached to the tip of the moving frame 20, 5 is a mandrel slidably provided in the extrusion stem 8a, and has a tip portion 5a at the tip. The mandrel 5 is screwed to the mandrel holder 6, and the mandrel holder 6 is rotated by the worm mechanism 7 or the 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 different hydraulic mechanisms.

As shown in FIG. 1, a container holder 1 is movably mounted in a horizontal axial direction by a hydraulic cylinder 4 at a position facing a die 3c provided in contact with the end platen 2, and a container holder 1 is provided therein. The container 1a has a billet 10 housed therein. 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 exchanging device is also arranged at the position of the billet loader 9.

Further, the end platen 2 has a lower portion on the side facing the main crosshead 8 protruding, and a die slide 11 is installed on the die supporting portion 12 so as to be slidable 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. Further, it is possible to reciprocate between the extrusion operation position located on the back surface of the end platen 2 and the die replacement position pulled out from the back surface of the end platen 2.

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

The guide rail 32 and the container 1a are fixed via an arm (not shown) so that they can move integrally on the machine guide 16 while sliding in the extrusion direction as the container 1 moves forward and backward. Is becoming

The mandrel cleaning device 14 of the present invention will be described with reference to FIGS. 3 to 5. The mandrel cleaning device 14 is composed of a cylinder 35, a lever rod 37, a connecting rod 38, a mounting plate 40, a drive device 41 and the like. A pair of fixed plates 42 are erected separately on the traverse table 31L, and a rotary shaft 43 is rotatably provided on the fixed plate 42 by a support shaft 39. One end of the connecting rod 38 is fixed to the other end of the rotating shaft 43, and a mounting plate 40 having a substantially U-shaped opening and an opening 44 is fixed to 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 rotating wheel 45c is arranged at the tip of the motor shaft 41a. Further, a support shaft 39a is fixedly mounted on the left side mounting plate portion 40L of the opening 44, and a rotating wheel 45a is rotatably arranged at the tip of the support shaft 39a.

On the other hand, the right side mounting plate 40R is provided with a projecting portion 46 carved in a substantially square shape, and a piece portion 47 is slidably disposed on the left and right sides thereof. A spring 48 is vertically attached between the wall of the bridge portion 47 and the protruding portion 46, and the bridge portion 47 is constantly pressed against the wall surface of the protruding portion 46 (the wall surface on the opposite side to which the spring 48 is mounted). I have to. A supporting shaft 39b is fixedly provided at a substantially central portion of the piece portion 47, and a rotating wheel 45b is rotatably arranged at a tip end portion of the supporting shaft 39b.

The above-described three rotating wheels 45a, 45b, 45c are arranged in a substantially inverted triangular shape, and a belt 50 coated with an abrasive is stretched around the three rotating wheels 45a, 45b, 45c.

Next, the operation of the mandrel cleaning device of the extrusion press will be described with reference to FIGS. 3 to 5.

First, the container 1a is advanced and brought into contact with the die 3c. 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 move the tip of the extrusion stem 8a. Contact is made via the fixed dummy block 30.

Next, the pier sarum 28 is operated to advance the mandrel 5 to insert the billet 10 and the tip portion 5a of the mandrel 5 is fixed to the center of the product extruding portion of the die 3c. Subsequently, the main ram 23 is advanced again to advance the extrusion stem 8a, and the container 1a is also advanced to press the billet 10 to extrude a tube as a product from the die 3c. After the extrusion of the billet 10 is completed, the mandrel 5 is retracted by operating the pier salum 28 first, 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, and a series of operations is completed.

Such a pushing operation is detected by a detector (not shown) and is sequentially counted by a preset counter. When the number of push-outs reaches the preset number, the cleaning control circuit operates by the output from the preset counter, the piston engaged with the cylinder (not shown) expands, and the opening of the mounting plate 40 arranged in the mandrel cleaning device 14 opens. The operation is started so that the portion 44 is located at the extrusion center of the billet 10. After the mandrel cleaning device 14 is thus positioned at the center of extrusion, the mandrel 5 is moved forward by operating the pier sarum 28, and the tip portion 5a of the mandrel 5 is positioned on the belt 50 of the mandrel cleaning device 14 so that it can be ground. ..

Subsequently, the mandrel 5 is rotated around the axis by the worm mechanism 7 by a rotation drive device (not shown), and the belt 50 is rotated by the drive 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 tilts through the connecting rod 38 in the direction of the arrow shown in FIG. 5, and the tip of the mandrel 5 tip. When pressed against the portion 5a, the spring 48 arranged in the perforated portion 46 is compressed and the bridge portion 47 approaches the opening 44 side, so that the belt 50 is stretched in the shape of a dogleg. Polishing cleaning of the tip portion 5a is performed as it is. In this case, in order to press the belt 50 against the mandrel 5, it suffices to supply pressure oil to the cylinder 35 in response to a change in the diameter of the mandrel 5 to expand / contract the rod and tilt the connecting rod 38. The contact area increases due to the inverted shape.

[0022]

[Effect of the device]

 As is clear from the above description, in the present invention, after the extrusion is completed, it is arranged adjacent to the main ram side of the Dian loader which is located at the center of the extrusion press and receives the tees and the free dummy block. Compared with the conventional mandrel cleaning work, the work time is significantly longer because the belt coated with abrasives is stretched in a polygonal shape at one end of the tiltable connection rod. The quality of the product is improved because it can be shortened to even less and uniform cleaning is possible.

[Brief description of 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 viewed from II-II.

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

FIG. 4 is an explanatory diagram 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 die 5 mandrel 5a tip part 6 mandrel holder 8a extrusion stem 9 billet loader 10 billet 13 die unloader device 14 mandrel cleaning device 16 machine guide 23 main ram 31L, 31R traverse stand 32 guide rail 35 cylinder 36 rod 37 lever lever 38 Connecting rods 39, 39a, 39b Spindle 40 Mounting plate 41 Drive device 42 Fixing plate 43 Rotating shaft 44 Opening portions 45a, 45b, 45c Rotating wheel 46 Drilling portion 47 Piece portion 48 Spring 50 Belt

Claims (1)

[Scope of utility model registration request] 1. One end of a connecting rod which is disposed adjacent to the main ram side of a die unloader that receives the die and the free dummy block at the center of the extrusion press after the extrusion is completed and is tiltable. A mandrel cleaning device for an extrusion press, wherein a belt coated with an abrasive is stretched in a polygonal shape so as to be rotatable.