JPH03161114A - Extrusion press apparatus - Google Patents

Abstract

PURPOSE:To reduce an idle time by providing a position detecting device to a ram and stopping the ram on the way of a stroke having a minimum gap necessary to insert a billet for the next cylinder into a container when the ram is moved back. CONSTITUTION:When the ram 58 is moved back, the positions of the ram 58 are detected continuously by the position detecting device 90 and the ram 58 ad the ram 58 is moved back as far as the midst of the stroke and stopper so that a minimum gap necessary to insert the billet of a length necessary for extrusion in the next cycle into the container 38 is formed between the container 38 and the tip of a stem 60. Consequently, the stroke time necessary to move the ram back and forth is reduced and the idle time, also, is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an extrusion press apparatus, and particularly to an extrusion press apparatus designed to shorten idle time between pressing steps. When performing extrusion press using an extrusion press device, the billet on the billet loader is loaded into the container with the stem at the tip of the ram, with the container pressed against the die. (In this case, a fixed dummy block is attached to the stem, but a dummy block is sometimes interposed between the stem and the billet.) Then, the ram is further advanced and the stem strongly presses the billet, and the billet is released from the die into a specified position. Extrude the billet as an extruded product. After extruding the billet, the container is slightly retracted by the container cylinder, and the main ram is retracted from the position where the discard is removed from the container. Next, a cut is made between the container and the die. The cutting blade of the device is sent in to separate the remaining billet (referred to as a discard) in front of the die 24. After that, the ram is moved backward to remove the stem from the container, and the next two billets are inserted into the container. The conventional device had the following problems: When retracting the ram after billet extrusion, the ram was retracted to the retraction limit. ．For this reason, the stem was retracted more than necessary, requiring a long time to stroke the stem, and the idle time between pressing processes became unnecessarily long. [Means for solving the problem] The present invention provides an extrusion press device in which an end platen, a die, a container, and a pressing device having a ram having a stem at its tip for pressing the billet in the container are arranged in this order from the downstream side in the extrusion direction. The ram position detection device is provided, and when the ram of the pressing device is retracted, the ram can be stopped in the middle of a stroke with a minimum gap necessary for inserting the billet of the next cycle into the container. [Operation] The piston rond of the container cylinder is stopped mid-stroke so that the minimum gap necessary for the cutting blade of the cutting device to enter is formed between the die and the container.For this reason, The stroke time of the container cylinder (the time required to move the container) is shortened. [Example] The following is a first explanation of the structure of the extrusion press device according to the example.
．． This will be explained using Figure 2. Figure 1 is a plan view of the main parts of the extrusion press device, and Figure 2 is a sectional view taken along the extrusion direction. Reference numeral 10 designates a machine base, on one end of which an end platen 12 is fixed, and on the other end a cylinder mounting block 14 is installed, and on the cylinder mounting block 14 an extrusion cylinder 16 is fixed. The lower part of the end platen 12 on the side facing the extrusion cylinder 16 protrudes and serves as a die support part 20.
A guide slide 22 is installed on the die support section 20 so as to be slidable in the width direction of the machine. A die 24 is held on this guide slide 22. The die slide 22 is moved in the machine width direction by a cylinder 25 provided on the side of the end platen 12.
Then, the rear side of the end platen l2 (extrusion cylinder 16
It is possible to reciprocate between the extrusion operation position located on the side surface) and the die exchange position where the die is pulled out from the back surface of the end platen l2. A bracket 26 is fixed to the upper part of the end platen l2 on the side facing the extrusion cylinder 16, and a cutting device 28 is provided on the bracket 26. The cutting device 2
Reference numeral 8 is for cutting the discard of the die 24 to be described later and the product part, and is provided with a cutting blade 32 that is stroked in the vertical direction by a cylinder 30. The end platen l2 and the cylinder mounting block 14 are connected by a column 34. A container guide (not shown) is provided in a portion of the column 34 on the end platen 12 side, and a container 38 is installed so as to be movable in the extrusion direction along the container guide. A container cylinder (container moving cylinder) 40 is provided on the end platen 12 to move the container 38 in the extrusion direction or in the opposite direction. The tip of the piston rod 42 of the container cylinder 40 is connected to the container holder 38A, and the container cylinder 4
By moving the piston rod 42 of 0 forward and backward, the container holder 38A can be moved in the left-right direction in FIG. 1.2. In addition, the container holder 38A
The container 38 installed in the container 38 has a billet loading hole 44, and a container sleeve 46 is installed in the billet loading hole 44. A billet loader 52 is provided on the extrusion cylinder l6 side of the container 38. The billet loader 52 can be evacuated from the stem advancing/retracting castle by a drive device (not shown). The extrusion cylinder 16 is equipped with a ram 58, and a stem 60 is attached to the tip of the ram 58 via a head plate 56 and a mounting member 54. cylinder l6
An oil reservoir tank 62 is provided on the upper side, and a prefill valve 66 connects the oil reservoir tank 62 to a hydraulic oil inlet 64 at the rear end of the cylinder l6. A damper 68 is installed in this prefill valve 66. A valve 70 for opening and closing the introduction port 64 is installed at the introduction port 64. This valve 70 is opened and closed by a cylinder 72. A side cylinder 76 is provided on the side of the extrusion cylinder 16. 78 are provided,
These piston rods 80 and 82 are fixed to the head plate 56. This head plate 56 and the container holder 38
A position detection device 90 such as a linear scale is connected to A for detecting their positions. Note that the cylinders 16, 25, 28, 40, 76 .
A hydraulic pressure supply tube (not shown in Figures 1 and 2) is connected to 78. FIG. 3 is a hydraulic piping system diagram of the extrusion press device, from the main pump 84, 86 (in case of two pumps) to the container cylinder 40, side cylinder 76, . Hydraulic pressure is supplied to the extrusion cylinder 78 and the extrusion cylinder 16, etc. Reference numeral vl-V13 in FIG. 3 indicates a valve.

The operating method of the extrusion press device configured in this way will be explained next. To perform extrusion from the state shown in Figure 1.2, first, during extrusion in the previous cycle, the billet 96 for the next cycle (
(for which the length measurement has been completed) is received by the billet loader 52 and partially lifted to the position where it is desired to interfere with the container 3B and the main ram 58. Next, the billet loader 52 is raised to the center of the press. and the ram 58 of the extrusion cylinder 16
is advanced to advance the stem 60 and load the billet 96 into the billet loading hole 44 of the container 38. When the ram 58 moves forward, the valve 70 is opened, and the ram 58 moves toward the side cylinders 76 . It is advanced by 78. As the ram 58 moves forward, a large amount of hydraulic oil flows from the oil reservoir tank 62 into the extrusion cylinder 16 via the prefill valve 66. Next, the billet loader 52 is moved to the container 38.
and the extrusion cylinder 16. Note that the container 38 is moved in advance by the container cylinder 40 so as to come into close contact with the dice 24. After the loading of the billet 96 is completed in this way, the ram 58 is further advanced and the billet 96 is strongly pressed so that the die 2
Push out from 4. During this forceful advance of the ram 58, the valve 70 is closed and the valve V12 is opened instead, supplying hydraulic pressure into the extrusion cylinder 16. After extruding the billet 96, the container cylinder 40
is activated to move the container 38 away from the dice 24. The ram 58 is moved back from the position where the discard is removed from the container 38. Next, the cylinder 30 of the cutting device 28 is activated and the cutting blade 32 is lowered to cut the product and the discard. After cutting is completed, the cutting blade 32 is moved back to the standby state shown in FIG. 2 by the cylinder 30. Thereafter, the ram 58 is retreated to a predetermined standby position, the container 38 is brought into close contact with the die 24, and the next extrusion press step is started. Note that the ram 58 is moved back by the side cylinders 76, 78. The ram 58 is connected to the side cylinder 76 . 78, the valves V9 and VlO are first opened to release the remaining extrusion pressure, and then the hydraulic oil in the extrusion cylinder 16 is returned to the oil reservoir tank 62 from the prefill valve 66 exclusively for oil discharge. In this example, the ram 5
When moving the ram 58 backward, the position detection device 90 detects the ram 58.
The position of the stem 60 is continuously detected, and a minimum gap is formed between the container 38 and the tip of the stem 60 to insert a billet of the length required for extrusion in the next cycle into the container 38. As shown, the ram 58 is stopped when it is retracted halfway. Therefore, the stroke time required for the ram 58 to move backward and forward is short. For this reason, the idle time in the device of this embodiment is extremely short. [Effects of the Invention] As is clear from the above examples, according to the apparatus of the present invention, the moving distance of the ram is shortened, and the idle time between extrusion press steps is significantly shortened. As a result, the operating efficiency of the extrusion press equipment is improved.

[Brief explanation of the drawing]

Figure 1 is a plan view of the example device, Figure 2 is a longitudinal sectional view, and Figure 3 is a longitudinal sectional view.
The figure is a hydraulic system diagram.

Claims (1)

[Claims] In the extrusion press device, an end platen, a die, a container, and a pressing device having a ram having a stem at its tip for pressing the billet in the container are arranged in this order from the downstream side in the extrusion direction. An extrusion press characterized in that it is provided with a ram position detection device and is capable of stopping in the middle of a stroke with a minimum gap necessary for inserting the billet of the next cycle into a container when the ram of the pressing device retreats. Device.