JPH03161113A - extrusion press equipment - Google Patents

Abstract

PURPOSE:To reduce the retreating time of a ram, to reduce the idle time and to improve the working rate by connecting a hydraulic oil pulling-out valve with the rear of an extruding cylinder. CONSTITUTION:Hydraulic oil pressure in the extruding cylinder is extruded by opening and closing small-sized valves V9 and V10 used exclusively for extruding pressure especially without opening and closing a prefill valve 66. Besides, since the hydraulic oil pressure can be introduced by opening a valve V12 in the same way as the valves V9 and V10, the backward and forward movement of the ram 58 can be carried out smoothly in a short time. In this way, the idle time can be reduced.

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 press steps. [Prior Art] When extrusion pressing is performed using an extrusion press device, a billet on a billet loader is loaded into the container by a stem at the tip of a ram while the container is pressed against a die. (Normally, a fixed dummy block is attached to the stem, but there are cases where a dummy block is interposed between the stem and the billet.)Then, the ram is further advanced and the billet is strongly pressed by the stem. The billet is extruded from the die as an extruded product in a predetermined shape. After pushing out the billet, the container is moved back slightly by the container cylinder, and the main ram is moved back from the position where the discard is removed from the container. Next, the cutting blade of the cutting device is sent between the container and the die to separate the remaining billet (referred to as a discard) in front of the die. After that, the ram is retracted to remove the stem from the container, the next billet is inserted into the container, and the next cycle of extrusion press operation begins. [Problems to be solved by the invention] The conventional device had the following problems. After the container contacts the die, the billet is loaded into the container by the advance of the ram, and the ram is further advanced to press the billet and push it out of the die. When the billet is compressed to the same diameter as the container), the container cylinder is operated to perform a burp operation (the movement of the billet to expel the air trapped in the container as the billet advances), and as the container retreats, the ram also retreats. When trying to do this, the ram has a long retreat distance, so it is necessary to fully open the prefill valve to return a large amount of hydraulic oil in the extrusion cylinder to the oil reservoir tank, so the prefill valve must be fully opened. As a result, the ram's retraction operation time became longer, and the idle time between press processes became unnecessarily long. [Means for Solving the Problem] In order to solve this problem, the present invention extrudes an end platen, a die, a container, and a ram having a stem at its tip for pressing the billet inside the container. In an extrusion press device, which is engaged with a cylinder and is slidably slidable back and forth, and which is arranged in this order from the downstream side in the extrusion direction, a hydraulic oil extraction valve is connected to and provided at the rear of the extrusion cylinder. I made it. [Operation] When retracting the ram with the container retracting due to barb operation, open the hydraulic oil drain valve leading to the extrusion cylinder with the prefill valve closed to draw out a small amount of hydraulic oil and move the ram a little further down the distance #I. (5-10mm) By quickly retreating, the burp operation time is shortened.

【Example】

The following is a first explanation of the structure of the extrusion press device according to the embodiment.
．． This will be explained using Figure 2. Figure 1 is a plan view of the main parts of the extrusion press equipment, and Figure 2 is a sectional view taken in the extrusion direction. Reference numeral 10 denotes a machine base, on which an end platen 12 is fixedly installed on one end side, a cylinder mounting block 14 is installed on the other end side, and an extrusion cylinder 16 is fixedly installed on the cylinder mounting block 14. The lower part of the end platen 12 on the side facing the extrusion cylinder 16 protrudes to form a die support part 20, and a guide slide 22 is installed on the die support part 20 so as to be slidable in the width direction of the machine. A die 24 is held on this guide slide 22. The guide slide 22 is moved in the machine width direction by a cylinder 25 provided on the side of the end platen l2.
Then, the rear surface of the end platen 12 (extrusion cylinder 16
It is possible to reciprocate between the extrusion operation position located on the side surface) and the die exchange position located on the back side of the end platen l2. A bracket 26 is fixed to the upper part of the end platen 12 on the side facing the extrusion cylinder l6, 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 and the product part, which will be described later, and includes a cutting blade 32 that is stroked in the vertical direction by a cylinder 30. The end platen 12 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 on the container guide so as to be movable in the extrusion direction. 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 16 side of the container 38. The billet loader 52 can be retracted from the stem advancement/retraction area by a drive device (not shown). The extrusion cylinder 16 includes 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 16
An oil reservoir tank 62 is provided on the upper side, and the oil reservoir tank 62 and a hydraulic oil inlet 64 at the rear end of the cylinder 16 are connected by a prefill valve 66. A butterfly valve 68 is installed in this prefill valve 66. A valve 70 for opening and closing the introduction port 64 is installed in 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. 7
8 are provided, and their piston ronds 80.
82 is the head play. It is fixed to the plate 56. This head plate 56 and the container holder 38
A is connected to position detection devices 90 and 92 such as linear scales for detecting their positions. Note that the cylinders 16, 25, 28, 40, 76 .
A hydraulic pressure supply pipe (not shown in Fig. 1.2) is connected to 78. FIG. 3 is a hydraulic piping system diagram of the extrusion press apparatus, in which hydraulic pressure is supplied from the main pump 84, 86 to the container cylinder 40, side cylinders 76, 78, extrusion cylinder 16, etc. Reference symbols v1 to V13 in FIG. 3 indicate valves. The operating method of the extrusion press device configured in this way will be explained below. To perform extrusion from the state shown in FIGS. 1 and 2, first, during the extrusion of the previous cycle, the billet 96 for the next cycle (for which length measurement has been completed) is received by the billet loader 52, and the billet 96 is transferred to the container 38 and the main ram. The part has been raised to the position where you want to interfere with 58. Next, the billet loader 52 is raised to the center of the press. The ram 58 of the extrusion cylinder 16 is then advanced to advance the stem 60 and the billet 96 is loaded 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 is moved forward by the side cylinders 76 and 78. As the ram 58 moves forward, a large amount of hydraulic oil flows from the oil reservoir tank 62 through the prefill valve 66 into the extrusion cylinder l6. Next, the billet loader 52 is evacuated from the position between the container 38 and the extrusion cylinder l6. Note that the container 38 is preliminarily connected to the die 2 by the container cylinder 40.
It has been moved so that it is in close contact with 4. After loading the billet 96 in this way, the ram 58 is further advanced, the container 38 and the ram 58 are temporarily retreated, the die 24 side is opened, and a burp cycle is performed.
The container 38 is moved forward again and brought into close contact with the dice 24. Next, the ram 58 is advanced to forcefully press the billet 96 and extrude it from the die 24. Upon this forceful advancement of ram 58, valve 70 is closed and valve V1 is replaced instead.
2 is opened and hydraulic pressure is supplied into the extrusion cylinder l6. After extrusion of the billet 96 is completed, the container cylinder 40 is operated to move the container 38 away from the die 24, and the main ram 58 is retreated 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
The product and discard are disconnected by lowering. After cutting, the cylinder 30 moves the cutting blade 32 to the second position.
Retract to the standby state shown in the figure. Also, after that, Ram 58
The container 38 is moved back to a predetermined standby position, and the container 38
' on dice 24! E and move on to the next extrusion press process. Note that the ram 58 is retracted by the side cylinder 78. 78. As mentioned above, in the burp cycle operation, the ram 5
8 is retracted by the side cylinders 76 and 78, the prefill valve 66 is kept closed so that the hydraulic pressure in the extrusion cylinder 16 is not returned to the oil reservoir tank 62 from the prefill valve 66 dedicated for oil discharge. In this state, first, open valve V9 to release the pressure at the time of the abset (120 to 130 Kg/cm"), and when this pressure reaches around 50 Kg/cm", valve VIO is opened under the command to open. VIO begins to open. When the pressure inside the extrusion cylinder 16 becomes almost zero, valve v8 is closed. The operation of the side cylinder 78 causes the ram 58 to move backward, and as the ram 58 moves back, the extrusion cylinder 1
The hydraulic oil in 6 is discharged from valve VIG to the tank.
Further, the partial retraction distance of the ram 58 is controlled by the position detection device 90, and the partial retraction distance of the container 38 is controlled to a minimum by the position detection device 92. Here, when the ram 58 retreats, the hydraulic oil is returned to the oil reservoir tank 62 from the retreat-only lines 100 and 102, which are separate from the hydraulic oil supply line, so the ram's retreat speed increases. The retraction distance between the ram 58 and the container 38 is the distance between the die 24, the container 38 and the billet 9 at the time of 7 presses.
The minimum size (approximately tozm) is the tentative goal, as required for evacuation of the air trapped between the three parts in Section 6. After this,
First, hydraulic pressure is supplied to the piston rod side of the container cylinder 40 to bring the container 38 into contact with the die 24 and press the container 38 toward the die 24 again so that the billet 96 can be extruded. Next, while keeping the prefill valve 66 closed, valves v9 and VIO are closed, and valves Vll and Vl2 are opened to fill the side cylinders 78 . 80 and the extrusion cylinder l6. In this way, the ram 58 starts moving forward and the billet 96 is pushed out. In this embodiment, the hydraulic pressure inside the extrusion cylinder 16 is extracted by opening and closing the small pressure relief valve v9 and VIO, without opening and closing the prefill valve 66 one by one. Like valve V8 and VIO, valve V12 can be opened to introduce hydraulic pressure, so the ram 58 can be moved back and forward smoothly in a short time. 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 embodiments, according to the device of the present invention, when the ram is retreated to perform a burp operation, the prefill valve is opened and the hydraulic oil is temporarily drained because the ram retreat distance is small. There is no need to return the oil to the oil reservoir tank, and the valve VIO, which is easy to operate and has a short opening/closing time, is used, which shortens the ram retraction time and greatly reduces the idle time for the extrusion press process. As a result, the operating efficiency of the extrusion press equipment is improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the embodiment device, Fig. 2 is a vertical sectional view, and Fig. 3 is a longitudinal sectional view.
The figure is a hydraulic system diagram. l6...Extrusion cylinder, 24...Dice, 28
... Cutting device, 32 ... Cutting blade, 38 ...
Container, 58... Ram, 60... Stem, 90.92... Position detection device.

Claims (1)

[Claims] An end platen, a die, a container, and a ram with a stem at the tip for pressing the billet inside the container are provided so as to be able to engage with the extrusion cylinder and slide back and forth, and are arranged in this order from the downstream side in the extrusion direction. An extrusion press apparatus according to the present invention, characterized in that a hydraulic oil extraction valve is connected to and provided at the rear of the extrusion cylinder.