JPH03146217A - Extruding press apparatus - Google Patents

Abstract

PURPOSE:To reduce personal expenses for pressing operation by detecting the maximum peak of the pressure of a pressing device and measuring the interval between a container and a die in time of the peak pressure. CONSTITUTION:An extruding press apparatus is provided with an end platen 12, a die 24, a container 38 and a ram 58 provided with a stem 60 for extruding a billet in the container 38 at the tip from the downstream side of the extruding direction. A container cylinder 40 which moves the container 38 in the attachable and detachable direction to and from the end platen 12 is provided on the end platen 12. For that purpose, the maximum peak of the pressure of the pressing device (ram) 58 is detected. The interval between the container 38 and the die 24 in time of the peak pressure is measured by a position detecting device. In this way, generation of burrs can be detected automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an extrusion press apparatus, and more particularly to an extrusion press apparatus configured to be able to detect the occurrence of paris.

[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 dummy block is interposed between the stem and the billet.) Then, the ram is further advanced, the stem strongly presses the billet, and the billet is extruded from the die as an extruded product in a predetermined shape. After the extrusion is completed, the container is moved back slightly by the container cylinder, the extruded remaining billet (referred to as a day skirt) is discharged from the container, and the cutting blade of the cutting device is sent between the container and the die to cut the end face of the die. Separate the product from the day skirt.

Thereafter, the ram is retracted to remove the stem from the container, and the next billet is inserted into the container, ready for the next cycle of extrusion press operation.

[Problems to be Solved by the Invention] If a gap exists between the end face of the container and the end face of the die, cracks will occur. Previously, workers checked for the occurrence of cracks through visual observation, which not only increased the labor costs required to operate the extrusion press, but also caused misidentification, which caused problems when extruding the next billet. There was a risk that the

[Means for Solving the Problems] The present invention provides an end platen, a die, a container, and a pressing device having a ram whose tip is provided with a stem for pressing the billet inside the container in this order on the downstream side in the extrusion direction. In an extrusion press apparatus, the end platen is provided with a container cylinder that moves a container six times in a direction toward and away from the end platen, a means for detecting a maximum peak of pressure of the suppression device. , further comprising means for measuring the distance between the container and the die at the time of the peak pressure.

[When the action cost presses the billet in the container, a frictional force acts between the outer circumferential surface of the billet and the inner circumferential surface of the container, and the container itself also receives the forward pressure of the ram. In the early stage of extrusion when a large amount of billet remains in the container, the contact area between the billet and the inner peripheral surface of the container is large2, so the ram forward pressure transmitted to the container is also large.

Further, in the latter stage of extrusion when the amount of billet remaining in the container decreases, the ram forward pressure transmitted to the container decreases. Therefore, as shown in FIG. 3, the pressing force by the pressing device has a pattern in which it rapidly increases to the maximum value immediately after the start of extrusion (time 1+), and then gradually decreases until the end of extrusion (time t2).

At the peak pressure immediately after the start of extrusion, the pressure with which the container is pressed against the die also becomes maximum, and the distance d (not shown) between the container end face and the die end face becomes minimum.

In the present invention, occurrence of paris can be determined by detecting the distance d between both end faces at the time of this peak pressure. That is, when the distance d is larger than a predetermined value (for example, 0.5 mm), it is determined that a flash has occurred, and when it is greater than that, it is determined that there is no flash. Since this judgment can be made using an electric circuit, it is possible to automate the judgment of the occurrence of paris, and it is also possible to link it with an alarm device, a paris removal device, etc.

[Example] The following is a first explanation of the configuration of an extrusion press apparatus according to an example.
．． This will be explained using Figure 2.

FIG. 1 is a plan view of essential parts of an extrusion press apparatus, and FIG. 2 is a sectional view taken along the extrusion direction.

Reference numeral 10 denotes a machine base, on which an end platen 12 is fixedly installed on one end side and a cylinder mounting block 14 on the other end side.
is installed, and an extrusion cylinder 16 is fixed to 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 die 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 die slide 22.

The die slide 22 is moved six times in the machine width direction by a cylinder 25 provided on the side of the end platen 12.

Then, the rear surface of the end platen 12 (extrusion cylinder 16
It is possible to reciprocate between an extrusion operation position located on the side surface) and a die exchange position where the die is removed from the back surface of the end platen 12.

A bracket 26 is fixed to the upper part of the end platen 12 on the side facing the extrusion cylinder 16, and a cutting device 28 is provided on the bracket 26. The cutting device 2
8 is for cutting the day skirt in the container and the extruded product part, which will be described later, and cylinder 30
The cutting blade 32 is provided with a cutting blade 32 that is stroked in the vertical direction.

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 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 38, and by protruding and retracting the piston rod 42 of the container cylinder 40, the container 38 can be moved in the left-right direction in FIG. 1.2. . The container 38 has a billet loading hole 44, and the container sleeve 4 is inserted into the billet loading hole 44.
6 is installed.

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 advancing/retracting area by a drive device (path 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. An oil tank 62 is provided above the cylinder 16, and the oil tank 62 and a hydraulic oil inlet 64 at the rear end of the cylinder 16 are connected through a pipe 66. A damper 68 is installed in this pipe 66. The introduction port 64 includes the introduction port 6
A valve 0 for opening and closing 4 is installed. This valve 7
0 is opened and closed by a cylinder 72.

Side cylinders 78 are provided on the sides of the cylinder 60, and their piston rods 80, 82 are fixed to the head plate 56.

A position detection device 84 such as a linear scale is connected to the container 38 to detect its position.

In addition, the cylinder 16.25.28.40.76.7
8 is connected to a hydraulic pressure supply pipe (shown in the figure).

Although not shown, an oil pressure detection sensor for detecting the oil pressure in the extrusion cylinder 16 is provided, and detection signals from the sensor and the position detection device 84 are input to a controller (path shown).

A method of operating the extrusion press apparatus configured as described above will be explained next.

To perform extrusion from the state shown in FIG. 1.2, first place the billet 96 and dummy block 9 on the billet loader 52.
4, the ram 58 of the extrusion cylinder 16 is advanced to advance the stem 60, and the billet 96 together with the dummy block 94 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 advanced by side cylinders 76,78. Ram 5
8 moves forward, a large amount of hydraulic oil flows from the oil tank 62 into the extrusion cylinder 16 via the pipe 66.

Next, the billet loader 52 is retracted from the position between the container 38 and the extrusion cylinder 16. In addition, container 3
8 has been moved in advance by the container cylinder 40 so as to come into close contact with the die 24. After loading the billet 96 in this manner, the ram 58 is further advanced,
The billet 96 is strongly pressed and extruded from the die 24.

After extruding the billet, the container cylinder 5
0 is activated to move the container 38 away from the die 24. Next, the cylinder 30 of the cutting device 28 is activated and the cutting blade 32 is lowered to cut the product and the day cart. After cutting is completed, the cutting blade 32 is moved back to the standby state shown in FIG. 5 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.

Judgment of occurrence of paris is made by the ram 5 by the extrusion cylinder 16.
The determination is made based on the detection position (L) of the position detection device 84 when the pressing force of No. 8 reaches the peak pressure (pressure P in FIG. 3). That is, the distance d between the end face of the container 38 and the end face of the die 24 determined from this detection position (L)
When is larger than a predetermined value, it is determined that Paris has occurred, and when the zero interval d at which the alarm is activated by a signal from the controller is smaller than a predetermined value, it is determined that Paris has not occurred.
The extrusion process continues as it is.

[Effects] As described above, according to the present invention, the occurrence of paris can be automatically detected, the labor cost for extrusion work can be reduced, and the occurrence of paris can be accurately determined.

[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 pressure change diagram. 16... Extrusion cylinder, 24... Die, 28...
- Cutting device, 32... Cutting blade, 38... Container, 58... Ram, 60... Stem,
84...Position detection device.

Claims (1)

[Claims] (1) 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, and the end platen is disposed in this order from the downstream side in the extrusion direction. In an extrusion press device in which a platen is provided with a container cylinder for moving a container toward and away from an end platen, there is provided a means for detecting a maximum peak of pressure of the pressing device, and a means for detecting a maximum peak of pressure of the pressing device, and a container and a die at the time of the peak pressure. An extrusion press apparatus characterized by comprising: means for measuring the distance between the two.