JPH07102387B2 - Extrusion press equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion press device, and more particularly to an extrusion press device configured to detect occurrence of burrs.

[Prior Art] When extrusion pressing is performed by 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. (Usually, a dummy block is interposed between the stem and the billet.) Then, the ram is further advanced to strongly press the billet with the stem, and the billet is extruded from the die as an extruded product having a predetermined shape. After the extrusion is completed, the container is slightly retracted by the container cylinder, the billet (referred to as discard) remaining after the extrusion is discharged from the inside of the container, and the cutting blade of the cutting device is fed between the container and the die. Disconnect the product and discard from.

After that, the ram is retracted, the stem is extracted from the container, the next billet is inserted into the container, and the extrusion press operation of the next cycle is performed.

[Problems to be Solved by the Invention] If a gap is present between the container end face and the die end face, burrs occur. In the past, the operator checked the occurrence of burrs by visual observation, so the labor cost required for the extrusion press operation increased, misidentification occurred, and trouble occurred when the next billet was extruded. There was a risk that

[Means for Solving the Problem] The present invention includes an end platen, a die, a container, and a pressing device having a ram provided with a stem for pressing a billet in the container at the tip thereof in the order of the downstream side in the extrusion direction. In the extrusion press device, wherein the end platen is provided with a container cylinder for moving the container in the contact direction with respect to the end platen, means for detecting the maximum peak of the pressure of the pressing device, A means for measuring the distance between the container and the die at the peak pressure is provided.

[Operation] When the stem presses the billet in the container, a frictional force acts between the outer peripheral surface of the billet and the inner peripheral surface of the container, and the container itself receives the forward pressure of the ram. At the initial 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 large, so the ram forward pressure transmitted to the container is also large. Further, the ram advancing pressure transmitted to the container becomes smaller as the amount of billet remaining in the container becomes smaller in the latter stage of extrusion. Therefore, as shown in FIG. 3, the pressing force of the pressing device rapidly increases to the maximum value immediately after the start of extrusion (time t ₁ ) and then gradually decreases until the end of extrusion (time t ₂ ). Become.

At the peak pressure immediately after the start of extrusion, the pressure at 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, the occurrence of burrs can be determined by detecting the distance d between the two end faces at this peak pressure. That is, when the distance d is larger than a predetermined value (for example, 0.5 mm), it is determined that burr has occurred, and when it is longer than that, it is determined that there is no burr. Since this judgment can be made by an electric circuit, the judgment of the occurrence of burrs can be automated and can be linked with an alarm device, a burrs removing device and the like.

[Embodiment] The configuration of the extrusion press device according to the embodiment will be described below with reference to Figs.

FIG. 1 is a plan view of a main part of an extrusion press machine, and FIG. 2 is a sectional view taken along the extrusion direction.

Reference numeral 10 is a machine base, and an end platen is provided on one end side.
12 is fixed, a cylinder mounting block 14 is installed on the other end side, and an extrusion cylinder 16 is fixed to the cylinder mounting block 14. The end platen 12 has a lower portion on the side facing the extrusion cylinder 16 protruding to form a die supporting portion 20, and a die slide 22 is installed on the die supporting portion 20 so as to be slidable in the machine width direction. A die 24 is held on the die 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 back surface of the end platen 12 (the surface on the extrusion cylinder 16 side)
It is possible to reciprocate between the extrusion operation position located at the position (1) and the die replacement position that is pulled out from the rear surface of the end platen 12.

A bracket 26 is fixedly provided on an upper portion of the end platen 12 facing the extrusion cylinder 16, and a cutting device 28 is provided on the bracket 26. The cutting device 28 is for cutting the discard and the extruded product portion into a container described later, and includes a cutting blade 32 that is vertically stroked 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 on the end platen 12 side of the column 34, and a container 38 is installed along the container guide so as to be movable in the extrusion direction.

A container cylinder (container moving cylinder) for moving the container 38 in the extrusion direction or the opposite direction.
40 is provided on the end platen 12. The tip of the piston rod 42 of the container cylinder 40 is connected to the container 38. By projecting and retracting the piston rod 42 of the container cylinder 40, the container 38 can be moved in the left and right directions in FIGS. . Note that the container
38 has a billet loading hole 44.
A container sleeve 46 is mounted in the inside of 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 advance / retreat area by a drive device (not shown).

The push-out cylinder 16 is provided with a ram 58, and a stem is attached to the tip of the ram 58 via a head plate 56 and a mounting member 54.
60 is attached. An oil tank 62 is provided on the upper side of the cylinder 16, and the oil tank 62 and the hydraulic oil inlet 64 at the rear end of the cylinder 16 are connected by a pipe 66. A damper 68 is arranged in the pipe 66. The inlet 70 is provided with a valve 70 for opening and closing the inlet 64. The valve 70 is opened and closed by a cylinder 72.

Side cylinders 76 and 78 are provided on the side of the cylinder 60, and their piston rods 80 and 82 are fixed to the head plate 56.

A position detecting device 84 such as a linear scale for detecting the position of the container 38 is connected to the container 38.

A supply pipe (not shown) for operating hydraulic pressure is connected to the cylinders 16, 25, 28, 40, 76, 78. Although not shown, a hydraulic pressure detection sensor for detecting the hydraulic pressure in the extrusion cylinder 16 is provided, and the detection signals of the sensor and the position detection device 84 are input to a controller (not shown).

Next, a method of operating the extrusion press device configured as described above will be described.

To perform extrusion from the state shown in FIGS. 1 and 2, first, the billet 96 and the dummy block 94 are placed on the billet loader 52. Then the ram 58 of the extrusion cylinder 16 is advanced to move the stem
60 is advanced to load the billet 96 together with the dummy block 94 into the billet loading hole 44 of the container 38. This lamb 58
The valve 70 is opened and the ram 58 is
It is advanced by 76 and 78. As the ram 58 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 moved to the container 38 and the extrusion cylinder 16
Withdraw from the position between and. The container 38 has been moved in advance by the container cylinder 40 so as to come into close contact (contact) with the die 24. After the charging of the billet 96 is completed in this way, the ram 58 is further advanced and the billet 96 is strongly pressed and pushed out from the die 24.

After the billet has been extruded, the container cylinder 50
Is operated to move the container 38 so as to separate from the die 24. Next, the cylinder 30 of the cutting device 28 is operated and the cutting blade 32 is lowered to cut the product from the discard. After the cutting is completed, the cutting blade 32 is retracted by the cylinder 30 to the standby state shown in FIG. Then lamb
58 is retracted to the designated standby position and the container 38
Is closely attached to the die 24, and the process proceeds to the next extrusion press step. The ram 58 is retracted by the side cylinders 76 and 78.

The occurrence of burrs is determined by the detection position (L) of the position detection device 84 when the pressing force of the ram 58 by the extrusion cylinder 16 reaches the peak pressure (pressure P in FIG. 3). That is, when the distance d between the end surface of the container 38 and the end surface of the die 24, which is obtained from the detection position (L), is larger than a predetermined value, it is determined that burrs have occurred, and the alarm device is activated by a signal from the controller. It When the distance d is smaller than the predetermined value, it is determined that no burr is generated, and the extrusion process proceeds as it is.

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

[Brief description of drawings]

FIG. 1 is a plan view of the embodiment apparatus, FIG. 2 is a longitudinal sectional view, and FIG.
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 provided with a stem for pressing a billet in the container at its tip are arranged in this order from the downstream side in the extrusion direction, In the extrusion press device in which the end platen is provided with a container cylinder for moving the container in the contact direction with respect to the end platen,
An extrusion press apparatus comprising: a means for detecting the maximum peak pressure of the pressing device; and a means for measuring the distance between the container and the die at the peak pressure.