JPH0790261B2 - Extrusion press equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an extrusion press apparatus, and more particularly to an extrusion press apparatus intended to shorten idle time between pressing steps.

[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. (In addition, a stem-fixed dummy block is usually attached, but a dummy block may be interposed between the stem and the billet.) Then, the ram is further advanced to press the billet strongly with the stem, The billet is extruded as an extruded product having a predetermined shape.

After pushing out the billet, the container is slightly retracted by the container cylinder, and the main ram is retracted from the position where the disguard is disengaged from the container. Next, the cutting blade of the cutting device is fed between the container and the die to separate the remaining billet (called discard) on the front surface of the die 24.

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] The conventional device has the following problems.

When the ram was retracted after the billet was pushed out, the ram was retracted to the limit. For this reason, the stem is retracted more than necessary, the stroke of the stem requires a long time, and the idle time between the pressing steps is unduly long.

[Means for Solving the Problems] 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. The present invention relates to an extrusion press device provided by

A ram position detecting device is provided, and when the ram of the pressing device is retracted, it can be stopped in the middle of a stroke having a minimum gap required for inserting a billet for the next cycle into the container.

[Operation] The piston rod of the container cylinder is stopped in the middle of the stroke so that the minimum gap required for the cutting blade of the cutting device to enter is formed between the die and the container. Therefore, the stroke time of the container cylinder (the time required to move the container) is shortened.

[Embodiment] Hereinafter, the configuration of the extrusion press device according to the embodiment will be described.
This will be described with reference to FIG.

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 at one end
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 a discard of a die 24 and a product portion, which will be 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) 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 the container holder
38A, and by moving the piston rod 42 of the container cylinder 40 forward and backward, the container holder 38A can be moved in the left-right direction in FIGS. The container 38 mounted in the container holder 38A has a billet loading hole 44, and a container sleeve 46 is loaded 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 advance / retreat area by a drive device (not shown).

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

Side cylinders 76, 78 are provided on the side of the pushing cylinder 16, and their piston rods 80, 82 are fixed to the head plate 56.

The head plate 56 and the container holder 38A are connected to a position detecting device 90 such as a linear scale for detecting their positions.

A supply pipe (not shown in FIGS. 1 and 2) for operating hydraulic pressure is connected to the cylinders 16, 25, 28, 40, 76, 78.

FIG. 3 is a hydraulic piping system diagram of the extrusion press device, which shows the container cylinders 40, the side cylinders 76, 78, and the extrusion cylinders 16 from the main pumps 84, 86 (in the case of two pumps).
Etc. is supplied with hydraulic pressure. Reference symbols V _{1 to} V _{13 in} FIG. 3 denote valves.

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, during extrusion of the previous cycle, the billet 96 for the next cycle (of which length measurement has been completed) is received by the billet loader 52 and the container 38 and the main ram are received. 58 is partially raised to the position where you want to interfere with it. Next, the billet loader 52 is raised to the center of the press. Then, the ram 58 of the extrusion cylinder 16 is 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 advances, the valve 70 is opened, and the ram 58 is advanced by the side cylinders 76 and 78. As the ram 58 advances, a large amount of hydraulic oil flows from the oil reservoir tank 62 into the extrusion cylinder 16 through the prefill valve 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. Upon this strong advance of the ram 58, valve 70 is closed and valve V
₁₂ is opened, and the working hydraulic pressure is supplied into the extrusion cylinder 16.

Container cylinder after extrusion of billet 96 is completed
40 is actuated to move the container 38 away from the die 24. The ram 58 is retracted from the position where the discard is removed from the container 38. 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. After that, the ram 58 is retracted to a predetermined standby position, the container 38 is brought into close contact with 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.

When the ram 58 is retracted by the side cylinders 76 and 78, the valves V ₉ and V ₁₀ are first opened to release the residual extrusion pressure, and then the hydraulic oil in the extrusion cylinder 16 is discharged from the prefill valve 66 dedicated to oil discharge. It is returned to the oil reservoir tank 62.

In this embodiment, the position detecting device is used when the ram 58 is retracted.
The position of the ram 58 is continuously detected by 90, and the minimum gap required to insert the billet of the length necessary for the extrusion of the next cycle into the container 38 is set by the container 38 and the stem 60.
The ram 58 is stopped when it is partially retracted so that it is formed between itself and the tip of the ram 58. Therefore, the stroke time required for retreating and advancing the ram 58 is short.

For this reason, the idle time is extremely short in the device of this embodiment.

[Effects of the Invention] As is clear from the above embodiments, according to the device of the present invention, the moving distance of the ram is shortened, and the idle time between the extrusion press steps is significantly shortened. As a result, the operating efficiency of the extrusion press device is improved.

[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 hydraulic system diagram. 16 …… Extrusion cylinder, 24 …… Die, 28 …… Cutting device,
32 …… Cutting blade, 38 …… Container, 58 …… Ram, 60 …… Stem, 90 …… Position detection device.

Claims (1)

[Claims] 1. An extrusion method in which an end platen, a die, a container, and a pressing device having a ram with a stem for pressing a billet in the container provided at the tip are arranged in this order from the downstream side in the extrusion direction. In the pressing device, the ram position detecting device is provided, and when the ram of the pressing device is retracted, it is possible to stop in the middle of the stroke having the minimum gap required for inserting the billet of the next cycle into the container. Characteristic extrusion press equipment.