JPH09108728A - Extrusion pressing method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably charge a billet, to shorten a main cylinder and to shorten the idle time by charging the billet inside a container while advancing an extrusion stem to the advancing limit by supplying a pressure oil to a center cylinder, advancing a main ram and extruding the billet. SOLUTION: When a pressure oil is introduced to a piston head side of a center cylinder 47, an extrusion stem 34 is advanced until a stem holder 59 is brought into contact with an engaging part of a stem head 56, and a billet 80 is charged in a billet charging hole 44 of a container 38. After finishing the charge of the billet 80 in such a way, the main ram 58 is advanced further, the container 38 and the main ram 58 are once retreated and a die 24 face is opened, after burp cycle is finished, the container 38 is advanced again and brought into close contact with the die 24. Next, the main ram 58 is advanced again, the billet is pressed forcibly, and the extrusion article is extruded from the die 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion press apparatus, and more particularly to an extrusion press method and apparatus for reducing idle time by shortening a stroke of a main cylinder.

[0002]

2. Description of the Related Art Conventionally, an extrusion press loads a billet into a fixed container, extrudes the billet with a stem driven by a ram cylinder, and molds it into a predetermined cross-sectional shape with a die attached to the outlet of the container. It is like this. Billets loaded into such a molding machine are supplied by a billet loader, and each billet sent from a billet carrier arranged on the side of the molding machine is gripped one by one, and the billet of the container is billed. It is configured to be transferred to a loading port, delivered by a stem in a state where the billet and the loading port are aligned with each other, loaded into a container, and pressed and molded.

When a billet placed on such a billet loader is once loaded into a container, an extrusion press device is used as shown in FIGS. 6 and 7. That is, in FIG. 6, the container 38 is brought into contact with the die 24 after the billet is positioned between the die 24 and the extrusion stem 34.
Subsequently, the extrusion stem 34 is moved forward to obtain a desired product from the die 24, which is a so-called front loading type. The other one is that the container 38 is brought into contact with the die 24 as shown in FIG. After moving the extruding stems 34 retracted to the outside with the stem slider sliding cylinder 6 from the press center to the outside, the billet pusher 8 is positioned at the press center and then the billet 80 placed on the billet loader is moved to the press center. There is a rear loading type extrusion press that is designed to be transported.

[0004]

However, the front loading type extrusion press shown in FIG. 6 has the following problems. That is, the container 38 is advanced to the die 24 side while the billet 80 is sandwiched between the die 24 and the extrusion stem 34, and then the extrusion operation is performed with the billet 80 housed in the container 38. Needs to be released in accordance with the billet loading operation, and the billet charge is unstable. With the billet 80 placed on the billet loader, the billet loader is moved from the machine side to the center of the extrusion by the linear motion of the billet loader engaged with the cylinder. The sex is bad. The short billet 80 cannot be pushed. Furthermore, a billet 80 is placed between the container 38 and the die 24.
Is supplied, the idle time becomes longer due to the open supply of the container 38 and the like.

The rear loading type extrusion press shown in FIG. 7 has the following problems. That is, since the length between the rear end surface of the container 38 (the end surface on the side of the extrusion stem 34) and the extrusion action surface 34a of the extrusion stem 34 is short,
When the container 38 and the extruding stem 34 overlap each other when the container 38 is retracted after the extrusion and the cutting device 28 cuts the discards remaining in the die 24, the stem slide operation by inserting the next billet 80 is performed.
This is done after the container 38 is moved forward to the die 24 side, and the idle time is lengthened by the stem slide operation (movement from the center of the press to the machine side). When the container sleeve needs to be replaced due to wear or the like, it is necessary to remove the extrusion stem 34 because the retracting allowance (a) of the container 38 is small, and it takes time to remove and reattach the extrusion stem 34. Product productivity decreases accordingly. Since the billet 80 (also referred to as a telesco cylinder) is mounted on the stem slider 4 in parallel with the extrusion stem 34, the entire machine length of the extrusion press is increased by the minimum length of the billet pusher 8 at the time of contraction.

The present invention has been made in view of the above problems, and an object of the present invention is to enable the conventional stable billet charging and to shorten the main cylinder to shorten the idle time. An object is to provide an extrusion press device. Do

[0007]

In order to achieve the above object, according to the first aspect of the present invention, pressure oil is supplied to a center cylinder when a billet placed on a billet loader is loaded in a container. Then, the billet is loaded into the container while advancing the extruding stem to the limit of advancing, and the billet is extruded while advancing the main ram after engaging the connecting shaft with the subsequent engaging member. The second aspect of the present invention
In the invention, an end platen, a die, a container, and a pusher cylinder holding a stem for pressing a billet inside the container are provided slidably provided with a main ram engaged with an extrusion cylinder so as to be slidable back and forth. At the same time, a center cylinder is arranged in series at the rear of the extruding cylinder, a moving head is fixed to the tip of the piston rod of the center cylinder inserted into the main ram, and the pressure ring and the pressure ring are connected by a connecting shaft. The extruding stem is sandwiched between a stem holder and a pressure ring, and a stem head for restricting the forward limit of the extruding stem is arranged at the tip of the main ram via a connecting member. In the invention, at the rear end of the stem head,
A projecting posture that projects between the pressure ring and the moving head and engages with the connecting shaft and transmits the pressing force of the main ram to the billet through the extrusion stem, and withdraws from the connecting shaft to allow the extrusion stem to move backward. An engaging member that can assume a retracted posture is provided, and a drive device for advancing and retracting the engaging member is provided. Further, according to a fourth aspect of the invention, which is mainly based on the second aspect, the pressure ring holding the extrusion stem and the moving head are movable in the main ram and the stem head so that they can move relative to each other. The inside has the same diameter.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, the end platen, the die, the container, the extrusion stem, the main ram engaged with the extrusion cylinder, and the center cylinder are arranged in series, so that the billet is loaded into the container. In doing so, the piston rod of the center cylinder is advanced while the billet is placed on the billet loader, and the extrusion stem is advanced to the extent of advancement of the stem head. And
After locking the locking member to the connecting shaft and introducing hydraulic oil into the extrusion cylinder to move the main cylinder forward, the billet loaded in the container is extruded from the die as an extruded product, so the main cylinder is short. It can be done and idle time can be shortened.

[0009]

EXAMPLES Specific examples of the extrusion press method and apparatus according to the present invention will be described in detail below with reference to FIGS. 1 to 5.

FIG. 1 is a front sectional view of an extrusion press apparatus showing an initial position of an extrusion stem according to the present invention, and FIG.
Is a front cross-sectional view of an extrusion press device showing a forward limit state of an extrusion stem in which a billet is loaded in a container, FIG. 3 is a cross-sectional view of a main part of an engaging member, and FIG. 4 is a front view seen from AA of FIG.
FIG. 5 shows a plan view of the extrusion press machine.

Reference numeral 10 denotes a machine base, one end side of which is fixedly provided with an end platen 12 and the other end side of which is provided with a cylinder mounting block 14, and the cylinder mounting block 1
An extrusion cylinder 16 is fixed to 4. The end platen 12 has a lower portion on the side facing the extrusion cylinder 16 that protrudes to form a die supporting portion 20.
A die slide 22 is installed on the surface of the machine 0 so as to be slidable in the machine width direction. Dice 2 on this die slide 22
4 is held.

The die slide 22 is the end platen 12.
Is moved in the machine width direction by a cylinder 25 provided on the side of the machine. Further, it is possible to reciprocate between the extrusion operation position located on the back surface of the end platen 12 (the surface on the extrusion cylinder 16 side) and the die replacement position pulled out from the back 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 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 33. A container guide (not shown) is provided on the end platen 12 side of the column 33, and a container 38 is installed along the container guide so as to be movable in the extrusion direction. A container cylinder 40 is provided on the end platen 12 to move the container 38 in the pushing direction or the opposite direction.

Piston rod 4 of container cylinder 40
The tip of 2 is connected to 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 FIG. 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 extrusion cylinder 16 is provided with a main ram 58, and a stem head 56 is integrally fixed to the front end portion of the main ram 58 via a connecting member 55, and the main ram 58 is inside the extrusion cylinder 16. Is configured to be slidable. Inside the main ram 58, a moving head 49, a pressure ring, and a stem holder 59 have the same diameter so that they can slide back and forth as will be described later. Also,
A center cylinder 47 is arranged at the rear end of the extrusion cylinder 16 on the same axis as the extrusion cylinder 16. Further, the center cylinder 47 is engaged with the center cylinder 47 and is attached to the tip of a piston rod 48 which can move forward and backward. The moving head 49 is fixed, and the moving head 49 is attached to the main ram 58.
It is arranged so that it can move forward and backward.

A pressure ring 51 is fixed to a position separated from the moving head 49 via a connecting shaft 50. The pressure ring 51 is provided with a base portion of the extrusion stem 34 with the extrusion acting surface 34a facing the end platen 12, and the base portion of the extrusion stem 34 is sandwiched between the refresher ring 51 and the stem holder 59.
Reference numeral 71 denotes a fix damy block, which is attached to the tip portion of the extruding stem 34 and is adapted to be extruded through the fix damy block when the billet 80 is extruded.

A fitting member 72 as a lid is attached to the rear end of the push-out cylinder 16 with a bolt or the like, and the center of the fitting member 72 and the main ram 58 is a hole through which the piston rod 48 can move forward and backward. The V packing 73 is inserted between the piston rod 48 and the fitting member 72, the main ram 58 and the center cylinder 47 so that the hydraulic oil from the center cylinder 47 side does not leak.

In particular, in this embodiment, as shown in FIG. 1, for the length L0 between the position where the container 38 is in contact with the die 24 and the retracted position of the extrusion stem 34, the center is used instead of the conventional moving cylinder. By providing the cylinder 47 and setting the length of the center cylinder 47 to L0 + α, the same function as the moving cylinder can be obtained.
Further, the main ram 58 is adapted to apply the pressing force of the billet 80 loaded in the container 38 by the forward movement of the extrusion stem 34 to obtain an extruded product from the die 24, which is different from the conventional main ram 58. It has become significantly shorter.

At the front end of the stem holder 59, a stepped locking portion 60 is disposed, and this locking portion 60 is loosely fitted to the stem holder 59, being smaller than the inner diameter of the stem holder 59 and larger than the outer diameter of the extruding stem 34. The extrusion stem 34 is configured to have a shape and regulates the forward limit of the extrusion stem 34, and the extrusion stem 34 can freely move back and forth. Also, the stem holder 59
A stepped recess 62 is provided at the rear end of the billet 80. The recess 62 projects between the pressure ring 51 and the moving head 49 to engage with the connecting shaft 50. A pair of engagement members 61 are provided in the recess 62 so that the projections can be transmitted.

On the contrary, the engaging member 61 is constructed so that it can take a retracted posture from the connecting shaft 50 to the retracted limit.
The opening / closing of the pair of engaging members 61 (61R, 61L) is performed by an opening / closing cylinder 63 (63) that constitutes a forward / backward drive unit 65.
R, 63L) piston rod 64 (64R, 64L)
It is made possible by the expansion and contraction of.

An oil reservoir tank 67 is provided on the upper side of the extrusion cylinder 16, and as shown in FIG. 5, a hydraulic oil introduction is provided at the corner of the oil reservoir tank 67 and the rear end of the extrusion cylinder 16. A hydraulic oil pipe 69 is connected to the port 68, and a valve 70 that opens and closes the hydraulic oil inlet is installed in the hydraulic oil pipe 69.

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

To carry out extrusion from the state shown in FIG.
First, during the extrusion of the previous cycle, the long billet 80 for the next cycle (the one whose length has been measured) is set to the billet loader 52.
It is partially raised to a position where it does not interfere with the container 38 and the main ram 58. Next, the billet loader 52 is raised to the center of the press. And the center cylinder 4
When pressure oil is introduced into the piston head side of No. 7, the extruding stem 34 moves forward until the stem holder 59 contacts the engaging portion 60 of the stem head 56 as shown in FIG.
Is loaded into the billet loading hole 44 of the container 38. On the contrary, in the case of the short billet 80, even after the stem holder 59 contacts the locking portion 60 of the stem head 56, the tip of the extruding stem 34 is pushed into the container 38 by the center cylinder 47 until just before the billet 80 starts to be upset. Of.

Next, the billet loader 52 is retracted from the position between the container 38 and the extrusion cylinder 16, and the opening / closing cylinders 63R and 63L of the advancing / retreating drive device 65 are also retracted.
The piston rods 64R and 64L are extended to engage the engaging members 61R and 61L with the connecting shaft 50. Then, subsequently, when the valve 70 is opened, the hydraulic oil is introduced into the extrusion cylinder 16 from the oil reservoir tank 67.

The container 38 is moved in advance by the container cylinder 40 so as to come into close contact with the die 24. In this way, after the billet 80 is completely loaded, the main ram 58 is further advanced and the container 38
Then, the main ram 58 is temporarily retracted to open the surface of the die 24, and after the barp cycle is performed, the container 38 is advanced again to be brought into close contact with the die 24. Next, the main ram 58 is advanced again to strongly press the billet 80, and the extruded product is extruded from the die 24.

After the billet 80 has been extruded, the container cylinder 40 is operated to move the container 38 into the die 2.
4, so that the discard is removed from the container 38 and the main ram 58 is retracted. Then, the cylinder 30 of the cutting device 28 is operated,
The extruded product and the discard are cut and separated by lowering the cutting blade 32.

After the cutting is completed, the cutting blade 3 is moved by the cylinder 30.
2 is retracted to the standby state of FIG. When the container cylinder 40 is operated to separate the container 38 from the die 24, pressure oil is first introduced to the piston rod 48 side of the center cylinder 47 to set the extrusion stem 34 to the backward limit (state of FIG. 2). Back up. Thereafter, the piston rods 64R, 64L of the opening / closing cylinders 63R, 63L of the advancing / retreating drive device 65 are retracted to separate the engaging members 61R, 61L from the connecting shaft 50, and the engaging member 61R,
The 61L is retreated to the retreat limit. After that, the main 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.

In the present embodiment, the coupling is performed by opening and closing the engaging member 61, but the invention is not limited to this, and the billet 80 is extruded while the extruding stem 34 is held in a pressed state by a hydraulic tightening lock system. You can also do it.

[0030]

As apparent from the above description, the present invention has the following advantages. In other words, since the main ram is not operated until the billet enters the container, the length of the main ram can be shortened and thus the stroke can be shortened. When the billet placed on the billet loader is extruded and the billet is loaded into the container, the piston rod of the center cylinder with a small diameter is moved forward. There is no need to load the billet inside, and the extrusion stem can be advanced rapidly, which shortens the idle time accordingly and stabilizes the billet charge.

[Brief description of the drawings]

FIG. 1 is a front sectional view of an extrusion press device showing an initial position of an extrusion stem according to the present invention.

FIG. 2 is a front cross-sectional view of an extrusion press device showing a forward limit state of an extrusion stem in which a billet is loaded in a container.

FIG. 3 is a sectional view of an essential part of an engaging member.

FIG. 4 is a front view as seen from AA of FIG.

FIG. 5 shows a plan view of an extrusion press device.

FIG. 6 is a front-loading type extrusion press device.

FIG. 7 is a rear loading type extrusion press device.

FIG. 8 is a front view seen from BB of FIG. 7.

[Explanation of symbols]

 10 Machine Base 12 End Platen 14 Mounting Block 16 Extrusion Cylinder 20 Die Support 22 Die Slide 24 Die 28 Cutting Device 30 Cylinder 32 Cutting Blade 34 Extrusion Stem 34a Extrusion Action Surface 38 Container 38A Container Holder 44 Billet Loading Hole 46 Container Sleeve 47 Center Cylinder 48 Piston rod 49 Moving head 50 Connecting shaft 51 Pressure ring 52 Billet loader 56 Stem head 58 Main ram 59 Stem holder 60 Locking part 61 (61R, 61L) Locking member 62 Recessed part 63 (63R, 63L) Open / close cylinder 64 (64R) , 64L) Piston rod 65 Drive device for advancing / retreating 68 Operating inlet 69 Operating oil piping 70 Valve 71 Fixed damy block 72 Fitting member 73 V pack Kin 80 Billet

Claims (4)

[Claims] 1. When a billet placed on a billet loader is loaded into the container, pressure oil is supplied to the center cylinder to advance the extrusion stem to the forward limit while loading the billet into the container, and the subsequent operation is continued. An extrusion pressing method characterized in that the billet is extruded while advancing the main ram after engaging with the connecting shaft by the joining member. 2. A main ram slidably provided with an end platen, a die, a container, and a pressure ring holding a stem for pressing a billet in the container is engaged with an extrusion cylinder to be slidable back and forth. In addition, a center cylinder is arranged in series at the rear of the extruding cylinder, a moving head is fixed to the tip of the piston rod of the center cylinder inserted into the main ram, and the pressure ring is connected by a connecting shaft. An extruding press device, wherein the extruding stem is sandwiched between a stem holder and a pressure ring, and a stem head for restricting a forward limit of the extruding stem is arranged at a tip of the main ram via a connecting member. 3. The rear end of the stem head according to claim 1, projecting between the pressure ring and the moving head to engage with the connecting shaft and to transmit the pressing force of the main ram to the billet through the extruding stem. An extrusion press, characterized in that an engagement member capable of taking a posture and a retracted posture in which the push-out stem is retracted from the connecting shaft to allow the push-out stem to be retracted and a drive device for advancing and retracting the engagement member are provided. apparatus. 4. The main ram and the stem head have the same diameter so that the pressure ring and the moving head holding the extrusion stem according to claim 1 can move between the main ram and the stem head. An extrusion press device characterized by the above.