JPH09164424A - Device for fixing stem of extrusion press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save space by shortening the length of a machine and also to easily execute attachment and detachment of a stem. SOLUTION: This device is a device for fixing the stem at the tip of a stem head, by supporting a stem holder 93 which is engaged with the rear end part of the stem to a crosshead 56 and also providing an opening part where the upper part of the stem holder 93 is opened in a U-shape, carrying-in and -out of the stem part to the opening part are enabled and simultaneously the rear end part of the stem is made to be attachable and detachable to the front end parts of the stem holder 93 and the crosshead 56.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stem fixing device for an extrusion press, which has a short machine length to save space and allows the stem to be easily attached and detached.

[0002]

2. Description of the Related Art Conventionally, the removal of the stem 60 is quick because of the necessity of improving the operation rate of the extrusion press.
It is important to carry out the installation work. From this,
If the extrusion process is continuously performed, the container tire 45
It is necessary to replace the container tire 45 and the stem 60 due to the damage to the billet or the change in the diameter of the billet 49. That is, when replacing the container tire 45,
If the stem 60 is left attached to the crosshead 56, it will be an obstacle to the removal and attachment of the container tire 45, so it is necessary to remove the stem 60.

A fixing device of a stem for an extrusion press inserts a stem into a crosshead ring, and inserts a stem holder ring which is slidable in an axial direction between a rear end taper of the stem and the crosshead ring. Place the tapered part on the inner surface of the insertion tube of the ring in contact with the tapered part of the stem, crimp the stem, insert the bolt through the bolt hole in the flange of the stem holder ring, and screw it into the crosshead ring. Since it was fixed to the stem, there was a lot of danger in attaching and detaching the stem, and it was inefficient because it took time to remove the nut that was bolted.

In order to eliminate these drawbacks,
The stem holder ring provided on the tapered portion at the rear end of the stem is rotatably provided, and the spline connection portion is provided at the rear end portion of the stem and the inner peripheral portion of the stem holder ring, and the stem holder ring is rotated to rotate the stem holder ring. It has been proposed that the stem can be attached to and detached from the stem holder ring or the tip of the crosshead.

[0005]

However, when removing the stem from the crosshead tip, any of the stems is hung by a crane or the like, and once the stem is removed from the container side to a position where it does not interfere with the crosshead. After moving to, the crane was used to pull it up, so the length between the container and the crosshead had to be lengthened, and as a result, the machine length became long. In addition, the work time required to attach the stem to the tip of the crosshead is long.

The present invention has been made in view of the above problems, and an object of the present invention is to shorten the machine length to save space and to easily attach and detach the stem for an extrusion press. To provide.

[0007]

In order to achieve the above object, according to a first aspect of the present invention, there is provided a device for fixing a stem to a tip of a crosshead, the device being fixed to a rear end portion of the stem. The stem holder to be mated is supported by the crosshead, and an opening is formed by opening the upper part of the stem holder in a U shape so that the stem portion can be carried in and out of the opening, and at the same time, the rear end portion of the stem. Is vertically removable with respect to the gap provided between the stem holder and the pressure ring fixed to the front end of the crosshead. Further, in the second invention mainly based on the first invention, a tension bolt for attracting the stem holder to the crosshead and a jack for moving the stem holder in a direction away from the crosshead against the tensile force of the tension bolt are provided. Make a different configuration.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In such a device of the present invention,
Operate the jack to leave the stem holder and the crosshead slightly separated, and then use a crane or the like while positioning the rear end of the stem from the top of the U-shaped opening above the stem holder to the front of the crosshead. After loading
When the operation of the jack is stopped, the space between the stem holder and the crosshead becomes narrower, and the rear end of the stem is fixed so that it cannot move between the stem holder and the crosshead, so the stem can be quickly attached and detached, and the machine length can be short .

[0009]

EXAMPLES Specific examples of the stem fixing device for an extrusion press according to the present invention will be described in detail below with reference to FIGS.

FIG. 1 is a plan view of an extrusion press equipped with a stem fixing device according to the present invention, FIG. 2 is a vertical sectional view of FIG. 1, and FIG.
Is a longitudinal sectional view of a main part of the stem fixing device, and FIG.
It is the front view seen.

Reference numeral 10 is a machine base, and an end platen 12 is fixed to one end side of the machine base, and a cylinder mounting block 14 is installed to the other end side thereof.
, An extrusion cylinder 16 is fixedly mounted. The end platen 12 has a lower portion on the side facing the extrusion cylinder 16 protruding to form a die supporting portion 20.
A die slide 22 is slidably mounted on the upper side in the machine width direction.

A die 24 is held on the die slide 22. 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. End platen 12
A bracket 26 is fixedly installed on the upper portion of the side facing the extrusion cylinder 16, and the cutting device 2 is attached to the bracket 26.
8 are provided. The cutting device 28 is for cutting a discard and a product portion, which will be described later, and a cutting blade 32 that is vertically stroked by a cylinder 30.
It has.

The end platen 12 and the cylinder mounting block 14 are connected by a column 34. A container guide (not shown) is provided at the end platen 12 side of the column 34, and a container 38 is arranged 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 in order to move the container 38 in the extrusion direction or the opposite direction. The tip of the piston rod 42 of the container cylinder 40 is connected to the container holder 38A. By moving the piston rod 42 of the container cylinder 40 forward and backward, the container holder 38A is moved in the left and right directions of FIGS. 1 and 2. You can

The container 38 mounted on the container holder 38A has a billet loading hole 44,
A container tire 45 is mounted in the billet loading hole 44. A billet loader (not shown) is provided between the container 38 and the die 24. The billet loader can be retracted from the stem advance / retreat area by a drive device (not shown). The extrusion cylinder 16 is provided with a ram 58, and a stem 60 is attached to the tip of the ram 58 via a crosshead 56 and an attachment member 54.

An oil reservoir tank 62 is provided on the upper side of the extrusion cylinder 16, and the oil reservoir tank 62 and the hydraulic oil inlet 64 at the rear end of the extrusion cylinder 16 are connected by a prefill valve 66. . The prefill valve 66 is provided with a butterfly valve 68. A valve 70 for opening and closing the introduction port 64 is installed in the introduction port 64. This valve 70 is a cylinder 72
It is opened and closed by. Side cylinders 76 and 78 are provided on the side of the extrusion cylinder 16, and piston rods 80 and 82 thereof are fixed to the crosshead 56. The cylinders 16, 25, 28,
A supply pipe for operating hydraulic pressure (not shown in FIGS. 1 and 2) is connected to 40, 76, and 78.

In this embodiment, a stem fixing device for an extrusion press used in the above-mentioned extrusion press will be described.

A pressure ring 91 is fixed to the front surface of the cross head 56, and the rear end surface of the stem 60 is brought into contact with the front surface of the pressure ring 91 so that the stem is provided in a gap between a stem holder 93 and the pressure ring 91 which will be described later. The stem 60 is fixed to the crosshead 56 by being carried in so that the flange portion 92 of 60 is slid in. The rear end side of the stem 60 is a substantially square flange portion 92.
A stem holder 93 is provided to hold the stem holder 6 toward.

After the flange portion 92 of the stem 60 is fixed to the front end portion of the crosshead 56 via the pressure ring 91, a wedge-shaped pressing member 99 as shown in FIG. 4 is attached to the upper end portion of the flange portion 92. Thus, the tilting and swinging of the stem 60 is prevented. Stem holder 9
Tension bolts 94 for pressing 3 onto the crosshead 56 are inserted through the stem holder 93 and the tension bolt insertion holes 95 formed in the crosshead 56, and nuts 96 are screwed at both ends thereof. . As shown in FIG. 3, a jack 97 having a ram is provided between the crosshead 56 and the stem holder 93. The jack 97 causes the stem holder 93 to move forward while opposing the tensile force of the tension bolt 94. It is configured to be moved to.

As shown in FIG. 4, the stem holder 93 is provided with an opening 98 having a U-shaped front surface. A band or the like is hung on the stem 60 and the stem 60 is hung by a crane or the like so that the stem holder 93 can be hung up. It is configured so that it can be loaded into and unloaded from the opening 98 from above and below. Also,
A total of six tension bolts 94 are provided on both sides of the opening 98 of the stem holder 93 in a state where three tension bolts are equally divided into three on each side.

The operation of the stem fixing device for an extrusion press thus configured will be described below.

First, a band or the like is applied to the stem 60, and the stem 60 is suspended by a crane or the like. Then, the jack 97 pushes the stem holder 93 to push the stem holder 93 away from the crosshead 56. The stem 60 is the opening 9 of the stem holder 93.
8 is introduced from above, and at the same time, the flange portion 92 of the stem 60 is slid in between the stem holder 93 and the pressure ring 91.

When the flange portion 92 is introduced to the front end portion of the pressure ring 91, the hydraulic pressure of the jack 97 is released.
Then, the tension bolt 94 pulls the stem holder 93 to the right side in FIG. 3, and the stem 60 is fixed to the crosshead 56 via the pressure ring 91.

After the stem 60 is mounted on the crosshead 56 and then the extrusion is performed from the state shown in FIGS. 1 and 2, first, during the extrusion of the previous cycle, the billet for the next cycle (the length is measured) The billet loader is received by the billet loader and partially raised to a position where it does not interfere with the container 38 and the die 24. With the billet 49 placed on the billet loader 52, the billet 49 is raised to the extrusion center position of the billet 49.

Then, the stem 60 is advanced to sandwich the billet between the stem 60 and the die 24, and then the container 38 is advanced to insert the billet into the billet loading hole 4 of the container 38.
Load in 4

Next, the billet loader is retracted from the position between the container 38 and the die 24. After the charging of the billet 49 is completed in this way, the ram 58 is further advanced and the billet is strongly pressed and pushed out from the die 24. Upon this strong advance of the ram 58, the valve 70 is closed and instead the hydraulic pressure is supplied into the extrusion cylinder 16 via another valve.

After the billet has been extruded, the container cylinder 40 is operated to move the container 38 into the die 24.
And move the ram 58 away from the position where the discard is removed from the container 38. Then, the cylinder 30 of the cutting device 28 is operated to operate the cutting blade 3
The product and discard are cut by lowering 2. After the cutting is completed, the cutting blade 32 is retracted by the cylinder 30 to the standby state shown in FIG. In addition, the container 38 and the ram 58 are retracted to a predetermined standby position by the simultaneous operation, and the next extrusion press process is started. The ram 58 is retracted by the side cylinders 76 and 78.

When the ram 58 is retracted by the side cylinders 76, 78, the residual pressure is first released by the pressure relief valve, and then the working oil in the extrusion cylinder 16 is discharged from the prefill valve 66 dedicated for oil discharge to the oil reservoir. It is returned to the tank 62. When the stem 60 is removed after such a series of extrusion steps, first, a band or the like is put on the stem 60 and the stem 60 is suspended by a crane or the like prior to this. Next, the pressing member 99 is released, and then the jack 97 is projected to operate to slightly advance the stem holder 93, and the stem 60 is pulled upward with the space between the stem holder 93 and the pressure ring 91 being loosened. Then, the desired new stem 60 is replaced.

[0028]

As apparent from the above description, the present invention has the following advantages. That is, the machine length can be shortened to save space and the stem can be attached and detached in a short time. Since the stem can be easily attached and detached, the danger of stem replacement work can be avoided.

[Brief description of the drawings]

FIG. 1 is a plan view of an extrusion press equipped with a stem fixing device according to the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a longitudinal sectional view of a main part of the stem fixing device.

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

[Explanation of symbols]

 10 Machine Base 12 End Platen 14 Cylinder Mounting Block 16 Extrusion Cylinder 22 Die Slide 24 Die 28 Cutting Device 38 Column 45 Container Tire 56 Crosshead 60 Stem 91 Pressure Ring 92 Flange 93 Stem Holder 94 Tension Bolt 95 Tension Bolt Insertion Hole 96 Nut 97 Jack 98 Opening 99 Pressing member

Claims (2)

[Claims] 1. A device for fixing a stem to a tip of a crosshead, wherein a stem holder engaging with a rear end of the stem is supported by the crosshead, and an upper portion of the stem holder is opened in a U shape. The opening portion is provided to allow the stem portion to be carried in and out of the opening portion, and at the same time, the rear end portion of the stem is provided in the gap provided between the stem holder and the pressure ring fixed to the front end portion of the crosshead. On the other hand, a stem fixing device for an extrusion press, which is removable in the vertical direction. 2. A tension bolt for attracting the stem holder according to claim 1 to a crosshead, and a jack for moving the stem holder in a direction away from the crosshead against a tensile force of the tension bolt. Stem fixing device for extrusion press.