JPS5914283B2 - indirect extrusion press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an indirect extrusion press, and more particularly, to an improvement of an indirect extrusion press that is equipped with a hydraulic coupling device and configured to be able to add a container moving force to the extrusion force.

In the conventional indirect extrusion press shown in FIG.
52 are firmly connected by diagonally arranged tie rods 53 to form the press frame structure into a rigid frame structure.

The main ram 55 is attached to the main cylinder 54 of the main cylinder frame 52.
The cross head 56, pressurizing stem 71, etc. constitute an extrusion force generating device, and the cross head 56 and main cylinder frame 52 can be moved forward without load by a side cylinder device consisting of a side cylinder 57 and a piston 58. It consists of

On the other hand, a cylindrical die stem 14 is fixed to the press center of the press platen 51, and the die 3 is attached to the die stem 74 via a die holder 72.

The container 70 can freely move forward and backward in the press direction via the container moving cylinder device 6L62, and the relative position of the container 70 and the pressurizing stem 11 is determined by the hydraulic compressing device 59.
, 60.

That is, the container moving cylinder 61 is attached to the main cylinder frame 52, and the cylinder 59 of the hydraulic compressing device is attached to the crosshead 56, and is fitted to the main cylinder frame 52. Fitting pistons 62 and 60 are connected to each cylinder 61 and 59, and the rear frame 76 and container holder 69 are connected by a tie rod 77.

Additionally, in FIG. 1, reference numeral 63 denotes an intermediate frame, which is movable by a hydraulic cylinder device consisting of a cylinder 64 and a piston 65, and is fitted to the die stem 74 via a guide block 75 and the like.

The intermediate frame 63 has a hydraulic cylinder 66 and a piston 6T.
It is equipped with a vertical shear device consisting of a shear blade 68 that cuts the discard and extruded material.

According to the conventional example shown in FIG. 1, the billet accommodated in the container 70 is placed over the die stem 74 with the container 70 and the pressure stem 11 fixed (
By extruding as shown, the container is indirectly extruded through the diameter 3, and the amount of force for moving the container during extrusion is controlled by the main cylinder 54.
However, this conventional example has the following problems.

That is, the full force of the press during extrusion is the force acting on the main cylinder 54 and the side cylinders 57, and the force acting on the container system, and in order to have a structure that can withstand this full force of the press, the press platen 51, main cylinder frame 52, it is the main component of the rigid frame press frame consisting of the die rod 53 that connects these, and the durability of the main component must be designed to at least accommodate the added moving force of the container system. However, the number of parts increases accordingly.
This results in a more complicated structure and an increase in weight.

The present invention has been devised in view of the above-mentioned circumstances, and even if the container moving force is added to the pushing force, the press frame does not have to bear the load for the container force, and the container system takes on the load, so that parts can be easily This is intended to reduce the number of points and weight.

Embodiments of the present invention will be described in detail below with reference to FIGS. 2 to 6.

In the embodiment, an intermediate frame type indirect extrusion press and a single-acting type are illustrated, but the present invention can be applied to other indirect extrusion presses, and a double-acting type may also be used.

In FIG. 2 showing the initial position, during pressing, a press platen 1 having a through hole 1A and a main cylinder frame 2 are arranged in correspondence with each other in the front and back, and both 1, 2
are firmly connected by tie rods 3 arranged diagonally in the upper, lower, left, and right directions, and the press frame structure has a rigid frame structure as shown by reference numeral A.

A main cylinder 4 is provided at the press center of the main cylinder frame 2, and a main ram 5 is fitted into the main cylinder 4 to constitute a pushing force generating device.

A pressurizing stem 21 is protruded from the main ram 5 toward the front (the term "forward" refers to the press direction, and the term "rear" refers to the opposite direction) from the center of the press via the crosshead 6.

A side cylinder 7 is attached to the main cylinder frame 2, and a piston 8 fitted into the cylinder 7 is connected to a crosshead 6, so that the pressurizing stem 21 can move forward without any load.

A die stem support device 31 is provided on the rear end surface of the press platen 1.
is provided, and the die stem 24 is connected via this support device 31.
The front end (base) of the die stem 24 can be fixed at the center of the press, and of course the die stem 24 can be fixed and changed in position between the center of the press and the outside of the press.

The die stem 24 is an elongated cylindrical body, and the die 23 is attached to the rear thereof via a die holder 22.

The container 20 has a billet receiving hole at the center of the press, and a container moving device and a hydraulic compressing device are connected to the container holder 19, and together they form a container system as shown by reference numeral B.

That is, inside the press frame structure A, the container moving cylinders 1 are disposed diagonally on the press platen 1 in the upper, lower, left, and right directions.
1 and fix the piston 12 in the container holder 1.
It is connected to 9.

On the other hand, the hydraulic coupling cylinder 9 is fixed to the crosshead 6 in a diagonal arrangement in the upper, lower, left and right directions, and its piston 10
is connected to the container holder 19.

The intermediate frame 13 is fitted onto the die stem 24 via a guide ring 25 etc., and is freely movable forward and backward along the longitudinal direction of the die stem 24 via a cylinder 14 provided on the press platen 14 and a piston 15 fitted thereto. .

This intermediate frame 13 includes a cylinder 16 and a piston 17.
A vertical shear device including a shear 18 and the like is provided.

The movable members such as the crosshead 6 and the container holder 19 are slidably guided by a guide device not shown.

The extrusion operation will be explained with reference to FIGS. 3 to 6. FIG. 3 shows charging the billet 27 into the accommodation hole of the container 20 through the movement (advancement) of the billet loader 26 and the container 20. In short, after the billet 27 is charged into the container 20 by an appropriate means, extrusion is started.

That is, after storing the billet in a container, the billet loader 26 is rotated outside the press, pressure oil is sent to the forward side of the side cylinder 7, the main ram 5 is advanced without load, and the end face of the pressurizing stem 21 and Dummy block 29 between die 23
The billet 21 is sandwiched between the two and the preparation position is taken here.

Therefore, the forward side of the side cylinder 7 and the main cylinder 4
The main ram 5 is moved forward again by supplying pressure oil to the main ram 5, the billet 27 in the container 20 is upset, and the billet 27 is filled up in the container 20, so that a frictional force is generated between the container 20 and the billet 27.

Next, the container moving cylinder 11, the side cylinder 7,
When pressurized oil is sent to each advancing side of the main cylinder 4, the container 20 and the pressurizing stem 21 move forward at the same time, and the billet 27 is moved to the die 23 of the die stem 24 while the container 20 is prevented from moving relative to the main ram 5. It is extruded through the

In this case, if the pump discharge rate is adjusted so that the moving speed of the container moving cylinder 11 is equal to or greater than the moving speed of the main ram 5, pressure oil is not being sent to the hydraulic compressing cylinder 9. The container moving force is added to the extrusion force via the billet 21, and the friction force between the billet 27 and the container 20 causes the stem 21 to
synchronize with the movement of

Furthermore, when pressure oil is fed to the hydraulic coupling cylinder 9, this cylinder 9 is provided in the crosshead 6 and its piston 10 is connected to the container holder 19, so the amount of container movement force is applied during extrusion. It is added to the moving force of the main ram, that is, the pushing force, through the pressure stem 21, and FIG. 4 shows the state in which pressure oil is being fed from each port a, b, and c.

Here, in order to connect the main ram 5 and the container 20 at an arbitrary position depending on the billet length using the static friction force between the container 20 and the billet 27, the timing of increasing the pressure of the hydraulic coupling cylinder 9 is adjusted. becomes important.

This pressure increase timing occurs after the billet is finished upsetting, when the friction between the container 20 and the billet 27 becomes stronger than the coupling cylinder 9 and the container moving cylinder 11, and when the extrusion progresses and the length of the billet 27 becomes shorter. It is sufficient that the period is just before the friction becomes smaller than the force of both cylinders 9 and 11.

Pressure oil is sent to the coupling cylinder 9 so that the relative positions of the container 20 and the pressurizing stem 21 (crosshead) are coupled, and thereafter, during the entire extrusion stroke, the container moving force is transferred to the pressurizing stem via the hydraulic coupling cylinder 9. It is added to the extrusion force while maintaining the relative position of the container.

Container 20 while being pressurized and coupled.
The space between the crosshead and the crosshead is fixed, and a rigid frame structure "C" shown in FIG. 4 is formed to improve the precision of movement.

During extrusion, the amount of container movement force is added to the amount of extrusion force by the main cylinder 4 and side cylinder 7, but the extrusion strength of the main cylinder 4 and side cylinder 7 is received by the rigid-frame groove part of the press frame structure A. The extrusion strength of the container moving cylinder 11 is borne by the container system B, and even though the full force of the press is small, the structure of the press frame structure A remains unchanged and the extruded material 28 is
extrusion molding.

After the extrusion is completed, the container 20 is moved backward (to the left) as shown in FIG. 5, and the accommodation hole of the container 20 is scalped through the dummy block 29, and the receiving hole of the container 20 is scalped through a suitable shearing device as shown in FIG. One press cycle is now completed by cutting the discard 30 and the extruded material 28 and returning each member to its original position.

The function of the hydraulic cup cylinder 9 will be explained once again.

Oil is supplied from port a to container 2 after the upset is completed.
0 and the billet 27 is greater than the force of the compacting cylinder 9 and the container moving cylinder 11 (if this happens, the circuit will be blocked and the pressure oil will be confined in the cylinder).

The timing for blocking the circuit is determined by detecting by a pressure switch (not shown) that the pressure of the pressure oil supplied to the main ram 5 has risen to a preset pressure.

As a result, the amount of force generated in the container moving cylinder 11 during the entire suppression stroke is changed from its piston 12 → container holder 19 → piston 10 of the hydraulic coupling cylinder 9 →
Pressure oil confined in the cylinder 9 → cylinder 9 → crosshead 6 → force is added to the amount of pressing force while maintaining the relative position of the pressurizing stem 21 and the container 20 via the pressure stem 21.

As mentioned above, pressure oil is supplied from the pump to the container moving cylinder 11 so that the speed of the container moving cylinder 11 is faster than the main ram speed, but the force generated by the cylinder 11Ω is not enough to push out the product. Can not.

The hydraulic pressure inside the container is always the maximum and constant.The amount of force is constant, therefore, the hydraulic pressure inside the hydraulic compressing cylinder 9 is constant.If the hydraulic pressure inside the hydraulic compressing cylinder 9 changes, it will change due to the compressibility of the oil. Same cylinder 9 and same piston 1
Although the relative position of 0 will change, the pressure inside the cylinder 9 will change! Relative position as long as it is fixed.

Therefore, the oil supplied into the container moving cylinder 11 moves forward following the main ram speed while being relieved by the relief valve, and the force of the container moving cylinder 11 is applied to the pressurizing stem 21.

Also, the billet 27 is extruded and shortened, and the billet 2
Even if the friction between the container 7 and the inner surface of the container 20 is reduced, the container cannot be pushed out by the container moving cylinder 11 alone, so the pressure inside the coupling cylinder 9 remains constant in proportion to the force generated by the container moving cylinder 11.
0 and the pressurizing stem 21 will not deviate from each other.

The present invention arranges a press platen 1 and a main cylinder frame 2 facing each other in the front and back, and connects both 1 and 2 with a plurality of tie rods.
The die stem 24 is fixed at the center of the press of the plain platen 1, and the container 20 and pressurizing stem 21 move to move the billet 27 inside the container 20 to the die stem 24. An indirect extrusion press that performs indirect extrusion through an attached die 23, fixes the relative position of a container 20 and a pressurizing stem 21 during extrusion, and applies an extrusion force via the pressurizing stem 21 based on the container moving force. A plurality of hydraulic cylinders 11 for moving the container 20 are arranged on the platen 1,
A container system B is constructed by attaching a plurality of hydraulic coupling cylinders 9 to the crosshead 6, and coupling the pistons 12 and 10 of the container moving cylinder 11 and compiling cylinder 9 to a container holder 19, respectively. Since it is related to an indirect extrusion press, it has the following advantages.

Container 20 and pressure stem 21 or container holder 19 and crosshead 6 depending on the length of billet 27
The concatenation of can be performed at any relative position.

The effective extrusion force can be increased by adding the container moving force to the extrusion force, and while the two are coupled, a rigid frame structure is formed between the crosshead 6 and the container holder 19 shown in Fig. 4, and indirect extrusion is possible. In order to ensure the necessary advantages such as the most important movable precision being increased, based on the construction of the container system B by the container moving cylinder 11, the hydraulic coupling 9 and the container 20, the main components, that is, the press frame The yield strength of the body A has advantages such as simplifying the equipment mechanism, reducing the number of parts, and thereby reducing the weight without considering the container cylinder force.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional elevation view of a conventional indirect extrusion press;
6 to 6 show an example of the present invention, FIG. 2 is a cross-sectional elevation view of the initial position, FIG. 3 is a cross-sectional elevation view of the billet charge, FIG. 4 is a cross-sectional elevation view during extrusion, and FIG. Figure 5 is a cross-sectional elevation view of the container skull pink, and Figure 6 is a cross-sectional elevation view when cutting the discard. 1...Press platen, 2...Main cylinder frame, 3...Tie rod, 4...
...Main cylinder, 5...Main ram, 6...
Zoros head, 9...Hydraulic compression cylinder, 10...Hydraulic compression piston, 11
...Container moving cylinder, 1200. ...
Container moving piston, 19...Curved container holder, 2
0... Container, 24... Die stem, A... Press frame, B... Container system.

Claims (1)

[Claims] 1. A press platen 1 and a main cylinder frame 2 are arranged to face each other in the front and back, and both 1 and 2 are connected by a plurality of tie rods 3 to form a press frame A having a rigid frame structure. The die stem 24 is fixed, and the container 20 and pressurizing stem 21 are movable to indirectly extrude the billet 27 in the container 20 through the die 23 attached to the die stem 24.
This is an indirect extrusion press in which the relative positions of the pressure stem 21 and the pressure stem 21 are fixed, and the amount of force for moving the container is added to the extrusion force via the pressure stem 21. It is arranged on the platen 1, a plurality of hydraulic horn ring cylinders 9 are attached to the crosshead 6, and each piston 12, 10 of the container moving cylinder 11 and the coupling cylinder 7 is coupled to the container holder 19, respectively. An indirect extrusion press characterized by comprising a container system B.