JP2509693Y2 - Free dies for indirect extrusion press - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention relates to an indirect extrusion press,
In particular, by adopting a seal ring that cleans the inner surface of the container on the outer surface of the free die, the container shell removed during extrusion is removed, and the seal ring that was cleaned at the tip of the die stem is refitted on the die, The present invention relates to a free die for an indirect extrusion press that enables continuous reuse of the same die.

[0002]

2. Description of the Related Art In indirect extrusion of aluminum alloy, in order to ensure surface quality, it is essential to remove the container shell attached to the inner surface of the container after extrusion. Conventionally, the means shown in FIGS. 6 and 7 has been used as such shell removing means on the inner surface of the container. FIG. 5 is a front view of the extrusion press as a whole, FIG. 6 is a sectional view of a main portion in which a free die is arranged at the tip of the die stem, and FIG. 7 is a sectional view of a main portion in which a fix die is mounted at the tip of the die stem.

In FIG. 5, reference numeral 21 is a main cylinder mounted on a fixed plate 22, 23 is a main ram slidably mounted on the main cylinder 21, and 20 is a main ram 2.
The moving frame 20 is slid on a guide (not shown). The main ram 23 is for moving the moving frame 20 forward, and for moving the moving frame 20 backward, the cylinder 25 is fixed to the fixed platen 22, and the cylinder 25
Is fixed to a part of the moving frame 20.
A piercer crosshead 27 is provided so as to be slidable in the axial direction.
It was mounted on a pier salam 28 slidably mounted therein. The piercer ram 28 is a ram for moving the piercer cross head 27 forward. A retraction cylinder (not shown) is attached to the piercer cross head 27.

Reference numeral 8a is a cylindrical extruding stem attached to the tip of the moving frame 20, and 5 is a mandrel slidably provided in the extruding stem 8a, which has a tip portion 5a at the tip. The mandrel 5 is fastened to the mandrel holder 6 with a screw, and the mandrel holder 6 is rotated by the worm mechanism 7 or a screw between the mandrel 5 and the mandrel holder 6 is tightened. The mandrel 5 and the mandrel holder 6 are held by the main crosshead 8, and the mandrel 5 and the main crosshead 8 are reciprocated by separate hydraulic mechanisms.

As shown in FIG. 5, the container holder 1 is movably mounted in a horizontal axial direction by a hydraulic silling 4 at a position opposed to a die 3c provided in contact with the end platen 2, and the container 1a is provided therein. Has
The billet 10 is stored in the container 1a. on the other hand,
A billet loader 9 is installed at an intermediate position between the container holder 1 and the main crosshead 8, and a mandrel changing device is also arranged at the position of the billet loader 9. Further, a die stem 11 protruding toward the opposite extruding side of the end platen 2 is provided coaxially with the extruding stem 8a.

When the billet 10 is extruded, the die stem 1
A die 3 is provided at the free tip of the billet 1, and the billet 10 is extruded through the die 3. by the way,
There are the following two methods for arranging the die 3 on the front surface of the die stem 11. That is, one is shown in FIG.
The integrated free die 3c shown in FIG. 7 is the fixed die 3d shown in FIG. Fix dice 3d
In this case, the die stem 11 is configured to be easily attached and detached by the bayonet method. Further, a seal ring 12, which will be described later, is fitted on the outer periphery of the die 3d so that it can be inserted and removed in the extrusion direction.

The operation of such an indirect extrusion press will be described using a free die. First, container 1a
Is advanced to contact the die 3c. Then, the billet 10 is placed on a billet loader (not shown), and the billet loader is moved to move the cylindrical billet 1 into the container 1a.
0 is loaded, the main ram 23 is advanced to the right, and the tip of the extrusion stem 8a is brought into contact with the free dummy block. Next, the pier salam 28 is operated to move the mandrel 5 forward so that the billet 10 is inserted, and the tip portion 5a of the mandrel 5 is fixed to the center position of the product extruding portion of the die 3c. Subsequently, the main ram 23 is advanced again to advance the extrusion stem 8a, and the container 1a is also advanced to press the billet 10 to extrude a tube as a product from the die 3c. After the extruding of the billet 10 is completed, the mandrel 5 is retracted by operating the pier salam 28, and then the extruding stem 8 is operated by operating the main ram 23.
Retreat a. Subsequently, a container moving cylinder (not shown) is operated to separate the container 1a from the die 3c. Next, the cutting device is operated and the cutting blade is lowered to cut the extrusion pipe 14 and the discard to complete a series of operations.

[0008]

However, when the die 3 is an integrated free die 3c, the die 3 having the same shape is used.
In this case, the thickness of the extruded tube 14 is not affected by the core accuracy of the die stem 11, but the die cost is increased. It is difficult to produce the same dice without deviation. Further, there is a fixed die 3d in which the die 3 is attached to the tip of the die stem 11 and a seal ring 12 described later is fitted on the outer peripheral surface of the die 3d, but the die stem 11 and the die 3d are formed by a bionet system. Because of being fixed, the wall thickness accuracy of the extrusion tube 14 is affected by the core accuracy of the die stem 11. Further, when the die 3 is being serviced or the die 3 is to be replaced, it is necessary to move the die slide on which the die 3 is placed to move the die stem 11 out of the center of the press to the outside of the press machine. There was a problem that it had to be interrupted.

In the present invention, focusing on the above conventional problems, the inner surface of the container 1a is cleaned as a die assembly 13 in which the integrated die 3c is separated into the die 3c and the seal ring 12 and is detachably fitted. An object of the present invention is to provide a free die 3c in which the work of removing the shell attached to the seal ring 12 does not affect the press cycle and is not affected by the core accuracy of the die stem 11.

[0010]

In order to achieve the above object, in the present invention, a die stem located on the front surface of a fixed platen and an indirect extrusion press for extruding a product positioned between the die stem and the billet at the time of billet extrusion. In the free die, the free die has a small diameter portion smaller than the outer diameter of the die stem, and a seal ring for cleaning the inner surface of the container is fitted on the outer periphery of the small diameter portion so as to be insertable and removable in the axial direction of the press. A part of the seal ring is tapered so that the diameter is reduced from the die stem side toward the container.

[0011]

[Function] As a die assembly in which a seal ring for removing the container shell is fitted on the outer peripheral surface of a free die having a diameter smaller than that of the die stem, the die assembly is arranged at the front end portion of the die stem, and is inserted into the container by advancing the extrusion stem. Extrude the billet. After the extrusion is completed, move the die unloader device from outside the press machine to the press position to clamp and retract the die assembly with the shell attached, and replace only the seal ring from the die to move the die assembly to the center of the press. Continue to reuse the press again.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of a free die for an indirect extrusion press according to the present invention will be described in detail below with reference to the drawings. 1 is a cross-sectional view of the main part near the tip of the die stem, FIG. 2 is a front view of FIG. 1 viewed from II-II, FIG. 3 is a cross-sectional view of the tip of the die stem showing a billet extruded state, and FIG. 4 is an explanatory view showing the extruded state. is there.

Since the structure of the whole indirect extrusion press is the same as the conventional structure shown in FIG. 5, its detailed description is omitted.
1 to 3, only the part related to the present invention will be described below. In the figure, the container 1a indicated by the chain double-dashed line
However, like the known indirect extrusion press, it is reciprocally provided by the container holder 1 concentrically with the press axis and moves back and forth toward the die stem 11 supported on the front surface of the end platen 2. As shown in the figure, a seal ring 12 for cleaning the inner surface of the container 1a is provided at the tip of the die stem 11 on the outer peripheral portion of the outer diameter D ₀ of the free die 3c having a smaller diameter than the outer diameter D of the die stem 11. 3, and the rear end portion (on the die stem 11 side) of the free die 3c is taper-fitted with the seal ring 12 as shown in FIG. Further, a die chip 3d (the die 3c and the die chip 3d may be one body) that determines the shape of the extruded tube 14 and the outer diameter of the extruded tube 14 is fitted and arranged at the front end portion (the billet 10 side) of the free die 3c. , This free die 3c and seal ring 12
The die assembly 13 of the present invention is constituted by the above. When the billet 10 is extruded, the die assembly 13 is prevented from moving in the extruding direction by an auxiliary ring 15 attached to the tip of the die stem 11 by a bolt 16.

The seal ring 12 is used as a part of the die 3c by being fitted coaxially with the die 3c during the extrusion of the billet 10 to clean the inner surface of the container 1a.
The shell 17 generated on the inner surface of the container 1a can be removed. Normally, when the shell 17 attached to the seal ring 12 is once removed, by removing the seal ring 12 from the die 3c and fitting the seal ring 12 from which the shell 17 has already been attached to the die 3c, Two seal rings 12 are prepared for each die 3c so that they can be easily carried out during the press dry cycle time.

The seal ring 12 has a rear end outer diameter portion 31 which is in contact with the auxiliary ring 15 during extrusion of the billet 10.
(D ₁ ) and the front end outer diameter portion 30 (D ₂ ) on the side contacting the billet 10 side have D ₁ > D _2, and when inserted into the container 1 a having a constant diameter D, the free die Since the rear end portion 3c is expanded in diameter, the rear end outer diameter portion 31 of the seal ring 12 is also pressed outward. Therefore, the seal ring 1
2 by expanding the diameter of the container 1a (D) and the rear end outer diameter portion 31
_{(D 1)} between a gap of the _{(D-D 1 =) t} 0, between the container 1a (D) and the front end outer diameter _{(D 2) (D-D} 2
=) It becomes a state with a gap of t ₁ and has a relation of t ₁ > t ₀ .

In general, the t ₀ is set to be a minute size close to zero, and the t ₁ is larger than the height of the shell 17. The billet 10 loaded in the container 1a is moved forward by the extrusion stem 8a.
The billet 10 in the container 1a is extruded as an extruded tube 14 when it advances toward the die stem 11 fixed together with a. At this time, in the front end outer diameter portion 30 of the seal ring 12 located in front of the die stem 11, the shell 1
7 passes through without cleaning, and the rear end outer diameter portion 31
Then, the shell 17 is peeled from the inner wall surface 32 of the container and cleaned.

The separated shells 17 are constructed so as to be successively deposited in the space 33 formed between the front end outer diameter portion 30 and the rear end outer diameter portion 31 of the seal ring 12.

Explaining the extrusion cycle of the indirect extrusion press according to the present invention, FIG. 4 shows the extruded state described above. First, as in the conventional case, the billet 10 is placed in the container 1a.
After loading inside, the mandrel 5 is moved forward by operating the pier salum 28 (not shown), the billet 10 is inserted, and the tip part 5a of the mandrel 5 is fixed at the center position of the product extruding part of the die 3c. Subsequently, when the extruding stem 8a having the free dummy block 24 arranged at the tip is moved toward the die stem 11 as shown by the arrow, the billet 10 in the container 1a is extruded as the extruding tube 14 by the free die 3c, It passes through the inside of the die stem 11 and is discharged to the end platen 2 side. During this indirect extrusion, the shell 1 on the inner surface of the container 1a is sealed by the seal ring 12 located on the outer periphery of the free die 3c as shown in FIG.
7 is removed and the shell 17 is deposited in the space 33.

When the extrusion is completed, the discard (powder of the billet 10) is projected to the left toward the drawing of the container 1a as is known, and the discard is pushed forward by the known cutting blade advancement operation. Then, the extruding stem 8a is retracted in the direction opposite to the extruding direction of the billet 10 as shown by the arrow.

Next, as shown in FIG. 4, the container 1a
Moves slightly to the left toward the drawing, and the die assembly 1
3 is exposed to the outside of the right end of the container 1a, a die unloader device (not shown) is moved from a position outside the press to a press position, and a clamp provided in the die unloader device is positioned concentrically with the center axis of the press. The exposed die assembly 13 is securely and firmly gripped. After that, the die unloader device is retracted to the start position outside the press machine, the die assembly 13 is removed, and the container shell 17 attached to the seal ring 12 is newly removed during the operation of the extrusion press. After being fitted into the die 3c, it is placed on the die unloader device.

In this way, the removal of the container shell 17 and the necessary cleaning and maintenance are completed, and the die 3c and the seal ring 12 placed on the die unloader device are pressed from the start position outside the press machine. The billet is moved to the position and used for extruding a new billet 10.

[0022]

As is apparent from the above description, in the present invention, the die stem located on the front surface of the fixed platen and the indirect extrusion press which is located between the die stem and the billet when the billet is extruded are used. In the free die, the free die has a small diameter portion smaller than the outer diameter of the die stem, and a seal ring for cleaning the inner surface of the container is fitted on the outer periphery of the small diameter portion so as to be insertable and removable in the axial direction of the press. By partially tapering the diameter of the seal ring from the die stem side toward the container, continuous reuse of the same free die is possible, and the seal ring is
By preparing the two dies, the dies can be replaced and the dies can be quickly and easily maintained, so that continuous extrusion can be performed without interrupting the pressing operation. Further, there is almost no play in the portion where the die and the seal ring are fitted together, and because it is a free die, the accuracy of the thickness of the extruded tube is improved without being affected by the accuracy of the core of the die stem. Also, the diameter of the seal ring that accompanies the diameter of the free die can be expanded to reliably remove the container shell attached to the inner wall of the container.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part near a tip of a die stem according to the present invention.

FIG. 2 is a front view of FIG. 1 viewed from II-II.

FIG. 3 is a sectional view of a die stem tip portion showing a billet extruded state.

FIG. 4 is an explanatory diagram showing an extruded state.

FIG. 5 is a front view of the entire conventional extrusion press.

FIG. 6 is a cross-sectional view of a main part in which a free die is provided at the tip of a die stem.

FIG. 7 is a cross-sectional view of a main part in which a fix die is attached to a tip of a die stem.

[Explanation of symbols]

 1 container holder 1a container 1b container inner wall surface 3 die 3c free die 3d fix die 5 mandrel 5a mandrel tip 8a extrusion stem 9 billet loader 10 billet 11 die stem 12 seal ring 13 die assembly 14 extrusion pipe 17 shell 18 space part

Claims (1)

(57) [Scope of utility model registration request] 1. A die stem located on the front surface of a fixed platen, and a free die for an indirect extrusion press, which is located between the die stem and the billet at the time of billet extrusion to extrude a product, wherein the free die is smaller in diameter than the outer diameter of the die stem. A seal ring for cleaning the inner surface of the container is attached to the outer periphery of the small diameter portion so that it can be inserted and removed in the axial direction of the press, and the free die and a part of the seal ring are reduced in diameter from the die stem side toward the container. Free die for indirect extrusion press, characterized by the taper fitting.