JPH0137767Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention uses an auxiliary perforation cylinder in combination with an extrusion press equipped with billet perforation means using a mandrel in order to extrude and form a hollow extruded material from a solid billet. In particular, the present invention relates to an improved method that allows the perforation contents of a longer billet to be easily obtained.

(Prior art) A solid billet is used as an extrusion material, and after a hole is made in the center using a mandrel, the billet is extruded through an annular gap formed between the mandrel and a die using an extrusion press. A double-acting extrusion press for obtaining a hollow tubular extruded product by extrusion is well known, and its main structure is as follows. What is shown in Figures 1, 2, and 3 is an indirect extrusion press as one of the embodiments of the present invention. In the connected main cylinder 1 and press platen 11, at the front end of the main ram 2, which can be pressurized back and forth by the main cylinder 1,
A main crosshead 5 with an extruded stem 7 is provided via a side cylinder 14, and a perforating cylinder 3 for piercing is provided inside the main ram 2.
A perforating ram 4 that can be pressurized back and forth freely by the cylinder 3
Connect the mandrel holder 6 to the tail rod 15 through
At the same time, a mandrel 8 is provided concentrically at the tip of the mandrel holder 6, which extends through the main cylinder 1, the main ram 2, and the crosshead 5 so as to be freely retractable. A die stem 23 with a die 28 is provided, and the container 9 is moved through a container moving cylinder 12 provided on the platen 11.
A container holder 10 for holding a container is provided to move forward and backward, and a hydro coupling cylinder 2 is installed on the main crosshead 5 side for indirect extrusion press.
2 is provided, and the cylinder 22 and each rod of the container moving cylinder 12 are connected. The direct extrusion press has a different die structure except for the hydrocoupling cylinder 22, and the direct and intermediate extrusion presses have substantially the same structure except for the die mounting structure.

FIG. 1 shows the billet supply state, in which a solid billet 25 is carried onto the press center line by a billet loader (not shown) at an intermediate position between the extrusion press 7 and the container 9, which are in the retracted position, and then As shown in FIG. 2, the container 9 moves forward via the container holder 10 and the billet 25
is loaded, the main ram 2 moves forward slightly and presses the rear end of the billet 25 via the push plate 27, and the billet 25
The front end of the die stem 23 is connected and supported, and the mandrel 8 is inserted under pressure into the center of the billet through the advancement of the punching ram 4 in the punching cylinder 3.
A piercing corresponding to the diameter of the mandrel 8 is obtained at the center of the billet 25. After this piercing, the extrusion press 7 is advanced by the main ram 2, and the container 9 is also advanced by the container holder 10, so that a billet 25 is formed between the tip of the mandrel and the die 28, as shown in FIG. A tubular extruded product 26 is obtained by extrusion through the annular gap.

(Problems to be Solved by the Invention) In the above-described double-acting extrusion press for extruding hollow materials, the punching cylinder 3 is a driving member for the mandrel 8 that punches the billet 25 of the solid material.
As is clear from the drawings, the main ram 2 for extrusion is usually formed as an integral part of the main ram 2. As is known, the main ram 2 receives external pressure during extrusion, so
The inner diameter of the main ram is limited by its strength. Therefore, the perforation cylinder 3 built into the main ram 2 naturally has the same capacity (diameter) as the main ram.
will be further restricted by For this reason, the length of the perforated billet is also limited, and current press machines can only perforate relatively short billets. In the case of extrusion, the length of the billet is limited by the perforation ability, so there are problems in that it cannot take advantage of its features.

(Means for Solving the Problems) In order to solve the above problems, the present invention adds an auxiliary perforation cylinder separately in addition to the conventional perforation cylinder built into the main ram, and uses both together. This increases the perforation ability and makes it possible to perforate long billets.Specifically, after performing the perforation process of a solid billet with a mandrel, it is possible to form a solid billet with the mandrel and die. In a double-acting extrusion press that extrudes a hollow material through an annular gap using an extrusion stem, it is possible to perforate solid billets by providing an auxiliary perforation cylinder outside the main cylinder, which is separate from the perforation cylinder built into the main ram. During the process, the ability of an auxiliary drilling cylinder is added to the ability of the drilling cylinder to perform drilling, and the auxiliary drilling cylinder is further provided with a piercer locking means.

(Function) According to the technical means of the present invention, a double-acting extrusion (indirect extrusion) press of the type in which a perforated cylinder 3 of a mandrel 8 is installed inside the main ram 2, as shown in FIGS. , an auxiliary perforation cylinder 19 is installed outside the main cylinder 1 in parallel with the perforation cylinder 3, and the piston rod 1 of the auxiliary perforation cylinder 19 is
9a end and tail rod 15 of mandrel holder 6
The two ends are integrally connected by a mandrel crosshead 17, which is a common connecting member, thereby making it possible to drill long billets by increasing the drilling capacity as described below. That is, in the feeding state of the billet 25 shown in FIG.
As well as the drilling ram 4 in the main drilling cylinder 3, the piston rod 19 of the auxiliary drilling cylinder 19
a is also in the retracted position, but in the piercing state shown in FIG. Since the power of the auxiliary drilling cylinder 19 is added to the drilling power of the cylinder 3, the drilling capacity can be increased compared to when only the drilling cylinder 3 is used, thereby making it possible to drill longer billets. . The tensile force of the mandrel 8 due to the frictional force between the billet 25 and the mandrel 8 during extrusion by the extrusion stem 7 against the billet 25 after perforation shown in FIG. 3 is supported by the stroke end of the auxiliary perforation cylinder 19. The retreating force of the mandrel 8 due to the back pressure on the billet 25 side acting on the tip of the mandrel is supported by supplying fluid pressure (hydraulic pressure) to the rod side of the piston rod 19a of the auxiliary drilling cylinder 19.

(Embodiments) Various embodiments of the present invention will be sequentially explained with reference to FIGS. 1 to 13.

The embodiment shown in FIGS. 1 to 3 is an application of the present invention to an indirect extrusion press, and in addition to the structure described in the prior art section, auxiliary perforations are provided as shown in the figures. The cylinder 19 is installed at the rear of the main cylinder 1. The piston rod 19a of the cylinder 19 and the tail rod 15 of the mandrel 8 are connected to the mandrel crosshead 17.
However, in the embodiment, the crosshead 17 is also slidably installed by a fixed guide frame (not shown), similarly to the container holder 10 and the crosshead 5.

The embodiments shown in FIGS. 4 to 6 show the application of the present invention to a direct extrusion press. In this case, for direct extrusion, the container holder 10 holding the container 9 is connected to the container moving cylinder 12.
The only difference is that, instead of the die stem 23 in the indirect extrusion press, a known die stack 24 such as a direct die, a die backer, etc. is installed on the press platen 11, and the rest are the same as indicated by the same reference numerals. FIG. 4 shows the feeding state of the billet 25, and FIG. 5 shows the drilling state, after loading the billet 25 into the container 9 by the extrusion stem 7, the mandrel 8 After drilling by the force of both the main drilling cylinder 3 and the auxiliary drilling cylinder 19, the billet 2 is
5 through the annular gap between the tip of the mandrel 8 and the die 28 in the die stack 24, as shown in FIG. 6, a tubular extruded product 26 is obtained by direct extrusion. It is. At this time, the mandrel locking against the tensile force of the mandrel 8 during extrusion and the retreating force of the mandrel 8 at the end of extrusion is performed first.
The locking means for the mandrel 8 is a known locking means used in conventional direct and indirect extrusion presses, although it is not shown in the drawings. It goes without saying that the same effect can be achieved even if .

The embodiments shown in FIGS. 7 to 12 are as follows:
The present invention is applied to a direct and intermediate extrusion press, and Figures 7 to 9 show the case of indirect extrusion method, and Figures 10 to 12 show the case of direct extrusion method. There is. In such a direct and intermediate extrusion press, as is known, a die attachment part 31 is provided at the front of the press platen 11, and a die stem 23 and a die stem 23 for indirect extrusion shown in FIG. 7 are attached to the attachment part from the side of the press. Since any of the die stacks 24 for direct extrusion shown in FIG. 10 can be exchanged by using a moving means, etc., in the case of indirect extrusion, a die stem 23 equipped with a die 28 is attached to the mounting part 31 as shown in FIG. 7. In the case of direct extrusion, a die stack 24 equipped with a die 28 is set in the mounting part 31 as shown in FIG. 10, and in the case of indirect extrusion, as shown in the embodiments of FIGS. 1 to 3. Auxiliary drilling cylinder 1
9 is short enough, but in the case of direct extrusion, the required stroke becomes longer as shown in the embodiments of FIGS. 4 to 6. To deal with this, the strokes shown in FIGS. 7 to 12 are In the embodiment shown, the auxiliary perforating cylinder 19 is provided with piercer locking means so that the auxiliary perforating cylinder 19 has a short stroke and can be used both for direct and intermediate purposes. That is, as shown in FIG. 7, a stopper 16a (for indirect extrusion) and a stopper 1 made of nuts or the like are attached to the tail rod 15 of the mandrel 8 in two stages, front and rear.
6b (for direct extrusion), and the stopper 16a,
A mandrel stopper frame 21, which is equipped with a stopper plate 20 that can be freely engaged and disengaged by advancing and retracting, rotating, etc., is held by the piston rod 19a of the auxiliary perforation cylinder 19 attached to the main cylinder 1. Guide bar 3 fixed to cylinder 1
2 and 32, the stopper frame 21 is provided so as to be movable forward and backward in the direction of the press axis. According to this embodiment, FIGS. 7 to 9 sequentially show a billet supply state, a billet perforation state, and a perforated billet extrusion state by indirect extrusion. The process is carried out in the same manner as above, but at the start, as shown in FIG. The only difference is that the movement is performed while being locked to the front and rear stoppers 16a, and all processes from billet supply to billet drilling and billet extrusion are performed in the locked state. 10 to 12 sequentially show the billet supply state, the billet perforation state, and the perforated billet extrusion state by direct extrusion. At the start, that is, when the billet 25 is being supplied, the mandrel stopper plate 20 in the mandrel stopper frame 21 is moved to the 10th position.
As shown in the figure, start the evacuation state from the front and rear stoppers 16a, and as shown in Fig. 11,
Extrusion stem 7 through main ram 2 main crosshead 5
moves forward and loads the billet 25 into the container 9 of the container holder 10 which is connected to the die staff 24, and the stem 7 is attached to the rear end of the billet 25 by the press plate 2.
7, the tip of the mandrel 8 that accompanies it also moves while maintaining its relative position with the front end of the stem 7 shown in FIG. Since the end stopper 16b moves to the position of the front and rear stopper 16a shown in FIG.
0 to engage with the stopper 16b. Therefore, when drilling the billet 25 by pressurizing and advancing the mandrel 8 by the main drilling cylinder 3, which starts next, the force of the drilling cylinder 3 is combined with the force of the auxiliary drilling cylinder 19. The ability of
Other than this, the process is exactly the same as the direct extrusion shown in FIGS. 4 to 6. However, although not shown in the drawings, it is also possible to leave the stroke of the auxiliary perforation cylinder 19 as a long stroke due to direct extrusion, and conversely, use a piercer locking means using another mandrel stopper method during indirect extrusion. The content is not limited to illustrations only. Also, as a modified example of this example,
When drilling the billet 25 loaded in the container 9, the first half of the drilling is performed only by the main drilling cylinder 3, and from the middle, the stopper 16 at the tail rod 15 is formed by mandrel locking.
It is also easily possible to perform the second half of the drilling by adding the force of the auxiliary drilling cylinder 19 to the force of the cylinder 3 by locking.

All of the embodiments described above belong to tail rod type double-acting extrusion presses, but the present invention can also be applied to other types than tail rod types, and one embodiment thereof will be explained with reference to FIG. . That is, the embodiment shown in FIG. 13 is a known internal piercer type indirect extrusion press, and in this type of press, the main cylinder 1 is
and a press platen 11 are integrally connected, a main crosshead 5 having a notch 33 in the center is provided at the front end of a main ram 2 which can move forward and backward under pressure in the main cylinder 1, and an extrusion stem 7 is provided in the main crosshead 5. At the same time, a mandrel 8, which is inserted concentrically into the extrusion stem 7, holds the mandrel holder 6 through a mandrel crosshead 17, which is provided integrally with the perforation ram 4, which is movable under pressure in the perforation cylinder 3 formed within the main ram 2. A side piston 34 provided on the side of the crosshead 5 is inserted into the mandrel retraction cylinder 18 provided on the mandrel crosshead 17, and the other press platen 11 is provided with a die 28 at its tip. A die stem 23 is provided, and a container 9 container holder 10 is held in a container moving cylinder 12 provided on the press platen 11 side, and a hydro coupling cylinder 22 provided on the rod of the moving cylinder 12 and the main crosshead 5 side.
In the case shown in the figure, a solid billet 25 is connected to a container 9.
However, in the present invention, even in this type of indirect extrusion press, an auxiliary perforation cylinder 19 is provided on the side of the main cylinder 1 as shown in the figure, and the cylinder 19
By connecting the piston rod 19a to the mandrel crosshead 17 side, the force of the auxiliary drilling cylinder 19 is added to the force of the main drilling cylinder 3 during drilling, and the drilling capacity is increased, without being different from the tail rod type. It can be increased.

(Effects of the invention) According to the invention, in an extrusion press of the type in which a cylinder for billet perforation is provided inside the main ram,
The main ram is limited in strength, and the drilling cylinder is limited in its drilling ability (power), so it can only drill relatively short billets. This is advantageous in that it can be reliably solved by providing a separate cylinder and cooperating with the main perforation cylinder. It is clear that this makes it possible to drill long billets, thereby significantly improving the material yield. Especially in the case of indirect extrusion presses, even though long billets can be used, the drilling capacity is insufficient. Therefore, when obtaining tubular extruded products, the disadvantage of only using short billets can be eliminated and the original features can be maximized, and the auxiliary perforated cylinder can be easily installed using the outside of the main cylinder. It is useful as an extrusion press having a large punching capacity.

[Brief explanation of the drawing]

Figures 1 to 3 are vertical sectional front views showing the billet feeding, perforation, and extrusion states of the embodiment of the present invention using an indirect extrusion press, and Figures 4 to 6 are the same of the embodiment of the invention using a direct extrusion press. billet supply,
Vertical front views of perforation and extrusion states, Figures 7 to 1
Figure 2 is a longitudinal sectional front view of the embodiment of the present invention using a direct and intermediate extrusion press in the billet supply, perforation, and extrusion states, and Figure 13 is the billet supply of the embodiment of the present invention using an internal piercer type indirect extrusion press. It is a vertical front view of a state. DESCRIPTION OF SYMBOLS 1...Main cylinder, 2...Main ram, 3...Drilling cylinder, 4...Drilling ram, 5...Main crosshead, 6...Mandrel holder, 7...Extrusion stem, 8...Mandrel, 9... Container, 10...
... Container holder, 11 ... Press platen, 1
2... Container moving cylinder, 15... Tail rod, 16a, 16b... Mandrel stopper,
17... Mandrel cross head, 19... Auxiliary drilling cylinder, 20... Mandrel stopper plate, 21... Mandrel stopper frame, 2
3... Die stem, 24... Die staff, 25
...Bilet, 28...Die.

Claims (1)

[Claims for Utility Model Registration] 1. In a double-acting extrusion press that, after performing a drilling process on a solid billet using a mandrel, extrudes a hollow material using an extrusion stem through an annular gap formed by the mandrel and a die. By providing an auxiliary drilling cylinder outside the main cylinder that is separate from the drilling cylinder incorporated inside the main ram, during the drilling process of a solid billet, the ability of the auxiliary drilling cylinder is added to the capacity of the drilling cylinder to perform drilling. An extrusion press with an auxiliary perforation cylinder characterized by: 2. The extrusion press described in Claim 1 of the Utility Model Registration Claim, in which the auxiliary perforation cylinder is equipped with a piercer locking means.