JPH06269847A - Double acting type direct extruding method using clean out disk - Google Patents

Abstract

PURPOSE:To enable high cycling by stripping and removing a container shell using a clean out disk at the same time when a billet is extruded to shorten idle time. CONSTITUTION:A free dummy block 11 by which the billet is extruded remaining a shell in a container la and the clean out disk 12 having large and small diameter parts and by whose large diameter part the shell is stripped to be removed are positioned successively in the extruding direction. After piercing of billet is finished by a mandrel 5, the die is extruded while the mandrel is positioned on the same axial line to the container by the clean out disk and compressing and heaping 14a of shell is carried out in a space in which the shell is housed simultaneously when the extruding process is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-acting direct extrusion press, and more particularly to a container removed during extrusion by adopting a clean-out disc for cleaning the inner surface of the container between a free dummy block and an extrusion stem. The present invention relates to a double-acting direct extrusion method using a clean-out disc that enables the shell to be taken out in one step of the extrusion process together with a discard, a free dummy block, and a clean-out disc.

[0002]

2. Description of the Related Art In the direct extrusion of copper alloys, in order to secure the surface quality, it is essential to remove the container shell attached to the inner surface of the container after the extrusion. Conventionally, the removal of such a container shell has been performed by the following two methods. In the first method, the billet and the free dummy block are placed on the billet loader, and the advance of the extrusion stem causes the upset in the container via the free dummy block. After the upset is completed, the extrusion stem is moved forward again to perform extrusion molding of the desired extruded product from the die. This direct extrusion causes the inner wall surface of the container to stick to a shell with a certain thickness (referred to as container shell). Are formed sequentially.

After the extrusion is completed, the extruded product and the discard are cut by a cutting device, and the extrusion stem and the container are retracted while the discard is placed in the container. Next, a clean-out disc configured to be slidable on the inner wall surface of the container is placed on the billet loader located between the extruding stem and the container, and the clean-out disc is inserted into the container by advancing the extruding stem. The container shell was peeled off from the wall, compressed, and finally the discard, free dummy block, shell, and clean-out disk were extruded together outside the container and collected.

Further, in the second method, a clean-out disc having a shell accommodating space in series with the free dummy block on the head side of the extrusion stem to be joined to the free dummy block, and between the free dummy block and the free dummy block. (Or clean out ring) is fitted under an outer diameter that matches the inner diameter of the container, and the billet loaded into the container using the same extruding stem can be extruded directly through a die to create a free dummy. At the rear end of the billet that is extruded through the die by the block, the shell is successively formed in a sticky manner on the inner surface of the container by a free dummy block with an outer diameter that allows for a shell forming allowance in advance. A clean-out disc installed in series behind the dummy block also accompanies the extrusion stem and The outer diameter of the down-out disc is a compatible size and container inner diameter, the shell will be formed with extrusion proceeds the billet inner surface, it is removed by a clean-out disc. It is known that the billet is extruded and the container shell is removed at the same time by one step of such an extrusion process.

[0005]

However, in the first conventional method described above, the clean-out disc is used in order to remove the container shell formed in a sticky shape on the inner wall surface of the container during the billet extrusion step and the extrusion step. The extrusion stem had to be temporarily retracted by means of, and then re-advanced, which had the drawback of requiring a long time for one press cycle.

Further, in the second method, it is an essential requirement that the axis of the container and the axis of the extruding stem are coaxial. If both shafts are slightly eccentric, it will be difficult for the outer diameter side to match the container inner diameter even if the clean out ring inner diameter side is fitted to the stepped portion of the extrusion stem head. However, there is a drawback in that it takes a lot of time to adjust the shaft center in order to position the shaft center of and the shaft center of the extrusion stem on the same axis.

Further, although the product extruded from the conventional shell leaving extrusion die is suitable for the solid material,
Recently, it is necessary to use a double-acting direct extrusion press having a mandrel in order to stably produce an extruded tube having a high wall thickness precision which is particularly in demand recently. However, in the case of shell leaving extrusion, the outer diameter of the dummy block is generally smaller than the inner diameter of the container by, for example, 2 to 3 mm.
When the free dummy block is loaded into the container, it is eccentric and the free dummy block and the container cannot be positioned coaxially. If the mandrel pierces the billet through the free dummy block in this state, the tip of the mandrel located coaxially with the container will be guided by the free dummy block that is eccentric to the container, so piercing is completed. Sometimes
The axis of the die and the axis of the mandrel are not coaxial with each other, and there is a drawback that the extruded tube is uneven in thickness due to the influence of the positional accuracy of the mandrel and the thickness accuracy is lowered.

In the present invention, focusing on the above-mentioned conventional problems, the mandrel is positioned coaxially with the container by positioning the clean-out disc and the free dummy block coaxially with the container, and the mandrel of the mandrel being extruded while leaving the shell In addition to improving the core accuracy and obtaining an extruded tube with high wall thickness accuracy, a clean-out disc is used to remove the container shell at the same time as the billet extruding process to reduce the idle time and enable a high cycle cycle. It is an object to provide a dynamic direct extrusion method.

[0009]

In order to achieve the above object, in a double-acting direct extrusion method using a clean-out disc according to the present invention, a container that moves in an axial direction and an end platen on one end side of the container are provided. A die fixed to the shaft, an extrusion stem that moves axially to the other end, and a mandrel that makes relative movement in the extrusion stem are coaxially provided. It consists of a free dummy block and large and small diameter parts that are to be formed, and scrapes of the shell that occurs during billet pressure extrusion are positioned in the order of the clean-out disk that is performed at the large diameter part, and the extrusion stem is placed after the piercing of the billet is completed. Move and position the mandrel coaxially with the container using a clean-out disc Performs out, the free dummy block, container, also compression deposition of the shell in the shell housing space which is surrounded by a clean-out disk was performed at the same time.

[0010]

[Function] Since a clean-out disc that can slide in the container is provided and the free dummy block is engaged and held at the tip side of the clean-out disc, the free dummy block is held concentric with the container during the shell leaving extrusion. While moving forward, the thickness of the resulting container shell becomes uniform, and the axis of the mandrel is held coaxially with the axis of the container, while the clean-out disc peels off the container shell that is successively formed on the inner surface of the container in a sticky manner. To be done. Therefore, an extruded tube with high wall thickness accuracy can be easily obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of a double-acting direct extrusion method using a clean-out disc according to the present invention will be described in detail below with reference to the drawings. 1 is a longitudinal sectional view showing an extruded state according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing an extruded state of another embodiment similar to the present invention, and FIG. 3 is yet another similar to the present invention. FIG. 4 is a vertical sectional view showing the extruded state of the embodiment, FIG. 4 is a perspective view of the free dummy block and the cleanout disc of FIG. 3, and FIG. 5 is a sectional front view of the entire extrusion press for extruding using the cleanout disc. 17 to 17 are explanatory views showing a state where the container shell is simultaneously removed at the time of the extrusion process by using the clean-out disc. FIG. 6 is a front view showing the initial state position of the equipment before the start of extrusion, and FIG. 7 is a container. Fig. 8 is a front view showing the rise of the seal and billet loader. Fig. 8 is a front view showing the mandrel in a temporarily advanced state. 1 Front view showing a lowered state of the billet loader, FIG. 10 is a front view showing an upset state, FIG. 11 is a front view showing piercing of a billet, FIG. 12 is a front view showing extrusion of an extruded pipe by advancing an extrusion stem, FIG. Is a front view showing the retreat of the mandrel when the billet extrusion is completed, FIG. 14 is a front view showing the cutting of the extruded pipe by a cutting saw blade, FIG. 15 is a front view showing the conveying state of the extruded pipe, and FIG. 16 is a shell and discard. FIG. 17 is a front view showing a state where the free dummy block and the clean-out disc are taken out, and FIG. 17 is a front view showing a state before the start of extrusion.

First, the double-acting direct extrusion press used for obtaining the extruded tube while performing the remaining shell extrusion by the combination of the clean-out disc and the free dummy block according to the present invention will be described with reference to FIG.

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 movable frame 20 is a movable frame connected to No. 3, and the movable 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
The piston rod 26 of was fixed to a part of the moving frame 20.
Further, the piercer crosshead 27 is provided slidably in the axial direction, and the piercer crosshead 27 is attached to the piercer cylinder 29.
It was mounted on a pier salum 28 which was slidably mounted therein. The piercer ram 28 is a ram for advancing the piercer crosshead 27. The piercer cross head 27 is provided with a retracting cylinder (not shown).

Reference numeral 8a is a cylindrical extrusion stem attached to the tip of the moving frame 20, and reference numeral 5 is a mandrel slidably provided in the extrusion stem 8a. The mandrel 5 is fastened to the mandrel holder 6 with screws, and the mandrel holder 6 is rotated by the worm mechanism 7 or the screw between the mandrel 5 and the mandrel holder 6 is tightened. And
The mandrel 5 and the mandrel holder 6 are held by a 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 cylinder 4 at a position opposed to a die 3 provided in contact with the end platen 2, and a container 1a is provided therein. The billet 10 is stored in the container 1a. The die 3 is located between the end platen 2 and the container holder 1 and is reciprocally provided in the radial direction of the machine (direction orthogonal to the extrusion press direction of the billet 10).
0 is placed on. On this die slide 40, the die 3 provided at the extrusion press position and a discard receiver 41 at a position separated from each other are connected by a hook that can be easily released from the die, and the die slide 40 is moved when the billet 10 is extruded. Then, the die 3 is set to the extrusion press position, the extrusion of the billet 10 is completed, and after cutting with the cutting saw blade, the die slide 40 is moved to move to the discard receiver 41.
To the center position of the extrusion press and advance the extrusion stem 8a to move the discard 17, free dummy block 11,
The shell 14a and the cleanout disk 12 are provided so that they can be integrally transferred from the container 1a to the discard card receiver 41 side. On the other hand, a billet loader 9 is installed at an intermediate position between the container holder 1 and the main crosshead 8.
1 billet loader 9a and No. 1 It is composed of two billet loaders 9b. Reference numeral 11 indicates a free dummy block, and 18 indicates a cutting device.

Next, the relevant parts according to the present invention will be described with reference to FIGS. 1, 2, 3 and 4. For the extrusion molding of the billet 10 etc. made of copper and copper alloy system, the billet 10
In order to remove the oxide film generated by casting on the surface of the
The cleanout disk 12 is used. When the cleanout disc 12 is extruded, the billet 10 is located at the front end of the extruding stem 8a and is pressed by the free dummy block 11 located at the front end of the cleanout disc 12. ing.

The cleanout disk 12 of FIG.
Has an integral structure in which large and small-diameter cylinders are coaxially superposedly arranged and the outer shape is formed stepwise. The auxiliary ring 12b forming the small-diameter cylinder and the large-diameter cylinder It is composed of the main ring 12a. The outer diameter D ₁ of the main ring 12a is formed to be slightly smaller than the inner diameter D _{0 of the} container 1a so that the container shell 14 attached to the inner surface of the container 1a can be scraped off when the billet 10 is extruded. The size is small and nearly zero so that it can be inserted and removed in any direction. From this,
Since there is no looseness between the outer peripheral surface of the main ring 12a and the inner surface of the container 1a, the cleanout disk 1 cannot be removed when the cleanout disk 12 is inserted into the container 1a.
The tilt of 2 is naturally restricted, and the container 1a and the cleanout disk 12 are positioned coaxially. Further, the outer diameter D ₃ of the auxiliary ring 12b is set to the main ring 12a.
The outer diameter D _{1 is} smaller than the outer diameter D ₁ . In particular, when the container shell 14 is extruded leaving the container shell 14 at the time of extruding due to the configuration in which a gap (D ₀ -D ₄ ) of, for example, 2 mm is provided between the inner diameter D _{0 of the} container 1a and the outer diameter D ₄ of the free dummy block 11,
Shell 14a scraped off by the main ring 12a
Shell accommodating space portion 15 for sequentially accumulating and accommodating the free dummy block 11, auxiliary ring 12b, and main ring 12a
The container 1a and the container 1a are surrounded.

A central through hole 12c is formed in the central portion of the clean-out disc 12 in the axial direction of the press. In particular, the central through hole 12 of the auxiliary ring 12b
A fixed-length projecting guide portion 12d having a hole diameter slightly larger than the outer diameter D of the mandrel 5 is disposed in the c portion to hold the mandrel 5 in engagement and hold it. The container 1a and the mandrel 5 are coaxially positioned without eccentricity in cooperation with the main ring 12a slidably fitted in the loading hole of the billet 10.

On the other hand, a free dummy block 11 is provided at the front end of the auxiliary ring 12b of the clean-out disc 12 in the pushing direction, and a circle is formed at the rear end of the free dummy block 11 (on the side of the auxiliary ring 12b). The auxiliary ring 12b is formed with a concave portion 11a formed in a shape.
The outer diameter D ₃ is fitted into the recess 11a so as not to fall. Although the concave portion 11a has a circular shape in conformity with the cylindrical auxiliary ring 12b, the auxiliary ring 12b may have a polygonal shape such as a quadrangle or a pentagon.

A central through hole 11b, which is slightly larger than the outer diameter D of the mandrel 5, is formed in the center portion of the free dummy block 11 in the pressing axis direction. The gap between the guide portion 12d and the mandrel 5 is described above. Is almost the same as the above, and is formed to the extent that when the billet 10 is extruded, a part of the billet 10 does not enter the gap in a direction that is opposite to the extruding direction.

Next, another embodiment will be described with reference to FIGS. 2 and 3, the same parts as those in FIG. 1 will be omitted and only different parts will be described. FIG. 2 is a longitudinal sectional view showing an extruded state of another embodiment similar to the present invention. In FIG. 2, a central through hole 12c is formed in the central portion of the clean-out disc 12 in the press axial direction. In particular, the central through hole 12c of the main ring 12a is provided with a guide portion 12d of a constant length having a hole diameter slightly larger than the outer diameter D of the mandrel 5 to hold the mandrel 5 in engagement.
When piercing the billet 10, the main ring 12 is slidably fitted into the loading hole of the billet 10 of the container 1a.
While cooperating with a, the container 1a and the mandrel 5 are positioned coaxially without eccentricity. On the other hand, a free dummy block 11 is provided at the front end portion of the auxiliary ring 12b of the cleanout disk 12 in the extrusion direction.

FIG. 3 is a longitudinal sectional view showing the extruded state of another embodiment similar to the present invention. 3 and 4, a guide portion 12d is arranged on the inner peripheral surface of the main ring 12a of the clean-out disc 12 as in FIG. On the other hand, a free dummy block 11 having an outer peripheral surface having a circular shape is arranged at the front end portion of the auxiliary ring 12b in the pushing direction, and the outer peripheral surface of the free dummy block 11 is slid at equal intervals and between the inner surfaces of the containers 1a. By providing, for example, six shell-cutting projections 11d configured so that the gaps are small so that they can come into contact with each other, tilting of the free dummy block 11 is naturally restricted, and the front end of the shell-cutting projections 11a is restricted. The portion is an arrow-shaped tip portion 11 in plan view.
The container shell 14 attached to the inner surface of the container 1a is cut in the extrusion press direction when the billet 10 is extruded under pressure. By this cutting, the shell 14 can be scraped off more easily by the main ring 12a of the clean-out disc 12.

An extrusion method of a double-acting direct extrusion press using the clean-out disc according to the present invention will be described.
2 and 3 are almost the same as FIG.
The case will be described as a representative. Dies before extrusion press 3,
The positional relationship (initial position) among the container holder 1, the billet loader 9, the extrusion stem 8a, and the mandrel 5 is as shown in FIG. From the state shown in FIG. 6, first, the container holder 1 is moved forward to bring the container 1a into contact with the die 3, and the free dummy block 11 and the billet 10 fitted to the clean-out disc 12 from the extrusion direction are mounted on the billet loader 9. Place (Fig. 7). Next, the pier salum 28 is activated to operate the mandrel 5
Is temporarily advanced (FIG. 8), the tip of the mandrel 5 is inserted into the central through holes 11a and 12c of the free dummy block 11 and the clean-out disc 12, and abutted on the end face of the billet 10. After this, the main ram 23 is advanced to the left and the tip of the extrusion stem 8a is moved to the clean-out disc 1
2 and the billet 10 through the free dummy block 11 (FIG. 9), the circular billet 10 is loaded into the loading hole 10a of the container 1a, and each end face of the die 3, billet 10 and free dummy block 11 is loaded. Abut and complete upset (Fig. 10)

Next, the pier salam 28 is operated to move the mandrel 5 forward to insert the billet 10, and the mandrel 5
The tip of the die is fixed to the center of the product extruding portion of the die 3 (FIG. 11). Subsequently, the main ram 23 is moved forward again to move the extrusion stem 8a forward to press the billet 10, and the extrusion pipe 13 as a product is extruded from the die 3 (see FIG. 1).
2).

After the billet 10 has been extruded, the piercer ram 28 is first operated to retract the mandrel 5 (FIG. 13), and then the main ram 23 is operated to retract the extrusion stem 8a. Subsequently, the hydraulic cylinder 4 for moving the container is operated to separate the container holder 1 from the die 3, and the cutting device 18 is operated to operate the cutting saw blade 1.
The extruded tube 13 is cut by lowering while rotating 6 (FIG. 14).

Subsequently, the extruding tube 13 is attached to the end platen 2 by a roller table which is a part of the rear equipment (not shown).
While being conveyed and removed from the rear side, the die slide 40 is moved to move the discard receiver 41 from the die 3 to the extrusion press position (FIG. 15). Next, the container holder 1 is moved forward again to bring the container 1a into contact with the discard receiver 41, and in this state, the main ram 23 is operated to move the extrusion stem 8a forward again, so that the discard 17, free dummy block 11, The clean-out disc 12 and the shell 14a scraped and compressed and deposited by the clean-out disc main ring 12a are integrated into the discard receiver 4
Transfer to side 1 (Fig. 16).

After that, the main ram 23 is operated to move the extrusion stem 8a backward to move it to the right, and the pier salam 28 is operated to move the mandrel 5 backward to the backward limit, and then the container holder 1 is also moved backward. After moving the die slide 40, the die 3 is again positioned so as to be the center of the extrusion press and one press cycle is completed (see FIG. 1).
7).

[0028]

As is apparent from the above description, in the double-acting direct extrusion method using the clean-out disc according to the present invention, the container that moves in the axial direction and the end platen on one end side of the container are provided. A fixed die, an extruding stem that moves axially to the other end, and a mandrel that moves relative to each other in the extruding stem are coaxially provided, and the billet and shell are extruded in the container before the die is extruded. It consists of a free dummy block and an integral shape with large and small diameter parts, and scrapes the shell that occurs during billet pressure extrusion is positioned in the order of the clean-out disc that is used in the large diameter part, and the extrusion stem moves after the billet piercing is completed. Then press the dice while positioning the mandrel coaxially with the container using the clean-out disc. By simultaneously performing the compression and deposition of the shell in the shell accommodation space surrounded by the free dummy block, the container and the clean-out disc, the extrusion stem is advanced once to extrude the product from the die as in the conventional case. After cutting the product and discard with the cutting device, it is not necessary to insert the cleanout disc into the container by re-advancing the extrusion stem to peel off the container shell.
The shortening of the press cycle significantly improves the product cycle. In addition, the mandrel is automatically positioned coaxially with the container simply by disposing the clean-out disc in the front part of the extrusion stem, which greatly improves the work time for core adjustment. Furthermore, since the billet is extruded in the sliding contact state between the clean-out disc and the container, there is no play, and the extruded tube is extruded while the mandrel shaft is held coaxially with the container shaft. The wall thickness accuracy of the pipe is improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an extruded state according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing an extruded state of another embodiment similar to the present invention.

FIG. 3 is a vertical cross-sectional view showing an extruded state of yet another embodiment similar to the present invention.

FIG. 4 is a perspective view of a free dummy block and a cleanout disc of FIG.

FIG. 5 is a cross-sectional front view of the entire extrusion press that performs extrusion using a clean-out disc.

FIG. 6 is a front view showing the initial state position of each device before the start of extrusion.

FIG. 7 is a front view showing the rise of the container seal and the billet loader.

FIG. 8 is a front view showing a temporary advancing state of the mandrel.

9: Advancement of extrusion stem and No. It is a front view which shows the state of 1 billet loader.

FIG. 10 is a front view showing an upset state.

FIG. 11 is a front view showing piercing of a billet.

FIG. 12 is a front view showing extrusion of an extruded tube by advancing an extruding stem.

FIG. 13 is a front view showing the retracting of the mandrel upon completion of billet extrusion.

FIG. 14 is a front view showing the cutting of the extruded pipe with a cutting saw blade.

FIG. 15 is a front view showing a conveyed state of the extruded pipe.

FIG. 16 is a front view showing a taken-out state of a shell, a discard, a free dummy block, and a clean-out disc.

FIG. 17 is a front view showing a state before the start of extrusion.

[Explanation of symbols]

 1a Container 3 Dice 5 Mandrel 5a Mandrel Tip 8a Extrusion Stem 9 Billet Loader 10 Billet 10a Billet Loading Hole 11 Free Dummy Block 11a Recesses 11b, 12c Central Through Hole 11c Tip Point 11d Projection 12 Cleanout Disc 12a Main Ring 12b Auxiliary Ring 12d Guide part 13 Extrusion pipe 14 Container shell 14a Shell 15 Shell accommodation space part 17 Discard 40 Die slide 41 Discard receiver

Claims (1)

[Claims] 1. A container that moves in the axial direction, a die fixed to an end platen at one end of the container, an extrusion stem that moves in the axial direction at the other end, and a mandrel that makes relative movement in the extrusion stem. It has a coaxial structure, and has a free dummy block for extruding the billet and shell inside the container before die extrusion, and an integral shape with large and small diameter parts. The die is extruded while the mandrel is positioned coaxially with the container by the cleanout disc by moving the extrusion stem after the piercing of the billet is completed in order of the cleanout disc to be performed in the above section. The shell storage space surrounded by the out disk A double-acting direct extrusion method using a clean-out disc, which is characterized in that compression deposition of the resin is also performed simultaneously.