JPS6319244B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a fixed-length billet used in manufacturing extruded sections of aluminum or the like.

2. Description of the Related Art In a method in which a long ingot is cut into a fixed-length billet and then extruded, an off-cut ingot of insufficient size is produced at the rear end of the long ingot. When this end material ingot is short in size, it is scrapped because it may fall over during handling and cause problems, but when it is somewhat long, the rear end is used as the front end of the long ingot that follows. It is known that billets of predetermined dimensions are then sequentially cut.
(For example, see Japanese Patent Publication No. 59-7524.) Problems to be Solved by the Invention In the above-mentioned prior art, as shown in FIG. Because of this, it is normal that the ingot is not straight in the longitudinal direction and has a slight bend s, so when the front end material ingot 2 is integrally joined to the tip by welding etc.
The opposing end surfaces 3 do not come into uniform contact, resulting in a gap t. Therefore, air remains in the gap t during extrusion, which adversely affects the extruded shape. Furthermore, since it is difficult to rotate the curved long ingot 1 during welding, the welding device must be rotated around the ingot, making the structure complicated.

The present invention solves these problems.

Means for Solving the Problems The present invention provides that when a long ingot is cut into a predetermined size to produce a fixed-length billet for an extruded shape, the length of the ingot shortened by cutting is reduced to a fixed length. When the ingot reaches a predetermined size that is longer than one billet and shorter than approximately half the length of the long ingot, it is saved as a residual ingot, and the next long ingot is cut. A billet of fixed length is produced, and a residual ingot similar to that described above is produced from this billet, and then both of the residual ingots are joined in the axial direction to form a joined ingot, and then this joined ingot is sequentially cut. This method of manufacturing a billet for an extruded shape material is characterized in that the billet is cut to a fixed length so as not to produce scrap ingots, and the bending of the long ingot is prevented from appearing when the ingots are joined.

In the above, measuring the length of the residual ingot,
It is preferable that the joining of the remaining ingots and the cutting of the billet to a fixed length be performed automatically.

Example Examples will be described below based on the drawings.

In FIG. 1, a long ingot 1 (for example, 5
~9m) is moved by a conveyor 4 (for example, a roller conveyor), stopped at a fixed position by a stopper 5 that goes in and out of the conveyor 4, and cut into a fixed length l (for example, 400 to 900mm) by a cutting machine 6. The billet 7 is cut into length billets 7, the direction of which is changed by the direction change device 13, and extruded by an extruder (not shown) either directly or after passing through a billet heater. The cutting machine 6 cuts residual ingots 10, 10' of a predetermined length, that is, residual ingots of a predetermined size within a range that is longer than one fixed-length billet and shorter than approximately half the length of a long ingot. In order to obtain an ingot, the first length measuring device 8 and the second
A length measuring device 9 is provided, and the first length measuring device 8 measures a distance l corresponding to the length of one regular billet from the cutting machine 6, for example.
In addition, the second length measuring device 9 is located at a distance l further than the first length measuring device 8, but as another example, the distance from the cutting machine 6 to the first length measuring device 8 is 2l
or 3l..., and any length may be used as long as the length of the distance +α does not exceed approximately half of the length of the long ingot 1.

When the first length measuring device 8 and the second length measuring device 9 are both operating, the billet 7 is cut to a fixed length.
When the end of the long ingot 1 passes through the second length measuring device 9 without passing through the first length measuring device 8, the cutting operation of the ingot 1 which has become shorter due to cutting is stopped, and the remaining ingot is The remaining ingot 10 is evacuated to the evacuating section 11.

The next long ingot 1 is also cut into fixed-length billets 7 in the same manner as described above, and the resulting residual ingot 10' is fed into the shunting section 11, brought into contact with the residual ingot 10, and joined. They are joined by a machine 12.

Then, the joined ingot is returned to the cutting device and the billet 7 of fixed length is cut. Similar residual ingots generated there are again evacuated to the evacuating section 11.

The above process will be described with a focus on cutting the long ingot 1. In Fig. 2A, when five regular billets 7 with a length l are cut from the long ingot 1, a residual ingot with a length l+α is produced at the end. 10 occurs.

FIG. 2B shows the state in which the next long ingot 1 is cut, and a residual ingot 10' having a length l+α is also generated here.

The residual ingot 10 and the residual ingot ¹⁰¹ are joined as shown in C to form a joined ingot,
When two billets are cut to a fixed length as shown in d, a residual ingot 10 ² of length l+β is produced.

E shows the cutting state of the next long ingot 1, but here as well, a residual ingot 10 of length l + α is generated, so this residual ingot 10 is
As shown in F, the above-mentioned residual ingot ¹⁰² is joined to form a joined ingot, and a regular length billet is cut from this joined ingot in the same manner as described above.

FIG. 3 shows a different embodiment from the one shown in FIG. 1 which adopts the process shown in FIG.
0 ¹ from the cutting machine 6, and the residual ingot 10
are returned from the shelter part 11 by reversing the conveyor 4 and joined, and then the joined ingots 1
⁰² is cut into regular length billets 7 by a cutting machine 6.

FIG. 4 shows another embodiment, in which a bypass conveyor 14 is installed in parallel with the conveyor 4, and the remaining ingots 10, 10 ¹ and even 10 ² are transferred from the shelter section 11 and transported to the bonding machine 12. The joined ingots thus joined are transferred onto a conveyor 4, supplied to a cutting machine 6, and cut into billets 7 of fixed length.

In this case, the cutting condition of the fixed-length billet can be as shown in FIG. 5. That is, when five regular-sized billets 7 having a length l are cut from the long ingot 1 in step A, a residual billet 10 having a length l+α is generated.

B shows the state of cutting of the next long ingot 1, which also shows the remaining ingot 10 ¹ of length l+α.
occurs.

Then, in C, the remaining ingots are 10
The steps up to the joining of the ingots 101 and ¹⁰¹ are the same as those shown in FIG. 2, but at the same time, another long ingot 1 is cut as shown in C, and a residual ingot ¹⁰¹ is produced.

In step D, the billet 7 of fixed length is cut from the bonded ingot in step C to produce a residual ingot ¹⁰² , which is joined to the preceding residual ingot ¹⁰¹ in step E. At the same time, the next long ingot 1 is cut in the hole, and a residual ingot 10 is generated.

Next, in F, the fixed-length billet 7 is cut from the bonded ingot in E to produce a residual ingot 10 ³ of length l+γ, and then in G,
This remaining ingot 10 ³ and the remaining ingot 10 in E are joined, and the next cutting step is carried out.

The above steps are repeated to continuously cut the billet to a fixed length to obtain an extruded shape.

In addition, the residual ingots in the examples may be joined by welding, friction welding, etc. Also, small holes are drilled in the joint surfaces of both residual ingots, and both ends of a pin are inserted into these small holes to tightly connect the joint surfaces. let me,
A method of joining both remaining ingots via pins may also be used.

In short, the present invention stops cutting at a stage before making short scrap ingots that would cause problems in transportation, handling, etc., uses the ingot at this point as a residual ingot, and joins it with the next ingot. The ingot at the time of joining is
The ingot is longer than the length of one standard-length billet and shorter than approximately half the length of a long ingot, resulting in a short or short ingot in which the bending of the long ingot hardly appears during joining. The purpose is to cut and join the ingots, and then cut the ingots into regular billets in the same way as long ingots.

Effects of the invention By controlling the dimensions of the residual billet within a predetermined range, handling of the residual billet (transfer and handling, etc.) becomes easier, and all parts except the front and rear ears can be used effectively.
Yield is improved. In addition, since the effects of bending of long ingots caused by casting and homogenizing processes are almost eliminated, alignment at joints becomes easier and extrusion defects such as gas entrainment during extrusion are minimized. can. Furthermore, the reliability of joining and handling operations is increased, making it easier to mechanize the line.

In addition, the length of the residual ingot in the present invention is
It is more effective if the length is longer than the length of the regular billet and shorter than twice the length of the regular billet in the sense that the influence of bending at the end of the long-curved ingot is minimized.

[Brief explanation of the drawing]

FIG. 1 is a plan view explaining an embodiment of the present invention, FIG. ,
FIG. 4 is also a plan view of another embodiment, FIG. 5 is an explanatory diagram of the order of steps for cutting a billet to a fixed length in the case of FIG. 4, and FIG. 6 is an explanatory diagram of a previous example. 1... Long ingot, 2... End material ingot, 3... End surface, 4... Conveyor, 5... Stopper, 6... Cutting machine, 7... Fixed length billet, 8...
First length measuring device, 9...Second length measuring device, 10,10 ¹ ,
10 ² , 10 ³ ...residual ingot, 11 ... shelter section, 12 ... joining machine, 13 ... direction changing device.

Claims (1)

[Scope of Claims] 1. When cutting a long ingot into predetermined dimensions to produce a billet of a predetermined size for extrusion, (1) Cutting a long ingot in order to produce a billet of a predetermined size. In the process, when the length of the ingot shortened by cutting reaches a predetermined size within a range that is longer than one standard-sized billet and shorter than approximately half the length of the long ingot, it is recycled as a residual ingot. (2) Similarly, the step of sequentially cutting the next long ingots to produce a fixed-length billet, and thereby producing the same residual ingot as described above; (3) the step of (1) above. ), (2) The remaining ingots are integrally joined together in the axial direction at a predetermined location, for example by welding, to produce a joined ingot; (4) The joined ingot is sequentially cut to form a billet of a fixed length. A method for manufacturing a billet for extruded shape material, comprising the steps of manufacturing.