JPH06238325A - Extruded profile cutting method - Google Patents

Abstract

PURPOSE:To improve the productivity of an extruded shape by setting a cutting position at the generating time of a stop mark at a position far a special distance from the generating part of a stop mark in an extruding machine. CONSTITUTION:When after the extruded shape 7 loaded in the extruding machine 3 is extruded by a prescribed extruding stroke, next billet is loaded into the extruding machine 3 to be joined and extruded, a cutting machine 4 is moved to a cutting position X when a stop mark is generated to cut the extruded shape 7 and the cutting position X when the stop mark is generated is made a position far a product length L2 +alpha from the generating part Y of the stop mark in the extruding machine 3. This alpha is given nearly by a tong hold of a stretcher for holding and drawing the tip part of the extruded shape 7 at the extruding time. In this way, the neighborhood of the stop mark part of the extruded shape can be used as the product and payoff of the extruded shape and supplement of next billet can be performed at the same time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a long extruded profile extruded from a billet by an extruder.

[0002]

2. Description of the Related Art As an apparatus for extruding a long extruded shape from a billet by an extruder, for example, one shown in FIG. 1 is known. That is, as shown in FIG. 1, a billet shearing device 2 and an extruder 3 are sequentially arranged on the outlet side of the heating furnace 1, and a cutting machine 4 and an extruded profile conveying device 5 are arranged on the extrusion side of the extruder 3. The metal material heated in the heating furnace 1 is sheared by the billet shearing device 2 into a billet having a predetermined length, and the billet is conveyed to the extruder 3 by the conveying means 6 and extruded in the arrow a direction by the extruder 3. The long extruded profile is molded and cut by the cutter 4, and the long extruded profile is conveyed by the conveying device 5 in the direction of the arrow b.

The extrusion work of the extruded profile by the above-mentioned extruder is carried out by the push-out extrusion method as shown in, for example, JP-A-4-172124. That is, as shown in FIG. 2 (a), the billet charged into the extruder 3 is extruded in a state where a certain amount of discards in which metal oxides are concentrated are left, and then at a predetermined position on the extruding side. The extruded shape member 7 is cut by the cutting machine 4, and the extruded shape member 7 is conveyed in the direction of the arrow b by the conveying device 5 as shown in FIG. The discard cut surface is pressed and repeatedly pushed out as shown in FIG. 2 (c).

According to this push-push extrusion method, a stop mark appears when the extrusion is stopped, and this stop mark portion cannot be used as a product due to scratches or weak strength, and is shown in FIG. 2 (c). As described above, the portion from the preceding cutting portion 7a of the extruded shape member 7 to the stop mark 7b is wasted. In order to solve this, the cutting machine 4 is moved to cut the extruded profile at the stop mark portion as shown in the above-mentioned JP-A-4-172124. That is, as shown in FIG. 3 (a), immediately after extrusion molding, the extruded shape member 7 is cut by the cutting machine 4.
As shown in (b) and (c) of FIG. 3, the cutting machine 4 is moved together with the extruded shape member 7 and extruded when the billet for extrusion is replenished and extruded without being cut.
The cutting is performed by the cutting machine 4 at the portion b, and after the cutting is completed, the cutting machine 4 is returned to the original position and continuously extruded as shown in FIG. 3D.

In addition, the extruded profile extruded by the above-mentioned extruder may be attached with a measurement dimension table at a prescribed point of the cross section of the extruded profile along with data such as the serial number, type and grade when the product is shipped. It is specified by the JIS standard.

To this end, for example, Japanese Patent Laid-Open No. 4-16792
As shown in Japanese Patent Publication No. 4, a sample cutter is provided separately from the cutting machine provided on the extrusion side of the extruder, and the extruded profile extruded first when the die is replaced is cut by the sample cutter to obtain the sample extruded profile. Then, the cross section of the sample extruded profile is measured.

Further, as shown in FIGS. 4 (a), (b), and (c), after the long extruded shape material 7 cut by the cutting machine 4 is slightly moved in the direction of arrow b by the conveying means 5, The cross section is measured by cutting with the manual cutter 8 and taking out the sample extruded profile 7c.

[0008]

As described above, in order to cut the extruded profile at the stop mark portion, a new billet is inserted and extrusion is restarted, and the stop mark appears from the die and the stop mark moves. Since the cutting machine 4 is slid in synchronization and the extruded profile extruded earlier after cutting has to be discharged in the direction b of the conveying means, the extrusion speed cannot be increased. That is, cutting at the stop mark position that first appears when the next billet is extruded has a good yield, but the productivity is poor in terms of paying out the extruded profile.

When the sample extruded profile is cut as described above, a cutter for the sample is required in addition to the cutting machine for cutting the sample into a normal length.

Therefore, an object of the present invention is to provide a method for cutting an extruded profile which can solve the above-mentioned problems.

[0011]

When the billet charged into the extruder 3 is extruded by a predetermined extrusion stroke and then the next billet is charged into the extruder 3 to perform push-join extrusion molding, the cutting machine 4 is used. Is a method for cutting an extruded profile, in which the cutting section is moved to a cutting position separated by the product length L ₂ + α from the stop mark generating portion of the extruder 3 and cut. When exchanging the die of the extruder 3, the cutting machine 4 is moved from the normal cutting position to a sample cutting position separated by the sample extruded shape length L ₃ to cut the extruded shape, and then the cutting machine 4 is normally operated. A method for cutting an extruded profile, which is used as a sample extruded profile by moving to a cutting position and cutting.

[0012]

[Operation] Since the tip part is the product length + α longer than the stop mark part of the extruded profile extruded the second time during extrusion molding, use the product near the stop mark part of the extruded profile. It is possible to discharge the extruded shape and refill the next billet at the same time, which improves the productivity. The sample extruded profile can be cut using a cutting machine normally used for extrusion molding.

[0013]

[Example] As shown in Fig. 5 (a), when a billet is charged into the extruder 3 and extrusion molding is performed for the first time, extrusion is stopped for a predetermined length and then the extrusion is stopped.
Is moved to the cutting position X when the stop mark is generated, the extruded profile 7 is cut, and the extruded profile 7d is conveyed by the conveying means 5 by the arrow b.
Carry in the direction and pay out. The cutting position X when the stop mark is generated is a distance of the product length L ₂ + α from the stop mark generating portion Y, and the cutting position is arbitrarily controlled depending on the length of the product length. This α is about the grip allowance of the stretcher that grips and pulls the tip of the extruded profile during extrusion.

Next, when the billet is charged and extrusion molding is carried out, as shown in FIG. 5B, the product length L from the tip end surface of the extruded shape member 7 (cross section 7e at the time of cutting) is shown. ₂ + α
A stop mark 7f is generated at the position, the cutting machine 4 is set to the cutting position X, and the extrusion molding is stopped and cut after extrusion molding for a predetermined extrusion stroke, and the extruded profile is conveyed by the conveying means 5 in the direction of arrow b. Pay out.

By doing so, the length of the tip portion 7g of the extruded shape member 7 becomes longer than the stop mark portion 7f, which is the product length L ₂ + α, and the vicinity of the stop mark portion 7f can be used as a product. Since the material 7 can be cut, the cut extruded shape can be discharged, and the next billet can be charged at the same time, the productivity is improved.

Next, a method of cutting the sample extruded profile when exchanging dies will be described. As shown in FIG. 6A, the cutting machine 4 is moved to the sample cutting position C during the first extrusion molding after the die replacement, and after extrusion molding for a predetermined extrusion stroke, the extrusion profile 7 is cut by the cutting machine 4. To do. The sample cutting position C is a position separated from the normal cutting position X by the sample extruded shape length L ₃ . As shown in FIG. 6B, the cutting machine 4 is moved to the normal cutting position X to cut the extruded profile to form a sample extruded profile 7g. By cutting in this manner, the sample extruded shape 7g can be cut by one cutting machine 4.

[0017]

[Effects of the Invention] Since the tip portion of the extruded profile extruded the second time at the time of extrusion splicing is the product length + α, the product near the stop mark part of the extruded profile. The productivity can be improved because it can be used and the extrusion profile can be cut, the extrusion profile can be discharged and the billet can be inserted at the same time. . The sample extruded profile can be cut using a cutting machine normally used for extrusion molding.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an extrusion device.

FIG. 2 is an explanatory diagram of a conventional cutting method when a stop mark occurs.

FIG. 3 is an explanatory diagram of a conventional cutting method when a stop mark occurs.

FIG. 4 is an explanatory diagram of a conventional method for cutting a sample extruded profile.

FIG. 5 is an explanatory diagram of a cutting method when a stop mark is generated according to the present invention.

FIG. 6 is an explanatory diagram of a method for cutting a sample extruded profile according to the present invention.

[Explanation of symbols]

 3 ... Extruder, 4 ... Cutting machine, 7 ... Extrusion profile.

Claims (2)

[Claims] 1. When a billet charged in the extruder 3 is extruded by a predetermined extrusion stroke and then the next billet is charged in the extruder 3 and extrusion molding is performed, a cutting machine 4 is used. A method for cutting an extruded profile, which comprises moving to a cutting position separated by the product length L ₂ + α from the stop mark generating part and cutting. 2. A cutting machine 4 when the die of the extruder 3 is replaced.
Is moved from the normal cutting position to the sample cutting position separated by the sample extruded shape length L ₃ to cut the extruded shape, and then the cutting machine 4 is moved to the normal cutting position to cut the sample extruded shape. A method for cutting an extruded profile, which is characterized in that