JPH11216714A - Method for continuously cutting extrusion moldings and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for continuously cutting extrusion moldings by which it is possible to stably manufacture cut products whose cross section is less deformed from bar-like moldings extruded from an extrusion molding machine, and a device for continuously cutting the extrusion moldings. SOLUTION: This method for continuously cutting extrusion moldings makes the first cutting of bar-like extrusion moldings 4 which are extruded from the die 2 of an extrusion molding machine 1 to a constant length on the surface of a die 2. The first cut products 6 thus obtained are conveyed at higher conveyance speed B than an extrusion speed A, using a first conveyance device 7. After that, the cut products 6 are transferred to a second conveyance device 8 at a higher conveyance speed C and then are conveyed. Finally, the cut products are discharged from the second conveyance device 8 and are cut to a shorter length as a second cutting step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously cutting a rod-like molded product extruded from an extruder and an apparatus used for the method.

[0002]

2. Description of the Related Art As a method for continuously cutting an extruded raw material mainly composed of inorganic substances such as clay, ceramics, minerals, metal oxides and metal salts, an extruded product is connected to an extruder. After cutting on the transfer device
Japanese Unexamined Patent Publication No. Hei 6-210613 proposes a method in which the cut extruded product is discharged by a discharge device in a direction perpendicular to a conveying device and is cut into a shorter length.

[0003]

However, when this method is applied to a hollow extruded product such as a honeycomb, a column, or a cylinder because it is cut on a transfer device, the extruded product is pressed by a cutting blade. May be deformed. Further, in this method, the interval between the extruded products being conveyed is narrow, so that the stroke of the discharge device needs to be performed at a high speed, so that there is a problem that the frequency of failure of the discharge device increases. The interval between the extruded products can be widened by increasing the conveying speed of the conveying device, but in that case, there is a problem that the extruded products are stretched.

Accordingly, an object of the present invention is to provide a method of continuously cutting an extruded product capable of stably producing a cut product having a small cross-sectional shape from a rod-shaped product extruded from an extruder, and a method for continuously cutting the same. It is to provide a device.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an extruder.
A rod-shaped extruded product (4) extruded from the die (2) of (1)
Is first cut to a predetermined length on the surface of the die (2), and the obtained first cut product (6) is transferred by a first transfer device (7) having a transfer speed B higher than the extrusion speed A, Subsequently, the sheet is transferred to another second transfer device (8) having a still higher transfer speed C, transferred, and finally discharged from the second transfer device (8).
This is a continuous cutting method of an extruded product to be cut.

The present invention also relates to a continuous cutting apparatus for extruded products, which is connected to an extruder (1) having a die (2) for obtaining a rod-shaped extruded product (4), and an extruder (1). The first conveying device (7) which is installed and the conveying direction is the same as the extrusion direction and the conveying speed is faster than the extrusion speed of the extruded product (4), the length of the extruded product (4) becomes a specific length A first sensor (5) for detecting that the extruded product (4) has been fixed to a predetermined length on the surface of the die (2) according to an instruction from the first sensor (5).
A first cutting machine (3) that cuts and obtains a first cut product (6), which is connected to a first transfer device (7), has a transfer direction the same as that of the first transfer device (7), and has a transfer speed of 2nd transfer device faster than transfer device (7)
(8), the first cut product (6) being conveyed in the second conveyance device (8)
A second sensor (9) for detecting that the first cut product has come to the discharge position, and a direction orthogonal to the transport direction of the second transport device (8) by the instruction of the second sensor (9). And a second cutting machine (12) for cutting the discharged first cut product (6) to a shorter length. is there.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the continuous cutting method of the present invention,
Examples of the shape of the rod-shaped extruded product (4) extruded from the die (2) of the extruder (1) include a honeycomb shape, a column shape, a cylindrical shape, a polygonal column shape, a polygonal cylindrical shape, and the like. Further, the cross section may be a column shape such as a star shape or a clover shape.

The extruded rod-shaped extruded product (4) is cut into a predetermined length on the surface of the die (2). This cut is called a first cut, and the obtained cut product is called a first cut product (6). By cutting on the die surface in this way, deformation of the cross-sectional shape during cutting can be minimized. This is particularly effective for cutting a hollow molded article such as a cylinder whose cross-sectional shape is easily deformed.

The obtained first cut product (6) is transported by a first transport device having a transport speed B higher than the extrusion speed A. As a result,
The first cut product (6) can be conveyed with an interval from the preceding first cut product without contacting the subsequent extruded product (4). Here, the extrusion speed A is an extrusion molding machine
Molded product extruded per unit time from the die (2) of (1)
(4) Refers to the length.

Subsequently, the first cut product (6) is transferred from the first transfer device (7) to the second transfer device (8) having a higher transfer speed C.
As a result, the interval between the first cut products (6) further increases.

Finally, the first cut products (6) are sequentially discharged from the second conveying device (8), and the second cut machine cuts the first cut products (6) to a shorter length.
Disconnect.

Next, an example of a continuous cutting apparatus for extruded products of the present invention will be described with reference to the drawings. FIG. 1 is a partially omitted plan view illustrating the configuration of a continuous cutting device for a molded product continuously extruded from a die of an extrusion molding machine. FIG. 2 is a partially omitted side view of this. FIG. 3 is a partially omitted front view and a side view illustrating a configuration of a first cutting machine using a piano wire as a cutting blade. FIG. 4 is a partially omitted front view and a side view illustrating a configuration of a first cutting machine using a metal blade as a cutting blade. FIG. 5 is a partially omitted side view illustrating the configuration of a second cutting machine using a piano wire as a cutting blade. FIG.
FIG. 4 is a partially omitted side view illustrating a configuration of a second cutting machine using a rotating metal blade as a cutting blade.

[0013] The rod-shaped extruded product (4) is formed by an extruder.
The first die connected from the die (2) of (1) to the extrusion molding machine (1)
It is continuously extruded onto a conveyor (7). First transfer device (7)
Is preferably the same as or slightly lower than the lowermost part of the discharge port of the die (2).

FIGS. 1, 2, 5 and 6 show extrudates.
Although the shape of (4) is represented by a cylindrical shape for convenience, it is not particularly limited to this shape. The shape of the extruded product (4) may be, for example, a honeycomb shape, a cylindrical shape, a polygonal column shape, a polygonal cylindrical shape, or the like. Further, the cross section may be a column shape such as a star shape or a clover shape.

The fact that the length of the rod-shaped extruded product (4) extruded from the die (2) reaches a specific length is detected by a first sensor (5) installed at a predetermined position. Normal,
The first sensor (5) is installed on the first transfer device (7). First
The type of the sensor (5) is not particularly limited, but a non-contact type such as an optical sensor is preferable.

When the first sensor (5) senses that the length of the extruded product (4) has reached a specific length, it sends a signal of a cutting instruction to the first cutting machine (3). As a result, the first cutting machine (3) makes a first cut of the extruded product (4) on the surface of the die (2) of the extruder (1). Therefore, even when the extruded product is soft, the cross-sectional shape of the obtained first cut product (6) is hardly deformed. This method is particularly effective for cutting a hollow molded product such as a cylinder whose cross-sectional shape is easily deformed.

The length of the first cut product (6) is set to a length that does not hinder cutting by the second cutting machine (12) described later. This length is generally about several cm to 50 cm. When the first cut product (6) is lengthened, the extruded product (4) is produced by the difference between the extrusion speed A and the transport speed B of the first transport device (7) until the first cut, that is, during extrusion. May be stretched. The long first cut product (6) is the first
When transferring from the transfer device (7) to the second transfer device (8), stretching may occur due to the speed difference between the two, so that an appropriate length must be selected.

The type of the first cutting machine (3) is not particularly limited. Examples of such a cutting machine include a cutting device using a piano wire (15) shown in FIG. 3 and a metal blade (17) shown in FIG. ), And these are driven by an air cylinder or the like. In order to reduce the adhesion of dirt by the extruded product (4) and to facilitate the cleaning when the dirt is soiled and to perform stable continuous operation, it is necessary to use cutting blades such as a piano wire (15) and a metal blade (17). The material of the die (2) is preferably low in tackiness. Examples of such a material include a low-adhesive resin such as Teflon and a well-polished metal. Further, in order to ensure the straightness of the first cut product (6) on the first transfer device (7) and to perform stable transfer and cutting,
It is preferable that the cutting machine (3) has a mechanism in which a cutting blade operates intermittently up and down to cut.

The conveying direction of the first conveying device (7) for conveying the first cut product (6) is the same as the direction in which the extruded product (4) is extruded from the die (2). First transfer device (7)
Is required to be higher than the extrusion speed A in order to stably convey even if the extrusion speed A slightly fluctuates.
The speed is 5 times, preferably 1.5 to 3 times. If the conveying speed B of the first conveying device (7) is less than 1.01 times the extrusion speed, the fluctuation of the extrusion speed A causes the subsequent extruded product to change.
(4) and the first cut product (6) may adhere on the cut surface. Further, if the transport speed B of the first transport device (7) exceeds five times the extrusion speed A, the extruded product 6 may be stretched before the first cutting and its shape may be changed.

The material of the transfer surface of the first transfer device (7) that comes into contact with the first cut product (6) is to reduce the stretching of the extruded product (4) before the first cut, and to reduce the first cut product (4). In order to stably transfer the first transfer device (7) from 6) to the second transfer device (8),
Those having little adhesion to the first cut product (6) are preferable. In particular, a smooth cloth without fluff is preferable, and such a cloth is, for example, a cloth made of Tetron (registered trademark).

The first cut product transported by the first transport device (7)
(6) is connected to the first transfer device (7) and the transfer direction is the first
It is continuously transferred to the second transporting device (8) in the same direction as the transporting device (7). Therefore, it is preferable that the height of the transfer surface of the second transfer device (8) is equal to or slightly lower than the transfer surface of the first transfer device (7).

The transfer speed C of the second transfer device (8) is set to be equal to the first transfer device (7) in order to further increase the interval between the first cut products (6).
It should be faster than the transfer speed B of the first transfer device (7), usually 1.01 to 10 times, preferably 1.5 to 5 times. When the transfer speed C of the second transfer device (8) is less than 1.01 times the transfer speed B of the first transfer device (7), the interval between the first cut products (6) is hardly widened, and the transfer speed of the transfer is reduced. No effect. Also, when the transfer speed C of the second transfer device (8) exceeds 10 times the transfer speed B of the first transfer device (7), the first cut product (6) is subjected to an excessive stretching action at the time of transshipment. May change.

The material of the transfer surface of the second transfer device (8) is the first
As with the first transporting device (7), it is preferable that the adhesion of the cut article (6) to the first cut article (6) is small so that the cut article (6) can be easily discharged and stable continuous operation can be performed. In particular, a smooth cloth without fluff is preferable, and such a cloth is, for example, a cloth made of Tetron (registered trademark).

The device used to discharge the first cut product (6) from the second transporting device (8) is not particularly limited.
And the discharge device (10) shown in FIG. The arrival of the first cut product (6) at the discharge position is sensed by the second sensor (9), at which point the second sensor (9) sends a signal of a discharge instruction to the discharge device (10). The second sensor (9) is the first cut product
It is only necessary to know that (6) has reached the discharge position, and the installation position is not limited to the upstream side of the discharge device (10) shown in the figure, and may be located downstream or at other positions. Good.
The type of the second sensor (9) is not particularly limited, but a non-contact type such as an optical sensor is preferable.

The discharge device (10) discharges the first cut product (6) from the second transfer device (8) in response to a discharge instruction signal from the second sensor (9). Although there is no particular limitation on the discharge direction, the discharge is normally performed in a direction orthogonal to the transport direction as shown in the figure.
Since the discharging device (10) needs to continuously perform a discharging operation, a device that performs an operation that does not hinder the conveyance of the subsequent first cut product (6) is used. As such a discharge device (10),
A mechanism having a cylinder as illustrated in the figure and performing a discharge operation by a stroke operation of the cylinder is exemplified. Particularly, those using an air cylinder or a hydraulic cylinder are preferable.

Discharge jig fixed to discharge device (10)
(11) The length is made longer than the first cut product (6). The part where the discharge jig (11) comes into contact with the first cut product (6) is preferably made of a material with little adhesion of dirt, for example, a smooth cloth or wood made of Tetron (registered trademark).

The discharged first cut product (6) is second cut into a shorter length by a second cutting machine. As such a second cutting machine, a mechanism capable of simultaneously cutting the first cut product (6) is preferable. Specifically, for example, the first cut product (11) shown in FIG. 6) A second cutting machine that cuts by pressing a plurality of equally spaced piano wires (13)
One having a structure such as (12) is mentioned. In this case, it is preferable that a material having a buffering action such as a sponge is adhered to the contact surface of the discharge jig (11) with the first cut product (6). As another example of the second cutting machine (12), there is one having a circular metal second cutting rotary blade (19). When this apparatus is used, the first cut product (6) discharged from the second transfer device (8) is rotated by an external drive through a second cutting machine input plate (18), and the second cutting fixed blade rotating shaft is rotated. It is cut by the second cutting rotary blade (19) attached to (20). Second
The height of the cutting machine loading plate (18) on the side of the second transfer device (8) is preferably the same or slightly lower than the transfer surface. The receiving roll (21) shown in FIG. 6 is not always necessary, but when used, it is reversely rotated with respect to the second cutting rotary blade (19) by an external drive or is freely rotated. Since the receiving roll (21) rotates the first cut product (6) at the time of the second cutting, a second cut product (23) having a uniform cross section is obtained. The second cutting machine having such a mechanism is suitable for cutting the first cut product (6) which is easy to roll, such as a circular cross-sectional outer peripheral shape.

In order to perform a stable continuous operation, a discharge jig (11), a cutting wire such as a piano wire (13) of a second cutting machine (12) and a rotary blade (19) for a second cutting, and the like are used. 2 The parts that come into contact with the first cut product (6) such as the cutting machine input plate (18) and the receiving roll (21)
It is preferable to use a low-adhesion resin such as Teflon or a low-adhesion material such as a well-polished metal, which adheres little dirt and is easy to clean when it becomes dirty.

[0029]

According to the continuous cutting method and apparatus of the present invention, it is possible to stably produce a cut product having a small sectional shape from a rod-shaped product extruded from an extruder.

[Brief description of the drawings]

FIG. 1 is a partially omitted plan view illustrating a configuration of a continuous cutting device for a molded product continuously extruded from a die of an extrusion molding machine.

FIG. 2 is a partially omitted side view of the continuous cutting device.

FIG. 3 is a partially omitted front view and a side view illustrating a configuration of a first cutting machine using a piano wire as a cutting blade.

FIG. 4 is a partially omitted front view and a side view illustrating a configuration of a first cutting machine using a metal blade as a cutting blade.

FIG. 5 is a partially omitted side view illustrating a configuration of a second cutting machine using a piano wire as a cutting blade.

FIG. 6 is a partially omitted side view illustrating the configuration of a second cutting machine using a rotating metal blade as a cutting blade.

[Explanation of symbols]

 1) Extrusion molding machine 2) Die 3) First cutting machine 4) Extruded product 5) First sensor 6) First cut product 7) First transport device 8) Second transport device 9) Second sensor 10) Discharge Apparatus 11) Discharge jig 12) Second cutting machine 13) Piano wire 14) First cutting piano wire fixing jig 15) First cutting blade (piano wire) 16) First cutting air cylinder fixing jig 17) First cutting blade (metal blade) 18) Second cutting machine loading plate 19) Second cutting rotary blade 20) Second cutting fixed blade rotary shaft 21) Receiving roll 22) Receiving roll rotary shaft 23) No. 2-cut product A) Extrusion speed B) First transport speed C) Second transport speed

Claims (2)

[Claims] 1. A rod-shaped extruded product (4) extruded from a die (2) of an extruder (1) is first cut to a predetermined length on the surface of the die (2), and the obtained product is obtained. The first cut product (6) is transferred by the first transfer device (7) having a transfer speed B higher than the extrusion speed A,
Subsequently, the extruded product is transferred to another second transfer device (8) having a further higher transfer speed C, transferred, and finally discharged from the second transfer device (8), and then cut into a shorter length. Continuous cutting method. 2. A continuous cutting apparatus for extruded products, comprising:
An extruder (1) having a die (2) from which a rod-shaped extruded product (4) is obtained, connected to the extruder (1), the extruded product having the same conveying direction as the extruding direction and a conveying speed A first conveying device (7) faster than the extrusion speed of (4), a first sensor for detecting that the length of the extruded product (4) has reached a specific length;
(5) A first cutting machine for first cutting the extruded product (4) to a predetermined length on the surface of the die (2) according to an instruction of the first sensor (5) to obtain a first cut product (6). (3) a second transport device (8) connected to the first transport device (7), the transport direction is the same as the first transport device (7), and the transport speed is faster than the first transport device (7); The second sensor (9) for detecting that the first cut product (6) being conveyed at the second conveying device (8) has reached the discharge position, and the first cut product (6) is instructed by the second sensor (9). ) For discharging the first cut product (6) into a shorter length, and a discharge device (10) for discharging the first cut product (6) in a direction orthogonal to the transfer direction of the second transfer device (8). (12) A continuous cutting device for extruded products, characterized by having (12).