JPH08318516A - Cutter for extrusion molding - Google Patents

Abstract

PURPOSE: To manufacture a molding having excellent linearity by improving the tuning accuracy of the moving speed of a moving element having a cutter with that of the molding. CONSTITUTION: Uncured extrusion molding is extruded from a vacuum extrusion molding machine 3, and conveyed while being taken OFF by a take-off conveyor 4. A moving unit 6 provided separately from a cutting conveyor 5 is moved in the extruding direction by a moving unit driver 13 provided at the conveyor 5, and a cutting rotary blade is vertically movable. The conveyors 4, 5 are driven by tuning with the extruding speed of the molding. Relative speed measuring means 14 is mounted at the unit 6 to measure the relative speed between the unit 6 and the molding and to so control the moving speed of the unit 6 that the relative speed becomes zero. Since the molding is cut while moving the unit 6 by completely tuning with the moving speed of the molding in this manner, the molding can be straightly cut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device for cutting a molded product such as a cement material extruded by an extruder.

[0002]

2. Description of the Related Art Today, molded articles produced by extrusion-molding cementitious materials are widely used for building materials such as outer walls, partitions and roofs of buildings. Molded bodies made of these cement-based materials are continuously extruded using a vacuum extrusion molding machine, and the resulting strips are cut to a desired length and cured by high temperature and high pressure curing. Is manufactured by.

The panel manufactured by such extrusion molding is required to have a high dimensional accuracy, for example, a molded body of 5 m is required to have a displacement of the molded body side end from a straight line of 2 mm or less. It Since the molded body that has just been extruded by extrusion molding is uncured, it is soft, and even if a small external force is applied, the molded body will be deformed.Therefore, be especially careful not to apply an external force that may deform the molded body. Needed.

In the step of cutting the molded body, for example, as disclosed in Japanese Patent Application Laid-Open No. 1-253406, a measuring device provided on a molded body conveying line from the extrusion mold to the cutting device causes Detects the length and extrusion speed of the extruded molded product, and when it reaches the desired length, transfers it in the extrusion direction on a conveyor that conveys the molded product in the extrusion direction in synchronization with the measured extrusion speed. Known is a cutting device that moves a movable body provided with a cutting device that can be moved in synchronism with the measured extrusion speed, and cuts the molded body by a cutting device such as a rotary blade, a knife-shaped blade or a wire. There is.

[0005]

However, in the conventional cutting device as described above, due to lack of accuracy or deterioration of accuracy of the drive device itself for synchronizing the speed of the moving body with the molded body,
As a result, the moving speed of the moving body and the moving speed of the molded body are not perfectly synchronized, and during cutting of the molded body, an excessive external force acts on the uncured molded body from the cutting machine, causing deformation of the molded body. Will end up.

Further, when the cutting device is a rotary blade and the moving speed of the moving body is faster than the moving speed of the molded body, the uncured molded body receives an external force in the same direction as the extrusion direction.
End deformations as in a and FIG. 2b occur. When the moving speed of the moving body is slower than the moving speed of the molded body, the uncured molded body receives an external force in the direction opposite to the extrusion direction, so that end deformation as shown in FIGS. 2c and 2d occurs.

When such deformation of the molded body occurs, reprocessing such as cutting, cutting and polishing in the finishing process becomes indispensable. Further, an external force along the extrusion direction also acts on the cutting device, resulting in impairing the durability of the cutting device. Therefore, the present invention does not cause deformation such as a cut surface,
It is an object of the present invention to provide a cutting device that does not require post-processing of an extruded molded product and thus improves the durability of the device itself.

[0008]

That is, according to the present invention, a conveying means for conveying a molded body extruded from an extrusion die of an extrusion molding machine and a moving means provided near the conveying means and movable in the extrusion direction. A body, a cutting means attached to the moving body, a relative speed measuring means attached to the moving body for measuring a relative speed between the molded body and the moving body, and a moving body so that the relative speed becomes zero. Is a device for cutting an extruded body, which comprises a relative speed control means for controlling the speed, and the conveying means is provided with an extruded length measuring means for measuring the extruded length of the formed body, and the measured value is a predetermined value. It is a device for cutting an extruded body, which is provided with a cutting length control means for starting the cutting when the value is reached.

The carrying means in the present invention means a conveyor for carrying the extruded molded body, and includes a take-up conveyor, a cutting conveyor, a transfer conveyor, and a discharge conveyor for taking the molded body out of the extrusion die outlet. A free roller conveyor is preferably used as the take-up conveyor. The free roller conveyor is for maintaining the molded body extruded from the extrusion die in a horizontal state and transferring it to the cutting conveyor. With the free rollers, even if the extrusion speed of the molded product fluctuates or pulsation occurs, each free roller can rotate independently according to the surface speed of the molded product with which it comes into contact. No tensile or compressive force acts.

For example, a free roller conveyor has an outer diameter of 30.
A resin having a small friction coefficient is lined or coated on the surface of an aluminum pipe of mm or less, and free rollers having bearings inserted at both ends of the pipe are attached to the frame at a pitch of 60 mm. The cutting conveyor is provided to cut the molded body extruded from the extrusion die and conveyed through the take-up conveyor into a predetermined length. As the cutting conveyor 5, a free roller conveyor, a belt conveyor or the like is used.

The moving body referred to in the present invention is provided on the above-mentioned cutting conveyor as a separate body from the conveyor, and the moving body can move in the extrusion direction, and may be, for example, a frame body. Cutting means is attached to the moving body, and the cutting means is not particularly limited, but examples thereof include a rotary blade, a knife-shaped blade, and a wire. Specifically, a movable body having a structure as disclosed in Japanese Patent Laid-Open No. 1-253406 may be provided separately from the cutting conveyor and movable. Since the cutting means cuts while moving the moving body in the extrusion direction, the moving molding can be cut straight.

Further, the extrusion length measuring means of the molded body fixed on the conveying line from the extrusion die to the moving body and the relative speed measuring means installed on the moving body are a contact type speed measuring device or a non-contact type. It refers to a speed measurement device and is not particularly limited. However, in the contact-type speed measuring device, the speed may be measured slower than the actual extrusion speed due to the adhesion of foreign matter to the detection roller portion,
A non-contact speed measuring device is preferred.

The relative speed measuring means in the present invention is for detecting the relative speed between the moving body and the molded body by a speed measuring device attached to the moving body, and the measured relative speed value is relative speed control. Is output to the means. Further, the relative speed measuring device according to the present invention means a contact type speed measuring device or a non-contact type speed measuring device, and is not particularly limited. However, in the contact type speed measuring device, the non-contact type speed measuring device is preferable because the speed may be measured slower than the actual extrusion speed due to the adhesion of foreign matter to the detection roller portion.

The relative speed control means in the present invention is a means for receiving a relative speed value from the relative speed measuring means and outputting a signal to the moving body drive means so as to make the relative speed zero. The extrusion length measuring means in the present invention is to measure the extrusion length of the molded body by the extrusion length measuring means provided on the conveying means from the extrusion die to the moving body,
The measured extrusion length value is output to the cutting length control means. The relative speed control means also functions to receive the extrusion length value from the extrusion length measuring means and output a control signal for cutting the extruded body to a desired length to the moving body drive means and the cutting means.

The extrusion length measuring means according to the present invention means a contact type speed measuring device or a non-contact type speed measuring device, and is not particularly limited. However, in the contact type speed measuring device, the non-contact type speed measuring device is preferable because the speed may be measured slower than the actual extrusion speed due to the adhesion of foreign matter to the detection roller portion.

The moving body driving means in the present invention comprises a servo amplifier and a moving body driving device. A control signal from the relative speed control means described above is input to the servo amplifier, and in response to this, the moving body drive device is driven so that the relative speed between the moving body and the molded body becomes zero. Further, a control signal from the cutting length control means is also input to the servo amplifier, so that the relative speed between the moving body and the molded body becomes zero when the cutting means starts cutting the molded body. The moving body drive device is driven so as to start speed synchronization between the moving body and the formed body before a fixed time when cutting of the formed body is started.

[0017]

According to the present invention, a conveying means for conveying a molded body extruded from an extrusion die of an extrusion molding machine, a movable body provided in the vicinity of the conveying means and movable in the extrusion direction, and the movable body. A cutting means attached to the moving body, a relative speed measuring means attached to the moving body for measuring the relative speed of the molded body and the moving body, and a relative means for controlling the speed of the moving body so that the relative speed becomes zero. Since the speed control means is provided, deformation of the cut surface of the molded body is unlikely to occur at the time of cutting, and therefore reworking is not necessary.

Since the conveying means is provided with the extrusion length measuring means for measuring the extrusion length of the molded body and the cutting length control means for starting the cutting when the measured value reaches a predetermined value, It can be cut exactly to the desired length.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the cutting device of the present invention will be described below with reference to the drawings. In FIG. 1, an uncured extrusion-molded body 1 is extruded from a vacuum extrusion-molding apparatus 3 to which an extrusion die 2 having a desired shape is attached. A take-up conveyer 4 which is connected to the extrusion die 2 and conveys the formed body while taking it out is installed, and a moving body 6 is provided on the cutting conveyer 5 separately from the conveyer. The moving body 6 can move in the extrusion direction.

The cutting conveyor 5 is provided with a moving body driving device 13 for moving the moving body 6 in the extrusion direction. The moving body driving device 13 is moved up and down so that a cutting rotary blade or the like can be moved up and down. Means are provided, and a concave portion is formed in the cutting conveyor so as not to come into contact with the cutting conveyor 5 during processing of the rotary blade. This concave portion can be moved together with the moving body 6.

The take-up conveyor 4 and the cutting conveyor 5 are driven in synchronization with the extrusion speed of the molded body. Further, a cutting means 7 and a relative speed measuring means 14 are attached to the moving body 6. The relative speed measuring means 14 is used for the moving body 6
And the relative speed of the molded body 1 is measured, and the moving speed of the moving body 6 is controlled so that the relative speed becomes zero. In this way, the moving body 6 is perfectly synchronized with the moving speed of the molded body.
Since the molded body 1 is cut to an arbitrary length by the cutting means 7 while moving the molded body 1, the molded body 1 can be cut straight. The cut molded body 1 moves on the transfer conveyor 8, is placed on the pallet 9, and is conveyed from the discharge conveyor 10 to the next step. After the cutting is completed, the cutting means 7 is raised and the moving body 6 returns to the initial position.

The control means for controlling the moving speed will be described. The signal input from the relative speed measuring means 14 is input to the relative speed control means 15 via the amplifier 16. Next, the control signal from the relative speed control means 15 is input to the servo amplifier 17, and the moving body drive device 13 for moving the moving body 6 in the extrusion direction by the servo amplifier 17 makes the relative speed between the moving body 6 and the molded body 1 zero. To be controlled.

The rotation speed of the moving body driving device 13 is
It is measured by the encoder 18 and fed back to the servo amplifier 17 and the relative speed control means 15. In this embodiment, LASER DOPPLER VELOCIMETER LV-102 manufactured by Mitsubishi Electric Corporation is used as the extrusion length measuring means 11 of the molded body 1 fixed on the take-up conveyor 4, and the molded body is manufactured using the same apparatus. The extrusion length of was detected. In this embodiment, the relative speed control means and the cutting length control means are the same device, but different devices may be used.

The measured value measured by the extrusion length measuring means 11 is output to the relative speed control means 15, and the relative speed control means 15 directs the moving body 6 when the extrusion length reaches a desired length. The cutting is performed by the attached cutting means 7. Further, as the relative speed measuring means 14 installed on the moving body 6, a laser type speed meter FC-2000 manufactured by KEYENCE Co., Ltd. was used.

As described above, by cutting the extruded body to a desired length by the cutting device, no external force acts on the extruded body, and therefore, the deformation in the vicinity of the cut surface of the extruded body is almost eliminated. Will not be recognized. Further, the cutting device is not affected by the external force along the extrusion direction.

[0026]

According to the cutting device of the present invention, the accuracy of synchronization between the moving speed of the moving body and the moving speed of the molded body is increased, and a good cut surface is formed, thereby manufacturing a molded body excellent in linearity. be able to. In addition, there is almost no deformation in the vicinity of the cut surface of the molded body, so it is not necessary to re-cut the end part in the finishing process, and at the same time, the load on the cutting device can be reduced and its durability can be improved. It is possible to improve efficiency and simplify the production process. Further, it becomes possible to accurately cut the molded body to a desired length.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a cutting device of the present invention.

FIG. 2 is an explanatory diagram showing an end shape of a molded body using a conventional cutting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extrusion molded body 2 Extrusion die 3 Vacuum extrusion molding apparatus 4 Take-up conveyor 5 Cutting conveyor 6 Moving body 7 Cutting means 8 Transfer conveyor 9 Pallet 10 Discharging conveyor 11 Extrusion length measuring means 13 Moving body driving device 14 Relative speed measuring means 15 Relative speed control means 16 Amplifier 17 Servo amplifier 18 Encoder

Claims (2)

[Claims] 1. A conveying means for conveying a molded body extruded from an extrusion die of an extruder, a movable body provided in the vicinity of the conveying means and movable in the extrusion direction, and attached to the movable body. Cutting means, relative speed measuring means attached to the moving body for measuring the relative speed of the molded body and the moving body, and relative speed control means for controlling the speed of the moving body so that the relative speed becomes zero. An apparatus for cutting an extruded body, comprising: 2. The extruding length measuring means for measuring the extruding length of the molded body is provided in the conveying means, and the cutting length control means for starting cutting when the measured value reaches a predetermined value. The apparatus for cutting an extruded product according to claim 1, characterized in that.