JPS6357200A - Method and device for cutting foamed body block - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a foam molded block cutting method and apparatus;
For more details, it is possible to automatically cut foam molded blocks,
The present invention relates to a method and device for cutting blocks of foamed molded products that enable significant labor savings and improved productivity.

"Prior Art and Problems" Conventionally, the methods for cutting foam molded blocks such as polystyrene, etc. A widely used method is to cut with electrically heated nichrome wire. For example, when cutting a foam block in the vertical direction, it is suspended between two electrode supports.

Using a device with one weight hanging from each end of a Nichrome wire, lift the weight upward in advance to move the Nichrome wire heated by an electric current upwards, and then lower the foamed molded body ',/-.
/7 is placed, and the Negro 5-wire is lowered and cut by the weight of the weight.

However, the melting temperature of foam blocks differs slightly depending on the resin type In, foaming ratio, etc. Therefore, depending on the foam block to be cut, the weight may be adjusted or the nichrome wire may be manually supported at a lower speed. In addition, since the nichrome wire is cut by descending, the nichrome wire is lowered and finished cutting, then moved upward again, and then lowered again for the next cut. This is a unidirectional cutting process, which involves the problem of low productivity. Furthermore, when the block is obtained, it is necessary to move the block under the nichrome wire, but it is extremely troublesome and time-consuming to move the block to obtain the specified cutting dimensions, and the product dimensions vary widely. value t
There is also the disadvantage of being a member.

"Means for Solving the Problems" As a result of intensive research to solve the above problems, the inventor of the present invention has developed a system that automatically cuts the nichrome wire each time it moves up and down and to a predetermined cutting size. The present invention has been achieved in that the work efficiency can be greatly increased by moving the foamed molded product block 1) L.

That is, the first aspect of the present invention is a method of cutting a foamed molded product block with a heated nichrome wire, in which the foamed molded product block is fed to a cutting section by a predetermined distance, and the heated nichrome wire is moved up and down at a predetermined speed. The second aspect of the present invention is a method for cutting a foam molded block, which is characterized by moving the foam mold block back and forth and cutting the foam mold block sequentially during each movement.
A pair of gripping parts that hold a certain length of nichrome wire at both ends are driven up and down by a motor at a predetermined speed.
Cutting 'A' of a foam molded block, characterized in that a cuffing part in which the nichrome wire is connected to a power source and a block piece ilH part for placing the cut block piece are provided in sequence. The content of each is ll.

To explain based on the drawings showing embodiments of the apparatus for carrying out the present invention, in FIGS. 1 and 2, the apparatus of the present invention has a block supply section (10 ), a cutting part (20) for cutting the block with heated nichrome wire, and a block piece mounting part (30) for placing the cut block pieces.
It consists of Foamed molded body block supply section (10)
A positioning control system is built into the support base (11). That is, a positioning feed screw or chain (not shown) connected to a drive source such as a servo motor or a pulse motor is provided with an extrusion plate (12) for extruding the foam molded block (1) forward. . (13)
is a sheet of slippery metal, such as a plastic rug, for pushing the block (1) forward by the extrusion plate (12). The extrusion plate (12) provided on the positioning feed screw or chain is moved a predetermined length from the starting position 1 (Ao), that is, the width (1a) of the target block 1 (1a).
d) intermittently moves forward 1 and reaches a predetermined position (At) f
: When the robot moves forward, it returns to the original starting position W(A,).

The cutting part (20) has a certain length of nichrome wire (2
A pair of gripping parts (22) gripping 1) at both ends are attached to a drive shaft (23), and the gripping parts (22) are moved on the drive shaft (23) at a predetermined speed by a motor (24). It is configured to move up and down.

FIG. 3 is an enlarged view of the gripping portion (22).
) is mounted on a non-conductive plate (40) by a pair of supporting plates (41) made of a conductive material such as brass so as to be rotatable in contact with each other. Two drums (42) (42) are pivotally mounted, and a nichrome wire attachment part (43) is provided above the drums. The drum (4
2) (42) each has a groove (44) approximately in the middle of the outer peripheral surface.
(44) is engraved. The nichrome wire (21) is inserted between the grooves (44) (44) of the drum (42) (42), passes through a spring portion (21a) for absorbing the elongation due to heating, and then reaches the nichrome wire attachment portion. (
43). (45) is a lead wire,
(23) is the drive shaft, (25) (25) is the grip part (2
2) are auxiliary shafts to prevent horizontal vibration when moving up and down on the drive shaft. As mentioned above, since the nichrome wire is inserted between the grooves of the two drums, it is possible to cut the vertical movement speed block of the nichrome wire, and the load and thermal expansion during cutting can cause crud in the nichrome wire. Even if the nichrome wire moves, the spring directly absorbs this curvature through the rotation of the drum, and the trajectory of the nichrome wire is determined by the groove, so there is no problem of the nichrome wire moving and interfering with cutting work. .

The block piece viiz part (30) is connected to the cutting part (
This is for placing the block pieces (1a) cut in step 20), and may be a simple flat plate-like platform, or may be a roller conveyor or the like.

In addition, in the cutting part (20), the grip part (2
The vertical movement speed of 2), that is, the movement speed of the nichrome wire (21), is determined by the melting temperature (
The speed is controlled to the optimum speed by the foaming ratio (expansion ratio, etc.), the temperature of the nichrome wire, etc., and the distance (distance M) during movement is also appropriately set by the height of the block (1). In addition, in the block supply section (10), the start position iZ (A6) of extrusion +ff1 (13) is determined according to the length of the foam molded product block (1) to be cut, and
) The distance that the extrusion plate (13) moves forward intermittently is determined according to (d) during cutting, and the speed is controlled through the controller (2) so that it is linked to the moving speed of the nichrome wire (21). Controlled by microcomputer and/or relay.

A flowchart for executing the above control n is shown in FIG. 4, and ePl to p+s indicate each step of the flowchart.

In the figure, from P2 to P, the starting position, moving distance, etc. of the extrusion plate are determined according to the size of the foam block to be cut, the cutting size, etc., and the type of resin of the foam block, The temperature, vertical movement speed, movement distance, etc. of the nichrome wire are set according to the foaming ratio, etc.

Next, the foamed molded body block is placed on the block supply section, and the extrusion plate is driven a predetermined distance at P4.

Determine whether or not the predetermined path # has been driven with Ps using f! If the extrusion plate has been driven a predetermined distance, the extrusion plate is stopped at P, and the nichrome wire gripped by the grip is driven (lowered) at P to cut the block.

P, prescribed! After confirming whether or not the nichrome wire has been driven, the drive of the nichrome wire is now stopped.

Next, drive the extrusion plate with pro, check whether it has been driven a predetermined distance with Pl+, then stop driving the extrusion plate with P and O.Next, drive (raise) the nichrome wire with PIS. After checking whether the block has been driven by a predetermined amount using the PIS, the driving of the nichrome wire is stopped using the PIS.

After that, the process moves to P4 extrusion plate driving again, and P4 to P9, P
Steps 10 to PIS are repeated a predetermined number of times, and when the cutting of the block is completed, the extrusion plate is moved to the original starting position, another block to be cut is placed, and the above steps are repeated to cut the block. Incidentally, for example, each of the block pieces (1a) to (1e) shown in FIG. It is also possible to program a program to cut one block with a width of d2, and then cut m blocks with a width of d2.

In the present invention, as shown in FIG.
It is a preferred embodiment to provide a small air compressor (46) for cooling the nichrome wire near ). That is, since the area around the gripping part does not directly take part in cutting the foamed molded block, by cooling this area, it is possible to prevent the nichrome wire from thermally expanding more than necessary.

FIG. 6 shows another embodiment B of the gripping part, in which a pair of support plates (41) (41) are protruded from a non-conductive plate (40), and the support plates (41) (41) Two large and small drums (42a) and (42b) made of a conductive material such as brass are rotatably attached to each other in contact with each other. Small drum (42b
) is positioned slightly forward of the large drum (42a), so that when the gripping portion is raised, the nichrome wire (21) is connected to the small drum (42b) from above by a block.
), but the contact between the nichrome wire (21) and the large drum (42a) is not hindered. (45) is a lead wire. Further, in this example, the support plates (41) (41) have a thin film on the upper side so as to sandwich the nichrome wire attachment part (43), and serve as a kind of protective cover.

``Action/Effect'' As with soft soil, according to the present invention, all you have to do is place the foam molded block in the block supply section, and the block will be automatically fed only during the specified cutting process, and the nichrome wire will move downward and upward. Cutting is performed sequentially each time the machine is moved, making virtually unmanned operation possible for the first time, and productivity is more than doubled, making it extremely useful.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the device of the present invention, and FIG. 2 is an explanatory diagram showing a state in which a foam molded body block is cut using the device of the present invention.
Fig. 3 is a perspective view showing the grip used in the present invention;
The figure is a flowchart for executing the control of the present invention, and FIG. 5 is another embodiment of the gripping section I! Perspective view showing Mr. Li, No. 6
Figures (A) and (B) show still another embodiment of the gripping part, with Figure 6 (A) being a front view and Figure 6 (B) being Figure 6 (
It is a XX sectional view of A). 1... Foamed molded body block, 1a... Block piece 2
...Controller 10...Block supply section 11...Support stand, 12...Extrusion plate 13
... Smooth sheet 20 ... Cutting section 21 ... Nichrome wire, 22 ... Gripping section 23
...Drive shaft, 24...Motor 25.
...Auxiliary shaft 30...Block piece mounting portion 40...Plate, 41...Support plate 42
, 42a, 42b...drum, 43...nichrome wire attachment part 44...groove, 4
5... Lead wire 46... Air compressor Figure 3 Figure 4 Figure 6 (A) "8 Figure 6 CB)

Claims (1)

[Claims] 1. In a method of cutting a foamed molded product block with a heated nichrome wire, the foamed molded product block is fed to a cutting section by a predetermined distance, and the heated nichrome wire is moved up and down at a predetermined speed. A method for cutting a foam molded block, characterized by moving it back and forth and sequentially cutting it during each movement. 2. A block supply unit that moves the foam molded body block forward by a predetermined distance, and a pair of gripping units that grip a fixed length of nichrome wire at both ends are driven up and down by a motor at a predetermined speed, A cutting device for a foamed molded block, characterized in that a cutting section in which the nichrome wire is connected to a power source and a block piece mounting section for placing cut block pieces are successively provided. 3. The gripping part consists of a nichrome wire attachment part provided on the plate and two drums that are rotatably attached to a pair of support plates in contact with each other and have grooves carved on their surfaces. 3. The cutting device according to claim 2, wherein the wire is inserted through the groove and attached to the nichrome wire attachment portion.