JPS598207B2 - Vacuum extrusion - manufacturing method for air-pressure molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an extrusion vacuum single-pressure molded product, and in particular, a process for forming a sheet-like article, a trimming process for a molded part, and a perforation process can be performed continuously on one line. The aim is to fully automate the production line by making it possible to

The method of manufacturing an extruded vacuum single-pressure molded product using resin or the like as a material generally includes a molding process of molding a sheet-like product extruded from an extruder, a process of trimming the molded part, and a process of drilling holes in the molded part. However, since the sheet-like material is extruded in a semi-molten state, conventionally, as shown in Fig. A molded part 1a that bulges out below the conveyance line 9 is formed by a pair of air pressure/vacuum molding molds 2 and 3 provided, and then the molded part 1a is formed by a pair of molds 2 and 3 disposed above and below the conveyance line 9. Trimming press mold 4,
It was trimmed by 5. However, as mentioned above, since the molded part bulges out below the line, in the next step, if the punching machines 6, 6, etc. try to make holes from below the line, the sheet-like material 1 will be damaged. There is a drawback that machining waste remains in the molding part 1a, and it is necessary to remove this waste after machining. Since the installation space for machines 6, 6, etc. is limited, there have been problems such as it sometimes becoming impossible to install them. Therefore, in the past, a drilling process was provided separately from the trimming process, and the trimmed molded part 1a was mounted upside down on separate drilling jigs T and 8, and a drilling machine was attached to the upper drilling jig T. 6 is provided, and the sheet material 1 is perforated by this perforator 6, and a hole 9 for dropping machining waste is provided in the lower perforation jig 8 to discharge the waste.

However, with this method, the molded part 1a that has been trimmed manually must be set in a punching device by an operator, which makes complete automation impossible, and increases the manufacturing cost due to the increase in equipment. This had the disadvantage of causing problems. The present invention has been made in view of the above-mentioned problems, and by forming a molding part that bulges above the line in the first step on the sheet-like product extruded from an extruder, the process of forming the sheet-like product, The trimming process and the perforation process of the molded part can be performed continuously on one line, making it possible to fully automate the production line, and also making it possible to perform the trimming process and the perforation process in one process. This feature is characterized by making it possible to downsize the equipment.

First, the basic structure of the present invention will be explained based on the principle diagram shown in FIG. 2. The present invention is based on the principle diagram shown in FIG. A pair of molds 12 and 13 for compressed air vacuum forming are used to form a molding part 11a that bulges above the line, and then in a second step, the molding part 11a is disposed above and below the conveying line 10. Trimming press mold 14,1
At the same time, the molded portion 11a is perforated from above the conveyance line 10 using a perforator 16 provided in the upper trimming press mold 14.

Next, embodiments of the present invention will be described with reference to FIGS. 3 to 5.

Incidentally, among the constituent elements in these figures, the same elements as those in the above-mentioned principle diagram (FIG. 2) are given the same reference numerals. In FIG. 3, reference numeral 17 denotes a new material supplying device, which supplies resin pellets that will become the material (new material) for the sheet-like material 11, here, for example, high-density polyethylene pellets, to a metering and mixing device 18. The new material, recycled material, and an appropriate amount of pigment are mixed in the device 18 and supplied to the extruder 19.

The materials kneaded by the extruder 19 are extruded onto the conveyance line 10 through the T-die 20 to form a sheet-like material 11.

This sheet-like material 11 is sent to a compressed air/vacuum forming machine 22 by a conveying device 21 while being maintained at a moldable temperature (here, 120° C.) or higher. In addition, during this time, the sheet-like material 11 can also be heated by the auxiliary heater 31 arranged above the conveyance line 10 as needed. The air pressure/vacuum forming machine 22 has a pair of upper and lower air/vacuum forming molds 12 and 13.

Both molds 12 and 13 are arranged above and below the conveyor line 10, the upper mold (upper mold) 12 is a female mold, and the lower mold (
The lower mold) 13 is formed into a male mold. Both molds 12, 13
The molded part 11a is bulge-molded on the sheet-like material 11 by
For example, the material is forcibly cooled to a temperature of 35° C. or lower by cooling devices 23, 23, etc., such as an air blower, and then conveyed to the trimming press device 24.

The trimming press device 24 has a pair of upper and lower trimming press molds 14 and 15, and both molds 14 and 15 are arranged above and below the conveyance line 10.

An upper mold (upper mold) 14 is formed into a female mold, and a lower mold (lower mold) 15 is formed into a male mold in accordance with the shape of the molding part 11a. As shown in FIG. 5, the forming part 11a conveyed to the trimming press device 24 is
5 is set on the lower mold 15, and then the upper mold 14 is lowered to sandwich the molded part 11a, and trimmed (external diameter removed) by the blades 14a, 15a (see Fig. 5) of both molds 14, 15. Do the following.

As shown in FIG.
... is installed.

The drilling machine 26 consists of a drilling punch 26a and a piercing cylinder 26b that operates the punch 26a. Punch 26a, 26
There are punch receiving holes 27, 27 in the lower mold 15 corresponding to a...
... are drilled, and each punch receiving hole 27, 27 communicates with an internal cavity 15a of the lower die 15, and the cavity 15a also serves as a fall passage for debris generated by the punching. When both molds 14 and 15 are set by lowering the upper mold 14,
The proximity switch 30 detects this state, and based on the detection signal, the piercing cylinder 26 of the piercing machine 26, 26...
b is activated, the punch 26a moves forward toward the lower mold 15, and punches a hole in the molded part 11.

At this time, the debris generated by the drilling is removed from the cavity 15a of the lower mold 15.
The waste is collected in the waste collection line further down the line. Then,
A vacuum cup 28 attached to the upper mold 14 operates to attract the molded part 11a that has been trimmed and punched, and pulls it up as the upper mold 14 rises.

When the upper die 14 has finished rising, the product take-out rotor 2
9 (see Figure 3) advances between the molds 14 and 15, and then the vacuum cup 28 deenergizes and blows out air.
The molded part 11a is dropped and accommodated on the rotor 29. Thereafter, the rotor 29 retreats, and the molded part 11a is conveyed by the rotor 29 to a stock location and stored there. On the other hand, the sheet-like article 11 from which the molded part 11a has been removed
is led to a crusher 32, crushed within the crusher 32, and supplied to the mixing and measuring device 18 as recycled material via a recovery line. When the rotor 29 retreats, the work lifting bar 25 rises again and returns to its original position, waiting for the next molding section 11a to be carried in.

As explained above, the present invention forms a molded part that bulges above the line in the first step on a sheet-like product extruded from an extruder, and then trims the molded part in the second step and also Since the forming part is perforated from above, the process of forming the sheet-like object, the process of trimming the forming part, and the perforating process can be performed continuously on one line, The effect of enabling complete automation of the manufacturing line is significant.

Furthermore, since the drilling process and the trimming process can be performed in one process, the equipment can be reduced and production costs can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a principle diagram of the manufacturing process of an extrusion molded product showing a conventional technique. FIG. 2 is a diagram showing the principle of the manufacturing process according to the present invention. FIG. 3 is a schematic diagram of a manufacturing process showing an embodiment of the present invention. FIG. 4 is a plan view of the trimming press mold. Figure 5 shows the X in Figure 4.
-X and YY sectional views. 10... Conveyance line,
11... Sheet-like material, 11a... Molding part.

Claims (1)

[Claims] 1. In the first step, a molded part that bulges above the conveyance line is formed on the sheet-like material extruded from the extruder, and then,
A method for manufacturing an extruded vacuum-pressure molded product, characterized in that in the second step, the molded part is trimmed and holes are punched into the molded part from above a conveyance line.