JPS59209824A - Manufacture of foamed body - Google Patents

Abstract

PURPOSE:To obtain readily a foamed body that has a prescribed size and is high in bonding strength at the welded section, by employing separated tables that have a function for adjusting size, and welding separate foamed bodies as well as adjusting the size of the welded foamed bodies simultaneously. CONSTITUTION:A table 8 is moved in a direction indicated at an arrow A by actuating an air cylinder 11. When the tip of a bolt 17 abuts against a bolt stopping plate 20, the table 8 is stopped, and at this time a heating device 32 is inserted for a moment between ends 36, 36 of separate bodies 35, 35 by the operation of an air cylinder 33 to melt the ends 36, 36 by the heat. After the heating device 32 is raised, the stopping plate 20 is lowered by actuating an air cylinder 21, the bolt 17 is disengaged from the stopping plate 20, and the table 8 is moved further in the direction indicated at the arrow A by actuating a piston shaft 12, and a bolt 28 of a stopper 25 is abutted against a bolt stopping plate 31 so that the movement of the table 8 is stopped. At this time, the ends 36, 36 of the separate bodies 35, 35 are welded by force.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a foam with good one-dimensional accuracy.

An example of a foam that requires strict dimensional accuracy is core material for automobile bumpers.

In recent years, synthetic resin foams have come to be used as core materials for automobile bumpers due to their advantages such as light weight.

The present applicant previously filed an application for a manufacturing method for obtaining a bumper core material with good dimensional accuracy by heat-sealing a plurality of divided bumper core material segments made of indoor molded bodies of foamed synthetic resin particles. This is done after the opposing ends of the divided body are melted by a heating tool.

The present invention relates to a method of welding the ends together by pressing the ends together. but.

If too much pressure is applied during welding, the ends of the divided bodies will be compressed and fused together, resulting in a core material for the bumper that is shorter than the specified length, and the two parts will be pushed in opposite directions. Unless pressure is applied, complete fusion cannot be achieved, and there is still room for improvement.

The present invention relates to improvements in the above technology.

In the present invention, a divided mounting table having a dimension adjustment function is used as a toilet tank, and the divided body is placed on the divided mounting table.

The dimensions of the core material are adjusted at the same time as the divided bodies are fused to each other, and the conventional problems caused by too much or too little pressing force during fusion can be solved.

As a result, it is possible to easily obtain a foam having predetermined dimensions and having good fusion strength at the fused portion.

That is, in the present invention, an adjustment device is provided on at least one of the divided mounting tables that face each other, and divided bumper core material divided bodies are placed on the divided mounting bases, and the opposing ends of the divided bodies are adjusted to each other. After heating and melting with a heating tool, move the divided mounting bases facing each other so that the ends press each other, and at the time of the movement, bring the adjusting devices into contact with each other, or the adjusting device and the adjusting device. The moving distance between the two divided loading tables can be adjusted by bringing the opposing divided loading tables into contact with each other.

Therefore, the gist of the present invention is to provide a method for producing a foam which is characterized by fusing the ends of the divided bodies to obtain a foam having predetermined dimensions.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, in which a case where a core material for a bumper is manufactured as a foam body will be described.

FIG. 2 shows a manufacturing apparatus used in manufacturing two foams in the present invention.

The manufacturing apparatus is composed of a divided mounting table, a table 4.8, and frames 5 and 9 made of, for example, wooden molds.

Further, the manufacturing device is composed of an expansion and fixing part 1 and a moving part 2,
The fixed part t consists of the table 4 fixed to a frame 3 made of, for example, a steel frame, and the frame 5 fixed to the upper surface of the table 4. The moving part 2 is provided with two guide shafts 6, 6 whose both ends are fixed to the 7-frame 3.
Four sliding pieces 7 are provided so as to be able to slide on them, and the table 8 is fixed to the upper surface of the sliding pieces 7. The frame 9 is fixed to the upper surface of the table 8. Although the divided mounting table in the manufacturing apparatus consists of a fixed part and a moving part, the two-divided mounting table does not necessarily have to be made up of a fixed part and a moving part.

A split mounting table may be used in which both sides are movable. Te 1
- One end of the bracket 10 is fixed to the bottom surface of the bull 8,
At the other end of the bracket 1o is a piston shaft 1 whose one end is fitted into an air cylinder 11 fixed to the frame 3.
The other end of 2 is attached.

Reference numeral 13 denotes a heat melting adjustment device, and the device 13 consists of an adjustment tool 4 provided at one end of the table 8, and an adjustment tool 15 provided on the side surface of the frame 3 opposite to the adjustment tool 14. . The adjustment tool 14 has a support rod 16, a bolt 17, and a nut ring 8, which are disjoint. is screwed into the screw hole and fixed to the support rod 16 with a nut 18. The adjustment tool 15 is provided with a plate-shaped bolt stop plate 2o that is provided so as to come into contact with the tip of the bolt 17 of the adjustment tool 14.

The other end of a piston shaft 22, one end of which is fitted into an air cylinder 21, is attached to an end of the stop plate 20.

23 is a guide body that guides the sliding movement of the port stop plate 2o.

As shown in FIG. 1, a fusion adjustment device 24 is provided at a position parallel to the thermal melting adjustment device 13.

The adjusting device 24 is connected to the table 8 similarly to the adjusting device 13 described above.
stopper 25.2 at one end and the side of the frame 3, respectively.
6 is provided. One stopper 25 is provided with a support rod 27, a bolt 28, and a nut 29.
is provided protruding below the end of the table 8, and the threaded shaft portion 30 of the bolt 28 is screwed into a screw hole of the support rod 27 and fixed to the support rod 27 with a nut 29. The other stopper 26 is a plate-shaped bolt stopper plate 3I), and the stopper plate 31 is fixed to the side surface of the frame 3.

32 is a heating tool, and the heating tool 32 is attached to the other end of the piston shaft 34, one end of which is fitted into the air cylinder 33.

The table 4 provided in the fixed part 1 and the table 8 provided in the movable part 2 are provided facing each other, and therefore the frames 5 and 9 fixed to the table 4.8 also face each other. It is provided.

Each of the frames 5 and 9 has a bumper core material division body 85.
35 is attached, and the divided body 85. The opposing ends 8g and 86 of the '35 are provided with a tapered portion 37 to prevent the occurrence of cracks during welding. Reference numeral 38 denotes a protrusion, and the protrusion 38 is provided for fixing the divided body 35.35 to the frame body 5.9 as required.

The materials for the bumper core segment 35.35 include polypropylene foam and polyurethane foam.

Polyethylene foam, polystyrene foam, etc. are used, and polypropylene foam is particularly preferred.

Next, a method for manufacturing the bumper core material of the present invention will be explained.

As shown in FIG. 2, a split bumper core material body 35 is attached to a pair of opposing frames 5 and 9. ．． 35 respectively. Next, the air cylinder 11 is operated, and the piston shaft 12. Move the bracket 0 to move the table 8 in the direction of the table 4 (in the direction of arrow A) where the fixed part is blind. When the tip of the bolt 17 comes into contact with the bolt stop plate 2°, the table 8 stops, and at this time, the heating tool 32 is instantaneously moved between the multi-divided body 35, 85 ends 86 and 36 by the operation of the air cylinder 33. inserted 9
The ends 36.36 of the divided bodies 35.35 are expanded and melted. After the heating tool 32 is raised, the bolt stop plate 2° is lowered by the operation of the air cylinder 21, the bolt 17 is removed from contact with the stop plate 20, and the table 8 is further fixed by the operation of the piston shaft 12. 3, the bolt 28 of the stopper 25 comes into contact with the bolt stop plate 31 of the stopper 26, and the table 8
stops moving. At this time, the end 36 of the two-part body 35 presses the end 36 of the divided body 35 of the fixed part 1.

By fusing, a core material 39 for a bumper is obtained as shown in FIG.

The bolt 28 of the stopper 25 is made to protrude in advance in the direction of the bolt stop plate 31 beyond the support rod 27 by a predetermined protrusion length, and the distance between the bolt 28 and the stop plate 31 is adjusted.
8 comes into contact with the stop plate 3I.

When the ends 36, 3B of the divided bodies ss, ss are fused together, the ends 36, 36 of the one divided body 85, 35 are not compressed excessively.

In addition, since the distance between the bolt I7 and the bolt stop plate 20 is adjusted by making the bolt 11 of the adjustment tool 14 protrude by a predetermined length from the support rod 16 in the direction of the bolt stop plate 20, the bolt 17 is moved toward the bolt stop plate 20. At this time, the heating tool 32
When the ends 36, 36 of the divided body 35 and 35 are thermally melted together, the ends 36 of the two divided bodies 85 and 35. Both $6 are thermally fused well.

In the above embodiment, the thermal melting adjustment device 13 and the fusion adjustment device 2
4 are provided between the table 8 and the frame 3, respectively, but they may be provided between the table 4 and the table 8 or between the frame body 5 and the frame body 9 in other embodiments of the present invention.

In the above embodiment, one pair of frames is provided, but as another embodiment of the present invention, a plurality of pairs of frames may be provided.

Further, in the above embodiment, one set each of the thermal melting adjustment device 13 and the fusion adjusting device 24 were provided only on one side of the divided mounting table, but in another embodiment, the thermal melting adjustment device 13 and the fusion adjusting device 24 were provided on one of the divided mounting tables. may be provided, and a fusion adjustment device may be provided on the other divided mounting table.

Further, in the above embodiment, one set each of a heat melting adjusting device and a fusion adjusting device are provided as adjusting devices;
As another embodiment, a pair of adjusting devices having a simple structure consisting of protrusions (for example, bolts) and fasteners (for example, nuts) may be provided on a divided mounting table.

Further, a plurality of adjustment devices may be provided on a pair of tables or a pair of frames, or one adjustment device may be provided on only one of the pair of tables or a pair of frames.

When one adjustment device is provided on only one of the pair of frames, the adjustment device comes into contact with an appropriate location (for example, the opposing wall) of the other frame.

In the above embodiment, the adjusting tool 4 and the stopper 25 are provided with threads on the shank portions 19, 30 of the bolt blinds 7, 28 to adjust the length of the protrusion beyond the support rods 16, 27. As an embodiment, the adjusting tool 14 and the stopper 25 are provided with a recess or a convex part in the shaft parts 19, 3G of the bolt 17.28, and a convex part or a convex part in the support rod 16.27.
The length of the protrusion can also be adjusted by elastically engaging the concave and convex portions and sliding them. In this case, the adjustment tool 14 and the stopper 25 are preferably made of a flexible material (for example, an adjustment tool obtained by injection molding a flexible synthetic resin).

As explained above, (1) the present invention uses a divided mounting table with a dimension adjustment function to fuse the two foam segments together and at the same time adjust the dimensions of the foam. Even if the nine foam body segments are mutually compressed excessively, there will be no excessive shrinkage. Furthermore, since it is possible to avoid loss of pressure force during fusion, defective fusion of the two foams is less likely to occur.

Therefore, according to the present invention, when the eight foams have a predetermined size without any variation in size, and the fused portion is movable,
It is effective no matter what.

[Brief explanation of the drawing]

The drawings show a case where a core material for a bumper is manufactured as an embodiment of the present invention, and FIG. 1 shows the present invention. The side view of the manufacturing device used when manufacturing a foam. Figure 2 is a vertical sectional view taken along the line ■-■ in Figure 1, Figure 3 is a vertical sectional view taken along the line ■-■ in Figure 1, and Figure 4 is a longitudinal sectional view taken along the line ■-■ in Figure 1. He is a strabismus prisoner. Goose-111 fixed part 2-m-movable part 4.8----Table 5.9-・-Frame 13=-
(1) Heat melting adjustment device 24--1 (1) Fusion bonding adjustment device
32------One heating tool 35------Core material division body for bumper 36------One end portion 3L------Core material for bumper

Claims (1)

[Claims] An adjustment device is provided on at least one of the opposing divided mounting tables, the foam segment is placed on the segmented mounting base, and the opposing ends of the segment are heated and melted using a heating tool. , move the split mounting bases facing each other so that the end portions press each other, and at the time of the movement, bring the adjustment devices into contact with each other, or bring the adjustment device and the split mounting base facing the adjustment device into contact with each other. (adjusting the moving distance between the two divided mounting tables, thereby fusing the ends of the divided bodies to each other to obtain a foamed body having predetermined dimensions. Production method.