JPH0345780Y2 - - Google Patents

Description

[Detailed description of the invention] This invention uses a stationary mold to mold a large number of molded products with protrusions on the circumference, enlarged lower part, and undercuts in an intermittent rotary compression molding machine. This relates to a means for individually molding.

Conventionally, compression molding of molded products with undercuts on the periphery requires splitting the mold, making molding difficult with continuous rotary or intermittent compression molding machines where it is inappropriate to take out the mold. Ta.

The purpose of this invention is to eliminate the above-mentioned inconvenience by simple means and to enable molding in an intermittent rotary compression molding machine.

To explain the device of this invention with reference to the drawings, the molded product may be one with a protrusion 2 on the outer circumferential surface of the main body 1, as shown in the first drawing A and B, or a truncated conical shape with the lower part 3 of the main body 1 enlarged. It has an undercut.

Such molded products A and B must be made by splitting the molds.
The molded product cannot be removed from the mold.

Eight sets of hydraulic machines 5 are fixed on the hydraulic machines 5 of an intermittent rotary compression molding machine 4, each of which is installed on a lower plate, and a lower mold 6 that is moved up and down is placed upside down with a gentle slope. A medium-sized hole 7 having a frusto-conical shape is provided. Several medium holes 7 are drilled in a row, and a vertically divided vertically divided medium hole 8 having an inverted truncated conical shape is fitted into each medium hole 7.

The springs 9 and 10 are built into the upper and lower parts of the medium 8,
The medium mold 8 is compressed when it is pushed into the medium mold hole 7, and the medium mold 8 can be quickly divided by elastic force when pulled out from the medium mold hole 7.

Vertical grooves 11 and 12 are bored in the middle of the outer surface of the middle die 8, facing perpendicularly to the cut surface, and the tips of stoppers 13 and 14, which are fixed to the lower die 6 and have their tips inserted, are inserted into these. When the two are fitted together, the middle die 8 is prevented from rotating in the lateral direction, and the distance by which the middle die 8 (described later) projects above the lower die 6 is controlled.

Further, steel balls 15 and 16 pressed against springs 17 and 18 are made to face the lower ends 19 and 20 of the vertical grooves 11 and 12 from both sides of the lower die 6, so that when the middle die 8 protrudes above the lower die 6, the middle die The lower part of the middle mold 8 is elastically supported to prevent the middle mold 8 from floating out of the middle mold hole 7 due to vibration, and when the middle mold 8 is inserted into the middle mold hole 7, the lower edge 19,
20 so that it touches the top.

21 is an upper mold fixed to the upper plate 22 of the intermittent rotary compression molding machine 4, and when molded product A is molded, it is molded in the same way as in general molding. A male screw 24 is provided to lock the product A, and if the molded product is B, a throw screw is similarly provided to lock the molded products A and B to the push die 23.

Furthermore, the lower mold 6, which moves up and down, and the upper mold 21, which does not move up and down, each have a heating plate to heat the middle mold 8 and the upper mold 21.

This invention is based on a state in which the middle mold 8 descends to the lowest position, fits into the middle mold hole 7 of the lower mold 6, compresses the springs 9 and 10, and closes the division, as shown in FIG. Then, raw materials such as phenol and urea resin provided on one side of the intermittent rotary compression molding machine 4 are dropped and filled into the mold hole 8' using a portable raw material filling device 25.

The mold advances to Figure 3B, the mold is closed, and the raw material is heated and pressurized.

After the heating and compression process is completed, the lower mold 6 begins to descend and the mold is opened.At the beginning of mold opening, the molded product A,
B attaches to the push die 23 of the upper die 21 and does not descend.

At this time, in the medium size 8, the stop rods 13 and 14 are vertically grooved 11,
During the free movement reaching the lower ends 19 and 20 of the mold 12, the middle mold 8 attaches to the molded products A and B and stops descending, allowing the middle mold 8 to be divided.

While the molded products A and B are stopped, that is, the stop bars 13 and 14 of the middle mold 8 are connected to the lower ends 19 and 20 of the vertical grooves 11 and 12.
Since the middle mold 8 is pulled out from the inside of the middle mold hole 7 while in contact with the middle mold 8 and a gap is created between the middle mold 8 and the middle mold hole 7, the middle mold 8 is divided rapidly by the elastic force of the springs 9 and 10. , the molded products A, B and the mold hole 8' of the medium mold 8 are separated,
The middle die 8 is attached to the stopper rods 13, 1 of the lower die 6 in the state shown in the fifth figure.
4 and lowers a little along with the lower die 6.

At this time, the steel balls 15 and 16 are positioned below the lower end portions 19 and 20 of the vertical grooves 11 and 12 to prevent the middle die 8 from vibrating.

When the mold progresses to the point D shown in the third figure, if the molded products A and B are difficult to remove from the upper mold 21, a removal device 25' provided on one side of the intermittent rotary compression molding machine 4 is used. Rotate molded parts A and B slightly to perform preliminary removal operations.

Next, when the mold reaches E, the upper surface of the middle mold 8 is brought into contact with an abutment box 26 set on one side of the intermittent rotary compression molding machine 4. The impact box 26 allows the molded products A and B of the upper die 21 to pass without operating between the curved side plates 26' and 26'' which are concentric with the upper plate 22 on both sides, and the bottom plate 26'' Apply the protruding middle die 8 above the middle die hole 7 to the lower surface, automatically operate the switching valve (not shown) of the ram C, and move the lower die 6 up and down as shown by the arrow D in the third figure above and below the ram C. Then, the middle mold 8 is pushed into the middle mold hole 7, the divided middle mold 8 is brought into close contact, the springs 9 and 10 are compressed and reinserted into the lower mold 6,
It is lowered together with the lower die 6.

The medium 8 passes through the abutting plate 26 and reaches the position 2. During this time, the steel balls 15 and 16 are in the vertical grooves 11 and 12.
The inner lower end portions 19 and 20 are in contact with each other to prevent the middle mold 8 from floating out of the mold hole 7 due to vibration from the abutting plate 26.

When the mold advances to the bottom, the upper mold 21 faces onto the stationary receiving plate 27, and the molded products A and B are removed by the removal device 28 set on one side of the intermittent rotary compression molding machine 4.
is removed and the mold returns to position A, completing the molding cycle.

In the above operations, A, C, and E are performed while the mold is stopped.
Others are operated while the mold is rotating.

This idea is as described above, and the middle mold 8 is made into an inverted truncated conical shape and split vertically, and the middle mold 8 is inserted into and removed from the middle mold hole 7 of the same shape as the middle mold 8 of the lower mold 6. Therefore, it is easy to divide the middle mold 8, and when the middle mold 8 is returned to its position, it is ensured that they are in close contact with each other, and this can be done quickly and automatically. , there is a great effect that molding can be performed with high efficiency.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of the molded product, Figure 2 is a cross-sectional plan view of the equipment, Figure 3 is a developed view of the equipment, Figure 4 is a vertical sectional side view of the lower mold and middle mold, and Figure 5 is the division of the middle mold. FIG. 6 is a cross-sectional view of FIG. 4, and FIG. 7 is a perspective view of the impact plate. A, B...molded product, 6...lower mold, 8...middle mold,
9, 10...Medium-sized spring, 11,12...Vertical groove,
13, 14...stop rod, 15,16...steel ball, 1
7, 18... Steel ball spring, 19, 20... Lower end of vertical groove, 21... Upper mold, 26... Impact box.

Claims (1)

[Scope of utility model registration request] A medium-sized hole 7 in the shape of an inverted truncated cone is provided in the lower mold 6 fixed on the hydraulic machine 5 of the intermittent rotary compression molding machine 4,
An inverted truncated conical medium 8 which is equal in shape to the medium hole 7 and split vertically in half is fitted so as to be retractable, and a longitudinal groove 1 is formed in the outer middle of the medium 8 so as to face perpendicularly to the cut surface.
1 and 12 are provided, and the tips of the retaining rods 13 and 14, which are fixed and inserted into the lower die 6, are fitted into these, and the middle die 8 is formed.
Mold holes 8' of molded products A and B with undercuts
are provided so that the molded products A and B are attached to the push mold 23 of the upper mold 21 fixed to the upper plate 22 of the intermittent rotary compression molding machine 4 when the mold is opened, and the molded products A and B are attached to the upper and lower parts of the middle mold 8 when the mold is opened. The springs 9 and 10 that divide this are built in, and the stop rods 13 and 14 are inserted into the vertical groove 1 at the beginning of mold opening.
The middle mold 8 is moved freely between the upper end portions 1 and 12 and the lower end portions 19 and 20 to stop the lowering of the middle mold 8, and the middle mold 8 is allowed to escape onto the middle mold hole 7, and is divided by the springs 9 and 10 to form the molded products A and B.
is removed from the mold hole 8', and then the middle mold 8 is attached to the stopper rods 13,1.
After the mold is opened, the middle mold 8 that has escaped onto the lower mold 6 is brought into contact with the impact box 26 set on one side of the intermittent rotary compression molding machine 4, and the lower mold 6 is lowered.
Push it in and reinstate it, making vertical grooves 11 and 12 in the lower die 6.
A compression molding apparatus for thermosetting resin molded products with an undercut, in which steel balls 15 and 16 facing the lower part of the mold and pressed by springs 17 and 18 are provided, and the lower part of the medium mold 8 is supported by these balls.