JPH11198169A - Multiple transfer molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the penetration of air bubbles into a cavity by allowing the runner groove extending from one of adjacent charging chambers toward the cavity corresponding thereto and the runner groove extending from the other charging chamber toward the cavity corresponding thereto to communicate with each other on the way thereof. SOLUTION: A plurality of charging chambers 3a-3e supplying raw matdrial tablets A are provided to a lower mold 1 so as to be arranged in one row. By forming runner grooves 7a-7e into a dogleg shaped bent form, the runner groove 8a in the first charging chamber 3a among the respective charging chambers 3a-3e and the runner groove 7b in the second charging chamber 3b, the runner groove 7b in the second charging chamber 3b and the runner groove 7c in the third charging chamber 3c, the runner groove 7c in the third charging chamber 3c and the runner grove 7d in the fourth charging chamber 3d and the runner groove 7d in the fourth charging chamber 3d and the runner groove 7e in the fifth charging chamber 3e mutually communicate directly on the way thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermosetting synthetic resin transfer molding apparatus, and more particularly, to a multi-transfer molding apparatus for simultaneously molding a large number of thermosetting synthetic resin molded articles. It concerns the device.

[0002]

2. Description of the Related Art Generally, a multi-type transfer molding apparatus of this type is provided with a plurality of raw material tablet loading chambers in at least one of a pair of dies, and has a mating surface between the two dies. A plurality of molding cavities are provided so that at least one of the cavities communicates with the loading chamber via a runner groove, and the raw material lent supplied to each of the loading chambers is heated in each of the loading chambers. The molten synthetic resin is filled into each molding cavity through the runner groove and molded into a predetermined shape by simultaneously pushing the plunger after melting.

[0003] In this case, Japanese Utility Model Publication No. Sho 63-39054 as a prior art discloses a multi-type transfer molding apparatus in which a bypass passage communicating between two adjacent loading chambers of each loading chamber is provided. It is proposed that the quality of a molded product be made uniform by providing the molding pressure in each loading chamber.

[0004]

However, as in the prior art, the two adjacent charging chambers of the respective charging chambers are communicated with each other through a bypass passage so that the molding pressure in each of the charging chambers can be made uniform. It has been found that such a configuration as described above causes the following problems.

That is, when a plunger is simultaneously pushed into each of the loading chambers during transfer molding, each of the two loading chambers at both ends is provided in a bypass passage communicating between the two adjacent loading chambers. When the molten synthetic resin flows in from the same time, air is trapped in the bypass passage as air bubbles, and the air bubbles enter the molding cavity in the process of equalizing the pressure. Therefore, a defective product is generated in the cavity containing the bubble.

According to the present invention, in the multi-type transfer molding apparatus, the above-mentioned problem, that is, the introduction of air bubbles into the cavity can be reliably reduced after equalizing the molding pressure in each loading chamber. Is a technical issue.

[0007]

In order to achieve this technical object, the present invention provides a method for manufacturing a tablet, comprising: providing at least one of a pair of molds with a plurality of loading chambers for raw material tablets; On the mating surface of the mold, a plurality of molding cavities are provided such that at least one of these cavities communicates with the loading chamber via a runner groove,
In a multi-type transfer molding apparatus configured to simultaneously push a plunger into each of the loading chambers, a cavity corresponding to the one loading chamber from one of the two adjacent loading chambers may be provided. And a runner groove extending from the other loading chamber to a cavity corresponding to the other loading chamber is configured to directly communicate with each other in the middle thereof. ".

[0008]

Operation and effect of the present invention
During transfer molding, the plunger is simultaneously pushed into each of the loading chambers, and the molten synthetic resin in one of the two loading chambers adjacent to each other passes through a runner groove extending from the one loading chamber. Is filled into the cavity for the loading chamber, and the molten synthetic resin in the other of the two adjacent loading chambers is:
Since the cavities for the other loading chamber are filled through the runner grooves extending from the other loading chamber, it is necessary to prevent air from accumulating in the runner grooves from the respective loading chambers to the respective cavities. It can be reliably prevented.

A runner groove extending from one of the two adjacent loading chambers to the cavity for the one loading chamber, and a runner groove extending from the other loading chamber to the cavity for the other loading chamber. Means that the higher of the molding pressures in the two loading chambers is directly connected to each other in a state where air does not accumulate in the communicating portions of the two runner grooves because they are in direct communication with each other on the way. Since it is reliably transmitted to the lower side through both communicating runner grooves, it is possible to equalize the molding pressure between the respective loading chambers.

Therefore, according to the present invention, in the multi-type transfer molding apparatus, after equalizing the molding pressure in each loading chamber, it is ensured that air bubbles enter the cavity and defective products are generated. It has the effect of being able to be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this figure, reference numeral 1 denotes a lower die, and reference numeral 2 denotes an upper die. These two dies 1 and 2 are moved closer to each other by means not shown, as is well known in the related art. It is configured to reciprocate between a mold-matched state and a separated state.

The lower die 1 of the two dies 1 and 2 is supplied with a plurality of tablets (5 in this embodiment) for supplying the raw material tablet A.
) Loading chambers 3a, 3b, 3c, 3d, 3e are provided in a line, and these loading chambers 3a, 3b, 3c,
In 3d and 3e, plungers 4a, 4b, 4c and 4
d and 4e are slidably inserted. In this case, each of the plungers 4a, 4b, 4c, 4d, 4e is detachably attached to the movable member 5 at the lower end thereof, and the vertical movement of the movable member 5 simultaneously causes the respective loading chambers 3a. , 3b, 3c, 3d, 3e.

A large number of molding cavities 6a, 6b, 6 are provided on the left and right sides of the loading chambers 3a, 3b, 3c, 3d, 3e of the mating surfaces of the two dies 1, 2.
c, 6d, 6e are the loading chambers 3a, 3b, 3c, 3
A plurality is provided for each of d and 3e. In the case of the present embodiment, each of the loading chambers 3a, 3b, 3
Each of the four cavities 6a, 6b, 6c, 6d, and 6e is communicated with the outside of each of the cavities 6a, 6b, 6c, 6d, and 6e via runner grooves 7a ', 7b', 7c ', 7d', and 7e '. Cavities 6a ', 6b', 6 of the same shape
c ', 6d', and 6e '.

Furthermore, the mating surfaces of the two dies 1 and 2 are provided with the respective loading chambers 3a, 3b, 3c, 3d and 3e.
And a plurality of cavities 6a, 6b, 6c, 6 for each of the loading chambers 3a, 3b, 3c, 3d, 3e.
d, 6e, runner grooves 7a, 7b,
7c, 7d and 7e are provided. Each of the runner grooves 7a, 7b, 7c, 7d, and 7e is bent in a V-shape, so that each of the loading chambers 3a, 3b,
3c, 3d, 3e, the runner groove 7a in the first loading chamber 3a and the runner groove 7b in the second loading chamber 3b, and the runner groove 7b in the second loading chamber 3b and the third loading chamber 3c.
, A runner groove 7c in the third loading chamber 3c and a runner groove 7d in the fourth loading chamber 3d.
The runner groove 7d in the fourth loading chamber 3d and the fifth loading chamber 3
The configuration is such that the runner groove 7e in step e and the runner groove 7e communicate directly with each other on the way.

In this configuration, the raw material tablet A supplied to each of the loading chambers 3a, 3b, 3c, 3d, 3e of the lower mold 1 is heated and melted, and then plungers 4a, 4b, 4c, 4d. , 4e, the molten synthetic resin in each of the loading chambers 3a, 3b, 3c, 3d, 3e is turned into each of the loading chambers 3a, 3b, 3c, 3c.
Each of the runner grooves 7a, 7b extending from each of 3d, 3e,
7c, 7d, 7e and through each of the cavities 6
a, 6b, 6c, 6d, 6e, 6a ', 6b', 6
c ', 6d', and 6e 'will be filled.
Each of the cavities 6a, 6b, 6c, 6d, 6e, 6a ',
6b ', 6c', 6d ', 6e' each runner groove 7
Air can be reliably prevented from accumulating in a, 7b, 7c, 7d, 7e.

A runner groove 7a in the first loading chamber 3a and a runner groove 7b in the second loading chamber 3b, a runner groove 7b in the second loading chamber 3b, a runner groove 7c in the third loading chamber 3c, and a third loading chamber 3c. Groove 7c in the fourth loading chamber 3d and the runner groove 7d in the fourth loading chamber 3d.
Since the runner groove 7d in the loading chamber 3d and the runner groove 7e in the fifth loading chamber 3e are configured to directly communicate with each other in the middle thereof, each of the runner grooves 7a, 7b, 7c, 7d, 7e is formed. Each of the loading chambers 3a and 3a is in a state where air does not accumulate in the communication portion.
Since the higher one of the molding pressures in b, 3c, 3d, and 3e is transmitted to the lower one via the runner groove directly communicating with each other, the charging chambers 3a, 3b, 3
This makes it possible to equalize the molding pressure among c, 3d, and 3e.

In the above-described embodiment, each loading chamber and each runner groove are provided in the lower mold 1. However, the present invention is not limited to this, and Alternatively, each loading chamber and each runner groove may be provided, each loading chamber may be provided in the lower mold 1 or the upper mold 2, and each runner groove may be provided in the upper mold 2 or the lower mold 1. Needless to say.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention.

FIG. 2 is a plan view taken along the line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG.

[Explanation of symbols]

 1 Lower Die 2 Upper Die 3a, 3b, 3c, 3d, 3e Loading Chamber 4a, 4b, 4c, 4d, 4e Plunger 5 Movable Member 6a, 6b, 6c, 6d, 6e Cavities 7a, 7b, 7c, 7d, 7e runner groove

Claims (1)

[Claims] At least one of a pair of molds is provided with a plurality of raw material tablet loading chambers, and a plurality of molding cavities is provided on the mating surface of the two molds. At least one of the cavities is provided so as to communicate with the loading chamber via a runner groove, and a plunger is pressed into each of the loading chambers simultaneously. A runner groove extending from one of the two adjacent loading chambers to a cavity corresponding to the one loading chamber, and a runner extending from the other loading chamber to a cavity corresponding to the other loading chamber A multi-type transfer molding apparatus, characterized in that the groove and the groove are configured to directly communicate with each other in the middle thereof.