JPH06182802A - Transfer mold - Google Patents

Abstract

PURPOSE:To provide a transfer mold capable of easily replacing only the abraded part of a pot, unnecessary to perform the position adjusting work of a chase and capable of smoothly and certainly performing pot replacing work. CONSTITUTION:The flange part 22a of the lower pot member 22 of the pot 20 provided to the through-hole of an upper mold 1 is fixed to a center block 9 by the attaching and detaching operation of an attaching bolt 23 or the lower pot member 22 of the pot 20 is detached from the center block 9 to be replaced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer molding die for supplying a molten resin into a cavity by pushing out a resin tablet loaded in a pot with a plunger.

[0002]

2. Description of the Related Art Conventionally, as this type of transfer molding die, as shown in FIGS. 2 to 4, an upper die 1 and a lower die 2 are provided so as to be relatively movable. . The upper mold 1 and the lower mold 2 are respectively provided with the base plate 3,
4, template plates 7 and 8 are provided via spacers 5 and 6, and center blocks 9 and 10 and a plurality of sets (7) sandwiching the center blocks 9 and 10 are provided between these template plates 7 and 8.
(Chase 11) and chase 11 and 12 are attached. Then, a pot 13 is attached through the template 7 and the center block 9 and the resin tablet loaded in the pot 13 is pushed out by the plunger 14 to cause the center blocks 9 and 10 and the chase 11, Molten resin is supplied into the cavity formed between the chase 11 and 12 through the resin passage formed in 12. In the figure, reference numerals 15 and 16
Is an ejection mechanism for ejecting the molded product in the cavity.

[0003]

By the way, since the plunger 14 slides along the inner peripheral surface of the pot 13, the tool steel (for example, SKD11) is subjected to quenching and chrome plating treatment, or is made of cemented carbide. Although the wear resistance is enhanced by using an alloy, if the molding is repeated over a long period of time, the inner peripheral surface of the pot 13 is worn,
There is play between the plunger 14 and the plunger 14. When the backlash is generated between the pot 13 and the plunger 14 in this manner, a problem occurs that air is entrained in the molten resin supplied into the cavity, which adversely affects the quality of the molded product. When it wears, the center block 9 is removed from the template 7 and the pot 13 is replaced. However, originally, Chase 1 above
1 and 12 are for matching those engraved surfaces,
Since it is attached to the mold plates 7 and 8 so as to be slightly movable and adjustable, when the center block 9 is removed from the mold plate 7 as described above, the chase 11 inevitably shifts in the lateral direction, and the chase is reassembled at the time of assembling. Since the positions 11 and 12 must be aligned, the replacement work is complicated and the workability is extremely poor.

The present invention has been made in view of the above circumstances, and it is an object of the present invention that only the worn portion of the pot can be easily replaced without the need to adjust the chase position. The purpose of the present invention is to provide a transfer molding die capable of smoothly and reliably exchanging a pot.

[0005]

In order to achieve the above object, the present invention has a pot mounted in a through hole of a mold, a plunger is movably provided in the pot, and the pot is mounted in the pot. In a transfer molding die for supplying a molten resin into a cavity through a resin passage by pushing an inserted tablet by the plunger, an end portion of the pot on the resin passage side is fixed to a die body. The pot, which is fixed by, is composed of a plurality of pot bodies that can be divided into upper and lower portions.

[0006]

In the transfer molding die of the present invention,
By attaching and detaching the fastening means, the resin passage-side end of the pot mounted in the through hole of the mold is fixed to the mold, or the resin passage-side pot of the pot is removed from the mold. Exchange.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the present embodiment, parts having the same configurations as those of the conventional example shown in FIGS.

Reference numeral 20 in the drawing denotes a pot according to an embodiment of the present invention, and the pot 20 is composed of two pot bodies 21 and 22 which can be vertically divided. And, a collar portion 21a is formed at the lower end portion of the upper pot body 21,
The collar portion 21 a is engaged with the lower surface of the template 7. Further, a flange portion 22a is formed at the lower end portion of the lower pot body 22, and the mounting bolt 2 inserted through the flange portion 22a.
The lower pot body 22 is fixed to the center block 9 by screwing 3 into the center block 9. And these pot bodies 21 and 22 are mutually closely connected by the spigot structure.

In the transfer molding die constructed as described above, each center block is pushed out by the plunger 14 in the state where the resin tablet is loaded in the pot 20 as in the conventional case. The molten resin is supplied into the cavity formed between the chases 11 and 12 through the resin passages formed in the chase 11 and 12, and the molded product is molded in the cavity. When the inner peripheral surface of the pot 20 wears due to repeated molding and needs to be replaced, the wear is severe due to the clearance with the plunger 14, and it exclusively affects the entrainment of air into the molten resin. Only the lower pot body 22 is replaced. That is, in the mold open state, the mounting bolt 23 is removed and the lower pot body 2 is removed.
2 is pulled out from the center block 9, a new lower pot body 22 is attached and fixed by a mounting bolt 23. By doing so, it is not necessary to remove the center block 9 when replacing the pot 20, unlike the conventional case. Therefore, the replacement work can be performed easily and the chase 11, 12 can be replaced.
There is no need for alignment between them. Further, since it is possible to replace only the lower pot body 22, which is highly worn and exclusively affects the entrainment of air in the molten resin, it is extremely rational and easy to replace. Further, since the pot bodies 21 and 22 are closely connected to each other by the spigot structure, the resin does not leak from the connecting portion of both and the movement of the plunger 14 sliding inside is hindered. Never.

[0010]

As described above, according to the present invention, the pot is mounted in the through hole of the mold body, the plunger is movably provided in the pot, and the tablet loaded in the pot is the above-mentioned. In a transfer molding die for supplying molten resin into a cavity through a resin passage by pushing it out by a plunger, an end portion of the pot on the resin passage side is fixed to a die body by a fastening means. Is composed of a plurality of vertically separable pot bodies, and therefore the resin passage side end of the pot mounted in the through hole of the die body is attached to the die body by attaching and detaching the fastening means. By fixing or removing and replacing the pot body on the resin passage side of the pot from the mold, only the worn part of the pot can be easily replaced, and the position of the chase Adjusting work need not be performed, it is possible to perform the replacement operation of the pot smoothly and reliably.

[Brief description of drawings]

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

FIG. 2 is a front view of a conventional transfer molding die.

3 is a cross-sectional view of FIG.

FIG. 4 is an explanatory view of the upper die as viewed from the mating surface side.

[Explanation of symbols]

 1 Upper mold 14 Plunger 20 Pot 21 Upper pot body 22 Lower pot body 23 Mounting bolt

Claims (1)

[Claims] 1. A mold is provided with a pot in a through hole, a plunger is movably provided in the pot, and a tablet loaded in the pot is pushed out by the plunger to melt the molten resin. In a transfer molding die which is supplied into a cavity through a passage, an end portion of the pot on the resin passage side is fixed to a mold body by a fastening means, and the pot is divided into a plurality of pots that can be vertically divided. A transfer molding die characterized by being composed of a body.