JP3190479B2 - Cassette type nesting device for injection molds - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette type nesting / removing apparatus which is mounted on a fixed mold plate or a movable mold plate in an injection mold.

[0002]

2. Description of the Related Art Conventionally, a so-called cassette type mold in which a plurality of inserts are mounted on one mold has been adopted.
In such a mold of the cassette type, the size of the recess formed in the mold body to which the nest is mounted is precisely finished so as to match the outer size of the nest. For this reason, it takes time and effort to manufacture for fitting the concave portion of the mold body and the outer shape of the insert.

[0003] Then, when the insert is mounted in the concave portion of the mold main body and the molding material heated and fluidized is injected into the cavity formed between the fixed-side mold plate and the movable mold plate that are in contact with the mold. However, the dimensions of the inserted nest become large due to thermal expansion and the like, and as a result, it becomes difficult to remove the nest from the fixed side mold plate or the movable side mold plate as the mold body, and the step It takes a lot of time to replace.

[0004]

According to the present invention, in such a cassette type mold, it is not necessary to finish the production of the fitting portion between the mold body and the insert particularly precisely.
The thermal expansion of the nest makes it easy to remove from the fixed mold plate and movable mold plate as the mold body, and furthermore, the positioning of the nest when mounted on the fixed mold plate and movable mold plate. It is an object of the present invention to provide a means capable of accurately determining

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an injection molding method in which a nest having a product-shaped cavity is removably mounted in a recess formed in a mold body. In the mold, a gradient is formed in the mold body such that the guide portion in the insertion direction of the insert into the mold body becomes narrower from the outside toward the inside, and the slope corresponding to the mold body is opposed. It is characterized by being formed in a nest.

[0006]

[0007]

According to the structure of the present invention, the size of the nest can be reduced with respect to the recess of the mold body without necessitating finishing the contact surface between the recess formed in the mold body and the nest accurately. Even when finished, when the mold body and the insert are fitted, the positioning pin is located in the hole between the mold body and the insert, or
The sloped side surface of the mold body is guided to the sloped side surface to accurately position the mold body and the nest, and even if the nest is thermally expanded, the positioning pin or the formation is formed. The separation can be easily performed by the set gradient.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The cassette type insert / detachment / removal device of the present invention can be applied to a device using a cassette type insert in a fixed mold plate and a movable mold plate of a mold. The case where the insert is used for the template will be described.

FIGS. 1 and 2 show a cassette type nesting / removing device showing a first embodiment according to the present invention. An insert 1 having a cavity corresponding to a product part shape (not shown) is removably attached to a concave portion 2a formed in a mold body 2 as a fixed mold plate. In this case, the size of the insert 1 is finished to such an extent that the insert 1 can be freely mounted in the recess 2a of the mold body 2, and the size of the insert 1 and the size of the recess 2a of the mold There is no need for precise finishing that matches with

In order to perform positioning when the insert 1 is mounted on the mold body 2, in this embodiment, a contact surface between the insert 1 and the mold body 2 and an upper guide surface are provided. , Respectively, means for positioning are provided. First, a through hole 3a is formed on the end surface between the insert 1 and the mold body 2 on the mold body 2 side in a direction orthogonal to the end surface, and the through hole 3a is formed on the insert 1 side. Is formed with a short hole 4a communicating with the hole.

A through hole 3b is formed in the upper guide surface of the insert 1 and the mold body 2 on the mold body 2 side in a direction perpendicular to the guide surface. A short hole 4b communicating with the through hole 3b is formed. 5a and 5b are
From the ends of the through holes 3a, 3b of the mold body 2,
The knock pins are inserted into the through holes 3a and 4b and located in the through holes 3a and 4a and the through holes 3b and 4b.

Then, the insert 1 is inserted into the concave portion 2a of the mold body 2.
Is inserted, in order to fix the insert 1 in the concave portion 2a of the mold body 2, the knock pins 5a and 5b are inserted from the ends of the through holes 3a and 3b, and the knock pins 5a and 5b
The through holes 3a, 4a and the through holes 3b, 4b are aligned so that the through holes 3a, 4a and the through holes 3b, 4b are aligned.
Located within.

In this state, each mold body functions as a fixed mold plate or a movable mold plate, and the molding material heated and fluidized is supplied into the cavity formed in the insert. Has an allowance in the recess 2a of the mold body 2 and is positioned and positioned by the knock pins 5a and 5b. Therefore, the mold body is opened, a molded product is taken out, and the insert 1 is inserted into the recess 2a of the mold body 2. It is very easy to take it out of the box.

FIGS. 3 to 5 show a cassette type nesting / removing device as a second embodiment according to the present invention. The difference between the second embodiment and the first embodiment is that, instead of using a hole and a pin as the positioning means, the upper and lower abutting surfaces of the concave portion 2a of the mold body 2 to which the end face of the insert 1 is guided. A key is arranged between 2b ₁ and 2b ₂ and the contact surfaces 1a ₁ and 1a ₂ of the insert 1.

That is, U-shaped grooves 6a and 6b are formed on upper and lower contact surfaces 2b ₁ and 2b ₂ of the concave portion 2a of the mold body 2, respectively.
b is formed, the contact surface 1a _1, the 1a ₂ each nesting 1 facing the contact surface 2b _1, 2b ₂ of the upper and lower, are formed U-shaped grooves 7a, a 7b. Then, in order to position the insert 1 in the mold main body 2 in a state where the insert 1 is fitted into the concave portion 2a of the mold main body 2, between the U-shaped groove 6a and the U-shaped groove 7a, and Square keys 8a and 8b are inserted between the U-shaped groove 6b and the U-shaped groove 7b, respectively.
As shown in FIG. 5, a gap s is formed between the insert 1 and the contact surface of the mold body 2.

Therefore, the insert 1 attached to the concave portion 2a of the mold body 2 is fixed to the mold body 2 at a predetermined position, and the insert 1 thermally expands due to the presence of the gap s. In addition, removal from the mold body 2 can be easily performed.

FIGS. 6 and 7 show a cassette type nesting / removing device according to a third embodiment of the present invention. This embodiment is a modification of the second embodiment, in which U-shaped grooves 6a ₁ and 6b ₁ formed in upper and lower contact surfaces 2b ₁ and 2b ₂ of a concave portion 2a of a mold main body ₂ are formed. , The height of the recess 2
In FIG. 3, the gradient is provided so as to become smaller from the opening side to the back side.

Therefore, in order to position the insert 1 in the mold body 2, a U-shaped groove 6 a ₁ with a slope and a U-shaped groove 7 are provided.
between a, and respectively, the angular key 8a ₁ and grooves with the same slope and the groove 6a ₁ between the U-shaped groove 6b ₁ and U-shaped groove 7b which graded 6b ₁ horned key 8b ₁ carrying thereon an identical slope and are inserted. Other operations are the same as in the second embodiment.

FIGS. 8 and 9 show a cassette type nesting / removing device as a third embodiment according to the present invention. In this embodiment, the upper and lower contact surfaces 2c ₁ , 2c of the concave portion 2a of the mold body 2 on which the end surface of the insert 1 is guided.
₂ and the contact surfaces 1b ₁ and 1b ₂ of the insert 1 have a gradient that becomes narrower from the opening side of the recess 2a toward the back side.

In the embodiment, the two contact surfaces between the insert 1 and the mold body 2 are provided with a gradient. However, only one of the two contact surfaces is provided with a gradient, and the other contact surface is provided with a gradient. The surface may not have a gradient. In any case, nested 1
There is no need to finish the two contact surfaces of the mold body 2 with high precision, and the insert 1 can be easily attached to and detached from the concave portion 2a of the mold body 2.

[0021]

According to the structure of the present invention, the contact surface between the mold body and the insert does not need to be finished with high precision, and the insert mounted on the mold body is affected by thermal expansion. Also, there is an effect that the removal from the mold body can be easily performed, and the positioning of the insert with respect to the mold body can be easily performed.

[Brief description of the drawings]

FIG. 1 is a side view of a first embodiment showing a relation between a mold body and an insert according to the present invention.

FIG. 2 is a front view of the first embodiment of the present invention.

FIG. 3 is a side view of the second embodiment showing the relationship between the mold body and the insert according to the present invention.

FIG. 4 is a front view of a second embodiment of the present invention.

FIG. 5 is a sectional view of a main part of FIG. 3;

FIG. 6 is a side view of the third embodiment showing the relationship between the mold body and the insert according to the present invention.

FIG. 7 is a front view of a third embodiment of the present invention.

FIG. 8 is a side view of a fourth embodiment showing the relationship between the mold body and the insert according to the present invention.

FIG. 9 is a front view of a fourth embodiment of the present invention.

[Explanation of symbols]

1 nested 1a _1, a ₂ insert abutment surface 2 mold body 2a mold recess 2b ₁ of the body, b ₂ of the upper and lower formed in the recess abutment surface 3a through which, formed in b die body Holes 4a, b Holes 5a, b formed in the nested part Knock pin 6a, b U-shaped groove formed in the abutting surface of the concave part 7a, b U-shaped groove formed in the abutting surface of the nested part 8a, horned key with a b angle-shaped key 8a _1, b ₁ gradient

──────────────────────────────────────────────────続 き Continued on the front page (72) Motoyasu Murai 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Osamu Hamasaki 1-3-6 Nakamagome, Ota-ku, Tokyo No. Ricoh Co., Ltd. (56) References JP-A-4-135722 (JP, A) JP-A-2-9522 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45/26-45/44 B29C 33/00-33/76

Claims (1)

(57) [Claims] In an injection molding die, a nest having a product-shaped cavity can be removably mounted in a recess formed in the die main body. The injection molding metal characterized by forming a gradient such that the guide portion in the insertion direction of the child is narrowed from the outside toward the inside, and forming a gradient corresponding to the mold body on the opposing insert. Type cassette type nesting device.