JPS6085916A - Injection molding equipment - Google Patents

Abstract

PURPOSE:To enable to arrange insert parts into a cavity impression in a short period without necessitating a robot and to prevent a position of the insert parts in the cavity impression from slipping, by moving a plurality of insert parts in a parts' hole by moving an extrusion pin of the parts in a reciprocating manner in the direction of the cavity impression. CONSTITUTION:After separation of a movable metal mold 2 from a stationary metal mold 1 an ejector rod 7 is moved in the direction of an arrow (a), an ejector pin 12 is moved in a reciprocating manner in the direction of a cavity impression 3 through an ejector plate 8 and molded parts adhering to a wall surface of the cavity impression 3 and insert parts 18 unified with the molded parts is extruded. The ejector plate 8 moves an extrusion pin 19 of parts in the reciprocating manner further by pressing a movable plate 9, a plurality of the insert parts 18 arranged in a parts hole 16 in a line is moved in the direction of the cavity impression 3 and the insert parts 18 at the top most position is made to arrange in the cavity impression 3. In this instance, slippage of the position of the insert part 18 at the top most position in the cavity impression 3 is prevented through a stepped part 17 between a positioning device 21 and the parts hole 16.

Description

Detailed Description of the Invention Technical Field The present invention relates to a method of injecting molten thermoplastic or thermosetting resin into mold cavities of a fixed mold and a movable mold, solidifying the resin, and then transferring the resin from the fixed mold to the movable mold. The present invention relates to an injection molding device that takes out molded products at a distance.

BACKGROUND ART A known conventional injection molding apparatus is one in which a fixed mold and a movable mold are separated from each other, and an insert part is placed in a mold cavity of the movable mold by a robot placed outside the mold.

However, this injection molding apparatus requires a robot and has the disadvantage that it takes a long time because it requires multiple movements of the robot when placing the insert part in the mold cavity.

Purpose An object of the present invention is to provide an injection molding device that can place an insert part in a mold cavity in a short time without requiring a robot, and can prevent the insert part from shifting its position in the mold cavity. It is about providing.

Configuration Next, the configuration of the present invention will be explained based on illustrated embodiments.

In FIG. 1, reference numeral 1 indicates a stationary mold that is fixed at a predetermined position. A movable mold 2 is arranged so as to be movable in the direction of contacting and separating from the fixed mold 1.

A mold hole 3 is formed in the opposing parts of the fixed mold 1 and the movable mold 2. An injection hole 4 communicating with a mold cavity 3 is formed in the fixed mold 1 . A heated and melted thermoplastic resin is injected from a resin injection means (not shown) into the mold cavity 3 through the injection hole 4 .

A hole 5 is formed inside the movable mold 2. This hole 5 consists of a large diameter part on the side of the fixed mold 1 and a small diameter part having a stepped part. A hole 6 is formed in the rear wall of the movable mold 2 to communicate the hole 5 with the outside.

An ejector rod 7 is placed through the hole 6 of the movable mold 2. This ejector rod 7 is fixed to the mold I by a driving means (not shown) using hydraulic pressure or the like.
It is reciprocated in the direction of approaching and separating from K, that is, in the direction of arrow a and in the opposite direction. An ejector plate 8 is movably arranged in the hole. This ejector plate 8 is fixed to the tip of the ejector rod 7. A movable plate 9 is arranged in the large diameter portion of the hole 5 so as to be located on the fixed mold 1 side of the ejector plate 8.

A small hole 1o is formed in the movable plate 9. A small hole 11 is formed in the front part of the movable mold 2 to communicate the mold cavity 3 and the hole 5. A rear end portion of an ejector pin 12 is fixed to the ejector plate 8, and the ejector pin 12 is arranged to pass through a small hole 10.11.

Further, a small hole 13 is formed in the movable plate 9. A small hole 14 is formed in the front part of the movable mold 2, communicating with the hole 5 and opening at the front surface of the movable mold 2. Above ejector play) 8 has return pin 15
is fixed. This return pin 15 has a small hole 13.
14 is inserted therethrough.

The ejector rod 7, the drive means for reciprocating the ejector rod, the ejector plate 8, the ejector pin 12, and the return pin 15 constitute ejector means A.

The movable mold 2 is formed with a component hole 16 that communicates with the hole 5 and the mold cavity 3. A stepped portion 17 is formed between the tip and rear portion of the component hole 16, that is, at the intermediate portion. A plurality of insert components 18 can be placed at the front and rear parts of the component hole 16, respectively.

The rear end of a component ejecting pin 19 is fixed to the movable plate 9, and the tip of this component ejecting pin 19 is connected to the component hole 1.
It is movably arranged at the rear of 6.

A component supply hole 20 is formed at the rear of the component hole 16 in communication with the component hole 16 . A plurality of insert components 18 are stacked and accommodated in this component supply hole 20 . The insert components 18 in the component supply hole 20 are supplied to the component hole 16 one by one by their own weight or by elastic pressing force as the component ejecting pin 19 reciprocates.

At the tip of the component hole 16, a positioning means 21 is arranged on the wall. The positioning means 21 includes, for example, a ball 21b disposed in the opening of the cylindrical body 21a so as to be movable within a predetermined range, and a spring 21c urging the ball 21b outward. This positioning means 21 elastically aligns the insert part 18 which is in contact with the step part 17 of the part hole 16 among the plurality of insert parts 18 arranged at the tip of the part hole 16 against the wall surface on the step part 17 side of the part hole 6. Press it against the

A small hole 22 is formed in the front part of the movable mold 2, communicating with the hole 5 and opening at the front surface of the movable mold 2. A return bin 23 is fixed to the movable plate 9. This return pin 23 is arranged so as to pass through the small hole 22.

The movable mold 2 is separated from the fixed mold 1, and the component hole 1 is
6Vc With a predetermined number of insert parts 18 arranged and a plurality of insert parts 18 accommodated in the part supply hole 20, the movable mold 2 is clamped against the fixed mold 1 by mold clamping means (not shown). They are brought close together and pressed against the fixed mold 1 at a predetermined pressure as shown in FIG. In this case, even if the ejector bin 12 and the return pins 15, 23 protrude from the front surface of the movable mold 2, as the movable mold 2 moves, they approach and abut the fixed mold l, and then the return pins 15, 23 are relatively pushed toward the rear of the movable mold 2, so the return pins 15, 23, ejector plate 8,
The ejector rod 7, ejector pin 12, movable plate 9, and component ejecting pin 19 return to the standby position shown in FIG.

As shown in FIG. 1, with the movable mold 2 in pressure contact with the fixed mold 1, thermoplastic resin heated and melted by the resin injection means is injected into the mold cavity 3 through the injection hole 4. . The thermoplastic resin injected into the mold cavity 3 is cooled and solidified by the fixed mold 1 and the movable mold 2Vc. Pipes through which water passes are arranged in the fixed mold 1 and the movable mold 2, and water is supplied to these pipes, passes through the pipes, and is discharged to the outside. The water passing through these pipes releases the heat given from the resin to the fixed mold 1 and the movable mold 2 to the outside when the resin injected into the mold cavity 3 is cooled and solidified. and maintains the movable mold 2 at a predetermined temperature.

After the resin injected into the mold cavity 3 is cooled and solidified by the fixed mold 1 and the movable mold 2, the movable mold 2 is separated from the fixed mold 1 by a mold opening means (not shown). When the movable mold 2 is separated from the fixed mold 1, it moves together with the movable mold 2 with the finished product attached to the wall surface of the mold cavity 3 of the movable mold 2.

Next, after the movable mold 2 is separated from the fixed mold 1 by a predetermined distance, the ejector rod 7 is moved forward in the direction of arrow a, and the ejector plate 8 integral with the ejector rod 7 is moved forward.

When the ejector plate 8 is moved forward, the ejector pin 12 integrated therewith is moved forward in the direction of the mold cavity 3 to remove the molded product attached to the wall surface of the mold cavity 3 and the insert part 18 integral therewith. 1 to extrude and separate from movable mold 2
When the ejector plate 8 moves forward, it moves forward by a predetermined distance, and after the ejector pin 12 pushes out the molded product and the insert part 18 integrated therewith from the mold hole 3, it comes into contact with the movable plate 9 and pushes it out. Press to move forward. When the movable plate 9 is moved forward, the component ejecting pin 19 integrated with the movable plate 9 is moved forward and presses a plurality of insert components 18 arranged in a row in the component hole 16 in the direction of the mold cavity 3. and move the insert part 18 at the foremost position to be placed in the mold cavity 3.

Next, the movable mold 2 is moved to the fixed mold IV by the mold clamping means.
C is approached and contacted as shown in FIG. In this case, from the front surface of the movable mold 2, the turn bin 15.2
3 and the ejector pin 12 protrude, but the tip surfaces of the return pins 15 and 23 abut against the front surface of the fixed mold 1, and the return pins 15 and 23 are relatively pushed toward the rear of the movable mold 2. ejector plate 8.
, the ejector rod 7, the ejector pin 12, the movable plate 9, and the component ejecting pin 19 are moved back and returned to the standby position as shown in FIG. When the component ejecting pin 19 moves back, one insert component 18 accommodated in the component supply hole 16 is supplied to the component hole 16 by its own weight or by elastic pressing force.

When resin is injected into the mold cavity 3 in a state where the movable mold 2 is in pressure contact with the fixed mold IK, the positioning means 21 is moved to the stepped portion 1 of the component hole 16 at 5 as shown in FIG.
7, insert the insert part 18 in contact with the step part 1 of the part hole 16.
Since it is in pressure contact with the wall surface on the side 7, even if the resin injection pressure is applied to the insert part 18 located at the tip of the part hole 16, the movement of the insert part 18 in the direction of the movable mold 2 will be within the part hole 160 step. Since the insert part 18 is blocked by the portion 17, the position of the insert part 18 in the foremost position in the mold cavity 3 does not shift.

Note that the extrusion bin driving means B for reciprocating the component extrusion pin 19 is composed of an ejector rod 7, an ejector plate 8, a movable plate 9, and a return bin 23, but is not limited thereto; The rod 7 and the ejector plate 8 may be configured using another driving means.

Further, the present invention can also be applied to the case where a molded product is produced using a thermosetting resin.

Effects The injection molding apparatus of the present invention does not require a robot and can place one insert part into the mold hole with one movement of the part ejecting pin, so the insert part can be placed in the mold hole in a short time. Moreover, it is possible to prevent the position of the insert part in the mold cavity from shifting.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing the injection molding apparatus of the present invention;
FIG. 2 is a partially cutaway front view showing an enlarged main part of the injection molding apparatus of the present invention.

Claims (1)

[Claims] A fixed mold that is fixed at a predetermined position, a movable mold that is movable in contact with and away from the fixed mold, and a mold that is attached to the wall of the mold hole of the movable mold. ejector means for extruding a molded product that is in the movable mold; , a component supply hole that is formed to communicate with the rear part of the component hole and accommodates a plurality of stacked insert components; a component extrusion pin that is movably disposed in the rear part of the component hole; An extrusion pin driving means for reciprocating the pin, and an insert component that is in contact with the stepped portion of the component hole among the plurality of insert components arranged at the tip of the component hole, is elastically pressed against the wall surface on the stepped portion side of the component hole. After the ejector means extrudes the molded product in the mold cavity and the insert parts integral with the molded product from the mold cavity, the component ejecting pin moves toward the mold cavity so as to push out the plurality of parts in the mold cavity. Injection molding characterized by moving the insert parts, arranging the insert part in the foremost position in the mold hole, and supplying one of the insert parts to the part supply hole after the part extrusion pin moves back. Device.