JP3397690B2 - Inner die pulling mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner die drawing mechanism in a molding die used for injection molding a plastic pipe joint, a drainage basin or the like.

[0002]

2. Description of the Related Art As shown in FIG. 16, a drainage basin (1) made of plastic, for example, has a receiving port (3) of an inspection tube formed in an enlarged diameter at the upper end and a drainage port (4) at the lower end. In the curved pipe part (2), the convex ring part (3A) with the packing groove (3B) formed inside is formed in the upper part of the receiving part (3), and the lower side of the receiving part (3) On the side surface of the curved pipe part (2), pipe connection parts (5, 6, 7) are formed, and a seat tube part (8) is formed downward. To mold the drainage basin (1) having such a mouth part (3),
Conventionally, for example, an inner mold (51) and an outer mold (52) as shown in FIG.
An injection mold (50) having a is used. The inner mold (51) is composed of a receiving part inner mold (51A) and a remaining inner mold (51B), and the receiving part inner mold (51A) has an expanding / contracting diameter core (53) for forming packing grooves.
Is loaded. The expansion / contraction diameter core (53) is expanded or contracted by the expansion / contraction diameter guide (54). Further, the inner part of the receiving part (51A) has a tapered connecting part from the outside.
Sliding board (56) is connected through (55), and the expansion / contraction diameter guide (54)
The sliding board (58) is connected to the outside through the connecting rod (57),
The above two sliding boards (56, 58) are supported in the sliding frame (59),
A drive source such as a hydraulic cylinder (not shown) slides forward and backward in the sliding frame (59) as shown by arrows in FIG.

In the injection-molding die (50) having the above-mentioned structure, first, as shown in FIG. 18, the sliding board (58) is driven in the receiving portion (3) of the molded drainage basin shown in FIG. The expansion / contraction diameter guide (54) causes the expansion / contraction diameter core (53) to contract and slide it away from the packing groove (3B).
Next, as shown in FIG. 19, the sliding disc (56) is slid in the direction of arrow (a) by the drive source to pull out the inner mold (51A) of the receiving part from the receiving part (3). ) And the drive source of the sliding board (56) are synchronized to make the sliding speeds of the sliding board (58) and the sliding board (56) coincide.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In (50), there is a drive source for the sliding plate for pulling out and inserting the die in the receiving part, and a drive source for the sliding plate for sliding the expansion / contraction diameter guide for the expansion / contraction diameter of the expansion / contraction diameter core. Since it is necessary to separately provide each of the drive sources and to drive both drive sources synchronously, the structure is complicated and the device is expensive.

[0005]

[Means for Solving the Problems] As a means for solving the above conventional problems, the present invention comprises a sliding board (18) and a leading board (19) interconnected in a sliding frame (23). Is slidably supported, and a drive sliding plate (20) is slidably interposed between the sliding plate (18) and the leading plate (19). Is the inner mold of the mouth part that molds the inner shape of the mouth part (3) to be molded
(11A), and the drive slide plate (20) is connected to the inner mold (1
The expansion / contraction diameter guide (14) for expanding / contracting the expansion / contraction diameter core (12) for molding the packing groove (3B) loaded in 1A) is connected, and the expansion / contraction diameter guide is rotated by forward and reverse rotation of the screw rod (28). (14) slides through the drive sliding plate (20) in the direction of expanding or contracting the expansion / contraction core (12), and the leading plate (19) is the drive sliding plate (20). It is intended to provide an inner die withdrawal mechanism that slides the sliding plate (18) integrally by being propelled to the inner die (11A) from the formed mouth (3). In a preferred embodiment of the present invention, the expansion / contraction diameter core (12) is a plurality of fan-shaped cores.
(12A) and a plurality of trapezoidal cores (12B) interposed between the plurality of fan-shaped cores (12A), each core (12A, 12B)
The T-shaped engaging protrusions (121A, 121B) of the root end of the are respectively slidably fitted in the guide dovetail grooves (14A) provided on the peripheral surface of the expansion / contraction diameter guide (14), The guide dovetail groove (14A) is inclined so as to spread in the drawing direction of the inner mold.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in FIGS. The mold (9) shown in the figure is a mold for molding the drainage basin (1) shown in FIG. 16, and the mold (9) is composed of an outer mold (10) and an inner mold (11). The outer mold as shown in
(10) is divided into a lower mold (10A) and an upper mold (10B).
The inner mold (11) is a socket inner mold (11A) and a curved pipe inner mold (11B)
And a straight part inner mold (11C) and a pipe connection part inner mold (11D) .The receiving part inner mold (11A) is loaded with an expansion / contraction diameter core (12) for forming packing grooves. In addition, an expansion / contraction diameter core (13) for molding a recess of the connecting portion of the pipe connecting portion is loaded in the end portion of the curved pipe inner die (11B) on the side of the receiving portion.

The expansion / contraction core (12) for forming the packing groove is composed of four fan-shaped cores (12A) and four trapezoidal cores (12B) as shown in FIGS. 3 and 4. T-shaped engaging protrusions (121A, 121B) are formed at the root ends of the cores (12A, 12B). The fan-shaped cores (12A) and the trapezoidal cores (12B) are guide dovetail grooves provided alternately on the peripheral surface of the expansion / contraction diameter guide (14).
The engaging protrusions (121A, 121B) are slidably fitted in (14A, 14B), respectively.

As shown in FIGS. 5 and 6, the core (12
Although the guide dovetail grooves (14A, 14B) of (A, 12B) are both inclined so as to spread in the inner die drawing direction, the guide dovetail groove (14A) of the fan-shaped core (12A) shown in FIG. The tilt angle θ ₁ is shown in FIG.
As shown in FIG. 11, the inclination angle θ ₂ of the guide dovetail groove (14B) of the trapezoidal core (12B) is set to be smaller (θ ₂ > θ ₁ ).

As shown in FIG. 7, the expansion / contraction core (13) for molding the recessed portion of the pipe connecting portion has a claw shape, and has a molded product (1).
The number of pipe connection parts (5,6,7) provided in (drainage basin) (three) is prepared, and a T-shaped engaging protrusion ( 131) are provided, and the engaging protrusions (131) are slidably fitted in the guide dovetail grooves (15A) of the expansion / contraction diameter guide (15) similar to the expansion / contraction diameter guide (14) for forming the packing groove. Has been done.

The inner die (11A) of the receiving part is attached to a sliding plate (18) through a connecting part (17), and the sliding plate (18) is a molded product.
The axis of rotation (2) that matches the center of curvature of the curved pipe section (2) of (1)
It is slidably supported in a U-shaped sliding frame (23) installed on the rotating base (22) that rotates around 1),
As shown in FIG. 8, the sliding plate (18) of the receiving part internal type (11A) is connected to the leading plate (19) slidably supported in the sliding frame (23) and the connecting plate (24, 25). , 26). Then, the bending pipe inner mold (11B) is connected to the front plate (23A) of the sliding frame (23) by a connecting pipe.
It is connected via (16).

As shown in FIG. 9, the sliding plate (18) and the leading plate
A drive sliding board (20) is interposed between the sliding board (20) and the leading sliding board (19) of the internal die (11A) of the receiving part. A connecting pipe (27) connecting with () is loosely fitted, and a ball screw (28) which is a screw rod is screwed to the drive sliding plate (20).

A gear (29) is attached to the root end of the ball screw (28), and the gear (29) meshes with the gear (30) of the shaft of the hydraulic motor (31). The root end of the ball screw (28) is supported by the front plate (23A) of the sliding frame (23) via the bearing (32), and the leading plate (19) and the sliding plate (18) are connected to each other. Is loosely fitted to the bearing (3) on the bearing (33) of the sliding frame (23).
It is supported through 4).

As shown in FIG. 10, the drive sliding plate (20) and the expansion / contraction diameter guide (14) of the expansion / contraction diameter core (12) for forming the packing groove are connected by a connecting pipe (35). The connecting pipe (27) connecting the sliding plate (18) and the leading plate (19) is the connecting pipe (3).
It is sent inside 5). The leading board (19) and the expansion / contraction diameter guide (15) of the expansion / contraction diameter core (13) for forming the recessed portion of the pipe connection portion are connected via a connection rod (36), and the connection rod (36) is connected. (36) is sent inside the connecting pipe (27).

As shown in FIG. 9, the rotary shaft of the rotary base (22)
A gear (37) is attached to the lower end of (21),
7) meshes with the band teeth (39) extended from the hydraulic cylinder (38).

In the above structure, as shown in FIG. 10, a thermoplastic resin melt such as polyvinyl chloride or polypropylene is injected into the cavity C formed between the outer mold (10) and the inner mold (11). Then, the molded product (1) (drainage basin) is molded. After the molded product (1) has cooled and solidified, a hydraulic motor
Driving (31), ball screw (28) through gears (30, 29)
When the ball is rotated in the normal direction, the drive sliding disk (20) to which the ball screw (28) is screwed starts sliding in the sliding frame (23) in the direction of arrow (i.e. inner mold drawing direction).

When the drive sliding plate (20) starts sliding in the direction of arrow (a), the expansion / contraction diameter core for forming packing groove, which is connected to the drive sliding plate (20) by the connecting pipe (35). The expansion / contraction diameter guide (14) of (12) starts sliding together with the drive sliding disk (20) in the direction of arrow A, and the fan-shaped core (12A) and trapezoidal core (12A) of the expansion / contraction diameter core (12). 12B) is the guide dovetail groove (14A, 14A) of the expansion / contraction diameter guide (14).
Guided by B), the fitting starts inside. As described above, the inclination angle θ of the guide dovetail groove (14B) of the trapezoidal core (12B)
₂ is the inclination angle θ of the guide dovetail groove (14A) of the fan-shaped core (12A)
Since it is set to be larger than ₁ (θ ₂ > θ ₁ ), the trapezoidal core (12B) is inserted earlier than the fan-shaped core (12A), and as shown in FIG. (12B) is the fan-shaped core
It enters the inside of (12A). In this way
The fan-shaped core (12A) and the trapezoidal core (12B) do not interfere with each other, and as shown in FIG. 12, the expansion / contraction diameter core (12) is completely inserted into the inner mold (11A) of the receiving part. The drive sliding board (20) contacts the leading board (19). The contact plate (24) connecting the sliding plate (18) and the leading plate (19) during sliding of the driving sliding plate (20) is a sliding frame by the pin (40A) of the electromagnetic cylinder (40). Since it is locked to (23), the connecting plate (24), that is, the sliding plate (18) and the leading plate (19), induces sliding by sliding of the driving sliding plate (20). You will not be punished. The position of the drive sliding disk (20) is detected by photoelectric means in a state where the drive sliding disk (20) is in contact with the leading disk (19), and the electromagnetic cylinder (40) is operated to connect the communication disk. The lock of (24) is released and the contact board (24) can be slid.

When normal rotation of the ball screw (28) is further continued by the hydraulic motor (31), the drive sliding plate (20) propels the leading plate (19) in the inner die drawing direction (arrow A), The leading board
The sliding plate (18) connected to the connecting plate (24, 25) and the connecting pipe (27) to (19) starts sliding in the direction of arrow a together with the leading plate (19).

An expansion / contraction diameter guide (15) of an expansion / contraction diameter core (13) for forming a recess of a pipe connecting portion is connected to the leader board (19) through a connecting rod (36), The expansion / contraction diameter guide (15) slides in the direction of arrow A as the leading board (19) slides. The expansion / contraction diameter core (13) is provided with a guide dovetail groove (1) of the expansion / contraction diameter guide (15).
5A) and is fitted inside by being guided by the sliding plate (18).
The internal mold (11
A) is linearly pulled out from the socket (3) of the molded product (1).

When the inner mold (11A) for the receiving opening is pulled out, the expansion / contraction diameter core (12) for forming the packing groove and the expansion / contraction diameter core (13) for forming the recess are in a reduced diameter state as described above, and no interference occurs. It won't happen. And as shown in FIG. 13, the inner part of the socket (11A)
When the pulling out is completed, the hydraulic cylinder (38) is actuated to project the band teeth (39) in the direction of arrow B in FIG. 9, and the rotary base (22) is moved through the gear (37) in FIG. Rotate in two directions. Then, the sliding frame (23) also rotates together with the rotary base (22) in the direction of arrow C in FIG. 14, and the front plate (23A) of the sliding frame (23).
The curved pipe inner mold (11B), which is connected to the curved pipe (16) via the connecting rod (16), rotates in the direction of the arrow D in FIG. 14 in accordance with the socket inner mold (11A) to bend the curved pipe (2) of the molded product (1). Is pulled out from. In this state, the position of the drive sliding board (20) is detected by photoelectric means or the like, and the electromagnetic cylinder (41) contained in the communication board (24).
The drive sliding plate (20) by protruding the pin (41A) of
Lock to 4). Although not described in detail, the inner part of the straight part (11C) and the inner part of the pipe connection part (11D) are also drawn out, and as shown in Fig. 15, each inner part (11A, 11B, 11C, 11D) is completely removed from the molded product (1). The outer mold (10) is divided into a lower mold (10A) and an upper mold (10B) in a state where the molded product (1) is taken out.

When the ball screw (28) is rotated in the reverse direction, the drive sliding plate (20) slides in the direction opposite to the arrow (a), and as described above, the drive sliding plate (20) locked to the connecting plate (24). 20) is the contact board (2
4, 25, 26) to push the sliding board (18) together with the leading board (19) to return the internal die (11A) to the insertion position shown in FIG. 10, and in this state, the driving sliding board The position of (20) is detected by photoelectric means or the like, and the electromagnetic cylinder (41) is actuated to unlock the drive sliding board (20) with respect to the communication board (24). 20) is separated from the contact board (24, 25, 26) and slid, and the expansion / contraction diameter guides (14, 15) with respect to the expansion / contraction diameter cores (12, 13).
By sliding the arrow a in the opposite direction to the expansion / contraction diameter core (12, 13).
Is set to the expanded state shown in FIG.

In the above embodiment, the ball screw is used for the linear drawing of the inner die, but an ordinary male screw rod may be used instead of the ball screw. However, the ball screw is superior in wear resistance to the ordinary male screw rod and has sufficient durability even in the repeated forming process. Ordinary electric motors other than hydraulic motors can be used to drive the ball screw,
The hydraulic motor can easily rotate forward and backward, and consumes less energy.

Further, in the case of the inner mold for the receiving part in which the expansion / contraction diameter core is not loaded, the screw rod may be directly screwed through the sliding plate connected to the inner mold for the receiving part.

[0023]

According to the present invention, the drive sliding disk is moved forward and backward by the forward and reverse rotations of the screw rod to move the expansion / contraction diameter guide for expanding / contracting the expansion / contraction diameter core forward / backward, and the driving sliding disk is connected to the leading disk. The inner mold of the receiving part is slid in the pulling-out direction and the inserting direction through the sliding board connected to the leading board by propelling. Therefore, the drive source only needs to rotate the screw rod forward and backward, which simplifies the structure of the injection molding die and makes the device inexpensive. Further, in the present invention, when the inner die is linearly pulled out and inserted from the molded product, it is carried out by rotating the screw rod threadedly penetrated to the drive sliding plate. Also, the molding die becomes compact, and particularly when the inner die is linearly drawn and then the inner die of the curved pipe is rotationally drawn, the space occupancy rate is greatly reduced as compared with the conventional mechanism.

[Brief description of drawings]

1 to 16 show an embodiment of the present invention.

[Fig. 1] Plan view of notched main part

[Fig. 2] Cross-sectional view of main part

FIG. 3 is a plan view of an expansion / contraction core for forming packing grooves.

FIG. 4 is a perspective view of an expansion / contraction diameter guide of an expansion / contraction diameter core for forming packing grooves.

5 is a sectional view taken along line AA in FIG.

6 is a sectional view taken along line BB in FIG.

FIG. 7 is a perspective view of an expansion / contraction diameter guide of an expansion / contraction diameter core for forming recesses.

[Figure 8] Illustration of the layout of the contact panel

FIG. 9 is a vertical cross-sectional view of the main part

FIG. 10 is a cross-sectional plan view of a main portion showing a state after molding

FIG. 11 is a plan view of the expanding / contracting diameter core for forming the packing groove in a reduced diameter state.

FIG. 12 is a plane cross-sectional view of the main part of the expanded / contracted core for packing groove forming in a contracted state.

FIG. 13 is a horizontal cross-sectional view of the main part of the receiving part inside the mold withdrawal completed.

FIG. 14 is a cross-sectional plan view of the main part of the curved pipe part in a die-drawn state.

FIG. 15 is an explanatory diagram of a completed state of drawing of the die in the curved pipe section.

FIG. 16 is a perspective view of a molded product (drainage basin). FIGS. 17 to 19 show a conventional example.

FIG. 17 is a plan view of a notched main portion showing a state after molding.

FIG. 18 is a plan view of a notched main portion showing a state where the expansion / contraction diameter core has been reduced

FIG. 19 is a plan view of the main part with the die in the receiving part completed to be pulled out.

[Explanation of symbols]

1 molded product (drainage basin) 3 Receptacle 3B packing groove 9 Mold 10 External type 11 Internal type 11A Mouth type 12 Expansion / contraction core for packing groove molding 12A fan-shaped core 12B trapezoid core 121A, 121B Engagement protrusion 14 Expansion / contraction diameter guide 14A guide dovetail 18 Sliding board 19 Leaderboard 20 Drive sliding board 23 Sliding frame 28 Ball screw (screw rod)

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-56-19716 (JP, A) JP-A-6-154944 (JP, A) JP-A-62-279914 (JP, A) JP-A-61- 76336 (JP, A) Actual development Sho 62-70907 (JP, U) Actual development Sho 50-148355 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B29C 33/44-33 / 54 B29C 45/40-45/44

Claims (2)

(57) [Claims] 1. A sliding board and a leading board which are interconnected in a sliding frame are slidably supported, and a driving sliding board is slid between the sliding board and the leading board. The sliding plate is connected to an inner mold of the receiving part for molding the inner shape of the receiving part to be molded, and the driving sliding plate is packed in the inner mold of the receiving part. The expansion / contraction diameter guide for expanding / contracting the expansion / contraction diameter core for forming the groove is connected, and the expansion / contraction diameter guide expands or contracts the diameter of the expansion / contraction core via the drive sliding plate by forward / reverse rotation of the screw rod. Characterized in that it slides in the direction, and the leading disc is integrally slid on the sliding disc by being propelled by the drive sliding disc, and the inner die of the receiving portion is pulled out from the formed receiving portion. Internal mold drawing mechanism 2. The expanding / contracting diameter core is composed of a plurality of fan-shaped cores and a plurality of trapezoidal cores interposed between the plurality of fan-shaped cores. The T-shaped engaging protrusions are slidably fitted in the guide dovetail grooves provided on the peripheral surface of the expansion / contraction diameter guide, and the guide dovetail grooves are inclined so as to spread in the inner die drawing direction. The internal die drawing mechanism according to claim 1.