JP2876961B2 - Mold equipment for injection molding machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold apparatus for an injection molding machine having a gate cut pin and an ejector pin.

[0002]

2. Description of the Related Art An ejector pin or the like having a different operating time.
The mold device of the conventional injection molding machine equipped with various kinds of operation pins,
These two types of operation pins are separately mounted on two dedicated movable plates, respectively, and both movable plates are operated with a single hydraulic cylinder or two hydraulic cylinders in a timely manner. -25452
Gazette, Japanese Patent Publication No. 1-53616).

[0003]

The mold device of the above-mentioned conventional injection molding machine has a complicated structure because it requires two movable plates and one or two hydraulic cylinders.
In the case of using two hydraulic cylinders, there is a problem that the control system of the hydraulic cylinder is complicated in addition to the above.

An object of the present invention is to provide a mold apparatus for an injection molding machine which has a simple structure and does not complicate a control system of a drive device such as a hydraulic cylinder.

[0005]

In order to achieve the above object, the invention according to claim 1 is directed to an injection having a gate cut pin for closing a gate of a molding cavity and an ejector pin for projecting a molded product or the like from a mold. In the mold apparatus of the molding machine, the gate cut pin is moved from the mold mounting plate toward the mold mounted on the mold mounting plate by a driving device .
Fixed to the movable plate which is moved by a single drive rod, to the ejector pin, the movable plate in contact directly brought into contact with the mold mounting plate during the resin injection for receiving the flange and the molding cavity for receiving the pressing of the movable plate formed integrally with a fixing portion for stopping the backward movement of the ejector pin relative to, the ejector pin, the through hole of the movable plate, fitted to the pressure-receiving flange to the movement restricting portion provided in the through-hole, and movable plate The gate cutting movement is freely performed, and the insertion is movably inserted in the axial direction within a range in which the pressure receiving flange is regulated by the movement regulating section.
According to a second aspect of the present invention, a gate of a molding cavity is provided.
Close the gate cut pin and push the molded product
Mold device of an injection molding machine equipped with an ejector pin
Then, the gate cut pin is moved from the mold mounting plate to the mold.
Of the drive unit toward the above mold attached to the mold mounting plate
Movable moved through gap block by drive rod
Fix to the plate and attach the movable pin to the ejector pin.
Pressure receiving flange and molding cavity receiving pressure
When the resin is injected, the movable plate and the gap
Up through the interposition plate provided with a gap between the lock
Indirectly abuts the mold mounting plate and
A fixed part that stops the retraction movement of the ejector pin is
Connecting the ejector pins to the through holes of the movable plate.
The pressure-receiving franc is attached to a movement restricting portion provided in the through hole.
And move the movable plate through the gate.
Range in which the pressure receiving flange is freely regulated by the movement regulation unit
, So that it is inserted movably in the axial direction.

[0006] It is preferable that a plurality of plate members are laminated in the thickness direction to form a movable plate, and a movement restricting portion is formed between adjacent plate members. Drive as possible out to the hydraulic cylinder.

[0007]

In the mold clamping state, when the movable plate is moved by the driving device after the injection of the resin, the gate cut pin operates to cut the gate. In addition, when the movable plate is moved after the start of the mold opening, the ejector pins operate to release the molded product or the like from the mold. Since the movable plate and the driving device are shared by the gate cut pin and the ejector pin and need only be a single system, the structure and the control system are simplified.

[0008]

1 to 5 show one embodiment of a mold apparatus for an injection molding machine according to the present invention. In these figures, reference numeral 1 denotes a fixed mold, and 2 denotes a movable mold. The fixed mold 1 includes a mold body 3 and an insert 4 and is attached to a fixed mold mounting plate 5. The moving mold 2 includes a mold body 6 and a core 7.
And is attached to the movable mold attaching plate 8 via the spacer block 9. Between the insert 4 and the core 7, a molding cavity C, a gate G and a sprue S are formed between the insert 4 and the core 7 when the molds 1 and 2 are clamped. A sprue bush 11 is fitted into the fixed mold 1 and the mold mounting plate 5.

A movable plate 12 is inserted in a portion of the spacer block 9 between the movable mold 2 and the mold mounting plate 8. The movable plate 12 is formed by laminating two plate members 13 and 14 integrally in the thickness direction.
5 and a return pin 16 and ejector pins 17 and 18.

The gate cut pin 15 has a fixed seat 15 at one end.
a, one end of which is inserted into a fixing hole 14 a formed in the plate 14, and a fixing seat 15 a between the plates 13, 14.
And is fixed to the movable plate 12. Similarly to the gate cut pin 15, the return pin 16 has a fixed seat 16a, one end of which is inserted into a fixed hole 14b formed in the plate 14, and the fixed seat 1 between the plates 13, 14.
6a and is fixed to the movable plate 12.

The ejector pins 17, 18 have flanges (pressure receiving portions) 17a, 18a and fixed portions 17b, 18 at one end.
b, respectively, and flanges 17a, 18a are individually inserted into the movement restricting portions 13c, 14c, 13d, 14d formed on the plates 13, 14, respectively.
14, through holes 13e, 14e, 13f, 14
f and is attached to the movable plate 12. Each of the ejector pins 17 and 18 is
a, 18a are movement restricting portions 13c, 14c, 13d, 14
It is movable in the axial direction with respect to the movable plate 12 within a range where the movement is restricted by d.

The gate cut pin 15 is connected to the main body 6 of the mold 2.
The return pin 16 is in a shaft hole 6b formed in the main body 6, and the ejector pin 17 is in a shaft hole 6c, 7c formed in the main body 6 and the core 7.
Further, other ejector pins 18 are individually inserted into shaft holes 6d formed in the main body 6, respectively. Each pin 1
5, 16, 17 and 18 are parallel to each other, and the movable plate 12 can move each pin 15, 16, 17, 18 in the axial direction with respect to the mold 2.

A coil spring 20 is provided between the movable mold 2 and the movable plate 12. Coil spring 20
Urges the movable plate 12 to the left in FIG. The movable mold mounting plate 8 has a through hole 8a. A drive rod 21 driven by a drive device 19 such as a hydraulic cylinder is inserted into the through hole 8a, and pushes the movable plate 12 rightward in FIG. 1 against the elasticity of the coil spring 20.

In the clamped state, a gap ga between the tip of the gate cut pin 15 and the gate G, a gap gb between the tip of the return pin 16 and the fixed mold 1, and flanges in the movement restricting portions 13c and 14c. The relationship of the floating gap gc of the 17a to the mold mounting plate 8 side (the floating gap of the movable plate 12 to the mold 2 side) is set as ga = gb ≦ gc. In the mold clamping state, each ejector pin 1
The fixed portions 17b, 18b of the 7, 8 abut against the movable mold mounting plate 8, and the tips of the ejector pins 17, 18
2 so as to be located at a predetermined position.

Next, the operation of the mold apparatus of the injection molding machine according to the present invention having the above configuration will be described. FIG. 1 shows a state in which the mold cavities 1 and 2 are clamped, and the molding cavity C is filled with resin through a sprue bush 11, a sprue S, and a gate G. In this state, the movable plate 12 is pressed by the coil spring 20 and comes into contact with the mold mounting plate 8, and the ejector pins 17 and 18 make the respective fixed portions 17 b and 18 b abut on the mold mounting plate 8. .

When the molding cavity C is completely filled with the resin, the driving device 19 is operated to push the movable plate 12 with the driving rod 21. Due to the movement of the movable plate 12, the gate cut pin 15 and the return pin 16 protrude rightward in FIG. 1, the gate cut pin 15 cuts the gate, and the tip of the return pin 16 contacts the mold 1 (see FIG. 1). 2). At this time, as described above, ga = gb ≦
Since it is set to gc, the movable plate 12 only moves with respect to the ejector pins 17 and 18 and does not move the ejector pins 17 and 18. After the gate cut is completed, the drive rod 21 is retracted, and the movable plate 12 is returned to the original state by the urging force of the coil spring 20 (FIG. 3).

The mold is opened after the resin filled in the molding cavity C is solidified (FIG. 4). At an appropriate time when the mold is opened, the drive device 19 is operated again to drive the drive rod 21.
The movable plate 12 is pushed and moved with. In this case, each of the ejector pins 17 and 18 has a movable gap g
After moving the distance corresponding to c, the movable plate 12
The flanges 17a and 18a are pushed and protruded by
The molded product M and the sprue runner Sr are separated from the mold 2 (FIG. 5).

FIGS. 2 to 5 are provided to explain the operation in an easy-to-understand manner, and irrelevant members are omitted, and the details do not always correspond to FIG.
The movement restricting portions 13c, 14c, 13d, 14d can be provided only on the plate 14 as shown in FIGS.
It can also be provided only in the case.

FIG. 6 shows another embodiment of the mold apparatus of the injection molding machine according to the present invention. In this mold apparatus, the gap block 22 is fixed to the movable plate 12 with screws 23,
Interposed plate 24 between movable plate 12 and gap block 22
Are provided with a gap gd (= gc). The interposed plate 24 is guided by a guide shaft 25, and the movable plate 12
Can be moved to the left and right in the gap gd in a state where is separated from the mounting plate 8. Fixing part 18 of ejector pin 18
b has a structure in which it comes into contact with the interposition plate 24 in the mold clamping state.

In the case of this embodiment, the ejector pins 18
The fixing portion 18b of the above abuts against the interposition plate 24 in the mold clamping state, and fixes the ejector pin 18 to the mold mounting plate 8 via the interposition plate 24. Since other structures and operations are the same as those of the mold apparatus of FIG. 1, the same parts are denoted by the same reference numerals and description thereof is omitted.

In the mold apparatus shown in FIG.
Through hole 8a and the ejector pin 18 of the intervening me on a straight line near
When the plate 24 is not provided , the ejector pins 1 during injection do not come into contact with the movable mold mounting plate 8 because the fixing portion 18b does not abut.
8 recedes by the clearance of gc, causing a problem in the molded product.
The above problem is solved by adopting this structure.

[0022]

As described above, according to the present invention, a mold apparatus morphism of claim 1, wherein <br/> molding machine has a gate cut pin closing the gate of the molding cavity, the ejector pins eject the molded product from the mold In the mold apparatus of an injection molding machine provided with the above, the gate cut pin is one of a drive device from the mold mounting plate to the mold mounted on the mold mounting plate.
Is fixed to the movable plate which is moved by the drive rod, the ejector pin, the ejector relative to the movable plate in contact directly brought into contact with the mold mounting plate during the resin injection against the pressure receiving flange molding cavity which receives the pressing of the movable plate A fixed portion for stopping the pin from retreating is integrally provided, and the pressure receiving flange is fitted into a through hole of the movable plate and into a movement restricting portion provided in the through hole.
In addition , the movable plate is freely inserted in the axial direction within a range in which the pressure receiving flange is regulated by the movement restricting portion by freely moving the gate cut of the movable plate. Any one of them may be used, which has the effect of simplifying the structure and making it harder to break down. Also, the invention according to claim 2 is a method of forming a cavity in a molding cavity.
The gate cut pin that closes the gate and the molded product from the mold
Mold mounting of injection molding machine with ejector pin protruding
In the installation, the gate cut pin is separated from the mold mounting plate
A driving device is directed toward the mold mounted on the mold mounting plate.
Is moved through the gap block by the drive rod
The ejector pin is fixed to the movable plate,
Pressure receiving flange and molding cavity receiving the pressure of the movable plate
The movable plate and the above
The intervening plate provided with a gap between it and the gap block
Indirectly abuts the mold mounting plate via
With the fixed part that stops the ejector pin from retreating.
To the through hole of the movable plate.
The pressure receiving flange is inserted into the
To move the movable plate
Moves in the axial direction within the range where the pressure receiving flange is
In addition to the above effects,
The ejector pin on the center line of the drive rod of the drive.
Even if there is, there is an effect that can be implemented.

When a plurality of plates are laminated in the thickness direction to form a movable plate, and a movement restricting portion is formed between adjacent plates, the structure of the movable plate is simplified, and the movement restricting portion is easily formed. it is possible.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a mold apparatus of an injection molding machine according to the present invention.

FIG. 2 is a schematic cross-sectional view showing a gate cut state by a gate cut pin.

FIG. 3 is a schematic sectional view showing a state in which a drive rod is retracted after a gate cut.

FIG. 4 is a schematic cross-sectional view of a mold open state.

FIG. 5 is a schematic sectional view showing a protruding state of a molded product and a sprue runner.

FIG. 6 is a sectional view of a main part showing another embodiment of the mold apparatus of the injection molding machine according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed die 2 Moving die 5 Fixed die mounting plate 8 Moving die mounting plate 12 Movable plate 13 Plate 13c Movement regulation part 13d Move regulation part 13e Through hole 13f Through hole 14 Plate 14a Fixing hole 14b Fixing hole 14c Movement restricting part 14d Movement restricting part 14e Through hole 14f Through hole 15 Gate cut pin 17 Ejector pin 17a Flange (pressure receiving part) 17b Fixed part 18 Ejector pin 18a Flange (pressure receiving part) 18b Fixed part 19 Hydraulic cylinder (drive device) M Molding Product C Molding cavity G Gate Sr Sprue runner

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masaki Ogawa 1-485 Shimoshitajo, Nagaoka City, Niigata Prefecture Niigata Micronics Co., Ltd. (56) References JP-A-55-14218 (JP, A) JP-A-3-193428 (JP, A) JP-A-59-171632 (JP, A) JP-A-57-24026 (JP, U) JP-A-1-115522 (JP, U) (58) Int.Cl. ⁶ , DB name) B29C 45/26-45/44 B29C 33/00-33/76

Claims (4)

(57) [Claims] 1. A mold apparatus for an injection molding machine, comprising: a gate cut pin for closing a gate of a molding cavity; and an ejector pin for projecting a molded product or the like from a mold, wherein the gate cut pin is moved from a mold mounting plate to the mold. One drive of a driving device is directed toward the mold attached to the mold mounting plate.
Fixed to the movable plate moved by moving the rod, the ejector pin, the ejector pin relative to the movable plate in contact directly brought into contact with the mold mounting plate during the resin injection for receiving the flange and the molding cavity for receiving the pressing of the movable plate one a fixing portion for stopping the retracting movement of
A body, the through hole of the movable plate, fitted to the pressure-receiving flange to the movement restricting portion provided in the through hole, and freely and the pressure receiving flange movement limiting portion is regulating a gate cut movement of the movable plate A mold apparatus for an injection molding machine, wherein the mold apparatus is inserted so as to be movable in the axial direction within a range to be performed. 2. A gate for closing a gate of a molding cavity.
Cut pins and ejectors that eject molded products from the mold
In the mold apparatus of an injection molding machine provided with a pin, the gate cut pin is formed by moving the mold mounting plate from the mold mounting plate.
Drive lock of the drive unit toward the above-mentioned mold attached to
Plate that is moved by a gap through a gap block
And the ejector pin is pressed by the movable plate.
Injection of resin into the pressure receiving flange and molding cavity
At the gap between the movable plate and the gap block
Indirectly connected to the mold mounting plate via an intervening plate
After the ejector pin against the movable plate
It has a fixed part for stopping retreat
In the through-hole of the port, the movement restricting portion provided in the through-hole
The pressure receiving flange is fitted, and the movable plate
The pressure receiving flange is regulated by the movement regulation section by freely moving the socket.
It is inserted so that it can move freely in the axial direction within the range
Mold device of injection molding machine. Wherein the movable plate is made by bonding a plurality of plate members in the thickness direction, the movement restricting portion is injection according to claim 1 or 2, characterized in that formed between the plate member adjacent Mold equipment for molding machines. 4. The mold device for an injection molding machine according to claim 1, wherein the drive device is a hydraulic cylinder.