JPH07223244A - Resin molding die device - Google Patents

Abstract

PURPOSE:To prevent the of productivity from being lowered by ejecting a resin molded product from a mold by means of a slantly moving ore block and a directly moving core block and then ejecting and moving an ejection component and releasing the resin molded product from the directly moving core block. CONSTITUTION:An automobile rear bumper 10 is ejected out of a movable side mold by the advancement of a pushing up core block, a directly moving core block 19 and a slantly moving core block 20. After that, an ejection pin 23 is ejected and moved from the directly moving core block 19. The automobile rear bumper 10 can be released easily and securely from the directly moving core block 19 set for forming a through-hole 10d forming recessed and projected sections by the arrangement. The lowering of productivity because of the erroneous release of the automobile rear bumper 10 can also be prevented by the arrangement. As the ejection pin 23 is ejected and moved by utilizing the movement of the slantly moving core block 20 as a drive source, the cost is not increased and the structure is not complicated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molding die apparatus applied in resin molding such as injection molding, and more particularly to a product cavity defined between a pair of molds closed with each other. It is placed in one of the molds to face it,
When the pair of molds open each other, the tilting core block that advances and moves in a direction intersecting with the opening and closing directions of the molds, and one of the tilting core blocks that faces the product cavity and is adjacent to the tilting core block. The present invention relates to an improvement of a resin molding die device provided with a linear motion core block which is arranged in a die and which advances and moves along the opening / closing direction of these dies when the pair of dies are opened.

[0002]

2. Description of the Related Art Conventionally, in a resin molding such as injection molding, for example, when a resin molding having an undercut portion is molded, a mold device has a tilting core block and a linear motion in one mold. There is one in which the core blocks are arranged so as to face the product cavities, and when the pair of molds are opened, the tilting core block and the linear motion core block are respectively moved forward and backward from one mold.

FIG. 6 conceptually shows a resin molding die apparatus of this type, in which an inner bent portion 3a extending substantially at right angles to the opening / closing direction X of the dies 1 and 2 is undercut. The injection-molding die device applied when molding the injection-molded article 3 to be described below is illustrated. In this mold device, a tilting core block 6 is arranged at the tip of an angular pin 5 extending from the ejector plate 4 in a manner inclined with respect to the opening / closing direction X of the molds 1 and 2, and the tilting core block 6 is provided. Reference numeral 6 denotes an inner bent portion 3 in the product cavity 7 of the injection-molded product 3.
The linear motion core block 9 is arranged at the tip of the ejector pin 8 which is disposed so as to face the portion for molding a and extends from the ejector plate 4 along the opening / closing direction X of the molds 1 and 2. The linear motion core block 9 is disposed so as to face the product cavity 7 at a position adjacent to the tilting core block 6.

In the injection molding die apparatus as described above, the movable die 2 is moved from the closed state as shown in FIG. 6 (a).
When the ejector plate 4 is opened in the direction closer to the movable mold 2 from this state, the angular pin 5 is opened as shown in FIG. 6B. The tilting core block 6 attached to and the direct-moving core block 9 attached to the ejector pin 8 are moved forward and backward from the movable mold 2, respectively, and the tilting core block 6 is sequentially injection-molded with the forward movement. Since the product 3 is moved in the direction in which it is removed from the inner bent portion 3a, the injection-molded product 3 can be easily and surely ejected from the movable mold 2.

[0005]

By the way, in actual resin molding, it may be necessary to mold uneven portions such as ribs and bosses of the resin molded product by the linear motion core block under various conditions. Generally, in the portion corresponding to the uneven portion of the resin molded product, it is easily affected by the shrinkage change when the molten resin is solidified, and the resin molded product immediately after molding is in a state of being crimped to the mold and the release resistance is Tends to grow.

Therefore, in the above-mentioned conventional mold apparatus for resin molding, as shown in FIG.
Since the injection molded product 3 is pressed onto the linear motion core block 9 via b, after the injection molded product 3 is ejected from the movable die 2, the injection molded product 3 is moved to the linear motion core block 9 It becomes difficult to take out the injection molded product, and there is a possibility that productivity may be reduced due to a mistake in taking out the injection molded product 3.

In view of the above situation, an object of the present invention is to perform resin molding capable of preventing a decrease in productivity even when the ribs and bosses of a resin molded product are molded by a linear motion core block. To provide a mold device for use.

[0008]

In a resin molding die apparatus according to the present invention, a tilting core block and a projecting member movably arranged in the linear motion core block with its tip facing the product cavity are advanced. A resin molding die device is provided with a protrusion drive means for causing the protrusion member to protrude from the linear motion core block so as to release the resin molded product when it is moved.

As the ejecting drive means, an urging mechanism for constantly energizing the ejecting member and holding the ejecting member in a retracted position with respect to the product cavity, and an abutting member for abutting the base end portion of the ejecting member. A cam mechanism that is provided in the tilting core block in a matching manner and that includes the cam mechanism that moves the protruding member according to the occupied position of the tilting core block with respect to the linear motion core block can be applied.

[0010]

In the present invention, the resin molded product is released from the linear motion core block by projecting the resin molded product from the mold by the advancing movement of the tilting core block and the linear motion core block, and then projecting the projecting member. I am trying to let you.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing an embodiment. 3 and 4 conceptually show a resin molding die apparatus according to the present invention. In particular, a fixed side die 12 attached to a fixed die mounting plate 11 and a spacer block 13 In a state where the movable die 15 attached to the movable die mounting plate 14 is closed, the molten resin is injected into the product cavity 16 defined between the die 12 and 15 to form the side wall portion 10a.
Has an inwardly bent portion 10b extending substantially at right angles to the opening / closing direction of the molds 12 and 15 (hereinafter, simply referred to as the mold opening / closing direction X), and the side wall portion of the front wall portion 10c. The above-mentioned mold opening / closing direction X is almost present in a portion located near 10a.
Injection-molded product having a through hole 10d extending along, for example, a rear bumper 10 for a four-wheeled vehicle as shown in FIG.
2 illustrates an example of a mold device for injection molding that is applied when molding a mold.

As shown in FIG. 3, in this mold device, an ejector plate 17 is arranged at a portion located between the movable mold mounting plate 14 and the movable mold 15, and The core block 18 is pushed up to the part of the movable mold 15 that faces the product cavity 16,
A linear motion core block 19 and a tilting core block 20 are arranged.

The ejector plate 17 is in the form of a flat plate, and is arranged so as to be movable in the mold opening / closing direction X so as to be always parallel to the movable mold mounting plate 14.
Although not shown in the drawing, the ejector plate 17 is connected to a driving means (not shown),
In the normal state, the movable die mounting plate 14 is arranged so as to come into contact with the upper surface of the movable die mounting plate 14. On the other hand, when the driving means (not shown) is operated at an appropriate timing, It has the effect of moving forward and backward in the direction of proximity.

The push-up core block 18 is arranged at a portion corresponding to the outer surface and the inner end surface of the inner bent portion 10b of the automobile rear bumper 10 and has a push-up pin 21 at the lower end thereof. Push-up pin 2
1 extends from the push-up core block 18 along the mold opening / closing direction X, is slidably inserted into the movable side mold 15, and the lower end thereof is fixed to the ejector plate 17. ing.

The linear motion core block 19 is arranged at a portion extending from a position covering a part of the through hole 10d in the automobile rear bumper 10 to the inner surface of the side wall portion 10a, and a linear motion pin is provided at a lower end portion thereof. 22 and the through hole 10 in the vehicle rear bumper 10
A protruding pin 23 is provided at a portion corresponding to the peripheral wall of d. The linear motion pin 22 is similar to the push-up pin 21 described above.
It extends from the linear motion core block 19 along the mold opening / closing direction X, is slidably inserted into the movable side mold 15, and the lower end part thereof is the ejector plate 1.
It is fixed to 7.

As shown in FIGS. 1 and 2, the ejecting pin 23 is in the form of a column having a flange 23a on the peripheral surface of its middle portion, and one end surface of which is formed flat.
The other end surface is formed into a spherical shape, and the inside of the case 24 fixed to the lower surface of the linear motion core block 19 in such a manner that the other end surface formed into a spherical shape faces downward and moves along the axial direction thereof. It is housed in. As shown in FIGS. 1A and 2, the protrusion pin 23 is constantly pressed downward by the biasing force of a biasing spring 25 interposed between the flange 23a and the linear motion core block 19. And the flat top surface of the product cavity 1
It is held in a position in which it is receded with respect to position 6.

As shown in FIG. 3, the tilting core block 20 is located below the linear motion core block 19 and has an inner bent portion 10b in the vehicle rear bumper 10.
Is provided at a portion corresponding to the inner surface of the, and has an angular pin 26 at the lower end thereof, and has a defect portion 20a on the surface facing the linear motion core block 19. The angular pin 26 is located closer to the extension of a portion of the product cavity 16 corresponding to the side wall portion 10a of the vehicle rear bumper 10 in the downward direction, that is, in the position where the push-up pin 21 is arranged in the downward direction. It extends in a manner inclining in the direction of approaching, is slidably inserted in the movable side mold 15, and the lower end part thereof is further in the ejector plate 17
It is slidably supported by.

The missing portion 20a extends along the inclination direction of the angular pin 26 at a position including the arrangement position of the protrusion pin 23, and is the protrusion most protruding from the lower surface of the linear motion core block 19. Pin 2
It is formed with a depth equal to the length of 3, and has a cam member 27 on its inner bottom surface. The cam member 27 is
Is extended along the inclination direction of the angular pin 26,
The reference surface 27a is provided at the end portion on the back side, and the reference surface 27a is provided at a portion close to the product cavity 16.
With respect to the protruding surface 27b and the inclined surface 27 that connects the reference surface 27a and the protruding surface 27b continuously.
c and has the reference surface 27a as the defective portion 20a.
The defect portion 20a in a state of being arranged on the same plane as the inner bottom surface of the
It is embedded in the accommodation recess 20b formed inside. Figure 1
As is clear from (a), the cam member 27 is attached to the protrusion pin 23 via the reference surface 27a in the state where the fixed side mold 12 and the movable side mold 15 are closed to each other. Abutted.

In the injection molding die apparatus constructed as described above, first, as shown in FIG.
4 and spacer block 13 through movable mold 15
Is closed with respect to the fixed mold 12, and injection of the molten resin into the product cavity 16 is started with the ejector plate 17 being in contact with the upper surface of the movable mold mounting plate 14.

When the molten resin injected into the product cavity 16 is solidified by appropriately maintaining the pressure and cooling the mixture, as shown in FIG.
As shown in (b) and FIG. 4, the movable side mold 15 is opened and moved relative to the fixed side mold 12, and the driving means (not shown) is actuated from this state, thereby The ejector plate 17 is moved forward with respect to the movable die 15, and the push-up pin 21, the linear motion pin 22 and the angular pin 26 are moved forward with respect to the movable die 15 as the ejector plate 17 moves. Each push up core block 1
8, linear motion core block 19 and tilting core block 20
The rear bumper 10 for an automobile is ejected from the movable-side mold 15 via the.

At this time, the action of the push-up core block 18 regulates the situation in which the automobile rear bumper 10 moves in a direction intersecting with the mold opening / closing direction X, and the action of the inclined angular pin 26 causes the tilting. Since the core block 20 moves forward in a direction intersecting with the mold opening / closing direction X, the tilting core block 20 is reliably pulled out from the inwardly bent portion 10b of the automobile rear bumper 10.

Moreover, when the tilting core block 20 moves in the direction intersecting the mold opening / closing direction X, the contact position of the cam member 27 with respect to the ejecting pin 23 is changed, and the ejecting pin 23 is moved by the cam member. By the action of the inclined surface 27c and the protruding surface 27b of 27, the upward movement is performed against the urging force of the urging spring 25, and the upper end portion thereof is moved to protrude from the linear motion core block 19, so that the inner bent portion 1
The rear bumper 10 for an automobile, which is in a state of being crimped to the linear motion core block 19 and the push-up core block 18 through the uneven portions such as 0b and the through hole 10d, is It will be moved up and the rear bumper 10 for the car
Is completely released from the movable mold 15.

Therefore, it becomes possible to easily and surely take out the automobile rear bumper 10 after molding from the mold device, and immediately after the next automobile rear bumper 1.
The movable side mold 15 can be closed and moved relative to the fixed side mold 12 in order to perform molding of 0.
When the movable side mold 15 is closed and moved relative to the fixed side mold 12, as shown in FIGS. 1A and 3, the tilting core block 20 causes the product cavity 16 to move.
The cam member 27 is moved toward the reference surface 27a.
Therefore, the protrusion pin 23 is attached to the biasing spring 25.
It will be returned to the normal position by the urging force of.

As described above, according to the apparatus of the above embodiment, the movable die 1 is moved by the advancing movement of the push-up core block 18, the linear motion core block 19 and the tilting core block 20.
After projecting the rear bumper 10 for an automobile from 5, the projecting pin 23 is projectingly moved from the linear motion core block 19, so that the through hole 10 which is an uneven portion is formed.
The rear bumper 10 for an automobile can be easily and reliably released from the linear motion core block 19 configured to mold d.
It is possible to prevent a decrease in productivity due to a mistake in taking out 0. Moreover, since the ejection pin 23 is caused to project and move by using the movement of the tilting core block 20 as a drive source, a drive source such as an actuator is not particularly required, resulting in an increase in cost and a complicated structure. Nothing.

In the above embodiment, the pair of molds are arranged so as to move in the vertical direction, and the automobile rear bumper is molded in the product cavity defined between the molds. However, the present invention is not limited to these, and for example, a pair of molds arranged in such a manner that they move in the left-right direction or molding other than injection molding. It can also be applied to a mold device adapted to mold other resin molded products depending on the method. Further, although a mold apparatus for molding a resin molded product having an undercut portion is illustrated, the resin molded product does not necessarily have to have an undercut portion. Further, although the direct-acting core block and the tilting core block are made to advance and move by the operation of the ejector plate, it goes without saying that these core blocks may be made to advance and move by other actuators.

Further, in the above embodiment, the protruding pin is arranged on the linear motion core block for molding the through hole of the resin molded product, but the linear motion core block for molding other uneven portions. The same effect can be expected even when the protruding member is arranged at.

Further, in the above-mentioned embodiment, the movement of the tilting core block in the direction intersecting the mold opening / closing direction is converted into the projecting movement of the ejecting member by the cam member. Needless to say, the protruding member may be moved by the operation.

[0028]

As described above, according to the resin molding die device of the present invention, the ejecting member is ejected after the resin molded product is ejected from the die by the advancing movement of the tilting core block and the linear motion core block. Since the resin molded product is released from the linear motion core block by projecting and moving the resin molded product, the linear motion core block can also be used to mold uneven portions such as ribs and bosses of the resin molded product. The resin molded product can be reliably released from the mold, and the productivity can be prevented from lowering.

Moreover, if a device having a cam mechanism for moving the projecting member according to the occupied position of the tilting core block with respect to the linear motion core block is applied as the projecting drive means, a special drive source such as an actuator is required. Therefore, it is possible to prevent the cost from increasing and the structure from becoming complicated.

[Brief description of drawings]

FIG. 1 conceptually shows a main part of a resin molding die device according to the present invention, in which (a) is a sectional view showing a closed state;
(B) is sectional drawing which shows an open state.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a conceptual side view of a resin molding die device according to the present invention, showing a closed state of the die.

FIG. 4 is a conceptual side view of a resin molding die device according to the present invention, which is a cross-sectional side view showing an opened state of the die.

5 is a perspective view conceptually showing an example of a resin molded product molded by the resin molding die device shown in FIGS. 3 and 4. FIG.

6A and 6B conceptually show a conventional resin molding die device, wherein FIG. 6A is a sectional view showing a closed state, and FIG. 6B is a sectional view showing an opened state.

[Explanation of symbols]

 10 ... Rear bumper for automobile 12, 15 ... Mold 16 ... Product cavity 19 ... Linear core block 20 ... Tilting core block 23 ... Projection pin 24 ... Case 25 ... Energizing spring 27 ... Cam member 27a ... Reference surface 27b ... Projection Surface 27c ... Inclined surface X ... Mold opening / closing direction

Claims (2)

[Claims] 1. A mold is disposed so as to face a product cavity defined between a pair of molds closed with each other,
When the pair of molds are opened to each other, a tilting core block that advances and moves in a direction intersecting the opening and closing directions of these molds, and one of the tilting core blocks that faces the product cavity and is adjacent to the tilting core block. A resin molding die device comprising a linear motion core block which is arranged in a die and which moves forward and backward along the opening and closing direction of the die when the pair of die are opened to each other. A protruding member movably arranged in the linear motion core block so as to face the cavity, and the linear motion core block for ejecting the resin molded product when the tilting core block advances and moves. A mold device for resin molding, comprising: a protrusion driving means for causing the protrusion to move from the mold. 2. The pushing-out driving means constantly biases the pushing-out member and holds the pushing-out member in a retracted position with respect to the product cavity, and a pushing-out mechanism that abuts a base end portion of the pushing-out member. A cam mechanism provided in the tilting core block in a form of contacting engagement, for moving the projecting member according to an occupied position of the tilting core block with respect to the linear motion core block. 1. The mold device for resin molding according to 1.