JP3889692B2 - Resin molding equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin molding apparatus having a reciprocating DoSo location used the desired operation object to reciprocate.
[0002]
[Prior art]
Conventionally, as a reciprocating device for reciprocating a resin molding die in a resin molding device, there is a structure as shown in FIG. 9 (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-11-34124 [0004]
The reciprocating device shown in FIG. 9 is provided by being incorporated in a resin molding apparatus provided with resin molding dies 91 and 92, and a movable block 94 that defines a part of the cavity 93 is provided in the same figure. It is for reciprocating in the direction of arrow Na. Thus, if the movable block 94 is provided so as to be able to reciprocate in a direction different from the mold opening direction indicated by the arrow Nb, it is suitable for molding a resin molded product having a complicated shape. This conventional reciprocating device is capable of reciprocating in the direction of arrow Nc by operating a reciprocating cylinder 95A that directly supports the movable block 94 and reciprocates in the direction of arrow Na, and another reciprocating cylinder 95B. And a lock block 96.
[0005]
In this reciprocating device, as shown in FIG. 4B, when the resin is filled into the cavity 93 and molding is performed, the lock block 96 is disposed behind the movable block 94. As a result, the movable block 94 is locked, and the movable block 94 does not move backward due to the resin pressure in the cavity 93. According to such a configuration, since the lock block 96 bears the resin pressure in the cavity 93, the load acting on the reciprocating cylinder 95A is reduced, and the reciprocating cylinder 95A can be downsized. As shown in FIG. 5A, if the locking block 96 is retracted from the back of the movable block 94, the movable block 94 can be appropriately retracted.
[0006]
[Problems to be solved by the invention]
However, in the above prior art, in addition to the reciprocating cylinder 95A for reciprocating the movable block 94, a reciprocating cylinder 95B for reciprocating the locking block 96 is also required, and the cost of the entire apparatus is expensive. It becomes. Further, the control of the reciprocating cylinders 95A and 95B becomes complicated. Further, for example, the backward movement of the movable block 94 needs to be started after waiting for the lock block 96 to be retracted from the back of the movable block 94, and the speed of moving the movable block 94 can be improved. There is room.
[0007]
The invention of the present application has been conceived under such circumstances, and includes a reciprocating device that has a small number of parts of a driving device, is easy to control operation, and is excellent in speediness, and the same. An object of the present invention is to provide a resin molding apparatus.
[0008]
DISCLOSURE OF THE INVENTION
In order to solve the above problems, the present invention takes the following technical means.
[0009]
Resin molding apparatus which is herein onset Ming Thus provided, a mold for forming a cavity for resin molding, a portion of the mold and a reciprocating device for advancing and retracting movement toward the cavity a resin molding apparatus comprising, the reciprocating device includes a follower block for forwardly and backwardly moving in a first direction, a driving block which abuts on the driven block, a support portion for supporting the drive block, the the drive block has a drive source for reciprocating in a second direction crossing the first direction while being supported by the support portion, at least one of the drive block and the driven block, the driven block by movement of the drive block has inclined cam surfaces against movably the second direction is provided to the first direction, to the drive block , Than the cam surfaces are pressure-receiving surface inclination is small formation on the second direction, a first posture in which the drive block and the driven block abuts in the pressure-receiving surface, the contacting in the cam surface 2 can be switched by reciprocating movement of the drive block , and the drive block and the driven block are partially connected to the drive block so as to be rotatable. A part of the driving block is linked to the recess provided on the side surface of the driven block by an auxiliary member that engages with a predetermined play in the first direction and the second direction, so that the driving block is in the second direction. when moving in a predetermined direction in the direction of the driven block is characterized by forced retreating to Rukoto in the first direction.
[0010]
According to such a configuration, when the first position is set, the driven block can be supported by the drive block and locked so as not to move in the first direction. The driven block is locked in a state where the pressure receiving surface of the drive block is in contact with the driven block, because the pressure receiving surface is less inclined with respect to the second direction than the cam surface. In addition, most of the force acting on the pressure receiving surface can be supported by the support portion so that a large load does not act on the drive source. Therefore, it is suitable for avoiding an increase in the size of the drive source. On the other hand, when the drive block is moved in the second direction while the second posture is maintained, the cam surface is an inclined surface, so that the driven block is moved along the inclined surface. The effect of guiding in the direction of 1 is exhibited and the driven block moves. As a result, the driven block can be moved back and forth in the first direction. Further, according to such a configuration, when the drive block is moved, the driven block can be retracted in the first direction only by moving the cam surface in a predetermined direction in the second direction. Even if a situation that cannot be performed occurs, the driven block can be forcibly retracted in the first direction by utilizing the engaging action of the auxiliary member.
[0011]
The switching setting between the reciprocating movement and the locking of the driven block as described above is performed by reciprocating the driving block by the driving source. Therefore, unlike the prior art, it is not necessary to use a plurality of drive sources. As a result, it is possible to reduce the size and cost of the entire apparatus. In addition, the speed of operation is excellent.
[0012]
In a preferred embodiment of the present invention, the pressure-receiving surface is a plane whose inclination angle with respect to the second direction is zero or substantially zero. According to such a configuration, the force received by the drive block from the driven block is more efficiently borne by the support portion, which is more suitable for reducing the load acting on the drive source.
[0013]
In a preferred embodiment of the present invention, a plurality of the cam surfaces are provided on the drive block and the driven block so as to be in contact with each other, and a plurality of the pressure receiving surfaces are provided on the drive block, The driven block is provided with a plurality of flat surfaces that can come into contact with the plurality of pressure receiving surfaces. According to such a configuration, when the driven block is moved in the first direction, the cam surfaces of the driven block and the drive block come into contact with each other, so that the moving operation of the driven block is smoothed. Is planned. In addition, since a plurality of these cam surfaces are provided, the load resistance can be improved. Similarly, when the driven block is fixed, the load resistance can be improved by bringing the plurality of pressure receiving surfaces and the plurality of flat surfaces into contact with each other.
[0017]
Other features and advantages of the present invention will become more apparent from the following description of embodiments of the invention.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be specifically described with reference to the drawings.
[0019]
Figures 1-6 illustrates an example of engaging Ru tree fat forming apparatus to the present invention, the resin molding apparatus comprises a reciprocating device. The resin molding apparatus A of this embodiment is configured as a resin molding of an instrument panel 1 that is an interior product of an automobile. For easy understanding, the configuration of the instrument panel 1 will be described first.
[0020]
The instrument panel 1 has a shape as shown in FIG. 7, for example, and includes an airbag door portion 10. More specifically, when the instrument panel 1 is used, as shown in FIG. 8, an airbag device 8 for a passenger seat is fixedly disposed inside the instrument panel 1, and the front surface of the airbag device 8. Is the airbag door section 10. The airbag door portion 10 is formed integrally with other portions of the instrument panel 1. When the airbag device 8 is activated and the airbag (not shown) is inflated and deployed on the back surface of the instrument panel 1, the airbag door portion 10 is broken and opened as shown by the phantom line in the figure. A plurality of rupture grooves 11 are formed for the purpose. A plurality of ribs 13 are formed on the back surface of the airbag door portion 10, and the other ends of the plurality of retainers 80 whose one ends are fixed to the housing of the airbag device 8 are joined to the plurality of ribs 13. Yes. The plurality of retainers 80 support the airbag door portion 10 when the airbag device 8 is actuated to open the airbag door portion 10 so that the airbag door portion 10 is not scattered into the vehicle interior. Is to do.
[0021]
As clearly shown in FIG. 1, the resin molding apparatus A of this embodiment includes a mold composed of an upper mold 2 </ b> A and a lower mold 2 </ b> B for molding the instrument panel 1 described above, and a lower mold 2 </ b> B. It comprises a reciprocating device B for raising and lowering two cores 21a and 21b as movable molds constituting a part in the direction of arrow N1 in the figure. The direction of arrow N1 corresponds to an example of the first direction in the present invention, and the direction of arrow N2 orthogonal to the direction corresponds to an example of the second direction in the present invention.
[0022]
The upper mold 2A and the lower mold 2B can approach and separate from each other, for example, by allowing the upper mold 2A to move up and down. These can form the cavity 20 for shape | molding the instrument panel 1 when it clamps as shown in FIG. 1 and FIG. The resin molding apparatus A is provided with a plurality of groove forming blades 3 whose front end portions enter into the cavity 20 as means for forming the breaking grooves 11 of the instrument panel 1. The plurality of groove forming blades 3 are in the form of a metal plate and are connected in a rectangular shape in plan view corresponding to the shape of the plurality of breaking grooves 11. The base end portions of the plurality of groove forming blades 3 are connected via a connecting member 30. The plurality of groove forming blades 3 may be provided in a fixed state, but are preferably reciprocable in the direction of arrow N1 by a reciprocating cylinder (not shown) or the like. If the plurality of groove forming blades 3 can be reciprocated as described above, when the molten resin is filled into the cavities 20, the tip portions of the respective groove forming blades 3 are retracted from the cavities 20 to the respective portions of the cavities 20. By making the tip of the groove forming blade 3 enter the cavity 20 between the end of filling of the resin into the cavity 20 and the hardening of the resin, the instrument is made to flow smoothly. The breaking groove 11 can be appropriately formed in the panel 1.
[0023]
The cores 21 a and 21 b of the lower mold 2 </ b> B are portions for forming the one side 12 of the airbag door part 10. These cores 21 a and 21 b are formed separately from the other parts of the lower mold 2 </ b> B, and the periphery thereof is surrounded by a plurality of groove forming blades 3. As shown in FIG. 2, the resin molding apparatus A also includes a plurality of support rods 4 that pass through the cores 21 a and 21 b and the connecting member 30 and come into contact with the instrument panel 1. The plurality of support rods 4 are fixedly provided and, as will be described later, when the cores 21a and 21b are lowered after the instrument panel 1 is molded, no damage or the like is caused at the location where the breaking groove 11 is formed. To help you to. The cores 21a and 21b are provided with a plurality of recesses 22 for forming a plurality of ribs 13, and the arrangement thereof is as shown in FIG. 3, for example. The arrangement of the plurality of support rods 4 is also as shown in FIG.
[0024]
In FIG. 1, the reciprocating device B includes a reciprocating cylinder 40, a drive block 41, a driven block 42, an auxiliary member 43, and a support portion 44. The drive block 41 and the driven block 42 are arranged below the cores 21 a and 21 b and the connecting member 30, and the cores 21 a and 21 b are connected and supported by the driven block 42 via a plurality of connecting rods 29.
[0025]
The reciprocating cylinder 40 is, for example, a hydraulic type, and the drive block 41 is connected to the rod 40a of the reciprocating cylinder 40 so that it slides on the surface of the support portion 44 and reciprocates in the direction of arrow N2. It is free to move. The support portion 44 can be formed using various members as long as it has a function of supporting the drive block 41 and allowing reciprocation in the direction of the arrow N2, for example, for resin molding A part of the mold or an appropriate member for supporting the mold may be used as the support portion 44.
[0026]
The driven block 42 and the drive block 41 are opposed to and in contact with each other in the arrow N1 direction. The upper surface portion of the drive block 41 is formed in a stepped shape having a step in the thickness direction of the drive block 41, and a plurality of cam surfaces 45a and a plurality of pressure receiving surfaces 46a are alternately arranged in this portion in the direction of the arrow N2. Is formed. The lower surface portion of the driven block 42 is also formed in a step shape corresponding to the upper surface portion of the drive block 41, and a plurality of cam surfaces 45b and a plurality of flat surfaces 46b are alternately formed in this portion.
[0027]
Each cam surface 45a is a surface that allows the driven block 42 to rise when the drive block 41 moves forward in the direction indicated by the arrow N2a in FIG. 1, and has an inclination angle of, for example, about 45 degrees with respect to the arrow N2 direction. It is formed as an inclined surface. Each cam surface 45b is also an inclined surface parallel or substantially parallel to the cam surface 45b. The plurality of pressure-receiving surfaces 46a are surfaces for receiving a load from the driven block 42 when the elevation of the driven block 42 is stopped, and are formed as a plane having an inclination angle of zero or substantially zero with respect to the arrow N2 direction. ing. Each flat surface 46b is parallel or substantially parallel to each pressure receiving surface 46a. In this reciprocating device B, the setting of the first posture where the plurality of pressure receiving surfaces 46a and the plurality of flat surfaces 46b abut and the second posture where the plurality of cam surfaces 45a and 45b abut, The drive block 41 can be switched by reciprocation in the direction of arrow N2. The movement of the driven block 42 in the arrow N2 direction is restricted.
[0028]
The auxiliary member 43 is for applying a descending force to the driven block 42, and as shown in FIG. 4, one end 43 a of the auxiliary member 43 is rotatably attached to the drive block 41 via a shaft 47. ing. At the other end portion 43 b of the auxiliary member 43, a protruding engagement portion 49 that is engaged with a recess 48 formed on the side surface of the driven block 42 is formed. As shown in FIG. 1, the recess 48 is formed in a shape and size that allow the engaging portion 49 to have appropriate play in the directions of the arrows N1 and N2. When the drive block 41 is retracted by a certain amount or more in the direction of the arrow N2b, the engaging portion 49 is engaged with the wall surface 48a that defines the recess 48, whereby the auxiliary member 43 can pull the driven block 42 down. It has become.
[0029]
Next, the operation of the reciprocating device B and the resin molding device A including the same will be described.
[0030]
First, as shown in FIGS. 1 and 2, when the instrument panel 1 is molded by filling the resin into the cavity 20 formed by the upper mold 2A and the lower mold 2B, as shown in FIG. Each pressure receiving surface 46a of 41 and each flat surface 46b of the driven block 42 are brought into contact with each other. By setting in this way, the driven block 42 is prevented from descending (retracting) , so that the cores 21a and 21b can be prevented from being unduly pushed down by the pressure in the cavity 20. Since each pressure receiving surface 46a is a surface that is not inclined with respect to the direction of the arrow N2 or a surface that has almost no inclination, each pressure receiving surface 46a has a large component force in the direction of the arrow N2 due to the pressing force F received from the driven block 42. It is possible to cause the support portion 44 to bear all or substantially all of the pressing force F. As a result, it is possible to avoid the pressing force F from acting directly on the reciprocating cylinder 40 and to achieve downsizing by reducing the burden on the reciprocating cylinder 40. Further, since the pressing force F can be distributed and loaded on each of the plurality of pressure receiving surfaces 46a, the load resistance is excellent.
[0031]
In order to take out the instrument panel 1 after resin molding of the instrument panel 1, the upper mold 2A is raised and the mold is opened, and then the reciprocating device B is driven, as shown in FIGS. As described above, the cores 21a and 21b of the lower mold 2B are lowered (retracted) in the direction of the arrow N1. In this way, the following advantages can be obtained. That is, since the recesses 22 and the ribs 13 of the cores 21a and 21b are strongly fitted to each other when they are molded during resin molding, the pressing force of the instrument panel 1 is suddenly increased using an unillustrated push pin or the like. If the portion other than the airbag door portion 10 is pressed upward, only the other portion of the instrument panel 1 may be pushed out while the airbag door portion 10 is in close contact with the cores 21a and 21b. When such a situation occurs, a portion where the breaking groove 11 of the instrument panel 1 is formed is bent and damaged. On the other hand, if the cores 21a and 21b are lowered first as described above, such a fear can be avoided. When the cores 21a and 21b are lowered, as shown in FIG. 6, the airbag door portion 10 is lowered along with the cores 21a and 21b because the plurality of support rods 4 are in contact with the airbag door portion 10. Therefore, the cores 21a and 21b can be appropriately separated from the airbag door portion 10 without generating a large stress at the portion where the breaking groove 11 is formed.
[0032]
The above-described lowering operation of the cores 21a and 21b is performed by retracting the drive block 41 in the direction of the arrow N2b in FIG. 5 and lowering the driven block 42. The driven block 42 is lowered by gravity. Therefore, when the adhesion between the cores 21a and 21b and the instrument panel 1 is strong, it may be difficult to lower the driven block 42 by gravity. On the other hand, in the reciprocating device B, as described above, when the drive block 41 is retracted in the direction of the arrow N2b, the auxiliary member 43 pulls the driven block 42 and forcibly lowers it. For this reason, the lowering operation of the cores 21a and 21b can be ensured.
[0033]
After lowering the cores 21a and 21b and taking out the instrument panel 1 from the lower mold 2B, resin molding is started again. In this resin molding, the cores 21a and 21b are raised and returned to their original positions. This operation can be performed by operating the reciprocating cylinder 40 to advance the drive block 41 by an appropriate amount in the direction of the arrow N2a. it can. When the drive block 41 moves forward, the driven block 42 is raised by the action of the inclined cam surfaces 45a and 45b slidingly contacting each other. Even during this ascent, the plurality of cam surfaces 45a and 45b are in sliding contact with each other at the same time, so that the load resistance can be improved.
[0034]
As described above, in this reciprocating device B, by merely reciprocating the drive block 41 using one reciprocating cylinder 40, the driven block 42 and the cores 21a and 21b are moved up and down (retracted) and the lifted operation. The fixed holding at the time of stopping, particularly the fixed holding that can reduce the load on the reciprocating cylinder 40 can be achieved. Therefore, the structure of the reciprocating device B and the resin molding device A according to the present embodiment is simple compared to the prior art in which two reciprocating cylinders must be used. In addition, the reciprocating cylinder can be easily controlled, and the operation can be performed quickly.
[0035]
The present invention is not limited to the embodiment described above. The specific structure of each part of the engagement Ru tree fat forming apparatus to the present invention, be varied in many ways.
[0036]
For example, as a means for reciprocating the driven block in the first direction, it is preferable to provide a cam surface on each of the driven block and the drive block from the viewpoint of smoothing the operation. It is possible to move the follower block even when an inclined cam surface is provided on only one of them and the other non-inclined surface portion is in contact with this cam surface. Such a configuration can also be adopted. Moreover, although it is preferable to provide a plurality of cam surfaces and pressure receiving surfaces, respectively, in order to improve the load resistance, the specific number thereof is not limited. The drive source is not limited to a hydraulic reciprocating cylinder, and other types of reciprocating cylinders, linear motors, and the like can also be used. The reciprocating device according to the present invention is not limited to the use of reciprocating the molding die of the resin molding device, but can be used for various other purposes.
[0037]
The resin molding apparatus according to the present invention is not limited to molding an instrument panel. In the invention of the present application, instead of the configuration in which the molding die to be operated is connected to the driven block, the molding die to be operated is directly brought into contact with the drive block so that the molding die is directly applied to the present application. It can also be set as the driven block said by invention. According to such a configuration, the manufacturing cost of the entire apparatus can be further reduced by reducing the number of parts.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part showing an example of a resin molding apparatus provided with a reciprocating device according to the present invention.
2 is a cross-sectional view of a portion different from the cross-sectional portion of FIG. 1 of the resin molding apparatus shown in FIG.
3 is a plan view of the main part of the lower mold of the resin molding apparatus shown in FIGS. 1 and 2. FIG.
4 is a cross-sectional view taken along the line IV-IV in FIG.
5 is a cross-sectional view of a principal part showing the operation of the resin molding apparatus shown in FIGS. 1 and 2. FIG.
6 is a cross-sectional view of a principal part showing the operation of the resin molding apparatus shown in FIGS. 1 and 2. FIG.
FIG. 7 is a perspective view showing an example of an instrument panel.
8 is a cross-sectional view taken along line VIII-VIII in FIG.
FIGS. 9A and 9B are cross-sectional views of relevant parts showing an example of a conventional technique. FIGS.
[Explanation of symbols]
A Resin molding device B Reciprocating device 1 Instrument panel 2A Upper mold (molding mold)
2B Lower mold (molding mold)
20 Cavity 21a, 21b Core 40 Reciprocating cylinder (drive source)
41 Drive block 42 Drive block 43 Auxiliary member 44 Support portions 45a, 45b Cam surface 46a Pressure receiving surface 46b Plane 49 Engagement portion

Claims (3)

A resin molding apparatus comprising: a molding die for forming a resin molding cavity; and a reciprocating device for moving a part of the molding die forward and backward toward the cavity,
The reciprocating device includes a driven block for advancing and retreating in a first direction, a drive block that contacts the driven block, a support portion that supports the drive block, and a support block that supports the drive block. And a drive source that reciprocates in a second direction that intersects the first direction ,
At least one of the drive block and the driven block is provided with a cam surface inclined with respect to the second direction so that the driven block can move in the first direction by the movement of the drive block .
The drive block is formed with a pressure receiving surface having a smaller inclination with respect to the second direction than the cam surface ,
The drive block and the driven block can be switched between a first posture where the pressure receiving surface abuts and a second posture where the drive block abuts on the cam surface by reciprocation of the drive block , and
The drive block and the driven block are partially connected to the drive block in a rotatable manner, and the other part is in the first direction with respect to the recess provided on the side surface of the driven block. When the drive block moves in a predetermined direction in the second direction, the driven block is moved in the first direction by being linked by an auxiliary member that engages with the predetermined play in the second direction. wherein the forced retracted to Rukoto, resin molding apparatus. 2. The resin molding apparatus according to claim 1, wherein the pressure receiving surface is a plane having an inclination angle of zero or substantially zero with respect to the second direction. A plurality of the cam surfaces are provided on each of the drive block and the driven block so as to be in contact with each other,
The resin molding according to claim 1 or 2, wherein a plurality of the pressure receiving surfaces are provided on the drive block, and the driven block is provided with a plurality of flat surfaces capable of contacting the plurality of pressure receiving surfaces. Equipment .

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