JP3945207B2 - Injection molding equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an injection molding apparatus, and more particularly to an injection molding apparatus in which a molded product including an undercut portion can be easily taken out.
[0002]
[Prior art]
  There are various shapes of resin products to be injection-molded, and the mold, mold clamping mechanism, and mold opening mechanism are designed according to the shape. In particular, the shape with the tip part thicker than the base end part as viewed from the mold opening surface and / or the shape having the undercut part of the part is difficult to take out the molded product after mold opening, and injection molding. The structure of the device tends to be complex. Specifically, in a molded product having a shape in which the distal end is thicker than the proximal end as viewed from the mold opening surface,thinFrom the base endthickThe mold cannot be moved toward the tip. In the mold opening directionAlongIn a molded product having an undercut portion having an angle, the mold cannot be moved along the mold opening direction. Here, two examples of a conventional injection molding apparatus designed for a resin product having such a shape will be outlined with reference to FIGS. 15 and 16.
  First, the injection molding apparatus shown in FIG. 15 shown as the first conventional example employs a mechanism for obliquely pushing out an extrusion block 1001 forming a molded product. FIG. 15A shown here is an explanatory side sectional view for illustrating an example of a conventional undercut processing structure, and FIG. 15B is an explanatory plan view thereof. In this injection molding apparatus, a piece shape designed according to the undercut shape is provided to perform molding and mold release.
[0003]
  Subsequently, the injection molding apparatus of FIG. 16 shown as the second conventional example employs a mechanism for moving the movable block 1002 shown in the figure in the direction of the arrow. FIG. 16A is a side sectional view for illustrating another example of a conventional undercut processing structure, and FIG. 16B is a front view at a position bb shown in FIG. FIG. 16C is a sectional explanatory view, and FIG. 16C is a plan explanatory view thereof. In this injection molding apparatus, a movable block 1002 having a plate shape including an inverse portion (undercut portion) of a part p as a molded product is connected by a cam block 1003 and a T-shaped guide 1004, and a hydraulic cylinder. The movable block 1002 moves in the direction of the arrow by moving the cam block 1003 by an actuator such as 1005. By the way, the operation at the time of molding is the cam block before pushing out the parts.1003Return the movable block1002Extrude is performed with the part removed from the part.
[0004]
[Problems to be solved by the invention]
However, in the injection molding apparatus according to the first conventional example, when the inverse amount related to the part p of the molded product is i (see FIG. 15A), the extrusion block 1001 and the part p do not interfere with each other during the extrusion operation. In addition, it is necessary to provide a gap of i + α between the extrusion block 1001 and the part p. For this reason, when the width w of the component p is narrow in the shape of the component p, there is a problem that the portion indicated by b of the extruded block 1001 becomes thin, resulting in insufficient strength and breakage of the mold. In addition, when the width w of the part p is even smaller, there is a problem that the mechanism of this injection molding apparatus cannot be employed in the first place.
[0005]
Further, in the injection molding apparatus in the second conventional example, it is necessary to select the hydraulic cylinder 1005 so that the cam block 1003 is not pushed back by the load due to the resin pressure acting on the movable block 1002, especially when the resin pressure is large. Therefore, a large hydraulic cylinder corresponding to this is required. For this reason, this injection molding apparatus has the inconvenience that the mold structure is complicated and large, and that it takes time to adjust the sliding portion of the cam and the mold cost increases. In addition, since the unit becomes large, there is a design inconvenience that the hydraulic cylinder or the like exceeds the allowable outer dimensions of the mold. Furthermore, there are many restrictions on the layout of the temperature adjustment water holes due to the provision of the operation groove for the movable block 1002 in the core 1006, and there is also a problem that mold temperature adjustment is liable to occur.
[0006]
The present invention has been made in view of such problems of the prior art, and has the advantage that the number of mold component units is small, the apparatus itself is compact, and there are few design restrictions, and molding is performed with a high degree of freedom. An object of the present invention is to provide an injection molding apparatus that can design and change a mold and is suitable for molding a molded product having a complicated shape.
[0007]
[Means for Solving the Problems]
  (1) To achieve the above purpose,The present inventionThe second mold among the first mold, the second mold that moves relatively close to and away from the first mold, and the molded product molded by the first mold and the second mold. At least an undercut portion having a predetermined undercut angle with respect to the movement direction of the mold is molded, and is detachably fitted into the second mold, and moves in a direction opposite to the movement direction of the second mold. There is provided a block mold, and the block mold is provided with an injection molding apparatus provided with guide means for guiding the block mold detached from the second mold in a direction corresponding to the undercut angle.
  In this invention, the guide means moves along the predetermined undercut angle direction in a direction opposite to the cam block guide groove provided in the block mold and in the direction opposite to the movement direction of the block mold. Cam block inserted into the grooveIt is preferable to have. The guide means is
It is preferable to include a slide block guide groove provided in the block mold and a slide block that slides into the slide block guide groove along a direction substantially perpendicular to the moving direction of the second mold..Further, the slide block is preferably a substantially columnar member whose axial direction is a direction substantially orthogonal to the direction in which the slide block guide groove is provided..In the present invention, an undercut portion is formed, a detachable block mold is provided on the second mold, and guide means for guiding the block mold in a direction corresponding to the undercut angle is further provided on the block mold. This block mold moves in the opposite direction relative to the movement direction of the second mold.
[0008]
The operation of the present invention will be described. First, the block mold is moved in the opposite direction relative to the moving direction of the second mold and is detached from the second mold. At this time, the molded product is placed in a block mold. The guide means guides the block mold in the direction corresponding to the undercut angle, so that the block mold is separated in the direction corresponding to the undercut angle relative to the molded product, thereby releasing the mold. Goods can be obtained.
[0009]
  Further, in the present invention, the guide means specifically includes a cam block guide groove provided in a block shape, and a cam block inserted into the cam block guide groove.It is preferable to provide.Similarly, it is preferable to include a slide block guide groove provided in a block shape and a slide block that slides into the slide block guide groove. In this invention, the cam block guide groove is provided along the undercut angle direction, and the slide block guide groove is provided along a direction substantially perpendicular to the moving direction of the second mold. In the present invention, the arrangement of the cam block guide groove and the slide guide groove is not particularly limited and can be appropriately determined in relation to other members. Therefore, even if it is provided on the side of the block type,TypeIt may be provided inside and the position thereof is not limited. The form of the cam block is not particularly limited, and may be a substantially rod-like form, a substantially plate-like form, a substantially square form, a substantially cylindrical form, or any other form. Also, the form of the slide block is not limited in the same manner. In particular, when the slide block is a substantially cylindrical member and its axial direction is substantially perpendicular to the slide block guide groove, the workability can be improved. In particular, the slide block guide groove is formed inside the block mold. Is particularly advantageous.
[0010]
  In this invention,Similar to the above-described invention, the block mold is moved in the opposite direction relative to the moving direction of the second mold and is detached from the second mold. At this time, the molded product is placed in a block mold. The cam block that moves in the opposite direction relative to the moving direction of the block type is inserted into a cam block guide groove provided in the block type. At this time, since the cam block guide groove is provided along the undercut angle, the cam block is inserted along the cam block guide groove while moving in the opposite direction relative to the block type. Along with this insertion operation, the slide block slides along a slide block guide groove provided in a direction substantially perpendicular to the moving direction of the second mold. As described above, the operation of inserting the cam block at an angle along the undercut angle direction with respect to the moving direction of the second mold, and the slide block in a direction substantially perpendicular to the moving direction of the second mold are performed. Due to the sliding operation, the guide means guides the block mold in the direction corresponding to the undercut angle, so that the block mold is relatively moved away from the molded product in the direction corresponding to the undercut angle, thereby releasing the mold. Molded products can be obtained. As a result, the mold itself can be designed and modified with a high degree of freedom, while having the advantages of fewer mold components and the compactness of the device itself, and less design restrictions, and molding of molded products with complex shapes. An injection molding apparatus suitable for the above can be provided.
[0011]
  (2) To achieve the above purpose,The present inventionAccording to the above, the guide means moves the block mold and the molded product in the opposite direction relative to the second mold during the period from the mold opening position to the first mold release position. During the period from the mold release position to the second mold release position, an injection molding apparatus is provided that moves the cam block and the molded product in the opposite direction relative to the block mold.
  In the present invention, from the first aspect, the guide means includes a first ejector plate that moves relatively close to and away from the moving direction of the second mold, and an elastic body, and one end portion is the first portion. A guide pin fixed to one ejector plate, a second ejector plate that is elastically pressed against the first ejector plate, one end is fixed to the first ejector plate, and the other end is formed by the molding Knockout pin that contacts the product, one end is fixed to the first ejector plate, the other end is fixed to the cam block, and one end is fixed to the second ejector plate The other end is fixed to the slide block, the other end is fixed to the second mold, and the other end is the first release position at the first mold release position. An abutting pin disposed so as to pass through the ejector plate and abut against the second ejector plate, and the first ejector plate and the second ejector pin during the period from the mold opening position to the first mold release position. The first ejector plate is relatively moved relative to the second mold while the ejector plate is relatively moved toward the second mold and reaches the second mold release position from the first mold release position. And the second ejector plate maintains the first release position by the abutment pin.Injection molding equipmentWill be provided.
[0012]
  Further, from the second viewpoint, the guide means is a first plate that moves relatively close to and away from the mounting plate provided in a fixed position with respect to the second mold and the moving direction of the second mold. The ejector plate, one end is fixed to the first ejector plate by a spring fixed to the mounting plate, and the other end is fixed to the first ejector plate. One end is fixed to the first ejector plate, the other end is a first rod fixed to the cam block, and one end is the second. The other end is fixed to either the second rod fixed to the slide block and either the mounting plate or the second ejector plate, and has a link groove. And a link pin fixed to either the mounting plate or the second ejector plate and sliding in the link groove, and the first ejector during the period from the mold opening position to the first mold release position. While the plate and the second ejector plate move relatively closer to the second mold and reach the second mold release position from the first mold release position, the first ejector plate moves to the second mold. An injection molding apparatus is provided in which the link pin abuts against the end of the link groove and the second ejector plate maintains the first release position while moving relatively close to each other..  In this invention, the operation of the guide means in the first stage from the mold opening position to the first release position, and the guide means in the second stage from the first release position to the second release position. The invention is specified from the viewpoint of operation. That is, during the period from the mold opening position to the first mold release position, the block mold and the molded product are moved in the opposite directions relative to the second mold, whereby the block mold is first moved to the second mold. Remove from mold. The molded product is placed on the block mold at the first release position.
[0013]
Subsequently, the guide means moves the cam block and the molded product in the opposite directions relative to the block mold during the period from the first mold release position to the second mold release position. Here, the cam block and the molded product move in the opposite directions with respect to the block mold. When the cam block moves in the opposite direction with respect to the block type, the cam block is inserted into the cam block guide groove, and the slide block slides into the slide block guide groove. In this way, the guide means guides the block mold in the direction corresponding to the undercut angle by these two-stage operations, so that the block mold has an undercut angle relative to the molded product. It is possible to obtain a molded product which is separated in a corresponding direction and thereby is released.
[0014]
Subsequently, two modes for specifically driving this operation will be described. First, an injection molding apparatus according to a first aspect includes a first ejector plate that moves relatively closer to and away from the moving direction of the second mold, and a second ejector that is elastically pressed against the ejector plate by a guide pin. And an ejector plate. One end of the knockout pin and the first rod is fixed to the first ejector plate. The other end of the knockout pin is in contact with the molded product, and the other end of the first rod is fixed to the cam block. On the other hand, the end of the second rod is fixed to the second ejector plate, and the other end of the second rod is fixed to the slide block. Further, the abutting pin, which has one end fixed to the second mold, abuts the second ejector plate at the first mold release position.
[0015]
The operation of this injection molding apparatus will be described. The first ejector plate and the second ejector plate move relatively closer to the second mold from the mold opening position to the first separation position. At this time, since the second ejector plate is elastically pressed against the first ejector plate by the guide pin, both move while maintaining the positional relationship at the mold opening position. In this movement, the knockout pin fixed to the first ejector plate and the molded product that is in contact with the other end, and the first rod fixed to the first ejector plate and the cam block fixed to the other end are also used. Similarly, it moves closer to the second mold. Further, the second rod fixed to the second ejector plate and the slide block fixed to the other end also move closer to the second mold. By this movement, the block mold is detached from the second mold.
[0016]
Subsequently, when the first separation position is reached, the abutment pin penetrates the first ejector plate and comes into contact with the second ejector plate. Since one end of the abutting pin is fixed to the second mold, the second ejector plate stops approaching movement and maintains the first release position. Since the first ejector plate through which the abutting pin passes is continuously moved along with the cam block and the molded product, the cam block is inserted into the cam block guide groove, and the molded product is released from the block mold. . In this operation of inserting the cam block, the slide block stops together with the second ejector plate, and slides in a slide block guide groove provided along a direction substantially perpendicular to the moving direction of the second mold. The mold also maintains the first release position. As described above, the operation of inserting the cam block at an angle along the undercut angle direction with respect to the moving direction of the second mold, and the slide block in a direction substantially perpendicular to the moving direction of the second mold are performed. Due to the sliding operation, the guide means guides the block mold in the direction corresponding to the undercut angle, so that the block mold is relatively moved away from the molded product in the direction corresponding to the undercut angle, thereby releasing the mold. Molded products can be obtained.
[0017]
As a result, the mold itself can be designed and modified with a high degree of freedom, while having the advantages of fewer mold components and the compactness of the device itself, and less design restrictions, and molding of molded products with complex shapes. An injection molding apparatus suitable for the above can be provided.
[0018]
Next, the injection molding apparatus according to the second aspect will be described. The basic operation of this injection molding apparatus is the same as that of the injection molding apparatus of the first aspect described above. The difference is the stop mechanism of the second ejector plate at the first mold release position. For this reason, the second ejector plate stopping mechanism will be mainly described here.
[0019]
The injection molding apparatus includes a mounting plate that is fixed in position with respect to a second mold, a first ejector plate that moves relatively close to and away from the second mold, and a first ejector that includes a spring. And a second ejector plate that is pressed against the plate. Moreover, it has a knockout pin, a 1st rod, a 2nd rod, a slide block, and a cam block which are the structures similar to the injection molding apparatus demonstrated previously. In addition to this, the link fixed to either the mounting plate or the second ejector plate and the link groove provided in the link are slid and fixed to either the mounting plate or the second ejector plate. Link pins. The link pin slides in the link groove of the link, and when the link pin comes into contact with the end of the link groove, the slide is stopped. This link is fixed to either the mounting plate or the second ejector plate, and the link pin is fixed to the other side. That is, the link pin is fixed to the second ejector plate when the link is fixed to the mounting plate, and the link pin is fixed to the mounting plate when the link is fixed to the second ejector plate. Such a link and link pin can define the positional relationship between the mounting plate or the second mold fixed to the mounting plate and the second ejector plate.
[0020]
The operation of this injection molding apparatus will be described. The first ejector plate and the second ejector plate move relatively closer to the second mold from the mold opening position to the first separation position. At this time, since the second ejector plate is elastically pressed against the first ejector plate by the spring, both move while maintaining the positional relationship at the mold opening position. In this movement, the knockout pin fixed to the first ejector plate and the molded product that is in contact with the other end, and the first rod fixed to the first ejector plate and the cam block fixed to the other end are also used. Similarly, it moves closer to the second mold. Further, the second rod fixed to the second ejector plate and the slide block fixed to the other end also move closer to the second mold. By this movement, the block mold is detached from the second mold.
[0021]
Subsequently, when the first separation position is reached, the link pin comes into contact with the end portion of the link groove. Since the link having the link groove and the link pin are respectively fixed to either the mounting plate or the second ejector plate, the second ejector plate is brought into contact with the end of the link groove by the link pin. The release position of 1 will be maintained. On the other hand, since the first ejector plate, to which the link and the link pin are not fixed, continues to move closer together with the cam block and the molded product, the cam block is inserted into the cam block guide groove, and the molded product is released from the block mold. Be made.
[0022]
In this way, the same effect as the previously described injection device and the same effect is obtained, and in addition, the same effect can be obtained without including the configuration corresponding to the guide pin of the injection molding device described above. The number of parts can be reduced.
[0023]
【The invention's effect】
  The present inventionAccording to the present invention, it is possible to design and change a mold with a high degree of freedom while having the advantage that there are few mold component units, the apparatus itself is compact, and there are few design restrictions. An injection molding apparatus suitable for molding can be provided.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a molded product molded by the injection molding apparatus 1 according to this embodiment will be described with reference to FIG. This molded product includes an undercut portion having a distal end portion thicker than a base end portion as viewed from the mold opening surface, and a part of the molded product having a predetermined undercut angle with respect to the mold opening direction. Specifically, as shown in FIG. 1A, in this molded product, the tip part W2 is thicker than the base end part W1, and the mold moves along the direction toward the tip part indicated by the arrow p in the drawing. Can not be released. Further, as shown in FIG. 1B, which is a cross-sectional view of the molded product shown in FIG. However, the mold cannot be released by moving the mold along the direction indicated by the mold opening direction y, including an undercut portion having a predetermined undercut angle α. The injection molding apparatus 1 according to this embodiment will be described by taking as an example a case where a molded product having a complicated shape and difficult to release is formed. Then, the structure of the injection molding apparatus 1 which concerns on this embodiment is demonstrated, referring FIGS. 2 is an explanatory front sectional view of the injection molding apparatus according to this embodiment in a state before completion of mold opening and before extrusion, FIG. 3 is an explanatory side sectional view at position c of the injection molding apparatus in FIG. 2, and FIG. FIG. 5 is a plan view of the injection molding apparatus in FIG. 2. In this embodiment, the rigid injection molding apparatus 1 will be described as an example, but it is naturally applicable to a horizontal injection molding apparatus.
[0025]
  Since FIG. 2 shows a state where the mold opening is completed, the first mold 5 that forms the cavity 3 together with the second mold 6 is not shown. As shown in FIG. 2, the injection molding apparatus 1 is detachably fitted into a second mold 6 that moves relatively close to and away from the first mold 5 (not shown) and the second mold 6. In the moving direction of the second mold 6forAnd a block mold 7 that moves in the opposite direction. The molded product 2 is placed on the block mold 7, and the moving direction of the second moldgIn contrast, at least an undercut portion having a predetermined undercut angle is formed.
[0026]
  The block mold 7 is guided in the direction according to the undercut angle by the guide means. The guide means includes a cam block guide groove 9a provided inside the block mold 7, a cam block 9 inserted into the cam block guide groove 9a, and a direction substantially perpendicular to the movement direction of the block mold 7. And a slide block 8 that slides into the slide block guide groove 8a. The state shown in FIG. 2 is a state in which the mold opening has been completed and the mold release has not yet proceeded, so that the cam block 9 has a cam block guide groove 9.aIs not inserted.
[0027]
Subsequently, a configuration positioned as a drive mechanism for driving the guide means will be described. The guide means of the injection molding apparatus 1 has a first ejector plate 12 and a second ejector plate 13, and the second ejector plate 13 is guided by a guide pin 14 provided with an elastic body 15. 1 is pressed against one ejector plate 12. One end of a knockout pin 17 and a first rod 10 is fixed to the first ejector plate 12. The other end of the knockout pin 17 is in contact with the molded product 2, and the other end of the first rod 10 is fixed to the cam block 9. On the other hand, the end of the second rod 11 is fixed to the second ejector plate 13, and the other end of the second rod 11 is fixed to the slide block 8. Furthermore, one end of the abutting pin 16 is fixed to the second mold 6 so as to come into contact with the second ejector plate 13 at the first release position. By the way, the first ejector plate is provided with a through hole so that the abutting pin 16 can penetrate the first ejector plate 12.
[0028]
  In order to explain the configuration of the slide block 8 and the cam block 9 which are the center of the guide means in more detail, FIG. 3 shows a cc cross section of the injection molding apparatus 1 shown in FIG. The dd cross section of the injection molding apparatus 1 shown by 2 is shown. In FIG. 3, a cross section of the slide cam block 8 is shown. In FIG. 4, the cam block is shown.9The cross section of is shown.
  As shown in FIG. 3, the slide block guide groove 8 a is provided in the block mold 7 along a direction substantially perpendicular to the moving direction of the second mold 6. Since this state is after mold opening is complete and before mold release is started, slide block8Is not moved and is close to the end of the slide block guide groove 8a. The slide block 8 shown here is a rectangular member, but this shape is not particularly limited.
  As shown in FIG. 4, the cam block guide groove 9a is formed inside the block mold 7 along the undercut angle. Inserted into the cam block guide groove 9 a is a cam block 9 that is pivotally locked to the end of the first rod 10. The shape of the cam block 9 is not particularly limited, and a rod-like member or a cylindrical member can be applied.
[0029]
  FIG. 5 is a view of the state of the mold opening completion as viewed from the plane direction of the block mold 9 (the direction in which the first mold 5 is present). Inside the block mold 9, there are a cam block guide groove 9a, a cam block 9, a slide block guide groove 8aThe slide block 8 is arranged next to each other. Since both the slide block 8 and the cam block 9 are small members, their arrangement can be determined according to the injection molding apparatus to be applied. It can be freely determined in consideration of various conditions such as layout restrictions and layout restrictions of the temperature adjustment water holes of the second die 6 main body.
[0030]
Then, operation | movement of the injection molding apparatus 1 which concerns on this embodiment is demonstrated, referring FIGS. FIG. 6 is an explanatory front sectional view at a first mold release position in the middle of mold release of the injection molding apparatus according to the present embodiment. FIG. 7 is a second mold release completed of the injection mold apparatus according to the present embodiment. 8 is an explanatory front sectional view, FIG. 8 is an explanatory side sectional view at the position c of the injection molding apparatus in FIG. 7, FIG. 9 is an explanatory side sectional view at the position d in the injection molding apparatus in FIG. 7, and FIG. It is a plane explanatory view of an injection molding device.
[0031]
  The mold release is started from the state where the mold opening shown in FIG. 2 is completed, and the state shown in FIG. 6 is a diagram showing a state at the first mold release position. After the mold opening is completed, the first ejector plate 12 moves relatively closer to the second mold 6. At this time, since the second ejector plate 13 is elastically pressed against the first ejector plate 12 by the guide pins 14, the first ejector plate 12 and the second ejector plate 13 are brought into contact with the second die 6. approach. Incidentally, the 1st and 2nd ejector plates 12 and 13 may move close, the 2nd type | mold 6 may move close, and these should just be able to approach relatively. By this approach movement, the first rod 10 and the knockout pin 17 fixed to the first ejector plate 12 and the second rod 11 fixed to the second ejector plate 13 are both It moves along the approaching direction to the mold 6 (upward in FIG. 6). As a result, the cam block 9 fixed to the other end of the first rod, the slide block 8 fixed to the other end of the second rod, the block mold 7 engaging with this, and the knockout pin 17 The molded product 2 fixed to the other end is relatively from the second mold 6.SeparationWill be. In FIG.,The block mold 7 is separated from the second mold 6. At this time, the abutting pin 16 whose one end is fixed to the second die 6 passes through the first ejector plate 12 and is in contact with the second ejector plate 13. By this abutting pin 16, the second ejector plate 13 cannot approach the second mold 6 any more. This state is defined as the first mold release position in the present embodiment.
[0032]
  FIG. 7 shows a state at the second release position where the release has further progressed from the first release position. In the process from the first mold release position to the second mold release position, the block mold 7 is guided in a direction corresponding to the undercut angle. As shown in FIGS. 6 and 7, the second ejector plate 13 abuts against the abutting pin 16, stops in a state where the predetermined distance from the second mold 6 is maintained and the first mold release position is maintained. is doing. On the other hand, the first ejector plate 12 continues to move relatively closer to the second mold 6 from the first mold release position (FIG. 6). At this time, since the second ejector plate 13 maintains the first release position, the second rod 11 fixed to the second ejector plate 13 similarly maintains the first release position. The slide block 8 fixed to the other end of the second rod 11 also maintains the first mold release position, and the block mold 7 including the slide block guide groove 8a with which the slide block 8 slides is also the first mold release position. Maintain mold position. On the other hand, the first ejector plate 12 continues to move toward the second mold 6,thisThe first rod 10 fixed to the ejector plate 12 and the knockout pin 17 also move, and the cam block 9 and the molded product 2 at the other end also move in the same direction.
[0033]
In this way, the cam block 9 and the molded product 2 move in the opposite directions with respect to the block mold 7 that maintains the first mold release position. In order to describe this state in detail, FIG. 8 shows a cross-sectional view at the cc position shown in FIG. 7, and FIG. 9 shows a cross-sectional view at the dd position shown in FIG.
[0034]
  As shown in FIG. 9, the cam block 9 that moves together with the first ejector 12 is inserted into the cam block guide groove 9a. The cam block guide groove 9 a is provided with an angle along the undercut angle, and a cam block 9 that moves in a direction opposite to the block mold 7 is inserted therein. At this time, since the cam block guide groove 9a has an angle, the insertion of the cam block 9 causes the block mold 7 to have a first dotted line indicated by a two-dot chain line.Mold releaseFrom the position, it moves in the horizontal direction in FIG. In this way, the block die 7 is moved in the lateral direction by the slide mechanism of the slide block die 8 shown in FIG. 8 and the slide block guide groove 8a in which it slides. That is, the insertion of the cam block 9 into the cam block guide groove 9a pushes up the block mold 7 in the opposite direction relative to the movement direction of the block mold 7 (upward in the figure). The upper fixed slide block 8 resists this and maintains the position of the block mold 7. The slide block 8 slides in the slide block guide groove and slides along a direction substantially perpendicular to the moving direction of the second mold 6. In this way, the block mold 7 moves in the horizontal direction as shown in FIGS. A diagram showing the movement state of the block mold 7 in plan view is shown in FIG. As shown in FIG. 10, the position of the block mold 7 at the first mold release position indicated by the two-dot chain line is the position indicated by the solid line at the second mold release position. Sliding in the direction.
[0035]
Here, the action of the knockout pin 17 is further added. The knockout pin 17 moves in the opposite direction to the block die 7 together with the first ejector pin 12, and pushes up the molded product 2 in this direction.
[0036]
  In this way, the block mold 7 slides in the horizontal direction in the figure and is molded.GoodsBy moving 2 upward in the figure, the positions of the molded product 2 and the block mold 7 are shifted in an oblique direction having a predetermined angle. As a result, the block mold 7 is guided in a direction corresponding to the undercut angle, and the molded product 2 is released from the block mold 7 without receiving any resistance. Incidentally, the mold clamping can be performed by a step reverse to the mold release described above.
[0037]
As described above, the guide direction of the block mold 7 that is the point of mold release can be set by the shape of the cam block guide groove 9a, so that there are few restrictions on the design of the mold and the degree of freedom in product design is large. Similarly, a product change such as a change in the mold release direction can be easily handled by changing the shape of the cam block guide groove 9a. In addition, since the structure centering on the second mold 6 and the block mold 7 is adopted, the mold component unit can be made compact, and restrictions on the outer dimensions of the mold and restrictions on the establishment of the layout with other component units. , The adjustment with the temperature adjustment water hole layout inside the second mold 6 is easy, and there is no inconvenience that the mold temperature adjustment failure occurs due to the new mechanism. In addition, since the number of parts of the mold configuration unit is reduced and the number of parts that require assembly adjustment is also reduced, the manufacturing cost and running cost of the entire injection molding apparatus can be reduced.
[0038]
<First embodiment>
This 1st Example is an Example regarding the shape of the slide block 8 and the slide block guide groove 8a among the guide means demonstrated previously. This is shown in FIG. FIG. 11 is a view showing the cam block guide groove 9a, the cam block 9, the slide guide groove 8a, and the slide guide groove 8 with the block mold 7 as the center. The slide guide groove 8a and the slide guide 8 shown in FIG. 2 are rectangular, but in this embodiment, they are substantially cylindrical members. Thereby, the workability of the slide guide groove 8a can be improved.
[0039]
<Second embodiment>
The second embodiment can be positioned as another example of the driving mechanism for the guide means described above. Also in this embodiment, the block mold 7 moves from the mold opening to the first mold release position and the second mold release position, and the block mold 7 has an undercut angle from the first mold release position to the second mold release position. The operation is the same as that of the embodiment described above. Here, the redundant description is omitted, and the configuration and operation related to the drive control at the first mold release position will be described with reference to FIGS. FIG. 12 is an explanatory front sectional view of the injection molding apparatus according to the second embodiment in the state before mold opening to mold release, and FIG. 13 is in the middle of mold release of the injection molding apparatus according to the second embodiment. FIG. 14 is a side sectional view of the injection molding apparatus of FIG. In these figures, the description described here is mainly shown, avoiding redundant description. FIG. 12 is a diagram showing a state after the mold is opened. Each configuration will be described with reference to this figure. In this figure, it has the 1st ejector plate 12, the 2nd ejector plate 13, and the attachment board 22 arrange | positioned in parallel with these. The second ejector plate 13 is elastically pressed against the first ejector plate 12 by a spring 21 fixed to the mounting plate 22. The support pin 18 supports the mounting plate 22, the first ejector plate 12, and the second ejector plate 13. A mechanism for controlling driving of the first ejector plate 12 and the second ejector plate 13 is a link 19 and a link pin 20. In this embodiment, the link 19 is fixed to the mounting plate 22 and has a link groove 19a, and the link pin 20 is fixed to the second ejector plate 13 and slides on the link groove 19a. Without being limited thereto, the link 19 can be fixed to either the mounting plate 22 or the second ejector plate 13, while the link pin 20 that slides in the link groove 19 a is attached to the mounting plate 22 or the second ejector plate 13. It can be fixed to either one of the second ejector plates 13. That is, since it is only necessary to determine the positional relationship between the mounting plate 22 fixed to the second mold 6 and the second ejector plate, the link 19 and the link pin are either the mounting plate 22 or the ejector plate 13, respectively. It only has to be fixed to the crab
[0040]
Next, the operation from the mold opening position to the first mold release position will be described. FIG. 13 shows a state at the first release position. The second ejector plate 13 pressed against the first ejector plate 12 by the spring 21 moves relative to the second die 6 together with the first ejector plate 12. At this time, the link pin 20 that moves together with the second ejector plate 13 slides in the link groove 19 a provided in the link 19. The link groove 19a is provided along the link 19 as shown in FIG. Since the link pin 20 slides on the link groove 19a, the movement of the link pin 20 is stopped when it abuts against the end of the link groove 19a. Then, the second ejector plate 13 stops at a predetermined position with respect to the mounting plate 22. In this embodiment, this state is the first release position. The operation from here is the same as in the above-described embodiment. The slide cam block 8 and the block mold 7 together with the stopped second ejector plate 13 maintain the first release position, and together with the first ejector plate 12, The cam block 9 and the molded product 2 move in a direction opposite to the block mold 7, the cam block 9 is inserted into the cam block guide groove 9a, the slide block 8 slides in the slide block guide groove 8a, and the block mold 7 is guided in a direction corresponding to the undercut angle with respect to the molded product 2 to release the mold, and the same effect as in the above embodiment can be obtained.
[0041]
With such a configuration, even if there is no configuration corresponding to the guide pin 14 shown in FIG. 6 that supports the first ejector plate 12 and the second ejector plate 13, the same effect can be obtained by the same operation. The number of parts can be reduced. The embodiment described above is described in order to facilitate understanding of the present invention, and is not described in order to limit the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.
[Brief description of the drawings]
FIG. 1A is a view showing the shape of a molded part obtained by an injection molding apparatus according to the present embodiment. FIG.1 (b) is a figure which shows the aa cross section of the molded component shown in Fig.1 (a).
FIG. 2 is an explanatory front sectional view of the injection molding apparatus according to this embodiment in a state before completion of mold opening and before extrusion.
FIG. 3 is a side cross-sectional explanatory view at position c of the injection molding apparatus of FIG.
4 is a side cross-sectional explanatory view of the injection molding apparatus in FIG. 2 at position d. FIG.
5 is an explanatory plan view of the injection molding apparatus of FIG. 2. FIG.
FIG. 6 is a front cross-sectional explanatory view at a first mold release position in the middle of mold release of the injection molding apparatus according to the present embodiment.
FIG. 7 is a front cross-sectional explanatory view at a second mold release position of mold release completion of the injection molding device according to the present embodiment.
8 is a side cross-sectional explanatory view at position c of the injection molding apparatus of FIG.
FIG. 9 is a side cross-sectional explanatory view at the position d of the injection molding apparatus of FIG. 7;
10 is an explanatory plan view of the injection molding apparatus of FIG. 7. FIG.
FIG. 11 is a diagram for explaining the first embodiment;
FIG. 12 is an explanatory front sectional view of the injection molding apparatus according to the second embodiment in a state before mold opening to mold release.
FIG. 13 is an explanatory front sectional view of the injection molding apparatus according to the second embodiment in the middle of mold release.
14 is an explanatory side view of the injection molding apparatus of FIG. 12. FIG.
FIG. 15A is a side cross-sectional explanatory view for showing an example of a conventional undercut processing structure, and FIG. 15B is a plan explanatory view thereof.
FIG. 16 (a) is a side sectional view for illustrating another example of a conventional undercut processing structure, and FIG. 16 (b) is at the bb position shown in FIG. It is front sectional explanatory drawing, and FIG.16 (c) is the plane explanatory drawing similarly.
[Explanation of symbols]
1 ... Injection molding device
10: Injection molding apparatus according to the first embodiment
20 ... Injection molding apparatus according to the second embodiment
2 ... Molded product
2a ... Undercut part
3 ... Cavity
5 ... 1st type
6 ... Second mold
7 ... Block type
8 ... Slide block
8a ... Slide block guide groove
9 ... Cam block
9a ... Cam block guide groove
10 ... first rod
11 ... Second rod
12 ... 1st ejector plate
13 ... Second ejector plate
14 ... Guide pins
15 ... elastic body
16 ... Abutting pin
17 ... Knockout pin
18 ... Support pin
19 ... Link
19a ... Link groove
20 ... Link pin
21 ... Spring
22 ... Mounting plate

Claims (5)

A first mold;
A second mold that moves relatively close to and away from the first mold;
Of the molded product molded by the first mold and the second mold, at least an undercut portion having a predetermined undercut angle with respect to the moving direction of the second mold is molded, and the second mold A block mold that is detachably fitted to the mold and moves in a direction opposite to the moving direction of the second mold,
The block mold includes guide means for guiding the block mold detached from the second mold in a direction according to the undercut angle.
The guide means includes a cam block guide groove provided in the block mold along the predetermined undercut angle direction;
A cam block that moves in a direction opposite to the moving direction of the block type and is inserted into the cam block guide groove;
The block mold includes a slide block guide groove provided in the block mold along a direction substantially perpendicular to the moving direction of the second mold,
An injection molding apparatus comprising: a slide block that slides into the slide block guide groove. The slide block, the slide block guide groove injection molding apparatus according to claim 1, wherein the substantially cylindrical member whose axial direction and a direction a direction substantially perpendicular provided. The guide means includes
During the period from the mold opening position to the first mold release position, the block mold and the molded product are moved in the opposite directions relative to the second mold,
The injection according to claim 1 or 2 , wherein the cam block and the molded product are moved in the opposite directions relative to the block mold during the period from the first mold release position to the second mold release position. Molding equipment. The guide means includes
A first ejector plate that moves relative to and away from the moving direction of the second mold;
A second ejector plate having an elastic body, one end of which is elastically pressed against the first ejector plate by a guide pin fixed to the first ejector plate;
One end is fixed to the first ejector plate, and the other end is a knockout pin that contacts the molded product,
One end is fixed to the first ejector plate, and the other end is a first rod fixed to the cam block;
One end is fixed to the second ejector plate, and the other end is a second rod fixed to the slide block;
One end portion is fixed to the second mold, and the other end portion is disposed so as to penetrate the first ejector plate and contact the second ejector plate at the first mold release position. An abutment pin, and
During the period from the mold opening position to the first mold release position, the first ejector plate and the second ejector plate move relatively closer to the second mold, and the first ejector plate moves toward the first mold release position. During the period from the mold release position to the second mold release position, the first ejector plate moves relatively closer to the second mold, and the second ejector plate is moved to the first mold by the abutment pin. The injection molding apparatus according to claim 3 , wherein the mold release position is maintained. The guide means includes
A mounting plate provided in a fixed position with respect to the second mold;
A first ejector plate that moves relative to and away from the moving direction of the second mold;
One end is a second ejector plate that is elastically pressed against the first ejector plate by a spring fixed to the mounting plate;
One end is fixed to the first ejector plate, and the other end is a knockout pin that contacts the molded product,
One end is fixed to the first ejector plate, and the other end is a first rod fixed to the cam block;
One end is fixed to the second ejector plate, and the other end is a second rod fixed to the slide block;
A link fixed to either the mounting plate or the second ejector plate and having a link groove;
A link pin fixed to either the mounting plate or the second ejector plate and sliding in the link groove;
During the period from the mold opening position to the first mold release position, the first ejector plate and the second ejector plate move relatively closer to the second mold, and the first ejector plate moves toward the first mold release position. During the period from the mold release position to the second mold release position, the first ejector plate moves relatively closer to the second mold and the link pin abuts against the end of the link groove. The injection molding apparatus according to claim 3 , wherein the second ejector plate maintains the first release position.

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