JP3734738B2 - Injection mold - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an injection mold having a slide core.
[0002]
[Prior art]
Some injection molds include a fixed mold, a movable mold corresponding to the fixed mold, and a slide core provided on the movable mold.
[0003]
Conventionally, there are slide cores composed of one core component and those composed of a plurality of core components. In a slide core composed of one core constituent part, a surface for forming the shape of the injection molded product must be formed in one core constituent part, so that it is difficult to make an injection molded product having a complicated shape. In a slide core composed of a plurality of core constituent parts, the surface for forming the shape of the injection molded product is divided and formed into individual core constituent parts, so that it is easy to make an injection molded product having a complicated shape.
[0004]
At the time of injection molding, a plurality of core components are integrally laminated and treated in the same manner as a single core component.
[0005]
[Problems to be solved by the invention]
As described above, a slide core composed of a plurality of core constituent parts is used when molding an injection-molded product having a complicated shape. However, depending on the shape of the injection-molded product, the injection-molded product is not easily removed from the slide core. It was. The plurality of core components are pulled away from the injection-molded product at a stretch when the mold is opened. That is, all of the plurality of core constituent parts are simultaneously separated from the injection molded product.
[0006]
For this reason, the injection molded product may be cracked, or a part of the injection molded product may be broken and remain on the slide core.
[0007]
The present invention has been made in view of such circumstances, and an object thereof is to provide an injection mold that can be extracted from a slide core without damaging an injection molded product when the mold is opened.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, an injection mold according to the invention of claim 1 is provided with a fixed mold, a movable mold corresponding to the fixed mold, and the movable mold. Slide core having a plurality of core constituent parts, and slide timing for sliding at least one core constituent part of the plurality of core constituent parts away from the injection molded product later or earlier than other core constituent parts Control means, and the slide timing control means is provided on the slide core and holds the core component, and a plurality of first guides provided on the holder and located on both sides of the core component. parts and the respectively provided in a plurality of core components, and a plurality of second guide portions which are connected so as to be relatively slidable in the first guide portion, the plurality of first And at least one second guide portion of the plurality of second guide portions when the slide core slides in a direction away from the injection molded product. The second guide portion is set to abut on the front edge of the first guide portion at a different timing .
[0009]
As described above, since the slide timing control means for sliding at least one of the plurality of core components in the direction of moving away from the injection-molded product later or earlier than the other core components is employed, Since the plurality of core components are separated from the injection-molded product mold at the timing when the mold is displaced, a large load is not applied to the injection-molded product at one time.
[0011]
As described above, the configuration of the slide timing control means is simple.
[0012]
Injection mold of the invention of claim 2 is the injection mold according to claim 1, wherein it has a biasing member for biasing direction toward said core component to said injection-molded article It is characterized by.
[0013]
As described above, the injection mold according to the invention of claim 2 has a biasing member that biases the core component in a direction approaching the injection molded product. When the core component having the earlier sliding order starts to slide, the core component having the slower sliding order is pressed against the injection molded product by the urging force of the urging member. Therefore, the core constituent part with the early sliding order can easily be removed from the injection molded product, and the adjacent core constituent part with the late sliding order does not follow the slide start operation of the core constituent part with the early sliding order.
[0014]
The injection mold according to the invention of claim 3 is the injection mold according to claim 1 or 2, wherein the first guide part is a plurality of long grooves, and the second guide part is the core component. provided on both sides, extends to the sliding direction of the core components, and wherein the Ru protrusions der engaging said elongated groove.
[0015]
As described above, the first guide portion has a plurality of elongated grooves extending in the sliding direction of the core component, the second guide portion is the core component of the protrusions der as they may provided on both sides, the elongated groove The slide timing of each core component can be changed by adjusting the length in the sliding direction.
[0016]
The injection mold according to a fourth aspect of the present invention is the injection mold according to the first or second aspect, wherein the first guide portion is a plurality of long grooves, and the second guide portion is the core component. provided on both sides, extends to the sliding direction of the core components, and wherein the Ru protrusions der engaging said elongated groove.
[0017]
As described above, the first guide part is a plurality of long grooves, and the second guide part is provided on both sides of the core constituent part, extends in the sliding direction of the core constituent part, and engages with the long groove. protrusions der as they may be, you can change the timing of sliding of the core component by adjusting the sliding direction of the length of the protrusion.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
1 is an exploded perspective view of a slide core provided in an injection mold according to a first embodiment of the present invention, FIG. 2 is a perspective view after assembly of the slide core shown in FIG. 1, and FIG. FIG. 4A is a plan view, FIG. 4B is a side view, FIG. 4C is a cross-sectional view taken along line AA of FIG. 4A, and FIG. 3 (b) is an enlarged view of portion B, FIG. 5 is an enlarged view of portion C of FIG. 3 (c), FIG. 6 is a side view when the injection mold according to the first embodiment is closed, and FIG. FIG. 8 is a side view when the injection mold shown in FIG. 6 is opened, and FIG. 8 is an enlarged sectional view showing the operation of the injection mold shown in FIG.
[0020]
As shown in FIGS. 6 and 7, the injection mold includes a fixed mold 3, a movable mold 5, and a slide core 7.
[0021]
The fixed mold 3 includes a cavity portion 31, a fitting portion 32, and a guide rod 33. The cavity part 31 has a cavity 31a. The cavity 31 a forms the upper half excluding one end of the injection molded product 100. The fitting part 32 is fitted to the upper part of the slide core 7. The guide bar 33 is inclined at a predetermined angle with respect to the vertical direction a, and is inserted / removed relative to an engagement hole 79d of the slide core 7 described later.
[0022]
The movable mold 5 is movable along the vertical direction a, and is combined with the fixed mold 3 when positioned at the highest position. The movable mold 5 includes a cavity portion 51 and a mounting portion 52. The cavity 51 has a cavity 51a. The cavity 51 a forms the lower half excluding one end of the injection molded product 100. In the cavity portion 51, two ejector pins 53 that push the injection molded product 100 out of the cavity 51a are provided so as to be movable in the vertical direction a.
[0023]
As shown in FIGS. 1, 2, and 3, the slide core 7 includes first, second, and third core components 71, 72, 73, a holder 74, a slide base 79, a holder fixing member 80, and an urging member. 81 and a bolt 82. The slide core 7 is disposed on the upper surface of the mounting portion 52 of the movable mold 5 so as to be movable along the slide direction s.
[0024]
The first, second and third core constituent parts 71, 72, 73 can be slid independently in the sliding direction s, and are adjacent to each other in the vertical direction a. Each of the first, second, and third core constituting parts 71, 72, 73 is plate-like, and its planar shape is substantially convex. First convex portions 71 a are provided on both sides of the first core constituting portion 71. A first recess 71 b that forms an upper portion of one end of the injection molded product 100 is provided at the tip of the first core component 71. Second convex portions 72 a are provided on both sides of the second core constituting portion 72. A second recess 72 b that forms a central portion of one end of the injection molded product 100 is provided at the tip of the second core component 72. A pin portion 72c that forms a hole 100a at one end of the injection molded product 100 is provided at the center of the second recess 72b. Third convex portions 73 a are provided on both sides of the third core constituting portion 73. A third recess 73 b that forms a lower portion of one end of the injection molded product 100 is provided at the tip of the third core component 73. The length of the first convex portion 71a in the sliding direction s is equal to the length of the second and third convex portions 72a and 73a in the sliding direction s. Further, when the tips of the first, second and third core constituent parts 71, 72, 73 are aligned at the same position, the positions of the first, second and third convex parts 71a, 72a, 73a in the sliding direction s are Everyone is the same.
[0025]
The holder 74 holds the first, second and third core constituent parts 71, 72, 73. The holder 74 includes a base 75, a pair of left and right guide plates 76, 76, an upper plate 77 and a pin 78.
[0026]
The base 75 has a fixed portion 75a and a mounting portion 75b. The fixing portion 75a has a substantially block shape, and is fixed in an accommodation recess 79c of a slide base 79 described later. Four counterbore 75c are formed on the rear surface of the fixed portion 75a (see FIG. 3C). Four holes 75d communicating with the spot facings 75c are formed on the front surface of the fixed portion 75a. The mounting portion 75b is substantially plate-shaped and is connected to the lower portion of the front surface of the fixed portion 75a. Stacked first, second, and third core components 71, 72, 73 are mounted on the upper surface of the mounting portion 75b.
[0027]
The pair of guide plates 76, 76 is plate-shaped. The guide plate 76 is formed with first, second and third elongated holes 76a, 76b and 76c. The first, second, and third elongated holes 76a, 76b, and 76c extend in the sliding direction s, respectively, and receive the first, second, and third protrusions 71a, 72a, and 73a in a movable manner. The length of the first elongate hole 76a in the slide direction s is longer than the length of the second elongate hole 76b in the slide direction s, and is equal to the length of the third elongate hole 76c in the slide direction s. The rear positions of the first, second, and third elongated holes 76a, 76b, and 76c in the sliding direction s are all aligned (see FIG. 4).
[0028]
The upper plate 77 has a plate shape and is bridged between a pair of guide plates 76 and 76. An insertion hole 77a having a stepped surface 77b is formed in the upper plate 77 (see FIG. 5).
[0029]
The pin 78 has a pin part 78a and a flange part 78b provided continuously with the lower end of the pin part 78a. The pin 78 is accommodated in the insertion hole 77a (refer FIG. 5).
[0030]
The slide base 79 has an engaging portion 79a, a mounting portion 79b, and an accommodating recess 79c. The engaging portion 79a has a substantially block shape. An engagement hole 79d is formed in the engagement portion 79a. This engagement hole 79d extends in the same direction as the longitudinal direction of the guide bar 33, and accepts the guide bar 33 so that it can be inserted and removed. When the guide bar 33 slides relative to the engagement hole 79d, a force for sliding the slide base 79 of the slide core 7 in the slide direction s is generated. The first, second, and third core components 71, 72, and 73 held by the holder 74 are mounted on the mounting portion 79b. The accommodating recess 79 c is formed between the engaging portion 79 a and the mounting portion 79 b and accommodates the fixing portion 75 a of the base 75 and the holder fixing member 80. Two screw holes 79e are formed in the housing recess 79c.
[0031]
The holder fixing member 80 is substantially U-shaped (or a gate pillar shape), and a bolt insertion hole 80b is formed in the post portion 80a.
[0032]
The biasing member 81 includes a pressing body 81a and a spring 81b. The pressing body 81a has a disc part 81c, a pin part 81d, and a mounting part 81e. The pin portion 81d is provided eccentric to the front surface of the disc portion 81c. The mounting portion 81e is provided concentrically with the disc portion 81c on the rear surface of the disc portion 81c. One end of the spring 81b is attached to the attachment portion 81e. As shown in FIG. 3C, the urging member 81 is accommodated in a counterbore 75 c of the base 75. The pin portion 81d of the urging member 81 protrudes from the front surface of the base 75 through the hole 75d of the base 75, and the first, second, and third core constituent members 71, 72, and 73 are moved into the cavity 31a, by the elastic force of the spring 81b. Energize towards 51a.
[0033]
The bolt 82 is screwed into the screw hole 79e through the bolt insertion hole 80b, and the holder fixing member 80 is fixed to the accommodation recess 79c. The holder 74 is fixed to the slide base 79 by the holder fixing member 80.
[0034]
In this embodiment, as shown in FIG. 4, the slide timing control means includes the convex portions 71a, 72a, 73a (second guide portion) of the first, second, and third core constituting portions 71, 72, 73 described above. The guide plate 76 is composed of elongated holes 76a, 76b, and 76c (first guide portion).
[0035]
Next, the operation of this injection mold will be described.
[0036]
When the injection mold is opened as shown in FIG. 7, when the movable mold 5 rises in the vertical direction a, the guide rod 33 of the fixed mold 3 is inserted into the engagement hole 79d of the slide core 7, While the movable mold 5 is raised, the slide core 7 is advanced along the slide direction s while being guided by the guide rod 33. Shortly before the movable mold 5 comes into contact with the fixed mold 3, the tips of the first, second, and third core constituting parts 71, 72, 73 abut against the cavity parts 31a, 51a. The portion excluding the second and third core constituent parts 71, 72, 73 advances. For this reason, the convex portions 71a, 72a, 73a of the first, second, and third core constituting portions 71, 72, 73 retreat relatively in the elongated holes 76a, 76b, 76c of the guide plate 7, respectively. When the movable mold 5 comes into contact with the fixed mold 3, the upper portion of the slide core 7 is fitted into the fitting portion 32 of the fixed mold 3. As a result, the injection mold is closed. At this time, the positions of the convex portions 71a, 72a, 73a in the long holes 76a, 76b, 76c are as shown in FIG. When the injection mold is closed, the pin 78 transmits the pressure received from the fixed mold 3 to the first, second and third core constituent parts 71, 72, 73, and the first, second and third. The gap between the core components 71, 72, 73 is minimized, and the first, second, and third core components 71, 72, 73 are integrated.
[0037]
When the resin is injected into the closed injection mold, the resin is molded by the cavities 31a and 51a and the first, second and third core constituent parts 71, 72 and 73, and the injection molded product 100 is molded. Can do.
[0038]
After the injection molded product 100 is formed, the movable mold 5 is lowered along the vertical direction a, and the injection mold is opened. At this time, the engagement hole 79d of the slide core 7 is engaged with the guide bar 33 of the fixed mold 3, and the slide core 7 is moved back along the slide direction s by the guide function of the guide bar 33. When the slide core 7 starts to retract, the first, second and third core constituting parts 71, 72, 73 of the slide core 7 do not move because they are attached to one end of the injection molded product 100. Therefore, the convex portions 71a, 72a, 73a of the first, second, and third core constituting portions 71, 72, 73 are relatively advanced at the same speed in the long holes 76a, 76b, 76c of the guide plate 7, respectively. To do. As shown in FIG. 4, since the length of the second long hole 76b is the shortest, the second convex portion 72a first hits the front edge of the long hole 76b. Thereafter, the second core component 72 is pulled rearward by the guide plate 76 and is separated from one end of the injection molded product 100. When the second core component 72 moves backward by a predetermined length d (equal to the difference between the length of the first slot and the length of the second slot), the first and third protrusions 71a, 73a are now respectively It abuts against the front edges of the first and third elongated holes 76a, 76c. Thereafter, the first and third core constituting portions 71 and 73 are also pulled rearward by the guide plate 76 and separated from one end portion of the injection molded product 100.
[0039]
As described above, first, as shown in FIG. 8, the second core constituting portion 72 is separated from one end portion of the injection molded product 100, and then the first and third core constituting portions 71, 73 are removed from the injection molded product 100. Pulled away from one end. Therefore, the force for pulling the core components 71, 72, 73 away from the injection molded product 100 is not applied to the injection molded product 100 at a time but is applied stepwise, so that excessive force does not act on the injection molded product 100.
[0040]
Next, the effect of this injection mold will be described.
[0041]
As described above, after the injection molding, the second core component 72 is first separated from the injection molded product 100, and then the first and third core components are separated from the injection molded product 100. It is possible to prevent the force from being applied sometimes, and the mold can be removed from the slide core 7 without damaging the injection molded product 100 when the mold is opened.
[0042]
Further, as described above, the slide timing control means includes the first, second and third convex portions 71a, 72a and 73a and the first, second and third elongated holes 76a, 76b and 76c. Therefore, the configuration is simple, and an injection mold can be manufactured at a cost substantially equal to that of the conventional one.
[0043]
As described above, the injection mold has the urging member 81 that urges the first, second, and third core constituent parts 71, 72, and 73 in the direction approaching the injection molded product 100. When the mold is opened, the first, second and third core constituting parts 71, 72, 73 are pressed against the injection molded product 100 by the urging force of the urging member 81. For this reason, when the second core constituent part 72 of the first slide order starts sliding, the first and third core constituent parts 71 and 73 press the injection molded product 100, so that the second core constituent part 72 is injection molded. The product 100 can be easily removed. Further, it is possible to prevent the first and third core constituent parts 71 and 73 from sliding together with the second core constituent part 72 when the second core constituent part 72 starts to slide. Therefore, each core component 71, 72, 73 can be reliably slid at a predetermined correct timing.
[0044]
As described above, the slide timing control means includes the first, second, and third convex portions 71a, 72a, 73a and the first, second, and third elongated holes 76a, 76b, 76c. By adjusting the length of the first, second, and third elongated holes 76a, 76b , 76c in the sliding direction s, the sliding timing of the first, second, and third core components 71, 72, 73 can be simplified. Can be changed to
[0045]
FIG. 9 is an enlarged sectional view showing the operation of the injection mold according to the second embodiment.
[0046]
Since the injection mold according to the second embodiment has the same configuration as the injection mold according to the first embodiment except for a part, description of the same part will be omitted. Hereinafter, only different parts from the first embodiment will be described.
[0047]
The injection mold according to the first embodiment is for forming a hole 100 a at one end of the injection molded product 100, but the injection mold according to the second embodiment is one end of the injection molded product 200. Is formed into an L-shape. Therefore, the cavity 231a of the fixed mold 203, the cavity 251a of the movable mold 205, the first recess 271b of the first core component 271 and the second recess 272b of the second core component 272 form the L-shaped injection molded product 200. It is formed in a shape that can be done.
[0048]
The slide core 7 of the injection mold of the first embodiment has first, second and third core constituent parts 71, 72, 73, but the slide of the injection mold of the second embodiment. The core 7 has only the first and second core components 271 and 272. The slide timing control means (not shown) of this embodiment is the same as the slide timing control means of the first embodiment. First, the second core component 272 is slid, and then the first core component 271 is moved. It is designed to slide. That is, similarly to the slide timing control means of the first embodiment, the length of the first convex portion (not shown) in the sliding direction s is equal to the length of the second convex portion (not shown) in the sliding direction s. The length of the first slot (not shown) in the sliding direction s is longer than the length of the second slot (not shown) in the sliding direction s.
[0049]
The second embodiment has the same effects as the first embodiment.
[0050]
Although the urging member 81 is provided in the injection mold according to the first embodiment, the urging member 81 is not always necessary.
[0051]
In the injection mold according to the first embodiment, the lengths of the first, second, and third convex portions 71a, 72a, 73a in the sliding direction s are the same, and the first, second, and third lengths are the same. The slide timings of the first, second, and third core components 71, 72, and 73 are shifted by changing the lengths of the holes 76a, 76b, and 76c in the sliding direction s, but the first, second, and third lengths are changed. The lengths of the holes 76a, 76b, and 76c in the sliding direction s are the same, and the lengths of the first, second, and third convex portions 71a, 72a, and 73a in the sliding direction s are different, and the first, second, and third The slide timing of the core components 71, 72, 73 can also be shifted.
[0052]
Further, in the injection mold according to the first embodiment, the convex portions 71a, 72a , 73a are provided in the core constituent portions 71, 72, 73, respectively, and the long holes 76a, 76b76c are provided in the holder 74. These may be reversed, and a long groove or a notch may be provided in the core constituent part, and a convex part or a pin may be provided in the holder.
[0053]
Furthermore, in the above-described embodiment, the slide timing control means is a combination of a convex portion and a long hole, but the slide timing means is not limited to this. For example, it is possible to provide a plurality of actuators for driving a plurality of core components, and to shift the slide timing of the plurality of core components by the plurality of actuators.
[0054]
【The invention's effect】
As described above, according to the injection mold of the invention of the first aspect, the slide timing control means separates the plurality of core components from the injection mold when the mold is opened. A large load at a time is not applied. As a result, when the mold is opened, the injection molded product can be extracted from the slide core without damaging it.
[0055]
According to the injection molding die of the first aspect of the invention, since the configuration of the slide timing control means is simple, the injection molding die can be manufactured at substantially the same cost as the conventional one.
[0056]
According to the injection molding die of the second aspect of the present invention, each core constituent portion slides reliably at a predetermined correct timing when the mold is opened.
[0057]
According to the injection molding die of the invention of claim 3 , the slide timing of the core component can be easily changed by adjusting the length of the long groove in the sliding direction.
[0058]
According to the injection molding die of the fourth aspect of the invention, the slide timing of the core constituent portion can be easily changed by adjusting the length of the convex portion in the sliding direction.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a slide core provided in an injection mold according to a first embodiment of the present invention.
FIG. 2 is a perspective view after the slide core shown in FIG. 1 is assembled.
3 shows the slide core shown in FIG. 2. FIG. 3 (a) is a plan view, FIG. 3 (b) is a side view, and FIG. 3 (c) is an AA line in FIG. FIG.
FIG. 4 is an enlarged view of a portion B in FIG. 3 (b).
FIG. 5 is an enlarged view of a portion C in FIG. 3 (c).
FIG. 6 is a side view when the injection mold according to the first embodiment is closed.
7 is a side view when the injection mold shown in FIG. 6 is opened. FIG.
FIG. 8 is an enlarged cross-sectional view showing the operation of the injection mold shown in FIG. 6;
FIG. 9 is an enlarged cross-sectional view showing the operation of the injection mold according to the second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 3 Fixed type | mold 5 Movable type | mold 7 Slide core 71 1st core structure part 71a 1st convex part 72 2nd core structure part 72a 2nd convex part 73 3rd core structure part 73a 3rd convex part 74 Holder 76 Guide plate 76a 1st Slotted hole 76b Second slotted hole 76c Third slotted hole 100 Injection molded product 200 Injection molded product 203 Fixed mold 205 Movable mold 271 First core component 272 Second core component

Claims (4)

Fixed type,
A movable type corresponding to this fixed type,
A slide core provided in this movable mold, and having a plurality of core components arranged adjacent to each other and capable of sliding independently;
A slide timing control means for sliding at least one core component of the plurality of core components in a direction of moving away from the injection molded product later or earlier than the other core components;
The slide timing control means is provided in the slide core and holds the core component, a plurality of first guides provided on the holder and located on both sides of the core component, Each having a plurality of second guide portions provided in the core constituent portion and connected to the first guide portion so as to be relatively slidable ;
The positions and lengths of the plurality of first and second guide portions in the sliding direction are set so that at least one of the plurality of second guide portions when the slide core slides in a direction away from the injection molded product. An injection mold , wherein the two guide portions are set to abut against the front edge of the first guide portion at a timing different from that of the other second guide portions .   2. The injection mold according to claim 1, further comprising a biasing member that biases the core component in a direction approaching the injection molded product. The first guide part is a plurality of long grooves extending in the sliding direction of the core component part,
The second guide portion, wherein provided on both sides of the core components, according to claim 1 or 2 injection mold, wherein the Ru protrusions der engaging said elongated groove. The first guide part is a plurality of long grooves,
The second guide portion, wherein provided on both sides of the core component, extends the sliding direction of the core components, according to claim 1 or 2, wherein the Ru protrusions der engaging said elongated groove Mold for injection molding.

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