JPH0193322A - Injection molding die - Google Patents

Abstract

PURPOSE:To carry out replacement quickly by mounting removably a sprue section unit, a bushing plate section unit and an ejector pin press plate respectively in the state of mounting a die set on an injection molding machine. CONSTITUTION:A fixed side fixed plate 13 and a movable side fixed plate 19 of an injection molding machine, a sprue section unit 50 consisting of a sprue bush 53 and a retaining component for the same, a fixed side bushing plate section unit 60 consisting of a fixed side bushing plate 61 and a movable side bushing plate 62, a fixed side retaining component retaining the fixed side bushing plate 61, a movable side retaining component retaining the movable side bushing plate 62, an ejector pin press plate 70 and ejector plates 23 and 24 to retain the same are mounted on an injection molding die, while a sprue section unit 50 is mounted by respective clamping components from the movable side and the fixed side bushing plate 61 is mounted on the fixed side fixed plate 13 and the fixed side retaining component, and also the movable side bushing plate 62 and the ejector pin press plate 70 are mounted on the movable side retaining component and the ejector plate by respective clamping components from the fixed side.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an injection mold, and more specifically, when installed in an injection molding machine, the sprue unit and bushing plate unit, which are the internal units of the gui set, are used. The present invention also relates to an injection mold in which the ejector pin holding plate is individually replaceable.

<Prior Art> Modern injection molded products tend to be produced in small quantities with a wide variety of products, so a wide variety of molds are required. However, in such a case, if - molds are to be manufactured for one type of injection molded product, many types of molds must be manufactured, and as a result, it takes a large number of days to manufacture the molds. Therefore, there is a drawback that the manufacturing cost of the mold is high.

That is, this type of mold has a cavity part, an ejector mechanism,
Since it has a complicated structure consisting of a return mechanism, a positioning mechanism, a temperature control mechanism, etc., it takes a long time to manufacture the device and increases the manufacturing cost.

Therefore, in order to solve this problem, the inside of the die set is made into a unit, the unit part is made detachable from the die set, and by replacing these parts as appropriate, it is possible to manufacture a wide variety of molded products. A mold (hereinafter referred to as a conventional example) has been put into practical use.

<Problems to be Solved by the Invention> However, in the case of the above-mentioned conventional example, there are the following drawbacks, so there is a problem that it cannot sufficiently cope with the recent manufacturing of molded products that requires high-mix, low-volume production. there were.

That is, (1) When replacing the unit part, it was necessary to remove the heavy die set from the injection molding machine, making the replacement work difficult and troublesome.

■Moreover, since each unit part could not be replaced individually, for example, even if only the core bushing needed to be replaced, it was necessary to take out the entire unit from the die set and disassemble it, making the replacement work very difficult. It becomes a nuisance.

■Since it was not possible to satisfy both the die set for 2 plates and the die set for 3 plates at the same time, it was necessary to replace the unit part according to each application, such as 2 plates for 2 plates and 3 plates for 3 plates. There is a certain annoyance. Here, 2-plate guiscent is a die in which the main parts of the mold such as the cavity and core are composed of two plates (template plates), and the runner and gate part are on the dividing surface of the mold. A 3-plate gusset is a type used when using a pinpoint gate, and includes two templates for housing the cavity and core, as well as a template for removing the runner (
A die set with a stripper bushing plate (stripper bushing plate) is added, and the main part consists of these three templates.

The present invention was made to solve the problems of the conventional technology, and replaces internal units such as the sprue unit, bushing plate unit, and ejector pin holding plate while the die set is attached to the injection molding machine. It is an object of the present invention to provide an injection molding mold having a structure in which each of the injection molding parts can be individually performed, and as a result, it can cope with the production of molded products which tends to be produced in a wide variety of products in small quantities.

Means for Solving Problems> The injection molding mold according to the present invention includes a fixed side fixed plate attached to the fixed side of the injection molding machine, and a movable side fixed plate attached to the movable side of the injection molding machine. , a sprue part unit comprising a sprue bushing and a sprue bushing holding member for holding the sprue bushing, a bushing plate part unit comprising a fixed side bushing plate and a movable side bushing plate, and holding the fixed side bushing plate. A fixed-side holding member that holds the movable-side bushing plate, a movable-side holding member that holds the movable-side bushing plate, an ejector pin holding plate that holds the ejector pin, and an ejector plate that holds the ejector pin holding plate, each of which is fastened from the movable side. The sprue unit is connected to the sprue unit by the fastening member.
The fixed side bushing plate is attached to the fixed side fixed plate and the fixed side holding member, respectively, and the movable side bushing plate and the ejector pin presser plate are attached to the movable side holding member and the ejector plate, respectively, by fastening members fastened from the fixed side respectively. Installation.

<Function> In such a case, when the mold is opened, each fastening member can be loosened with the fixed side fixing plate and the movable side fixing plate attached to the injection molding machine, so in this state, the sprue unit and the bushing plate unit can be loosened. And the ejector pin holding plate can be replaced.

<Example> Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan sectional view showing the overall structure of an injection mold according to the present invention, and FIG.
A sectional view showing the state cut at the position indicated by line A, Fig. 3 (
a) is an exploded perspective view showing the main parts of the fixed side grip set;
Figure (b) is an exploded perspective view showing the main parts of the movable die set;
Figure 4(a) is an exploded perspective view showing the main parts of the sprue unit, Figure 4(b) is a perspective view showing a modification of the sprue unit, and Figure 5 is an exploded perspective view showing the main parts of the bushing plate unit. Perspective views, Figures 6(a) and (b) are perspective views showing the state before and after the sprue unit is attached to the stationary side fixing plate and stripper plate, respectively, and Figures 7(a) and (b). 8A and 8B are perspective views showing the state before and after the fixed side bushing plate is attached to the fixed side bushing plate holder, respectively. Figures 8(a) and 8(b) show the movable side bushing plate and ejector turbine holder on the movable side die set. FIGS. 9(a) and 9(b) are perspective views showing the state before and after the plate is attached, respectively, and FIGS. 9(a) and 9(b) are perspective views showing the external structures of the movable die set and the fixed die set, respectively.

The die set 10 of this injection mold is formed by assembling a fixed side die set 11 located on the left side of the figure in FIG. 1 and a movable side die set 18 located on the right side of the figure. A nozzle (not shown) of an injection molding machine is connected to the left end surface of the sprue bush 53 provided on the die set 11, and the joint between the fixed side die set 11 and the movable die set 18, more specifically, is connected through this nozzle. There is a fixed side bushing plate 61 and a movable side bushing plate 62.
For example, thermoplastic plastic is poured into a cavity (not shown) provided in a cavity block 68 formed in a bushing plate unit 60 consisting of a bushing plate unit 60, and after it hardens, the movable die set 18 is opened. This is the basic structure that allows injection molded products to be obtained.

The details of the fixed die set 11 and the movable die set 18 will be explained in order below. 13 is a fixed side fixing plate located on the leftmost side in the figure of the fixed side die set 11;
It is connected to a stationary platen (not shown) of the injection molding machine. The fixed side fixing plate 13 has a square shape as shown in FIG.
3a is formed.

This groove 13a is for attaching a sprue unit 50, which will be described next. A U-shaped stripper plate 14 is fastened to the right side surface of the fixed side fixing plate 13 using a stop bolt 33. Stripper plate 14
The width of the opening is set between that of the groove 13a and the width of the groove 13a. However, the inner ends on both sides of the opening are provided with locking portions 14a, 14a that protrude slightly inward.

Now, as shown in FIG. 4(a), the sprue unit 50 has a vertically elongated rectangular shape with the sprue bush 53 and a step 51a that is slightly wider on the left side in the middle part in the thickness direction. , a holding hole 51 provided approximately in the center of the plate surface.
A sprue holding plate 51 that holds the base end of the sprue bushing 53 inside b has approximately the same shape as the sprue holding plate 51, is attached to the right side of this plate, and has a sprue holding plate 51 in a similar holding hole 52a. The stripper bushing plate 52 holds the tip of the bushing 53, and the fixed side fixing plate 13 and the stripper bushing plate 1
It is removable from 4.

Specifically, the sprue holding plate 51 is temporarily fixed to the fixed side fixing plate 13 by inserting it into 113a from above, for example, and then the fixed side fixing plate 13 is attached from the movable side (right side). Bolt 3 fastened to 13
0, the attachment to the fixed side fixing plate 13 is performed. That is, when the bolt 30 is fastened, the collar 30a attached thereto is fixed by fitting into the counterbore hole 13b provided at a predetermined position of the fixing plate 130 and the stepped portion 51a which is flush with the counterbore hole 13b. The sprue holding plate 51 can be reliably attached.

In addition, in the above-mentioned temporarily fixed state, the groove lower surface 13 of 113a
comes into contact with the lower surface of the sprue holding plate 51, so that the sprue holding plate 51 is positioned in the height direction. Here, the shape of the fixed side fixing plate 13 is not limited to the above-mentioned one, but a groove 13a may be formed over the entire length in the vertical direction, and a separate positioning member may be fitted in a portion near the bottom of the groove 13a. You may decide to take the form of When such a form is adopted, there is an advantage that processing becomes easy.

Similarly, the stripper bushing plate 52 is temporarily fixed to the stripper plate 14 by inserting it into the opening of the stripper plate 14 from above.
When the bolt 32 is fastened to the stripper plate 14 from the fixed side, the collar 32a attached to the bolt 32a is attached to the left side of the flange portion 56 that protrudes on both front and rear sides of the sprue holding plate 51, and the left side of the stripper plate 14 that is flush with this. The stripper bushing plate 52 is fitted into the surface step portion 14b, and the stripper bushing plate 52 can be securely attached to the stripper plate 14. In this mounting state, the locking portions 14a receive and support the flange portions 56 and 56 on both sides. In the illustrated example, the bolt 30 and the collar 30a attached to the bolt 30 are used for fixing, but it goes without saying that the bolt 30 may be fixed using a flanged bolt instead.

Here, in the mold of the present invention, the sprue unit 50
More specifically, the reason why the sprue holding plate 51 is attached to the stationary side fixing plate 13 by the bolts 30 fastened from the movable side is that the sprue unit 50 can be replaced with the Guiset 10 attached to the injection molding machine. This is to make it possible.

That is, when such a mounting structure is used, when the mold of the present invention is opened and the space between the stationary side fixing plate 13 and the stripper plate 14 is opened, an appropriate gap will be formed between them. This gap can be used to release the bolt 30 from the fastened state. Consequently, the sprue unit 50 can be replaced while the goose set 10 is attached to the injection molding machine. Note that when performing this replacement work, it goes without saying that the bolts 32 must be unfastened, and the entire mold opening operation will be described later.

Now, a sprue bushing 53 is inserted into the holding holes 51b and 52a of the sprue holding plate 51 and the stripper bushing plate 52, and molten plastic is supplied through a nozzle connected to the left end surface of the sprue bushing 53. is injected into a cavity (not shown) formed in the cavity block 68 through the sprue runner 53a provided in the sprue bushing 53 and the runner 69 provided in the fixed side bushing plate 61, thereby completing the injection molding. is now being carried out.

Note that 12 is a locate ring for aligning the nozzle and the sprue bush 53. Further, 54 is a runner lock pin having a locking portion 54a formed at its tip inserted into the runner 69. This runner port/pick pin 54 is connected to the stripper plate 14, the sprue holding plate 51, and the stripper bushing plate 5 as described above.
This is a unique part installed in the three-plate mold having the sprue runner 53a and the runner 69, and functions to release unnecessary parts that will be molded into the sprue runner 53a and runner 69 from the mold.

That is, when the space between the stripper plate 14 and the stationary bushing plate 61 is first opened after molding, the stationary bushing plate 61 moves to the movable side, and with this movement, the frictional resistance within the runner 69 causes the molding to occur in this part. The unnecessary parts of the sprue runner 53a and the runner 6 are also not moved to the movable side.
The entire unnecessary portion within the bushing plate 9 is prevented from moving toward the movable side, and the unnecessary portion is then released from the fixed side bushing plate 61.

Next, when the fixed side fixed plate i3 and the stripper plate 14 are opened, the stripper bushing plate 52 attached to the stripper plate 14 moves to the movable side, so that the unnecessary By pressing the portion toward the movable side, the unnecessary portion is released from the sprue bush 53.

In the above description, the mold of the present invention is applied to a three-plate mold, but the mold of the present invention is also configured to be applicable to a two-plate mold. That is,
When the sprue holding plate 51 and the stripper bushing plate 52 are connected, and the stripper plate 14 and the fixed bushing plate holding body 16 described below are connected by the connecting member 17 shown in FIG. 3(a), these connecting parts are connected. This prevents the mold from opening, and as a result, the main part of the mold becomes the two-plate mold consisting of two mold plates, the fixed bushing plate 61 and the movable bushing plate 62. When used as a two-plate mold, it goes without saying that the sprue holding plate 51 and stripper bushing plate 52 may be integrated as shown in FIG. 4(b). Moreover, parts specific to the three-plate mold, such as the runner lock pin 54, are not required.

Therefore, when it is possible to select between a two-plate mold and a three-plate mold as described above, it is possible to manufacture various molded products by simply replacing the necessary parts without replacing the Guiset 10 itself. It has the advantage of becoming

A cab back plate 15 is attached to the right side of the stripper plate 14, with a stationary bushing plate holding body 16 fixed to the right side. The cab back plate 15 has a substantially same U-shape as the stripper plate 14, but the width of the opening is slightly wider than that of the stripper plate 14. The fixed side bushing plate presser main body 16 includes three fixed side bushing plate pressers 16a each having a prismatic shape.
, 16b, and 16C are assembled in a U-shape. Width dimension of the opening of the fixed side bushing plate main body 16, i.e. the fixed side bushing plates located on both the front and back sides 16a
, 16b are slightly wider than that of the cab back plate 15, so that in the fixed state, step portions 15a, 15a are formed between the two. These stepped portions 15a, 15a are used for positioning a stationary side bushing plate 61 to be attached thereto as will be described later.

Here, the cab back plate 15 is attached to the stripper plate 14 using a stop bolt 31 whose threaded end is fastened to the stationary fixing plate 13 as shown in FIG. A hole 15 having a diameter larger than the head of the stop bolt 31 is located in the part of the back plate 15 where the base end of the stop bolt 31 is located.
b is provided so that the cavity back plate 15 can be opened with respect to the stripper plate 14. Furthermore, the fixed side bushing plate retainer 16 is attached to the cab back plate 15 by using bolts 160, 160, and 160 fastened to the lower ends of both of them after positioning them using knock pins (not shown). ing.

In addition, in the illustrated example, the fixed side bushing plate retainer 16a
, 16b, and 16c are assembled to form the stationary bushing plate press body 16, but the stationary bushing plate press body 16 may be obtained by processing a single plate.

However, the former form has the advantage of easy processing.

And fixed side bushing plate presser 16a116b
As shown in FIGS. 3(a) and 7(a), two counterbore holes 34 and 34 are provided on the upper and lower sides of the facing surfaces of the fixed side bushing plate retainer 16a located on the front side.
A screw hole 35 is formed in the central portion of the body to penetrate in the front-rear direction. The counterbore holes 34 and 34 are fastened here, and the bolts 161 and collars 1618 that fix the stationary side bushing plate 61 to the connection body between the cab back plate 15 and the stationary side bushing plate retainer body 16 are installed at the appropriate positions. It is now used to configure settings.

Here, as shown in FIG. 1, the bolt 161 is fastened to the cab back plate 15 from the movable side through the fixed side bushing plate retainer 16b, and the collar 161a attached to this bolt is fastened to the fixed side bushing plate 61 in the same manner as described above. Installation is now possible. However,
If such a mounting structure is used, open the mold between the fixed bushing plate 61 and the movable die set 18, and loosen the bolts 161 to attach the die set 10 to the injection molding machine. plate 61
can be exchanged.

Note that the mold opening between the stationary side bushing plate 61 and the movable side die set 18 is performed using the stripper plate 1 described above.
4 and the fixed side bushing plate 61, and after the mold opening between the stripper plate 14 and the fixed side fixed plate 13. Specifically, in Fig. 2, the movable side die set 18 to the right, the right end surface of the stationary side bushing plate presser body 16 comes into contact with the head of the stop bolt 33 and its movement is obstructed, so the stationary side bushing plate 61 and the movable die set There will be 18 mold openings.

In addition, the screw holes 35 are positioned and tightened using the rod 64 of the mechanism part A on the fixed side bushing plate 6, which will be described later.
1 to the stationary side bushing plate presser body 16 more securely.

Note that the four corners of the stationary die set 11 have, for example, a third die.
As shown in Figure (a), four guide pins 110...
is provided protruding toward the movable side, and the stripper plate 1
4 and the cab back plate 15 and fixed side bushing plate presser body 16, these guide pins 110 ... are connected to engagement holes provided at corresponding positions of the cab back plate 15 and fixed side bushing plate presser body 16. This allows these connections to be made in alignment. On top of that, the tips of the guide bins 110...
), and when this protrusion joins the fixed die set 11 and the movable die set 18, the protrusion shown in FIG.
) It is designed to engage with the engagement hole provided at the corresponding position of the movable die set structure, and thereby the mold opening and mold closing operations of both can be performed smoothly. Note that the guide bin 1 that also extends to the movable die set 18
80... are provided to perform the same functions as above.

Now, as shown in Fig. 5, the fixed side bushing plate 6
1 has a rectangular parallelepiped shape with a square hole 61a in the center, and vertical engaging protrusions 66, 66 in the center of the thickness direction on both front and rear sides.
When the fixed side bushing plate 61 is inserted and mounted from above into the connection body of the cab back plate 15 and the fixed side bushing plate presser main body 16, the engaging protrusions 66 and 66 are attached to the above-mentioned step as shown in FIG. Part 15a, 1
5a. In addition, an inclined surface 63 that is inclined downward and to the right is recessed in the front side surface of the stationary side bushing plate 61, and this inclined surface 63
By using this, the fixed side bushing plate 61 can be attached to the fixed side bushing plate presser body 16 even more precisely and reliably.

That is, the inclined surface 63 has an inclined surface corresponding to its inclination angle at its tip, and the rod 64 connected to the mechanical component A is butted against the proximal end for positioning and tightening. A specially shaped bolt 80 located on the proximal end side of the mechanism part A is fastened to the tapped hole 35, and the rod 64 that comes into contact with the inclined surface 63 in the fastened state is connected to the fixed side bushing. Press the plate 61 backward, downward and to the right, and press the fixed side bushing plate 6.
The corresponding surface of 1 is the fixed side bushing plate presser 1
6b, the upper surface of the fixed bushing plate holder 16c, and the left end surface of the movable bushing plate 62, respectively. Therefore, the positioning and attachment of the stationary bushing plate 61 can be performed more accurately and reliably.

Here, as described above, the fixed side bushing plate 61 constitutes the bushing plate unit 60 with the movable side bushing plate 62, which will be described next.
The interior of the cavity block 68, which will be provided in both square holes 61a and 62a, constitutes a cavity.

Next, details of the movable die set 18 will be explained. 1
Reference numeral 9 denotes a movable-side fixed plate located at the oldest side of the movable-side die set 18, and is connected to the movable-side platen of the injection molding machine. The movable side fixed plate 19 has a square shape, and has a plurality of ejector rod insertion holes 1.9a in the vertical direction (only one in the drawing), into which an ejector rod (not shown) is inserted from the right side, in the middle part in the front and back direction. (appearing) is a provision.

Here, the ejector rod functions to take out the molded product from the movable bushing plate 62, and when advanced to the fixed side, it moves the ejector pin 71 held by the ejector pin holding plate 70, which will be described next, to the fixed side. The tip of the ejector pin 71 presses the molded product toward the fixed side, and the molded product can now be taken out from the movable bushing plate 62.

Now, spacer blocks 20.20 are connected to both the front and rear sides of the movable side fixed plate 19.
On the inner side of 20 is a U-shaped core back plate 21.
is concatenated. A movable bushing plate presser main body 22 is connected to the left side surface of the core back plate 21. The movable bushing plate retainer body 22 has three movable bushing plate retainers 22a, 22b, similar to the fixed bushing plate retainer body 16.
22c are combined in a U-shape. The movable bushing plate holding body 22 and the core back plate 21 are connected by bolts 220.220.2 which are fastened to the lower ends of both after positioning with knock pins (not shown) in the same manner as described above.
20.

The distance between the movable bushing plate retainers 22a and 22b is slightly larger than the width of the opening of the core back plate 21, and the step 2 formed at the connection between the two
1a and 21a are used for positioning the movable bushing plate 62 that will be installed inside this part. Note that a method for inserting the movable bushing plate 62 will be described later.

A spacer block 20 is provided on the inner surface of the movable side fixed plate 19.
20 so that it is sandwiched between the right ejector plate 2
3 are attached to the upper end of the right ejector plate 23 on both front and rear sides.
24 is the installation. Between the left ejector plate 24 and the core back plate 21 is an ejector that is moved to the movable side by the ejector rod as described above when the molded product is taken out from the movable bushing plate 62. Pin holding plate 70
More specifically, an ejector guide mechanism 25.25 is provided for smoothly guiding the movement of the right ejector plate 23 attached to the right ejector plate 23 using bolts 230. An extractor return mechanism 26, 26 is provided to push back the pin holding plate 70.

The ejector guide mechanism 25.25 consists of a guide pin 25a as shown in FIG. 1 and a bush 25b that slidably guides the guide pin 25a. In addition, the ejector return mechanism 26
consists of a pin 26a and a return spring 26b attached to the pin 26a. The return spring 26b is in a compressed state when the molded product is taken out from the movable bushing plate 62, and when the ejector rod is retracted to the right from this state, the return spring 26b is expanded, and the biasing force at that time causes the right ejector to move. The plate 23, ie, the ejector pin holding plate 70, is pushed back to the right side.

Now, the ejector pin holding plate 70 is shown in FIG. 7(a).
, as shown in (b), the ejector guide mechanism 25
After the ejector return mechanism 26 and ejector return mechanism 26 are inserted from above between the front and rear left ejector plates 24 and 24, they can be attached to the right ejector plate 23 using bolts 230 and 230. By loosening the ejector pin holding plate 70, the ejector pin 71 held therein can be replaced. Therefore, with the die set 10 attached to the injection molding machine, injection molding of various molded products determined by the ejector pin 71 can be performed by simply replacing the ejector pin presser plate 70. Incidentally, in the conventional example described above, the ejector pin holding plate 70 and the left ejector plate 24 were integrated, so such replacement work could not be performed.

Next, the structure around the movable bushing plate 62 will be explained. The movable bushing plate 62 is installed by pushing it into the core back plate 21 from the left side as shown in FIGS. 8(a) and 8(b). In this case, as described above, stepped portions 21a, 21 are formed at the connecting portions between the movable bushing plate retainers 22a, 22b and the core back plate 21.
a is formed, so the movable side bushing plate 6
2 positioning is performed with high precision.

In addition, a counterbore hole 220 is provided at a predetermined position of the movable bushing plate retainer 22b, and the movable bushing plate 62 is connected to the core bank plate 21 by a bolt 221 and a collar 221a that are fastened from the fixed side. And the movable bushing plate can be reliably attached to the presser main body 22. That is, when the bolt 221 is tightened as shown in FIG.
The end portion a presses the stepped portion 62b provided on the corresponding portion of the movable bushing plate 62 against the core bank plate 21 side, so that the movable bushing plate 62 is attached.

However, if such attachment is due to the structure, when the mold is opened between the stationary side bushing plate 61 and the movable side die set 18 as described above, the bolts 221 can be loosened, so the die set 10 can be injection molded. The movable bushing plate 62 can be replaced while it is attached to the machine.

Furthermore, an inclined surface 63 similar to that of the fixed bushing plate 61 is formed on the front side surface of the movable bushing plate 62, and the rod 81 of the mechanical component B can be positioned and tightened on this inclined surface 63 in the same manner as described above. By abutting against each other, the positioning and attachment of the movable bushing plate 62 to the connection body of the movable bushing plate retainer body 22 and the core back plate 21 can be performed more accurately.
And it can be done reliably. 82 is a special bolt similar to that described above, and a similar tapped hole 38 is provided in the front movable bushing plate retainer 22a.

In addition, 36 and 39 in the figure are cooling fluid supply holes for supplying cooling water, cooling oil, etc. into the cavity block 68, and the cooling fluid is supplied into the cavity block 68 through a hose (not shown) connected to this hole. The circulating cooling fluid cools the cavity block 68, thereby controlling its temperature.

<Effects of the Invention> In the case of the above-described injection molding mold of the present invention, when the main parts of the mold, such as the sprue unit, the bushing plate unit, and the ejector turbine presser plate, are attached to the die set on the injection molding machine, Since they are each removable, there is an advantage that they can be replaced quickly.

In addition, various injection molded products can be manufactured by simply replacing necessary parts such as the bushing plate unit that houses the cavity block, without having to manufacture the entire mold, which helps with the trend toward high-mix, low-volume production. This means that it can easily handle the production of modern injection molded products.

Furthermore, there is also the advantage that the overall time required for manufacturing the mold can be shortened and the manufacturing cost can be significantly reduced.

[Brief explanation of the drawing]

1 to 9 are drawings according to the present invention, in which the first
The figure is a cross-sectional plan view showing the overall structure of the injection mold according to the present invention, and FIG. 2 is a cross-sectional view showing the mold of the present invention cut at the position indicated by line A-A in FIG. 3(b). Figure, Figure 3(a)
Figure 3 is an exploded perspective view showing the main parts of the stationary die set.
b) is an exploded perspective view showing the main parts of the movable side grip set, No. 4
Figure (a) is an exploded perspective view showing the main parts of the sprue unit, Figure 4 (b) is an exploded perspective view showing the main parts of the sprue unit for two plates, and Figure 5 is the main parts of the bushing plate unit. Exploded perspective view showing FIGS. 6(a) and (b)
7(a) and 7(b) are perspective views showing the state before and after the sprue unit is attached to the fixed side fixing plate and stripper plate, respectively. Figures 7(a) and (b) show the fixed side bushing plate being attached to the fixed side bushing plate holder. A perspective view showing the previous state and the installed state, FIG. 8(a),
(b) is a perspective view showing the state before and after the movable bushing plate and ejector turbine holding plate are attached to the movable side grip set, respectively; Figs. 9(a) and (b)
) is a perspective view showing the external structure of a movable die set and a fixed die set, respectively. 10... Die set 11... Fixed side die set 13... Fixed side fixed plate 14... Stripper plate 17... Connection member 18... Movable side die set 19... Movable side fixed plate 23... Right ejector plate 24... Left ejector plate 30.32.161.221.230... Bolt 30a 32a 161a... Collar 50...
Sprue part unit 51... Swab month - presser plate 52... Stripper bushing plate 53... Sprue bush 60... Bushing plate part unit 61... Fixed side bushing plate 62... Movable side bushing plate 68... Cavity block 70... Ejector pin holding plate 71... Ejector pin patent applicant Sharp Corporation patent applicant Sharp Seiki Co., Ltd. agent Patent attorney Takaharu Ohnishi Figure 4 Figure 5 (a) 6th 7th Figure 1a (b)

Claims (2)

[Claims] (1) A sprue comprising a fixed side fixing plate attached to the fixed side of the injection molding machine, a movable side fixing plate attached to the movable side of the injection molding machine, a sprue bush, and a sprue bush holding member that holds the sprue bush. a bushing plate unit including a fixed bushing plate and a movable bushing plate, a fixed holding member that holds the fixed bushing plate, and a movable holding member that holds the movable bushing plate; An ejector pin holding plate that holds an ejector pin and an ejector plate that holds the ejector pin holding plate are provided, and the sprue unit and the fixed side bushing plate are connected to the fixed side fixed plate and the fixed side bushing plate by fastening members respectively fastened from the movable side. For injection molding, the movable bushing plate and the ejector pin press plate are respectively attached to the movable side holding member and the ejector plate by fastening members that are respectively attached to the fixed side holding member and fastened from the fixed side. Mold. (2) The injection mold according to claim 1, wherein the sprue bush holding member is separable into a sprue bush holding plate and a stripper bushing plate.