JPH0818351B2 - Injection mold - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die. More specifically, the present invention relates to an injection mold of a type capable of manufacturing a mold body capable of manufacturing boxes having different shapes and dimensions by using the same component or a set of component parts of the mold.

[0002]

2. Description of the Related Art Generally, the production of plastic injection-molded products by a mold is suitable for mass-produced products. In fact, each product requires its own mold, and such a mold is expensive. , It will be profitable only after mass production of products. Also, for example, a specific product such as a box can be produced at a low cost by injection molding, but in order to do so, not only a different mold is manufactured for each shape of the box, but also each size, length, and Molds must be manufactured according to width and depth.

[0003]

As a result, each mold is used for low volume production of uniquely sized boxes, and the number of different molds is also very large. SUMMARY OF THE INVENTION In order to avoid such complication, the present invention is a mold main body capable of manufacturing boxes having different shapes and dimensions using the same parts or a mold for injection molding of a type capable of manufacturing a set of mold component parts. Intended to provide a type.

[0004]

SUMMARY OF THE INVENTION According to the present invention, the above object is an injection mold comprising two assemblies slidable relative to each one, each assembly on the one hand being a male mold part. On the other hand, has a plate for supporting the female mold part, the male mold part being firmly and detachably fixed to the plate of the male mold assembly, and positioned around the core. In addition, it has edging parts that are removably fixed to the plate, and these edging parts define the shape of the edging of the product to be injection-molded, and the female mold part mutually connects the modular parts The solution is an injection mold which is formed from the laminate positioned at the same time and is removably attached to the plate of the male mold assembly.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a mold as defined in claim 1 for manufacturing a box by injection molding. The attached figures show the mold shape of the mold according to the present invention and this. FIG. 11 shows an outline of a box manufactured using a mold. This mold, like all injection molds, consists of a male mold and a female mold, one of which can be moved relative to the other to open and close the mold.

The male mold has a frame consisting of a stiffener 3 and two parallel plates 1, 2 which are interlocked by any suitable means. Also, this male mold has at least 2
There are two boring holes 4 in which female mold guide pins 5 can be stored while sliding. The so-called male mold part is supported by the free surface of the parallel plate 1 which constitutes one part of the male mold and consists of a core 6, usually of aluminum, which is fixed to the plate 1 by means of stud bolts.
In order to maintain the core temperature at the set temperature on the plate 1,
Usually, there is a pipe through which a cooling fluid circulates.

In the alternative of the male mold, a steel rod is inserted into the boring holes provided in the plate 1 and the core 6 to smoothly discharge and transfer heat from the core 6 to the parallel plate 1 to be cooled. Secure. The shape of the core 6 such as width, length and height is
Match the internal shape of the box or product before molding. Also in the male mold part is a series of edging parts 7 which surround the core 6 base and are firmly fixed to the plate 1 with bolts.

FIG. 10 is a schematic plan view of a core 6 surrounded by edging parts 7 having different shapes and dimensions and having different shapes. By arranging the series of edging parts 7 in parallel, different shapes can be obtained. Therefore, the corner edging parts 7a, 7b,
7c, linear edging components 7d and 7e, and special corner edging component 7f and special linear edging component 7g that can incorporate a space for storing hinges in the edging of the molded box.

A double groove 8 for forming an edge of a molding box or an injection box is provided on the upper surface of the edging component 7 (FIGS. 2 to 4), and the edging component can be fixed to the plate 1. There is a threaded hole. FIG. 3 shows a top view of a special part 7 in which the groove 8 is offset, which part has means for providing a groove in the edge of the injection box for the purpose of receiving a hinge.

Therefore, the male mold part is assembled and manufactured according to the shape of the box or product to be injection-molded based on the core 6 and the series of edging parts 7. Of course, these standardized modular parts, which are side-by-side and compatible, and allow for edging of injection-molded products, are machined with a precision of a few microns, and the seams between these parts are barely visible in injection-molded parts. Try not to.

The female mold part is attached to an assembly which is movable with respect to the male mold part with a plate 8 interlocking with the guide pins 5. The plate 8 is also equipped with a cooling pipe. A base plate 9 having a screw hole 10 is fixed to the plate 8, and the stacked modular parts 11 to 18 constituting the female mold portion can be fixed by the screw hole using a bolt or a stud. Each of the modular parts 11 to 18 constitutes a part of a parts set that can realize the same shape as that shown in FIG. Each of these parts sets includes large and small corner parts and large and small straight parts. Since the sets of modular parts 11 to 18 differ only in width, when the modular parts are stacked with their vertical edges aligned as shown in FIG. 1, a needle shape of a mold can be formed on the opposite side.

The modular part also has a bored hole (FIGS. 8 and 9) so that the pin 18 allows for perfect centering. Thus, this female mold part stacked on the base plate 9 has a bottom part 19 and modular parts 11-18. The penetrating pin 23 ensures a perfect centering of this modular part. The bolt 20 for embedding the head portion in the modular component 14 includes the modular components 11 to 11.
Secure 14 to the base plate. The bolts 21 secure the modular parts 15, 16, 17, 18 to the modular part 14.

If the depth of the product to be injection molded becomes smaller,
Obviously, the number of modular parts to be stacked is also reduced. Therefore, similar to the male mold part, prefabricated modular parts are assembled side by side to form a female mold part. With this modular component, it is possible to obtain a female mold part having a desired shape.

This female mold part is also provided with an injection nozzle 22 connected to the plate 8 so that when the upper and lower molds are supported with each other in a closed state (FIG. 1), the core 6 and the edging component 7 are provided. / Plastic material can be injected into the space between the modular parts 11-18. The advantage of this main mold is that it uses prefabricated standard parts to make molds of different shapes. Therefore, injection molds are profitable even for relatively small amounts of injection molded products.

The modular parts 11 to 18, the edging part 7 and the core 6 of the female mold part can be easily assembled, and can be performed accurately and quickly in order to minimize wasteful time. Obviously, the shapes of the core 6, the edging part 7 and the modular parts 11 to 18 of the female mold part can be changed in the same manner as the assembling, the direction / positioning and the fixing. What is important here is that molds having different shapes and dimensions can be manufactured by simply performing accurate and quick assembling based on a pre-manufactured part set.

FIG. 11 shows a box or packaging, the two parts of which are obtained by injection molding using a mold as described above. The box has a bottom portion 31 and a cover portion 32 which have the same shape and size. In the example shown, the bottom 31 and the cover 32 are generally rectangular in shape and equipped with an edge 33 with a groove 34. In this configuration, there are lateral slits 35 on the short sides of the cover portion and the bottom portion, respectively, in which the connecting parts for fixing the cover portion 32 and the bottom portion 31 together are housed. The opening surfaces of the bottom portion 31 and the cover portion 32 are surrounded by an edge 33, and a plastic packing 36 is attached to a groove 34 of the edge 33.

The bottom 31 and cover 32 are made of injection molded plastic and can have the same or different depths as shown. On the other hand, the shape and size of this opening, and thus the shape and size of the edge 33, are always the same,
Make sure that the packaging is in the closed position and exactly overlaps.

Pressing the cover portion 32 against the bottom portion 31 to maintain the packaging in the closed position can be accomplished by connecting means or other suitable means. However, in the example shown, the packaging is kept in the closed position by a very practical and original method using a connecting piece which can be clipped on by the slit 35 of the rim 33.

Each connecting piece made of plastic has two flexible components 38, 39, which are separate production parts and constitute a hinged sheet 40.
Are integrally connected by. Each component 38, 3
9 has a shape, size, and fulcrum that can be locked in the slit 35 of the edge 33 by the ratchet mechanism.

FIG. 13 shows how the two parts of the packaging 31, 32 are fixed together by means of connecting parts. In order to open the packaging, it is sufficient to apply a force in the direction of arrow A to the tip of the component part 38 of the connecting part, so that the connecting part can be detached from the cover part 32 through the slit 35. .

The cover part 31 can be brought to the open position shown in FIG. 11 around the hinge of the other connecting part connecting the remaining two short sides of the packaging. The component parts 38, 39 of the connecting piece have a ratchet mechanism which consists of two interlocking projections, which can be kept in the closed position. The same applies to the open position of the packaging.

This connecting part can be obtained at low cost by injection molding of a plastic material, and the two parts (bottom part and cover part) of the packaging can be fixed quickly and practically.
Since the connecting parts 38, 39 are symmetrical, either the cover 32 of the packaging or the edge 33 of the bottom 31 can be accommodated.

Packaging cover 32 and bottom 3
Obviously, a plurality of slits 35 can be provided on the same side of the edge 33 based on the shape and size of 1. This kind of slit 35 can be provided on the four sides of the two-part split of the packaging and the box can be tightly closed using connecting parts.

[0024]

Since the injection molding die according to the present invention is constructed as described above, the die having different shapes and dimensions can be assembled accurately and quickly by appropriately selecting it from the pre-made parts set. Therefore, it is possible to promptly provide a mold of a container adapted to various dimensions. Since the die cost can be reduced in the total number of parts to be produced, it is possible to reduce the cost of production parts.

[Brief description of drawings]

FIG. 1 is a schematic cross section of a mold half according to the invention.

FIG. 2 is an elevational view of the components that make up the male die section.

FIG. 3 is a plan view of a component forming a male mold part.

FIG. 4 is a plan view of a component forming a male mold part.

FIG. 5 is a front view in which components that form the female die portion are stacked.

FIG. 6 is a cross-sectional view of components that form a female mold part.

FIG. 7 is a plan view of components that form a female die section.

FIG. 8 is a cross-sectional view of components that form a female mold part.

FIG. 9 is a plan view of components that form a female die section.

FIG. 10 is a plan view showing various constituent shapes of a male mold part obtained by assembling the constituent parts of the mold.

FIG. 11 is a perspective view of a box in an open state manufactured from a two-piece product (the bottom part and the cover part of the box) obtained by using the mold according to the present invention.

[Explanation of symbols]

 1 parallel plate (male mold) 2 parallel plate (male mold) 3 guide pin 4 boring hole 5 guide pin 7 edging component 6 core 8 plate 9 base plate 10 screw hole 11-18 modular component 20 bolt 21 bolt 22 injection Nozzle 23 Penetration pin

Claims (9)

[Claims] 1. Two slideable on each side
An injection molding die comprising one assembly, each assembly having a plate supporting a male die part on the one hand and a female die part on the other hand, wherein the male die part is a male die part It has a core that is firmly and removably fixed to the plate of the assembly, and an edging component that is positioned around the core and that is removably fixed to the plate. It defines the shape of the rim, and the female mold part is detachably attached to the plate of the male mold assembly while the modular parts are formed from a stack of mutually positioned modular parts. A mold for injection molding, which is characterized in that 2. The modular parts forming the female mold, the core forming the male mold, and the edging part are selected from pre-made standardized parts according to the size of the molded article. The mold for injection molding according to claim 1. 3. Injection molding according to claim 1 or 2, characterized in that the steel rods penetrate the parallel plates of the male mold assembly on the one hand and the core on the other hand, from which heat is dissipated. Mold. 4. The mold for injection molding according to claim 1, wherein the core and the edging part are bolted to the parallel plates of the male mold assembly. 5. The modular parts are positioned with respect to the plate of the female mold assembly with pins extending through the respective modular parts.
The mold for injection molding according to. 6. The mold for injection molding according to claim 5, wherein the modular parts are stacked and fixed to the plate of the female mold assembly with bolts. 7. Bolts are bolted through all or only part of the stacked modular parts and respectively with or by a base plate interlocking with the plates of the female mold assembly. The mold for injection molding according to claim 6, which is characterized. 8. The mold for injection molding according to claim 1, wherein the mold has a corner edging component and a linear edging component, and a corner modular component and a linear modular component. 9. The injection mold according to claim 1, wherein the specific edging component has a mechanism suitable for providing a lateral slit in a product to be injection molded.