JPH02279311A - Mold and its manufacture - Google Patents

Abstract

PURPOSE:To increase durability of a molded surface and realize its high accuracy by providing a molded surface constituting component constituted of an iron plate layer, a lining resin body bonded on the rear surface of said component and a heat transfer fluid flowing pipe. CONSTITUTION:A molded surface constituting component 44 with a molded surface 16 corresponding to the shape of a desired molded product is constituted of an iron plated layer of given thickness formed by the plating method, and a lining resin body 20, which is block-shaped synthetic resin body, is bonded integrally on the rear surface of the non-molded surface side of said layer through a bonding agent layer 18. A plurality of metal hollow pipes 22 are welded and fixed at one end of the rear surface of a molded surface constituting component 14 disposed in the state of running through the lining resin body 20 in the wall thickness direction, and a heat transfer fluid flowing pipe 24 for passing the given heat transfer fluid such as cooling water is disposed in the state of being buried integrally in the given disposed shape in the lining body 20. Durability of the molded surface can be increased and high molded surface accuracy can be attained easily by said arrangement.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention provides a method for manufacturing a device that is relatively easy to manufacture and has relatively excellent durability.
The present invention relates to a mold suitable for use as a mold for medium-volume products and a method for manufacturing the same.

(Background technology) Regarding molds used for injection molding, blow molding, vacuum forming, etc., ZAS type (zinc alloy type), which is a simple mold, is often used when the mold is for small to medium volume production. There is. However, since the material of the ZAS type is soft and the durability of the molding surface is poor, the production quantity of molded products is extremely limited, and it cannot be used for medium-volume products whose production quantity exceeds a certain level (for example, about 5,000 pieces or more). As a mold for this purpose, it could hardly be said to be desirable. In addition, because the material is soft, the protrusions tend to collapse, making it difficult to use for molding products with detailed shapes.Furthermore, the shrinkage rate during manufacturing is high, resulting in poor molding surface accuracy. There were also problems.

In addition, as one of the simple molds, in recent years, JP-A-55-1
In Japanese Patent No. 5886, a mold with a structure in which a backing resin body is integrally bonded to the back side of a metal film formed by a thermal spraying method is proposed. The durability of the molding surface is not necessarily good because the molding surface is composed of
There was a problem in that the mechanical strength of the mold could not be improved by welding reinforcing metal fittings to the back side of the sprayed metal coating, and furthermore, there was a problem in that texturing (corrosion processing) could not be performed.

On the other hand, in contrast to the above-mentioned simple molds, molds for mass-produced products obtained by copying forged steel are used as molds with excellent performance such as molding surface accuracy, durability, and mechanical strength. Molding molds are known.

However, such molds take a lot of time and effort to manufacture, and the manufacturing period and manufacturing cost are extremely long and high. There was a problem that it was not worth the cost.

(Problem to be solved) The present invention has been made in view of the above circumstances, and the problem to be solved is that the Z A, S type and the sprayed metal coating are Compared to conventional simple molds, the molding surface is harder and more durable, and it is possible to mold fine shapes with high precision, and it is possible to weld and texture. Moreover, compared to molds for mass-produced products obtained by processing forged steel, it can be manufactured in a short period of time and at low cost.
It is an object of the present invention to provide a structure of a mold suitable for use as a mold for medium-volume products and a method for manufacturing the same.

(Solution Means) In order to solve this problem, the present invention provides (a) a forming surface constituent member comprising an iron plating layer of a predetermined thickness, and (b) a non-forming member of the forming surface constituent member. On the back side of the side,
A mold is formed so as to include a lining resin body integrally joined to the molding surface constituting member, and (c) a heating medium fluid distribution pipe integrally embedded in the lining resin body. It was decided to compose the system.

In addition, when manufacturing such a molding die, (a) producing a model mold having an inverted shaped surface of the molding surface corresponding to the desired molded product shape; (C) forming a conductive layer and forming an iron plating layer of a predetermined thickness on the inverted shape surface of the model mold; A frame body is provided to surround the back surface, and a heat medium fluid distribution pipe is arranged in the space surrounded by the frame body, and a predetermined resin material is injected into the frame body and solidified to form the iron plating layer. This includes the step of integrally bonding and providing a lining resin body on the back side.

In addition, when disposing an ejector pin for releasing the molded product from the molding surface in the above-mentioned mold, one end is welded and fixed to the back surface of the molding surface component, and the backing resin is fixed to the back surface of the molding surface component. A hollow pipe is provided so as to penetrate through the body, and a portion corresponding to the hollow pipe of the molding surface component is cut out, so that the ejector pin can be made to protrude toward the molding surface side of the molding surface component through the space within the hollow pipe. It is desirable to do so.

In addition, when manufacturing a mold equipped with such a hollow pipe for ejector pin protrusion according to the method of the present invention as described above, the hollow pipe is placed on the back side of the iron plating layer prior to molding the lining resin body. One end of the hollow pipe is fixed by welding, and a lining resin body is molded so that the other end of the hollow pipe is exposed. After the lining resin body is molded, the portion corresponding to the hollow pipe of the iron plating layer is cut out. It is desirable to do so.

(Example) Hereinafter, in order to clarify the present invention more specifically,
The embodiment will be described in detail based on the drawings.

First, FIG. 1 shows a cavity mold 10 as an example of an injection mold according to the present invention, and FIG. 2 shows a cavity mold 10 forming a predetermined cavity with the cavity mold 10 of FIG.
A core mold 12 is shown as an example of the invention. 1st
In the illustrated cavity mold 10, 14 is a molding surface component having a molding surface 16 corresponding to the shape of a desired molded product, and is made of an iron plating layer of a predetermined thickness formed by a plating method. A backing resin body 20, which is a block-shaped synthetic resin body, is integrally bonded to the back surface of the non-molded surface side through an adhesive layer 18. Then, the lining resin body 20 is placed in the thickness direction (first
The molding surface constituting member 14
A plurality of metal hollow pipes 22 are disposed with one end welded and fixed to the back surface of the lining resin body 20.
A heat medium fluid distribution pipe 24 through which a predetermined heat medium fluid such as cooling water flows is disposed integrally embedded therein in a predetermined arrangement form.

On the other hand, in the core mold 12 shown in FIG. 2, 26 is a molding surface forming member that forms a cavity 28 corresponding to the desired molded product shape with the molding surface forming member 14 of the cavity mold 10. Molding surface component 14 of mold 10
Similarly, it is composed of an iron plating layer of a predetermined thickness.

In this core mold 12 as well, the lining resin body 2 of the cavity mold 10 is
A block-shaped lining resin body 32 similar to that shown in FIG. , are provided in the same form as the hollow pipe 22 and heat medium fluid distribution pipe 24 in the cavity mold 10.

In this core mold 12, unlike the cavity mold 10, a portion of the molding surface constituting member 260 corresponding to the inner space of the hollow pipe 22 is cut out. An ejector pin (not shown) for releasing the molded product can be projected toward the molding surface 38 through the inner space of the hollow pipe 22.

The cavity mold 10 and the core mold 12 are each used by being removably attached in a cassette manner to a recess provided in a mold base serving as a mold body.

Although not shown here, the cavity mold 10 also has a cavity 28 in the same form as the hollow pipe 22.
A sprue pipe for guiding the molding material into the molding material will be provided as necessary.

However, when such a sprue pipe is provided, the portion of the molding surface component 14 corresponding to the sprue pipe is cut out, similar to the portion of the molding surface component 26 corresponding to the hollow pipe 34 in the core mold 12. It happens.

Furthermore, as the lining resin body 20.32 of the cavity mold 10 and the core mold 12,
In order to improve the heat transfer performance of the core mold 12 and shorten the molding cycle, and also to increase the mechanical strength of the backing resin 20.32, metal powder such as copper or aluminum is usually used. An epoxy resin or the like mixed with a predetermined proportion of metal fibers made of a metal material will be used.

Next, the manufacturing procedure of the cavity mold 10 and core mold 12 will be explained in detail based on the drawings.

That is, the cavity mold 10 and the core mold 1 as described above
2, first, using an easily processable material such as wood or graphite, a molding surface 40 having a shape that is an inversion of the molding surface 16 of the intended cavity mold 10 as shown in FIG. 3 is prepared. A prototype 42 is produced. Here, prototype 4
The molding surface 40 of No. 2 is formed so as to precisely match the molding surface 16 of the intended cavity mold 10, that is, the desired shape of the molded product. Then, in order to produce the core mold 12,
Using this master mold 42, first, a first disposable model 44 is made of plaster or the like, as shown in FIG. 4, to which the shape of the molding surface of the master mold 42 is transferred.

Once the first disposable model 44 has been produced, a build-up operation corresponding to the cavity 28 is performed on the molding surface 46 of the disposable model 44. For example, as shown in FIG. 4, a sheet corresponding to the cavity 28 is attached to the molding surface 46.

Next, using the first disposable model 44 whose molded surface 46 has been built up by pasting a sheet 48 or the like, a shape in which the built-up molded surface of the first disposable model 44 is transferred as shown in FIG. A second disposable model 52 having a molding surface 50 is made of plaster or the like. Then, using the second disposable model 52, a plating model 54 as shown in FIG. 6, which has the molded surface 50 of the second disposable model 52 transferred thereon, is made of plaster or the like.

As is clear from the above description, the molding surface 50 of the second disposable model 52 has the same shape as the molding surface of the target core mold 12, and therefore, the second disposable model 52
A plating model 54 created by transferring the molding surface 50 of
The molding surface 56 becomes an inverted shape surface of the molding surface 38 of the core mold 12 for the purpose.

In this way, once the plating model 54 having the molding surface 56 that is an inverted shape of the molding surface 38 of the core mold 12 is produced, if the constituent material of the plating model 54 has conductivity, it can be used as is. If the model 54 is not conductive, a conductive film 58 made of conductive resin or the like is formed on the molding surface 56 as shown in FIG. 7, and then the model 54 for plating is placed in a plating bath. The molding surface 56 of the plating model 54 is immersed in iron plating to deposit and form an iron plating layer (26) of a predetermined thickness.

In other words, by this iron plating operation, the molding surface constituting member 26 of the core mold 12 having the molding surface 38 corresponding to the desired molded product shape is produced.

The thickness of this iron plating layer (molding surface component 26) will be appropriately selected depending on the performance required of the core mold 12, but in general, it is 5 to 10 depending on the mechanical properties required for
The thickness will be set to about mm.

Furthermore, as is clear from the above description, the plating model 54 here serves as a model mold having an inverted shaped surface (56).

When the thickness of the molding surface component (iron plating layer) 26 reaches the desired thickness, the plating model 54 is pulled out of the plating bath, and after performing predetermined processing such as cleaning, the molding surface component 26 is peeled off from the plating model 54, and a suitable number of metal hollow pipes 34 are welded and fixed at one end of each to the back surface thereof, as shown in FIG. After welding and fixing the hollow pipes 34, welding of the hollow pipes 34 is performed to correct the unevenness caused on the molding surface of the molding surface component 26 on the third day, and the peripheral edge of the molding surface component 26 is adjusted to a predetermined position. Perform standard machining such as edging to create the desired shape.

Once this reference machining is completed, next, a copper wire or the like is used on the back side of the molding surface component 26 that has been subjected to the reference machining to obtain the desired shape, for example, to keep the mold temperature constant. The heat transfer fluid distribution pipe 36 is fixedly arranged in this form. Thereafter, as shown in FIG. 8, a wooden frame or the like is placed so as to surround the space on the back side of the molding surface component 26 at a predetermined height and accommodate the heat transfer fluid distribution pipe 36 inside. A frame body 60 is provided, and after the frame body 60 is arranged,
Adhesive (30) is applied to the back surface of the molding surface component 26 to a predetermined thickness, and the frame is attached so that the free end of the hollow pipe 34 is exposed under the applied adhesive (30). A predetermined synthetic resin is injected into 60 and solidified to form the lining resin body 32.

After molding this lining resin body 32, the hollow pipe 3
A portion of the molding surface constituting member 26 corresponding to the inner space of No. 4 is cut out, and the frame body 60 is removed. As a result, a core type I2 having a structure as shown in FIG. 2 is obtained.

Further, the cavity mold 10 will be manufactured using the master mold 42 in the following manner.

That is, in order to manufacture the cavity mold 10, as shown in FIG. 9, the molding surface 40 of the master mold 42 is
A predetermined conductive film 62 is formed from a conductive resin or the like, and the conductive film 62 is
Iron plating is applied to the surface of the molding surface 40 of the master mold 42 in which the molding surface 40 is formed to form a molding surface constituting member (iron plating layer) 14 having a desired thickness. Then, the molding surface constituent member 14 is attached to the master mold 42.
After the hollow pipe 22 is welded and fixed to the back surface of the hollow pipe 22, the molding surface component 14 is subjected to the same standard machining as the base fjjg machining performed on the molding surface component 26.
Thereafter, as shown in FIG. 10, a heat transfer fluid distribution pipe 24 and a frame body 64 such as a wooden frame are arranged in the same manner as in the case of manufacturing the core mold 12. Then, an adhesive (18) is applied to the back surface of the molding surface forming member 14, and a predetermined resin is injected into the space inside the frame 64 under the applied state of the adhesive (1 day) and allowed to harden. A backing resin body 2o is integrally bonded to the back surface of the molding surface forming member 14. After molding this lining resin body 20, the frame body 64
By removing the cavity mold 1 with the structure shown in Fig.
0 is obtained.

In addition, also in this cavity mold 10, the thickness of the molding surface forming member I4 will normally be set to about 5 to 10 m1I+.

Further, when a sprue pipe is provided to the cavity mold 10 manufactured in this way, when the hollow pipe 22 is welded and fixed to the molding surface component 14, the sprue pipe is attached to the back surface of the molding surface component 14. The sprue pipe may be welded and fixed at the same time, and after the lining resin body 20 is molded, the portion of the molding surface constituting member 14 corresponding to the sprue pipe may be cut out.

Furthermore, as is clear from the above description, when manufacturing the cavity mold 10, the master mold 42 has an inverted shape surface (
40).

By the way, the cavity mold 10 and the core mold 12 manufactured as described above have the cavity 2 as described above.
The molding surface constituting members 14 and 26 that define the molding surface 8 are each composed of an iron plating layer made of pure iron. Therefore, the molding surface 16.38 becomes significantly harder than the ZAS type or conventional simple molds that use a vapor-deposited metal film as a molding surface component, and the durability of the molding surface 1.6.38 is greatly improved. It happens. Therefore, compared to those conventional simple molds, the molding surface 1.6.38 can withstand the production of more (5,000 to tens of thousands of pieces) for medium-volume products. When used as a mold, the manufacturing cost of the mold per molded product can be reduced compared to when using a conventional simple mold.

In addition, since the molding surface 16.38 is composed of a hard iron plating layer, even if a protrusion is provided, the protrusion will not fall easily, allowing for a finer product shape than with conventional simple molds. Furthermore, there is an advantage that the molding surface 16.38 can be textured. Furthermore, since the molding surface components 14 and 26 are constructed using a plating method, the shrinkage rate in the manufacturing process of the molding surface components 14 and 26 is extremely small, and the prototype 42 can be manufactured without considering the shrinkage rate. It has the advantage that the prototype 42 is extremely easy to manufacture, and has the advantage that the molding surface accuracy can be greatly improved compared to the ZAS mold. Since the hollow pipe 2234 is accommodated on the back side, compared to the simple mold disclosed in JP-A-55-15886,
Another advantage is that the mechanical strength of the cavity mold 10 and the core mold 12 is significantly superior.

Then, the cavity mold 10 manufactured as described above
According to the core mold 12, the time and cost required for its manufacture can be significantly reduced compared to molds for mass-produced products obtained by copying forged steel. Compared to the case where conventional molds for mass-produced products are used as molds for medium-volume products of tens of thousands of units, it is possible to significantly shorten the delivery time of molds, and it is possible to This makes it possible to significantly reduce the manufacturing cost of the molds required for each hit.

Although the embodiments of the present invention have been described in detail above, these are literal illustrations, and the present invention is not limited to such specific examples, and various changes, modifications, and changes may be made without departing from the spirit thereof. It goes without saying that the present invention can be implemented in a modified form.

For example, in the above embodiment, in both the cavity mold 10 and the core mold 12, the molding surface constituent members 1.4.26
Hollow pipes 22, 34 were welded and fixed to the back side of the mold 10, 12 to mechanically reinforce the mold 10, 12, but instead of these hollow pipes 22, 34, solid rod-shaped fittings or other metal fittings were used. It is also possible to weld and fix reinforcing metal fittings of arbitrary shapes to reinforce the molds 10 and 12.

However, in the core mold 12, if the guide hole for the ejector pin is formed directly in the lining resin body 32, the lining resin body 32 will be worn out by the sliding contact of the ejector pin. It is desirable to use it as a reinforcing metal fitting and also as a guide for the ejector pin.

Further, in the embodiment described above, during the manufacture of the core mold 12, the drilling of holes in the portion of the molding surface forming member 26 corresponding to the hollow pipe 34 is performed after the lining resin body 32 is molded. However, it is also possible to perform such drilling after welding the hollow pipe 34 to the molding surface component 26 and before molding the lining resin body 32, and furthermore, before welding the hollow pipe 34. It is also possible to do so. However, as in the above embodiment,
The steps to be performed after molding the lining resin body 32 are as follows:
Higher drilling with easier machining is desirable for accuracy. Incidentally, this situation can be similarly applied to the case where a sprue pipe is welded and fixed to the molding surface forming member 14 of the cavity mold 10.

Furthermore, in the above embodiment, the cavity mold 10 and the core mold 12 are both used with the frames 64 and 60 removed, but depending on the material of the frames 64 and 60, It is also possible to use the cavity mold 10 and core mold 12 while the bodies 64, 60 remain integral with the backing resin body 32, 20.

Further, in the above embodiment, the present invention was applied to the cavity mold 0 and the core mold 12 as injection molding molds, but the present invention can also be applied to blow molding molds, vacuum molding molds, etc.
Of course, the present invention can also be applied to molds other than injection molds.

(Effects of the Invention) As is clear from the above description, in the mold according to the present invention, the molding surface is composed of an iron plating layer that has high hardness, can be welded, and has a small shrinkage rate during manufacturing. Therefore, compared to the Z A, S type and conventional simple molds that use thermal sprayed metal coating as the molding surface component, it has the advantage that the molding surface can withstand the molding of more products, and it also allows for finer product shapes. In addition to the advantages of being able to easily obtain higher molding surface accuracy, it also has the advantage of being able to be textured, and it also has the advantage of being able to be used as an iron plating layer as a component of the molding surface. Another advantage is that the mechanical strength can be greatly improved by welding reinforcing metal fittings to the back side. Moreover, compared to molds for mass-produced products obtained by processing forged steel, the manufacturing period and manufacturing costs can be significantly shorter and cheaper, so when adopted as molds for medium-volume products, It also has the advantage that the manufacturing cost of a mold per molded product can be significantly reduced compared to molds for mass-produced products obtained by processing forged steel.

According to the method of the present invention, a mold that exhibits such effects can be advantageously manufactured.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a cavity mold as an example of the mold according to the present invention, and FIG. 2 is a cross-sectional view showing a core mold as an example of the mold according to the present invention. 3 to 8 are explanatory cross-sectional views for explaining the manufacturing process of the core mold shown in FIG. 2, respectively, and FIGS. It is an explanatory sectional view for explaining a process. 10: Cavity mold (molding mold) 12: Core mold (molding mold) 14.26: Molding surface constituent member (iron plating layer) 16.38
: Molding surface 20.32: Lining resin body 22.34: Hollow pipe 24.367 Heat medium fluid distribution pipe 2nd: Cavity 40.56: Molding surface (reversed shape surface) 42; Prototype (model mold) 54: For plating Model (model type) 58.62: Conductive film 60.64

Claims (4)

[Claims] (1) A molding surface component made of an iron plating layer of a predetermined thickness, and a backing resin body provided on the back surface of the non-molding surface side of the molding surface component and integrally joined to the molding surface component. and a heating medium fluid distribution pipe integrally embedded in the backing resin body. (2) A hollow pipe is fixed at one end by welding to the back surface of the molding surface component, and is provided so as to pass through the lining resin body, and a portion of the molding surface component corresponding to the hollow pipe is provided. 2. The mold according to claim 1, wherein the mold is cut out so that the ejector pin can be projected toward the molding surface of the molding surface component through a space within the hollow pipe. (3) A step of producing a model mold having an inverted shape surface of the molding surface corresponding to the desired molded product shape, and forming a conductive layer on the inverted shape surface of the model mold, and forming the inverted shape surface of the model mold. a step of forming an iron plating layer of a predetermined thickness on the model mold, and providing a frame body so as to surround the back surface of the non-molding side of the iron plating layer obtained by peeling from the model mold, and surrounding the iron plating layer with the frame body. A step of arranging a heat medium fluid distribution pipe in the space, injecting and solidifying a predetermined resin material into the frame, and integrally bonding and providing a lining resin body on the back side of the iron plating layer, A method for manufacturing a mold, characterized by comprising: (4) Prior to molding the lining resin body, a hollow pipe is welded and fixed at one end to the back surface of the iron plating layer, and the lining resin body is fixed so that the other end of the hollow pipe is exposed. 4. The manufacturing method according to claim 3, further comprising: molding the hollow pipe, and cutting out a portion of the iron plating layer corresponding to the hollow pipe after molding the lining resin body.