JP2007118471A - Molding die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding die which, though a simple structure, saves labor in the demolding work after the molding, gives good yield and ensures safety, and also curbs the total cost. <P>SOLUTION: The molding die is composed of the upper die 2 and the lower die 3, and has, in either of these upper die 2 and lower die 3, the recess 5 from which the molded product 4, formed by these upper die 2 and lower die 3, can not be demolded unless it is deformed. In the center part of the die (referred to as recess containing die) having the recess 5, which is either of the upper die 2 and the lower die 3, there is provided the through-hole 6, and this through-hole 6 is provided with the flanged pin 7 that moves with advance or retreat to the demolding direction and plugs the through-hole 6. When the molded product 4 is demolded from the die, the flanged pin 7 moves along with the molded product 4 to introduce the atmospheric air between the molded product 4 and the recess containing die 3 and to facilitate the demolding. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention provides a mold for rubber molding which is an upper mold and a lower mold. From a molding mold having a recess that cannot be removed unless the molded product is deformed after molding, even when the degree of deformation of the molded product is small The present invention relates to a molding die that can be easily removed from the die.

Conventionally, in a molding die composed of an upper die and a lower die, if there is an undercut part in the molded product by this molding die, unless the mold is divided or the molded product is deformed, The molded product cannot be removed. The former method of dividing the mold cannot be adopted when the divided surfaces of the upper mold and the lower mold cannot be assigned to the surface of the molded product. Such demolding of the molded product is performed by deforming the molded product. Conversely, if the molded product is not deformed, it cannot be molded.

Patent Document 1 discloses the shape of a piston cup formed from a rubber composition. The piston cup shown here is difficult to remove from the mold after molding unless the molded product is deformed as viewed from its cross-sectional shape. As shown in FIG. 10, in order to increase the efficiency of a molding die that deforms and demolds a molded product like this piston cup, individual molds b of a large number of molded products a are formed into sheets. The sheet c integrated with a large number of molded products a is removed by manually turning it.
In addition, there is also known a method in which an ejector pin is provided in each individual mold, and a molded product of each mold is removed by the ejector pin. In that case, a mechanism for operating the ejector pin is required. .

Further, in Patent Document 2, as shown in FIG. 11, by providing dovetail grooves d on the mold opening surface of one mold b of a pair of molds for molding a molded article a made of a rubber-like elastic body, Once,
In a mold that is held by one mold, a mold having a notch e at either corner of the dovetail groove is provided so that the molded product can be easily released from the dovetail portion. Are listed.

JP 2000-7841 A Japanese Patent Laid-Open No. 11-309722

The method of FIG. 10 requires manpower for demolding, and in order to take out each molded product a from the sheet c, a separate punching process for each molded product a is required. It takes. Furthermore, this method has disadvantages such as requiring great care to ensure the safety of the work and tending to reduce the yield.

In addition, the ejector pin method is excellent, but the mechanism is complicated and the initial investment tends to be enormous. At present, when the product life cycle is short, if the initial investment is enormous, the model of the product is often changed before the equipment cost is amortized, and the initial cost may not be absorbed.

Further, according to the mold described in Patent Document 2, not only the shape corresponding to the shape of the dovetail d but also the shape of the notch e connected to the dovetail directly protrudes from the molded product a. It will remain as part f, and this mold cannot be applied to molding of a molded product that requires an accurate undercut shape.

Accordingly, an object of the present invention is to provide a molded product having an undercut that has a simple structure, saves labor, secures a high yield and secures safety, and lowers initial and running costs. It is to provide a molding die.

The present invention has been proposed in order to achieve the above object, and is characterized by having the following configuration.
That is, according to the present invention, the upper mold and the lower mold are configured, and a concave portion that cannot be removed unless the molded product of the upper mold and the lower mold is deformed is provided in either the upper mold or the lower mold. A molding die having one of the upper mold and the lower mold having the recess (hereinafter referred to as “the mold”).
A through-hole is provided in the center of the recess-containing mold), and a pin with a flange that moves forward and backward in the demolding direction and closes the through-hole is provided in the through-hole. The flanged pin moves together with the product, and air is introduced between the molded product and one of the upper mold and the lower mold having the recess. A mold is provided.

Moreover, according to this invention, the said metal mold | die which provided the stopper in the non-flange side of the said pin with a flange is provided.

Moreover, according to this invention, the said metal mold | die with which the elastic spring was mounted | worn between the said stopper of the said pin with a flange, and the said through-hole of the said recessed part containing mold is provided.

Further, according to the present invention, a chamfered portion is provided on the peripheral edge of the flanged pin on the through-hole side so that the flanged pin moves together with the molded product when the molded product is removed. The above-described molding die is provided.

Further, according to the present invention, the flanged pin is provided with an uneven portion on a side portion of the flange, and the flanged pin is moved together with the molded product when the molded product is removed. A mold is provided.

Further, according to the present invention, the molding metal is provided with an uneven portion on a surface portion of the flange of the flanged pin so that the flanged pin moves together with the molded product when the molded product is removed. A mold is provided.

According to the present invention, when the molded product is removed from the recess-containing mold after molding the molded product, the flanged pin moves together with the molded product, so that air enters between the molded product and the recess-containing mold. In addition, the molded product is deformed and removed from the recess and removed from the recess-containing mold, and the flanged pin is removed from the molded product and the molded product can be taken out. The through hole of the mold is closed, and the preparation for the next mold forming is started. Therefore, although the structure is simple, it is possible to save time and labor, and since there is no punching process, it is possible to secure a good yield and safety, and to keep initial and running costs low.

Further, according to the present invention, when the molded product is removed from the recess-containing mold, the flanged pin moves together with the molded product, but when a certain distance is reached, the stopper works and the flanged pin is detached from the molded product. The molded product can be taken out, and the flanged pin closes the through hole of the recess-containing mold. Therefore, in addition to the above effect, there is an effect that the molded product can be reliably taken out by the stopper, and the flanged pin can block the through hole of the concave portion containing mold.

Further, according to the present invention, when the molded product is removed from the recess-containing mold, the flanged pin moves together with the molded product. When a certain distance is reached, the flange is removed from the molded product by the cooperation of the elastic spring and the stopper. The pin comes off and the molded product can be taken out, and the pin with flange closes the through hole of the recess-containing mold by the spring. Therefore, in addition to the above effect, there is an effect that the pin with the flange can reliably block the through hole of the concave portion containing type by the elastic spring.

Further, according to the present invention, the chamfered portion of the flanged pin increases the adhesiveness with the molded product, and when the molded product is removed from the recess-containing mold, the flanged pin moves together with the molded product. Then, air enters between the molded product and the recess-containing mold, and the molded product can be removed from the recess-containing mold. Therefore, in addition to the above effects, there is an effect that the molded product can be surely removed from the recess-containing mold by the chamfered portion.

Further, according to the present invention, the unevenness on the flange side portion of the flanged pin increases the adhesion to the molded product, and the flanged pin moves together with the molded product when the molded product is removed from the recess-containing mold. Thus, air enters between the molded product and the recess-containing mold, and the molded product can be removed from the recess-containing mold. Therefore, in addition to the above effects, there is an effect that the molded product can be reliably removed from the concave portion-containing mold by the concave and convex portions on the flange side portion.

In addition, according to the present invention, the unevenness in the flange surface portion of the flanged pin increases the adhesion to the molded product, and when the molded product is removed from the recess-containing mold, the flanged pin moves together with the molded product. Then, air enters between the molded product and the recess-containing mold, and the molded product can be removed from the recess-containing mold. Therefore, in addition to the above effects, there is an effect that the molded product can be surely removed from the concave portion containing mold by the concave and convex portions of the flange surface portion.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing a molding die according to the present invention, and FIG. 2 is an enlarged cross-sectional view of part A of FIG. In the drawing, a molding die 1 is composed of an upper die 2 and a lower die 3, and a concave portion 5 that cannot be removed unless the molded product 4 formed by the upper die 2 and the lower die 3 is deformed. One of the upper mold 2 and the lower mold 3 having the concave portion 5 (hereinafter, the lower mold 3 has the concave portion 5 in this embodiment). A through hole 6 is provided in the center of the recess-containing mold 3), and a flanged pin 7 is provided in the through hole 6 to move forward and backward in the demolding direction and close the through hole 6. At the time of the mold, the flanged pin 7 moves together with the molded product 4 so that air is introduced between the molded product 4 and the recess-containing mold 3.

The molding die 1 is a molded product 4 such as a piston cup in which the divided surfaces of the upper mold 2 and the lower mold 3 cannot be applied to the surface thereof, and the mold removal is performed. Since the molded product 4 such as a piston cup is deformed, it cannot be used for a product that does not deform. The molded product 4 is made of a deformable material such as rubber or plastic.

The upper mold 2 has an injection port 10 for a molded product material, but there is no recess 5 that cannot be removed unless the molded product 4 is deformed.

The recess-containing mold 3 is a lower mold, and has the through hole 6 at the center thereof. The through hole 6 has a storage hole 11 connected to the lower side to receive the flanged pin 7 and connected to the upper side. There is a seating hole 13 for seating the flange 12 of the pin 7 with flange. The recess-containing mold 3 includes a molded product 4
There are two recesses 5 facing the upper mold 2, one being the outer recess 5 a and the other being the inner recess 5 b.

The flanged pin 7 includes a pin portion 14 and the flange 12, and is passed through the through hole 6 of the recess-containing mold 3. The flange 12 is seated in the seating hole 13 and the pin portion 14 is stored in the storage hole 11. Is done. A stopper 15 is attached to the pin portion 14 at the end on the opposite side of the flanged pin 7. In the first embodiment, the stopper 15 is fixed by screwing the bolt 16 into the pin portion 14, but any means can be used as long as the stopper 15 can be fixed to the pin portion 14. 14 and the stopper 15 may be integrally formed.

The stopper 15 moves the flanged pin 7 together with the molded product 4 when the molded product 4 is removed from the recess-containing mold 3. When the stopper 15 reaches the bottom 11 a of the storage hole 11, the stopper 15 moves. Since the stopper 15 works and the flanged pin 7 cannot move any more, the flanged pin 7 is surely detached from the molded product 4 and the molded product 4 can be taken out. Further, since the flanged pin 7 falls and returns and the flange 12 is seated in the seating hole 13, the through hole 6 can be closed.

And the stopper 15 attached to the pin 7 with a flange, and the said through-hole 6, ie,
A resilient spring 17 is provided between the bottom 11 a of the storage hole 11. Therefore, when the molded product 4 is removed from the recess-containing mold 3, the flanged pin 7 moves together with the molded product 4. When a certain distance is reached, the flange 4 is moved from the molded product 4 to the flange by the cooperation of the spring 17 and the stopper 15. The attached pin 7 comes off and the molded product 4 can be taken out. Further, the spring force of the elastic spring 17 causes the flange 12 of the flanged pin 7 to return and reliably seat in the seating hole 13, so that the through hole 6 can be reliably closed.

The flanged pin 7 is formed when the molded product 4 is removed from the recess-containing mold 3.
If the flanged pin 7 does not move, the molded product 4
Therefore, it is impossible to introduce the atmosphere between the recess-containing mold 3 and the vacuum state, so that the molded product 4 cannot be removed from the recess-containing mold 3 in effect. Therefore,
As shown in FIG. 3, a chamfered portion 12 a is provided at the peripheral edge of the flange 12 of the flanged pin 7 so that the flanged pin 7 moves together with the molded product 4 when the molded product 4 is removed. Yes. That is, due to the chamfered portion 12a, the adhesiveness with the molded product 4 is increased, and when the molded product 4 is removed from the recess-containing mold 3, the flanged pin 7 moves together with the molded product 4, so that molding is performed. The atmosphere enters between the product 4 and the recess-containing mold 3, and can be easily demolded.

Moreover, as shown in FIG. 4, the uneven | corrugated | grooved part 12 is provided in the side part in the flange 12 of the pin 7 with a flange.
Even if b is provided, the same operation and effect as in the case where the chamfered portion 12a is provided can be obtained.

Moreover, as shown in FIG. 5, the uneven | corrugated | grooved part 12 is provided in the surface part in the flange 12 of the pin 7 with a flange.
Even if c is provided, the same operations and effects as in the case where the chamfered portion 12a described above is provided can be obtained.

Next, a method of using the molding die 1 having the above configuration will be described with reference to FIGS.
FIG. 6 shows a state in which molding material is injected into the molding die 1 and molding is completed. In addition,
The molding die 1 in FIG. 6 is provided with a chamfered portion 12 a at the peripheral edge of the through hole side of the flange 12 of the flanged pin 7, and therefore has high adhesion to the molded product 4. First, as shown in FIG. 7, the upper mold | type 2 is pulled up from the recessed part containing type | mold 3, and is demolded. Next, as shown in FIG. 8, the molded product 4 is lifted against the spring force of the elastic spring 17 from the recess-containing mold 3 which is the lower mold, and demolded.

At that time, since the flanged pin 7 moves together with the molded product 4 without being removed by the chamfered portion 12a, the atmosphere enters between the molded product 4 and the recess-containing mold 3, and the vacuum state between them is eliminated. At the same time, since the molded product 4 is deformed and detached from the recess 5, it can be removed from the recess-containing mold 3. Further, when the molded product 4 is pulled up, the spring force of the elastic spring 17 becomes stronger, and finally the flanged pin 7 is detached from the molded product 4 as shown in FIG. Even if the flanged pin 7 does not come off from the molded product 4 due to the spring force of the resilient spring 17, if the molded product 4 reaches a certain distance, the cooperation of the resilient spring 17 and the stopper 15
The flanged pin 7 is always removed from the molded product 4 so that the molded product 4 can be taken out.

On the other hand, the flanged pin 7 removed from the molded product 4 falls due to the spring force of the elastic spring 17 and in addition to gravity, and the flange 12 of the flanged pin 7 is seated in the seating hole 13 of the recess-containing mold 3 ( 9), the through-hole 6 can be closed, and a preparation for the next mold forming is entered.
Furthermore, if the upper mold 2 is set in the recess-containing mold 3, the preparation for the next mold molding is completed, and if the molded product material is injected into the molding die 1, the state shown in FIG. 6 is obtained again. Thereafter, the same thing can be repeated to form the molded articles 4 one after another. In addition, the molded product 4 becomes a piston cup by separating from the line B in FIG.

Although the first embodiment of the present invention has been described above, it should be understood that the specific configuration is not limited to this, and that changes can be made as appropriate without departing from the scope of the present invention.

The molding die of the present invention can be used when it is not possible to assign the divided surfaces of the upper mold and the lower mold to the surface of the molded product, and when the molded product cannot be removed unless the molded product is deformed. In addition, the applicability is extremely high when a large number of pieces are to be taken in one molding without taking time and effort.

1 is a longitudinal sectional view showing an example of a molding die according to the present invention. It is an expanded sectional view of the A section of FIG. It is an expanded sectional view of the same shape as the A section of FIG. 1 which shows the shape of the flange in the pin with a flange of a shaping die. It is an expanded sectional view of the same shape as the A section of FIG. 1 which shows the shape of the flange in the pin with a flange of a shaping die. It is an expanded sectional view which shows the shape of the flange in the pin with a flange of the metal mold | die for shaping | molding. It is a longitudinal cross-sectional view which shows the usage method of the metal mold | die for shaping | molding. It is a longitudinal cross-sectional view which shows the usage method of the metal mold | die for shaping | molding. It is a longitudinal cross-sectional view which shows the usage method of the metal mold | die for shaping | molding. It is a longitudinal cross-sectional view which shows the usage method of the metal mold | die for shaping | molding. It is sectional drawing which shows the example of the conventional metal mold | die. It is sectional drawing of the metal mold | die for shape | molding the molded article provided with the conventional dovetail groove.

Explanation of symbols

1 Mold for molding 2 Upper mold 3 Lower mold (Concavity-containing mold)
4, a molded product 5 concave portion 5a outer concave portion 5b inner concave portion 6 through hole 7 pin with flange 10 inlet 11 receiving hole 11a bottom portion 12 flange 12a chamfered portion 12b, 12c uneven portion 13 seating hole 14 pin portion 15 stopper 16 bolt 17 bullet Spring B Type c Sheet d Dovetail e Notch f Convex

Claims (6)

A molding die comprising an upper die and a lower die, and having a recess in either one of the upper die and the lower die that cannot be removed unless the molded product of the upper die and the lower die is deformed. A through hole is provided in a central portion of one of the upper mold and the lower mold having the recess, and a flanged pin is provided in the through hole so as to move forward and backward in the demolding direction and close the through hole. When the molded product is demolded, the flanged pin moves together with the molded product, and the atmosphere is between the molded product and one of the upper mold and the lower mold having the recess. A mold for molding, characterized in that it is introduced.   The molding die according to claim 1, wherein a stopper is provided on the opposite side of the flanged pin. The molding die according to claim 1, wherein a resilient spring is mounted between the stopper of the pin with flange and the through hole of one of the upper die and the lower die having the concave portion. The chamfered portion is provided at the through hole side peripheral edge portion of the flange of the flanged pin, and the flanged pin moves together with the molded product when the molded product is removed. A molding die according to claim 1. 4. An uneven portion is provided on a side portion of the flange of the flanged pin, and the flanged pin moves together with the molded product when the molded product is removed.
Mold for molding according to item. 6. An uneven portion is provided on a surface of the flange of the flanged pin, and the flanged pin moves together with the molded product when the molded product is removed.
Mold for molding according to item.

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