JPH10296751A - Molding tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding tool for molding a molded product such as an operation button composed of a push button of an electronic equipment to be manufactured in a short period of time and at low cost. SOLUTION: A section having a recessed section 30 for forming an operation face 16 composed of a glossy surface of a push button 15 and a section for forming a side face 19 from a hairline processing face are provided respectively on a top force 23 and an auxiliary mold 25, and the top force 23 and the auxiliary mold 25 are split by a beveled inclined face 18 on the outer peripheral section of the operation face 16 and a hairline boundary section and molded by a steel material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die, and more particularly to a molding die for obtaining a molded product having a different surface condition depending on a portion, such as an operation button provided on an operation section of an electronic device.

[0002]

2. Description of the Related Art For example, an operation button such as a push button attached to an operation section of a tape recorder has a display section formed on a top surface of the operation surface thereof, and such a display section is formed. The top surface is a glossy surface.
On the other hand, the side surface of the push button is subjected to a hairline process so that the scratches when pulling out from the mold are inconspicuous or are not damaged later. In the hairline processing, a large number of strips are formed that extend in a direction separating from the mold during molding.

FIGS. 6 to 8 show a conventional molding method for molding such a push button. That is, as shown in FIG. 6, the master mold 1 having the same shape as the push button is made of, for example, brass. The master mold 1 has a glossy surface on the upper surface and an operation surface, and has a side surface on which a hairline processing made of a strip is applied.

[0004] Such a master mold 1 is placed in an electrolytic plating tank, and a nickel plating layer 2 is formed on the surface thereof as shown in FIG. 7 by passing an electric current. When using beryllium, the beryllium plating layer is formed thick by pouring. The outer shape of the nickel deposit 2 is processed, and at the same time, the inner master die 1 is removed, and the deposit 2 is fitted into the recess 4 of the upper die 3 as shown in FIG. Then, a molding die is assembled by combining such an upper die 3 with a lower die 5. The molten resin 7 is placed in the cavity 6 between the upper die 3 and the lower die 5 of such a molding die.
By pressing, the inner surface of the nickel deposit 2 becomes a cavity and a push button is formed.

[0005]

As described above, conventionally, the mold cavity 6 is inverted from the master mold 1 by the deposit 2 of the plating based on nickel or beryllium.
Is formed, and the precipitate 2 having such a cavity 6 is incorporated into the concave portion 4 of the upper mold 3.

In such a conventional molding die, not only is the production of the master die 1 extremely troublesome, but also it takes several minutes to deposit the nickel plating layer 2 on the outer peripheral surface of the master die 1 to a required thickness. It took about a week to a month, which increased the time required for mold production. In addition, there is a problem that both the nickel material and the beryllium material are soft and have poor durability. Because of this, maintenance was lacking. In addition, since the material is expensive and the processing requires a long time, the cost of the mold is high. Furthermore, such a conventional mold cannot form an air vent for venting air at a position corresponding to a top surface of a molded product.
As a result, there is a problem that molding conditions are limited.

[0007] The present invention has been made in view of such problems, and a period for manufacturing a mold is short.
It is an object of the present invention to provide a mold that is inexpensive, has excellent durability, and is easy to maintain.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a molding die for obtaining a molded product having a different surface condition depending on a portion, wherein the molding die is divided according to a portion having a different surface condition. The present invention relates to a mold that is fastened.

The portion for forming the glossy portion and the portion for applying the hairline processing may be divided from each other. Further, the surface of the portion to be subjected to the hairline processing may be formed of a surface on which a strip is formed extending in the direction in which the molded product is removed.

A part or all of the innermost part of the cavity is formed of a surface forming a glossy portion so as to correspond to the upper surface of the molded article, and the side of the cavity corresponding to the side surface of the molded article is subjected to hairline processing. And a slanted chamfering process may be performed between a portion for forming a glossy portion and a portion for performing hairline processing. The end of the chamfer may be a step that is substantially parallel to the innermost part of the cavity and coincides with the division surface, and the side surface of the cavity may be formed perpendicular to the step.

[0011] Further, each part of the molding die divided from each other may be made of a steel material.

[0012]

1 to 3 show a push button 15 formed by a mold according to an embodiment of the present invention. The push button 15 is, for example, an injection-molded article formed of an ABS resin. The push button 15 constitutes an operation surface 16 whose top surface is formed of a glossy surface. On the operation surface 16, a display 17 made of a projection is formed.
On the other hand, the periphery of the operation surface 16 of the push button 15 is constituted by an inclined surface 18 chamfered by about 45 °.

The side surface of the push button 15 is constituted by a hairline processed side surface 19. In the hairline processing, a large number of strips are formed in the pull-out direction after molding of the push button 15, that is, in the height direction. Such a hairline processing 19 is characterized in that scratches at the time of die removal after molding become less noticeable, and that scratches are less likely to occur when the push button 15 is slid.

FIGS. 4 and 5 show an injection mold for molding such a push button 15. FIG. This molding die includes an upper die 23, a lower die 24, and an auxiliary die 25 used in combination with the upper die 23. The auxiliary mold 25 is fastened to the lower surface of the upper mold 23 by bolts 26 constituting fastening means.

A recess 30 is formed on the lower surface of the upper die 23. The concave portion 30 is a surface for forming the operation surface 19 of the push button 15 having a glossy surface, and has a glossy surface. Moreover, the display recess 31 is formed in the recess 30. Such a display concave portion 31 is for forming the display 17 composed of a projection on the operation surface 16.

An outer peripheral portion of the recess 30 is formed as an inclined surface 32. Such an inclined surface 32 is a chamfered inclined surface 18 on the outer peripheral side of the operation surface 16 of the push button 15.
Is formed. As shown in FIG. 5 in an enlarged manner, the end of the inclined surface 32 is formed as a step 33 having a surface parallel to the surface of the recess 30. This step 33 has a very small lateral dimension d, for example 10 to 2
The value is set to about 0 μ. And the inclined surface 32
Is also finished with flat precision to form a glossy surface.

On the other hand, the auxiliary mold 25 has an opening 36 formed therein. The opening 36 is for forming the side surface 19 of the push button 15, and is formed on the outer peripheral surface thereof in such a manner that the irregularities of the hairline processing are reversed.

That is, here, the operation surface 1 made of a glossy surface
6 is formed on the upper die 23, and a surface for forming the side surface 19 formed by the hairline processing surface is provided on the inner peripheral surface of the opening 36 of the auxiliary die 25, and these are connected to each other. Mold. By injecting the molten resin 42 into the cavity 40 of such a molding die through the gate 41, the push button 15 as shown in FIGS. 1 to 3 is injection molded.

As described above, in the present embodiment, the molding die for forming the cavity 40 is composed of the upper die 23 and the auxiliary die 25, and the step 33 of the stepped portion 33 corresponding to the end of the inclined surface 18 of the push button 15 is formed. The structure is divided into two parts with the surface coinciding with the surface as a boundary. Then, the upper die 23 and the auxiliary die 25 are fixed by fastening means including bolts 26.

The upper die 23 has an inclined surface 32 and a display recess 31.
And a concave portion 30 formed of a glossy surface having the following.
The upper die 23 is easily gloss-processed independently of the auxiliary die 25, and the surface of the concave portion 30 is processed.

On the other hand, on the inner surface of the opening 36 of the auxiliary mold 25, irregularities formed of inverted strips corresponding to the hairline processing are formed, and the portions having such irregularities are independent of the upper mold 23. The auxiliary mold 25 is formed by hand processing or etching processing from the lower end of the step 33 to the division surface with the lower mold 24. At this time, since the upper mold 23 is separated, processing is performed without performing masking.

The electric discharge machining for previously forming the cavity 40 continuous from the concave portion 30 to the opening 36 is performed by the upper die 23.
And the auxiliary mold 25 are integrally processed by bolts 26. Further, after the hairline processing of the inner peripheral surface of the opening 36 of the auxiliary mold 25, as shown by d in FIG. 5, the step portion 33 is formed in a state protruding from the end of the inclined surface 32 by about 10 to 20 μ. When such a step portion 33 is formed, the end of the inclined surface 18 of the formed push button 15 becomes sharp, and the appearance as a high-precision high-grade molded product can be provided.

According to the molding die according to the present embodiment, the upper die 23, the lower die 24, and the auxiliary die 25 can be made of a steel material having a high hardness. A mold can be manufactured in a short period of time using a material having excellent performance and at a low cost.

As described above, the molding die according to the present embodiment
It is composed of a mold made of steel, and has an inclined surface 32 and an opening 3.
6 is divided into an upper mold 23 and an auxiliary mold 25 by a boundary surface formed between the upper mold 6 and the auxiliary mold 25. In addition to processing the glossy portion by polishing the surface, the auxiliary mold 25 employs a method of processing the inner peripheral surface of the opening 36 by hairline processing by processing such as etching.

Therefore, according to such a configuration, it is possible to manufacture a molding die without using a master die and without using a deposit of nickel or berium plating. For this reason, there is an advantage that the manufacturing period of the mold is short and the cost of the mold is low. Moreover, since the upper mold 23, the lower mold 24, and the auxiliary mold 25 can all be made of steel, the cost of the mold is reduced, the durability is excellent, and the cavity 40 is formed. This eliminates the need for cavity spares such as nickel deposits. In addition, the maintenance of the mold can be performed very easily.

[0026]

As described above, the present invention relates to a mold that is divided according to portions having different surface states and is fastened by fastening means.

According to such a molding die, it is possible to process each surface in the divided state, and it is possible to easily produce the molding die, and particularly to easily perform the surface processing.

According to the configuration in which the part for forming the glossy part and the part for performing the hairline processing are divided from each other, the part for forming the glossy part and the part to be subjected to the hairline processing are separated from each other and the respective surfaces are processed. It becomes possible.

According to the structure in which the surface of the portion to be subjected to the hairline processing is formed of a surface formed with a strip extending in the drawing direction of the molded product, it is possible to perform the molding in which scratches generated when the molded product is removed from the molding die are not noticeable. A possible mold can be provided.

A part or all of the innermost part of the cavity is formed of a surface forming a glossy portion so as to correspond to the upper surface of the molded article, and the side of the cavity corresponding to the side surface of the molded article is subjected to hairline processing. According to the configuration in which the oblique chamfering process is performed between the portion for forming the glossy portion and the portion to be subjected to the hairline processing, the upper surface has a glossy portion, or a molded product. It is possible to form a molded product having a hairline process applied to its side surface, and the boundary between the two is formed by a chamfered inclined surface.

According to the configuration in which the end of the chamfer is a step that is substantially parallel to the innermost part of the cavity and coincides with the division surface, and the side surface of the cavity is formed perpendicular to the step, It becomes possible to cleanly form the boundary between the chamfered inclined surface and the hairline processed side of the product,
It is possible to provide a molding die capable of molding a high-quality molded product.

According to the configuration in which each of the parts divided from each other is made of a steel material, it is possible to provide a molding die which is excellent in durability, does not require a cavity spare, and is inexpensive.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a push button of a tape recorder.

FIG. 2 is a plan view of the push button.

FIG. 3 is a vertical sectional view of the push button.

FIG. 4 is a longitudinal sectional view of a molding die for molding a push button.

FIG. 5 is an enlarged vertical sectional view of the main part.

FIG. 6 is a longitudinal sectional view of a master mold for molding a conventional push button.

FIG. 7 is a longitudinal sectional view showing a nickel plating deposit formed on a master mold.

FIG. 8 is an enlarged vertical sectional view of a main part of a mold for molding a conventional push button.

[Explanation of symbols]

1 ‥‥ master mold, 2 ‥‥ nickel plating layer, 3 ‥‥ upper mold, 4 ‥‥ recess, 5 ‥‥ lower mold, 6 ‥‥ cavity, 7 ‥
{Molten resin, 15} Push button, 16} Operation surface (top surface, glossy surface), 17} Display (projection), 18} Inclined surface (chamfered), 19} Side surface (hairline processed surface), 23 {Upper type, 24} Lower type, 25} Auxiliary type, 26} Bolt (fastening means), 30} recess, 31} Display recess, 3
2 ‥‥ slope, 33 ‥‥ step, 36 ‥‥ opening, 40 ‥‥
Cavity, 41 ‥‥ gate, 42 ‥‥ molten resin

Claims (6)

[Claims] 1. A molding die for obtaining a molded product having a different surface condition depending on a portion, wherein the molding die is divided according to a portion having a different surface condition, and is fastened by fastening means. Mold. 2. The molding die according to claim 1, wherein a part for forming the glossy part and a part for performing the hairline processing are divided from each other. 3. The molding die according to claim 2, wherein the surface of the portion to be subjected to the hairline processing is a surface formed with a strip extending in a direction in which the molded product is removed. 4. A part of the innermost part of the cavity or the whole area thereof is formed with a surface forming a glossy portion so as to correspond to the upper surface of the molded article, and a part of the side surface of the cavity corresponding to the side surface of the molded article is subjected to hairline processing. 4. The molding die according to claim 3, wherein the molding die comprises a surface to be applied, and a slanted chamfering process is performed between a portion for forming a glossy portion and a portion for performing hairline processing. 5. An end of the chamfer is substantially parallel to the innermost portion of the cavity and is a step which coincides with the dividing surface, and a side surface of the cavity is formed perpendicular to the step. The mold according to claim 4, wherein: 6. The molding die according to claim 1, wherein each of the divided parts is made of a steel material.