JP2714558B2 - Mold for molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die having an upper die and a lower die suitable for forming a molded product having a curved surface.

[0002]

2. Description of the Related Art Generally, a metal fan having a plurality of blades used for a blower or the like is press-formed by a forming die.

Conventionally, this type of molding die has an upper die and a lower die, and a molding surface of a fan is formed on each of opposing surfaces of the upper die and the lower die. Fan blanks (intermediate products) obtained by punching were formed by press molding with upper and lower mold surfaces.

[0004]

However, the conventional molding die described above has the following problems.

[0005] First, it is necessary to form a curved surface portion for molding the blade on the mold surface of the mold, and it is necessary to uniformly form each mold surface corresponding to the plurality of blades. The manufacture of the mold is not easy, and the cost of the mold itself is greatly increased.

Second, when the size and shape of the fan are different, it is necessary to manufacture a mold for each type of fan, which is inferior in versatility and economy.

[0007] The present invention has been made to solve the problems existing in the prior art, and aims to provide a molding die which can achieve a great cost reduction and is excellent in versatility and economy.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a method of forming a molding die 1 having an upper die 2 and a lower die 3 for molding a molded product M having a curved surface portion R. 2
When the mold is closed, the molding material M
, 7a, 6a, 6b,..., 7a, which press different positions of the molding material Mo in opposite directions when the mold is closed to form curved surfaces R. 7b are provided.

In this case, according to a preferred embodiment, the molding die 1 is suitable for molding a fan F having a plurality of blades Fr. The molding material fixing portions 4 and 5 are provided at the center of each of the opposing surfaces 2f and 3f, and the opposing surfaces 2f and 3f are provided.
It is provided so that it can be pushed into 3f. On the other hand, the push pin portion 6a
, 7a are around the molding material fixing portions 4, 5,
In the fan F, it is provided at a position corresponding to one side and the other side of each blade Fr..., And is provided on the opposing surfaces 2f, 3f so as to be detachable or changeable in position. Note that the tips of the push pins 6a, 7a are spherical.

Thus, when molding, the molding material Mo is positioned and set in the molding material fixing portion 5 of the lower mold 3, and the upper mold 2 is lowered to close the mold. 2
Are fixed between the molding material fixing portion 4 of the lower mold 3 and the molding material fixing portion 5 of the lower mold 3, and different positions of the molding material Mo are pressed in opposite directions by the push pin portions 6a, 7a, The curved portions R are formed by being twisted.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a preferred embodiment of the present invention.

First, the configuration of a molding die 1 according to this embodiment will be described with reference to FIGS. The molding die 1 of the embodiment is a fan molding die for molding a fan F used for a blower or the like having eight blades Fr (curved surface portions R) as shown in FIG. The type is exemplified.

As shown in FIG. 2, the molding die 1 comprises an upper die 2 which is movable (elevating) and a lower die 3 which is fixed.

The upper die 2 has a movable platen 11, and the movable platen 1
An upper die body 12 is provided on the lower surface of the first die 1. The upper die body 12 includes a flat upper die base block 13 having a predetermined thickness, and a lower surface of the upper die base block 13 is an opposing surface 2f. Then, the movable platen 11 and the upper base block 13
An insertion hole 14 is provided at the center of the (opposing surface 2f), and the column-shaped molding material fixing portion 4 is accommodated in the insertion hole 14. In this case, in the natural state, the position of the molding material fixing portion 4 is regulated at a position protruding downward by a predetermined length from the facing surface 2f, and at the same time, the molding material fixing portion 4 is urged downward by the spring 15 so that the molding material fixing portion 4 becomes an upper die. It can be pushed into the base block 13 side.
Reference numeral 16 denotes a concave portion formed on the lower surface of the molding material fixing portion 4, and accommodates a projection portion (motor shaft mounting portion Fs) of the molding material Mo when the mold is closed.

On the other hand, around the molding material fixing portion 4,
On the opposing surface 2f, eight push pins 6a, 6b, 6c ...
Are provided at equal intervals in the circumferential direction. In this case, the push pin portion 6a
(The other push pin portions 6b are also the same) are formed in a round bar shape, provided with a screw portion 6n at one end, and screwed to the facing surface 2f.
The other end (tip) of the push pin portion 6a is formed into a spherical surface. Thereby, the push pin portion 6a can be attached to and detached from the facing surface 2f, and can be replaced with another push pin portion having a different length or shape, for example. In addition, the position of the push pin portion 6a is selected at a position where the upper surface of the blade Fr of the fan F can be pressed at the time of molding.

On the other hand, the lower die 3 has a fixed platen 21, and a lower die body 22 is provided on the lower surface of the fixed platen 21. Lower die body 2
2 is a flat base mold block 2 having a predetermined thickness.
3 and the upper surface of the lower die base block 23 is the facing surface 3f. In the center of the fixed platen 21 and the lower die base block 23 (the opposing surface 3f), a columnar material fixing portion 5 on the lower die side is provided. In this case, the mounting structure of the molding material fixing portion 5 is the same as that of the molding material fixing portion 4, and the molding material fixing portion 5 is restricted in its natural state at a position protruding a predetermined length upward from the facing surface 3 f. At the same time, it can be pushed into the facing surface 3f. However, the pressing limit position of the molding material fixing portion 5 is set, and when the molding die 1 is closed, positioning in the axial direction with respect to the molding material Mo is performed. As shown in FIG. 3, a positioning convex portion 24 for positioning the molding material Mo in the surface direction is provided at the center of the upper surface of the molding material fixing portion 5, and a plurality of positioning convex portions 24 are provided near the positioning convex portion 24. Are provided.

On the other hand, around the molding material fixing portion 5,
On the opposing surface 3f, eight push pin portions 7a, 7b, 7c...
Are provided at equal intervals in the circumferential direction. In this case, the push pin portion 7a
(The other push pin portions 7b are also the same) are formed in a round bar shape, and, similarly to the push pin portion 6a, are provided with a screw portion at one end so that the facing surface 3 is formed.
f, and the other end (tip) of the push pin portion 7a is formed into a spherical surface. As a result, the push pin portion 7a moves to the facing surface 3f
Attach and detach. Further, the position of the push pin portion 6a described above is selected at a position where the upper surface of the blade Fr of the fan F can be pressed at the time of molding, but the position of the push pin portion 7a is
Select a position at which the other side of r can be pressed. In addition, 8
a, 8b, 8c... are push pin portions 6a, 6b, 6c, respectively.
Are restriction pin portions provided on the opposing surface 3f so as to face.

Next, a method of molding the fan F (molded product M) using the molding die 1 according to the present embodiment will be described with reference to FIGS.

First, by punching a metal plate,
The flat first fan blank Mf shown in FIGS. 4 and 5 is manufactured. The first fan blank Mf has a circular shape, has eight slits S... Extending from the outer peripheral edge toward the center toward the center at equal intervals in the circumferential direction, and has a through hole H at the center. On the surface between H and slits S, there are a plurality of positioning holes Fc that are positioned by fitting into positioning projections 25.

Next, a cylindrical motor shaft mounting portion Fs is formed at the center of the first fan blank Mf.
The molding material (second fan blank) Mo as shown in FIG. Then, the molding material Mo is positioned and set on the molding material fixing portion 5 of the lower mold 3 in the mold open state shown in FIG. At this time, the motor shaft mounting portion Fs of the molding material Mo is fitted into the positioning projection 24, and the positioning hole Fc is fitted into the positioning projection 25.

Thereafter, as shown in FIG. 1, if the upper mold 2 is lowered to close the mold, the molding material Mo is fixed to the molding material fixing portion 4 of the upper mold 2 and the molding material fixing portion of the lower mold 3. 5 and the positions corresponding to one side and the other side of each blade Fr...
7a are pressed in the opposite direction and twisted to form blades Fr (curved surface portions R). FIG. 6 shows the fan F (molded product M) formed in this manner.

The embodiment has been described in detail above.
The present invention is not limited to such an embodiment.
For example, the push pin portion may be changed to a position such as reference numeral 6p (7p) shown in FIG. 3 by forming a screw hole at an arbitrary position on the facing surface 3f (facing surface 2f). Thereby, a fan (molded product) having a different size can be formed only by changing the push pin portion or changing the position. Although the push pin portion is configured to be detachable by the screw portion 6n, the push pin portion 7a of FIG. 2 may be configured to be detachable by an embedding type in which a flange portion is provided as shown by an imaginary line in the push pin portion 7a. Good. Furthermore, although the molded article is exemplified by a fan, it can be applied to any molded article having a curved surface portion. Therefore, for example, a U-shaped curved surface is formed by providing two push pins in the upper mold and providing one push pin located in the middle of the two push pins in the lower mold. You can also. Note that the upper mold and the lower mold are not meant to be arranged vertically, but may be arranged left and right. In addition, the configuration, shape, quantity, material, etc. of the details can be arbitrarily changed without departing from the spirit of the present invention.

[0023]

As described above, according to the present invention, in a molding die having an upper mold and a lower mold for molding a molded article having a curved surface portion, each of the opposing surfaces of the upper mold and the lower mold is provided with a mold closure. Since a molding material fixing portion that fixes the molding material at the time and a push pin portion that presses a different position of the molding material in the opposite direction when the mold is closed to form a curved surface portion are provided, respectively, It has a remarkable effect.

Since it is not necessary to form a curved surface on the mold surface of the molding die, it is easy to manufacture the die, and the cost of the die itself can be greatly reduced. Further, since the conventional press can be used as it is, it can also contribute to a reduction in equipment costs.

Even when the size and shape of the molded product are different, for example, it can be handled only by changing the position of the push pin portion or replacing the push pin portion with a different push pin portion, which is excellent in versatility and economy.

[Brief description of the drawings]

FIG. 1 is a front structural view of a molding die according to the present invention when the mold is closed,

FIG. 2 is a front configuration diagram of the molding die when the mold is opened,

FIG. 3 is a plan view of a lower mold in the molding die;

FIG. 4 is a plan view of a fan blank used when molding a fan using the molding die,

FIG. 5 is a front view showing the first fan blank;

FIG. 6 is a front view of a fan molded by the molding die,

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding die 2 Upper die 2f Opposed surface 3 Lower die 3f Opposed surface 4 Molded material fixing part 5 Molded material fixing part 6a ... Push pin part 7a ... Push pin part R ... Curved surface part M Molded product Mo Molded material Fr ... feather F fan

Continuing from the front page (72) Inventor Isao Kawakami 10 Matsukawamura, Kitaazumi-gun, Nagano Prefecture Kawakami Works Co., Ltd. (56) References JP-A-60-99499 (JP, A) JP-A-60-108598 (JP, A )

Claims (8)

(57) [Claims] 1. A molding die having an upper mold and a lower mold for molding a molded article having a curved surface portion, wherein the molding material is fixed to each of the opposing surfaces of the upper mold and the lower mold when the mold is closed. And a push pin for pressing a different position of the material in the opposite direction when the mold is closed to form a curved portion. 2. The molding die according to claim 1, wherein the molding die is applied to a fan molding die for molding a fan having a plurality of blades. 3. The molding die according to claim 1, wherein the molding material fixing portion is provided at a center of the facing surface. 4. The molding material fixing portion is provided so as to be able to be pushed into the facing surface.
The molding die described in the above. 5. The device according to claim 1, wherein the push pin portion is provided around the molding material fixing portion and at a position corresponding to one side and the other side of each blade of the fan. 4. The molding die according to 2 or 3. 6. The molding die according to claim 1, wherein the push pin portion is detachably provided on the facing surface. 7. The molding die according to claim 1, wherein the push pin portion is provided on the facing surface so as to be changeable in position. 8. The molding die according to claim 1, wherein the push pin portion has a spherical tip.