JP2013107210A - Molding method of fan and apparatus of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the product accuracy and the noise control effect by a blade at the use, and to regulate the thickness (weight balance) of the blade part of a fan extremely delicately and exactly.SOLUTION: A method and an apparatus include upper and lower molds 17 and 19, and an insert 21 that is inserted in the inside of the same, and a resin is injected into the cavity that is composed of the upper and lower molds 17 and 19, and the insert 21, cooled, then demolded to form a fan 11. The insert 21 is made a trilaminar structure, a middle insert 21b locating in the center thereof is made to freely move. Moreover, the movement mechanism of the middle insert 21b locating in the center is made to have a structure such that the middle insert 21b is fixed to the upper mold 17 to freely move, and the middle insert 21b is moved to the inner side from the outer side by an adjustment piece 23.

Description

  The present invention relates to a molding method and apparatus capable of adjusting the thickness (weight balance) of each blade outer periphery of a resin fan provided with a plurality of blades on the outer periphery of a boss portion used in a blower. is there.

  In recent years, in order to reduce the weight of the fan and suppress noise caused by the blades during use, a fan having a hollow structure for each blade has been used. In order to further improve this effect, it was essential to control the hollow ratio of each blade.

  The applicant of the present invention has also proposed a molding method provided with a mechanism for controlling the hollow ratio of each blade of the rotating body as disclosed in Japanese Patent No. 3559056.

  A method for molding a rotating body such as a fan according to the invention is a molding method in which a molten resin is injected and injected into a cavity of a mold, a gas is injected when injection is completed, and a plurality of hollow blades are formed on the outer periphery of the boss portion. While sliding the slide block attached to the mold at the corresponding position of the mold to the outside of the cavity, gas is injected into each blade from the gas pressure inlet arranged at the corresponding position of each blade of the mold, and the hollow ratio of each blade is reduced. It was the structure to control (refer patent document 1).

  This molding method was characterized only by controlling the hollow ratio of each blade.

  Further, when this type of fan is molded, it is usually molded by a pair of upper and lower molds and various inserts, and the inserts are fixed to one of the upper and lower molds by fastening bolts.

  Moreover, in order to make each blade | wing of this kind fan high intensity | strength, various ribs were integrally molded.

Japanese Patent No. 3559056

  According to the method of forming a rotating body disclosed in Patent Document 1, since the main purpose is to uniformly form the hollow portion of each blade, each blade is improved when improving product accuracy and noise suppression effect during use. In order to make the wall thickness (weight balance) of the outer periphery uniform, it is necessary to carefully adjust the resin injection amount and the gas pressure, and this operation is very complicated.

  In addition, when the resin injection amount and the gas pressure are mechanically performed, a special control mechanism and system are required, which causes a rise in molding cost.

  In view of such drawbacks, the present invention suppresses the rise in manufacturing cost with a simple structure, improves the product accuracy and noise suppression effect by the blades during use, and reduces the thickness (weight balance) of each blade of the fan. It is an object of the present invention to provide a fan molding method and apparatus that can be adjusted extremely delicately and precisely.

The fan molding method and apparatus according to the present invention is a molding apparatus constituted by an upper and lower molding die and a nest inserted in the mold, and a resin is injected into a cavity formed by the upper and lower molding die and the nest, In the method and apparatus for forming a fan by demolding after cooling, the insert has a three-layer structure, and the center insert located in the center thereof can be moved forward and backward,
In addition, a mechanism for advancing and retracting the center insert located in the center is configured so that the center insert is freely attached to the upper mold, and the center insert is moved from the outside side to the inside side by an adjusting piece. Characterized by
Further, the adjustment piece has a substantially truncated cone shape with a taper shape whose outer peripheral surface widens upward, and this adjustment piece is screwed to a vertically arranged shaft, and the adjustment piece is moved to the shaft by rotating the shaft. The inner insert located at the center of the three-layer structure is fixed to the inner peripheral surface of the adjusting piece, and the distance between the inner peripheral surface of the adjusting piece and the molded body is close to or separated from the inner peripheral surface of the adjusting piece. Thus, the middle nesting can be freely advanced and retracted.

  According to the fan molding method and apparatus therefor according to the present invention, the insert has a three-layer structure, and the center insert located in the center thereof can be moved back and forth. In order to improve the deterrent effect, the thickness (weight balance) of the outer peripheral edge of each blade of the fan can be adjusted easily, delicately and precisely, and it has a simple structure and can suppress an increase in manufacturing cost.

  In addition, by adopting a three-layer structure for the inserts, the degassing effect of the molded resin is improved, and the forward and backward movement of the center insert located in the center is reliably guided by the top and bottom cover inserts. (Guide) can be.

  In addition, a mechanism for advancing and retracting the center insert located in the center is configured so that the center insert is freely attached to the upper mold, and the center insert is moved from the outside side to the inside side by an adjusting piece. By doing so, the thickness (weight balance) of the outer peripheral edge of each blade of the fan can be finely and finely adjusted, and the product accuracy can be further improved.

  Furthermore, the adjustment can be performed more delicately, densely and reliably by using a shaft and a substantially frustoconical adjustment piece screwed to the shaft as the advancement / retraction mechanism of the inner insert.

1 is an overall plan view of a fan forming apparatus according to the present invention. FIG. It is a disassembled perspective view of a nesting and an adjustment piece. It is a principal part front view which shows the nesting advance / retreat mechanism. FIG.

  A three-layer structure that intervenes in the upper and lower molds for the purpose of improving the product accuracy and noise suppression effect by the blades during use, and adjusting the thickness (weight balance) of each blade of the fan extremely delicately and precisely. This is realized by the nesting and the advancing / retreating mechanism for making the middle nesting located at the center of the three-layer structure advance and retract freely.

  A fan forming apparatus according to the present invention will be described with reference to FIGS.

  The basic structure of the fan 11 according to the present invention includes a plurality of blades 15 on the outer periphery of the boss portion 13 and is integrally formed of a thermoplastic resin material having light weight, high strength, and high durability.

The apparatus for molding the fan 11 is composed of upper and lower molding dies 17 and 19 and an insert 21 intervening therein.

  In this example, since the fan has a circular shape in plan view, the inserts 21 are arranged at a total of four locations in the top, bottom, left and right for the convenience of molding each blade located in the 1/4 arc. The shape is preferably a curved surface shape corresponding to the curved surface shape of the outer peripheral surface of each blade 15.

  The insert 21 is a mold member for adjusting and determining the thickness of the outer peripheral portion of the blade 15.

  In the present invention, the insert 21 has a three-layer structure, and includes a lid insert 21a located at the upper portion, a middle insert 21b located at the center, and a base insert 21c serving as a slide base located at the lower portion. The lid insert 21a and the base insert 21c are each one, and the middle insert 21b is sandwiched between the upper and lower inserts 21a and 21c, one on each of the left and right sides. It is only possible to move forward and backward.

  In this example, the retractable middle insert 21b is arranged so as to be positioned at the height of the upper part from the center of the insert 21 having a three-layer structure.

  The height of the inner insert 21b only needs to be lower than the height of the molded body. On the other hand, when the size of the intermediate insert 21b is large, it causes a malfunction in the adjusting operation. In addition, since the advance / retreat distance of the inner insert 21b is very small (within the thickness range of the molded product), there is no problem unless the difference from the size of the adjustment piece 23 described later is extreme.

  The advancing / retreating mechanism of the middle insert 21b located in the center causes the middle insert 21b to be freely movably attached to the upper mold 17 and moved by the adjusting piece 23 from the outer side to the inner side. It is a structure to make it.

  More specifically, the adjustment piece 23 has a substantially truncated cone shape with a taper shape whose outer peripheral surface widens upward, and this adjustment piece 23 is screwed to a vertically arranged shaft 25 so that the shaft 25 By rotating, the adjustment piece 23 is moved up and down with respect to the shaft 25, and the inner insert 21 b located at the center of the three-layer structure is fixed to the inner peripheral surface of the adjustment piece 23. By making the distance between the outer peripheral surface and the molded body close to or away from each other, the inner insert 21b can be moved forward and backward.

  In the figure, 27 is a fixing hole for the intermediate insert 21b, 29 is a locking bolt for loosening the intermediate insert 21b having a smaller diameter than the fixing hole 27, and 31 is a control protrusion for restricting the upward movement of the adjusting piece 23. Reference numeral 33 denotes an installation recess between the middle insert 21b and the adjustment piece 23 arranged in the base insert 21c.

  A method for forming a fan with the fan forming apparatus according to the present invention will be described in detail below.

  First, the upper and lower molds 17 and 19 are brought into contact with each other, and the insert 21 is moved from the outside of the upper and lower molds 17 and 19 to the molding position.

  At this time, the insert 21 is sandwiched by the lid insert 21a after the intermediate insert 21b and the adjustment piece 23 are installed in the installation recess 33 of the base insert 21c located below the insert 21 having the three-layer structure. Install.

  Next, the adjustment piece 23 is moved up and down with respect to the shaft 25 by rotating the shaft 25 so that the thickness of the outer peripheral portion of each blade 15 of the fan 11 to be molded becomes a preset thickness. The position of the inner insert 21b fixed to the outer peripheral surface of the adjusting piece 23 is adjusted by moving the distance from the formed body close to or away from the molded body.

  At this time, the reason why only the middle insert 21b positioned at the center of the three-layer insert 21 is advanced and retracted is to adjust the thickness of the outer peripheral portion of each blade 15 of the fan 11 more delicately and precisely.

  In addition, since the outer diameter of the locking bolt 29 is smaller than the diameter of the fixing hole 27 of the inner insert 21b, control is performed so that adjustment is possible only within a distance corresponding to the difference in diameter.

  By the way, if the entire nest 21 having a three-layer structure can be moved forward and backward, the wall thickness of the outer peripheral portion of each blade 15 is greatly changed by a slight movement, so that delicate and precise adjustment cannot be performed.

  Next, a thermoplastic resin is injected into the cavity formed by the upper and lower molds 17 and 19 and the insert 21, and after cooling, the mold is removed to mold the fan.

  In this example, the nest 21 has a three-layer structure, but it is obvious that the nest 21 has four or more layers, and one or a plurality of middle nests positioned at the central portion thereof can be advanced and retracted.

  Moreover, although the arrangement | positioning position of the center insert 21b is a position of the height of the upper part from the center of the insert 21 of a three-layer structure, since the effect of this invention is fully acquired also as a center part, its position Is not particularly limited.

  Further, although it is fixed to the upper mold 17 so as to be freely movable, it is obvious that it can be freely fixed to the lower mold 19.

  Further, the advancing / retreating mechanism of the middle insert 21b is based on the shaft 25 and the adjusting piece 23, but other mechanisms can be freely adopted.

  The resin used to mold the fan is a thermoplastic resin, but the type is not particularly limited as long as it is a general meltable resin used in resin molding.

  Further, with respect to the resin molding temperature and the resin injection location, the advancement / retraction distance of the inner insert 21b by the adjustment piece 23 is within the thickness range of the outer peripheral portion of the fan blade, which is a molded body. The distance is not moved as much as possible to cause malfunction, and the temperature and location are not particularly limited.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the first embodiment, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.

  The molding apparatus and method according to the present invention are optimal for molding a fan, but can also be applied to uses such as molding of other resin products.

11 Fan 17 Upper mold 19 Lower mold 21 Insert 21b Middle insert 23 Adjustment piece 25 Shaft

Claims (6)

An apparatus for forming a fan, comprising an upper and lower mold and an insert inserted therein, wherein the insert has a three-layer structure, and an intermediate insert positioned at the center of the three-layer structure can be moved forward and backward. 2. An advancing / retracting mechanism for moving the center insert from the outer side to the inner side with an adjusting piece, wherein the center insert is fixed to the upper mold so as to be freely movable. The fan forming apparatus as described. The adjustment piece has a substantially truncated cone shape with a taper shape whose outer peripheral surface widens upward, and this adjustment piece is screwed to a vertically arranged shaft, and the adjustment piece is attached to the shaft by rotating the shaft. 3. A fan according to claim 2, characterized in that it can be moved up and down, and an inner insert located at the center of the three-layer structure is fixed to the inner peripheral surface of the adjusting piece so that the inner insert can be moved forward and backward. Molding equipment. In a molding machine composed of an upper and lower mold and an insert inserted therein, a resin is injected into the cavity formed by the upper and lower mold and the insert, and after cooling, the fan is molded by demolding In the molding method, the fan has a three-layer structure, and the middle insert located in the center of the insert can freely move back and forth. The structure of the center insert advancement / retraction mechanism located in the center is a structure in which the center insert is fixed to the upper mold so as to be freely movable, and this center insert is moved from the outside side to the inside side by an adjusting piece. The fan molding method according to claim 4. The adjustment piece has a substantially truncated cone shape with a taper shape whose outer peripheral surface widens upward, and this adjustment piece is screwed to a vertically arranged shaft, and the adjustment piece is attached to the shaft by rotating the shaft. The inner insert located at the center of the three-layer structure is fastened to the inner outer peripheral surface of the adjustment piece, and the distance between the inner outer peripheral surface of the adjustment piece and the molded body is close and separated, 6. The fan molding method according to claim 5, wherein the middle insert is freely retractable.

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