JP2022140389A - Mold of blower fan comprising twisted blade, and method for forming blower fan - Google Patents

Abstract

To integrally mold a blower fan having twisted unit blades, the blower fan having many unit blades sandwiched with a first disc and a second disc.SOLUTION: An insertion mold 60 for molding a ventilation path between unit blades 30 of a blower fan 1 is configured by laminating an insertion reciprocating mold 62 and an insertion undulated mold 72. The blower fan is molded at a molding position (a); the insertion undulated mold 72 is kept at the molding position, and only the insertion reciprocating mold 62 is moved in a radial direction (b. first intermediate position); next, while rotating the insertion undulated mold 72 around a tilting shaft 67 to lower a tip 73, both the insertion reciprocating mold 62 and the insertion undulated mold 72 are moved in the radial direction (c to e); and then, the tilting of the insertion reciprocating mold 62 is stopped from this position (e. second intermediate position), and both the insertion reciprocating mold 62 and the insertion undulated mold 72 are moved in the radial direction to a demolding position (f).SELECTED DRAWING: Figure 5

Description

The present invention relates to a molding die for molding a resin blower fan having a large number of unit blades, which is suitable for twisted unit blades, and a blower fan molding method.

A resin-made blower fan has a structure in which a large number of unit blades are arranged and sandwiched between a first disk and a second disk, and an air passage is formed between the unit blades. Further, in the blower fan, the number of unit blades and the bent shape are complicated in order to increase the air volume and air pressure.
When molding such a blower fan, generally, the first or second disk is molded integrally with the unit blade, and the separately molded second or first disk is attached with an adhesive. , or by ultrasonic vibration. However, since the joint surface may be weakened, techniques for integral molding have been proposed (Patent Documents 1 and 2).

When molding such a blower fan by integral molding, the thickness of the blower fan on the center side (the distance between the first disc and the second disc) is thicker than the outer periphery, and the molded blower fan Since the insertion mold that molded the unit blades could not be removed from the air duct, it was necessary to devise a method. After the tip side of one mold is inclined to reduce the thickness of the tip of the mold, the mold is removed by moving the entire mold in the radial direction (Patent Document 1). Furthermore, when the thickness on the rotating shaft side of the blower fan becomes thicker or when the bending of the blades becomes large, the insertion mold is divided into three and the center side of the two divided molds is divided. A structure has also been proposed in which the entire mold is radially opened after tilting the mold lower (Patent Document 2).

JP 2012-148562 A JP 2017-87706 A

However, in the case of a blower fan having twisted blades, it was not possible to remove the mold from the air duct simply by dividing the insertion mold and inclining the center side.

The present invention solves the above problems by dividing the insertion mold so that the center side can be tilted, and by allowing the entire insertion mold to reciprocate while being gradually tilted.

That is, the first invention of this molding die is a blade group in which a large number of twisted unit blades are arranged rotationally symmetrically around a rotation axis, and a first disk centered on the rotation axis and a second circle. A mold for integrally molding a resin-made blower fan having a structure sandwiched between plates, the blower fan having torsion blades characterized as follows.
(1) The unit blade of the blower fan has an outer edge on the radial side positioned near the outer circumference of the first disk and the second disk, and an inner edge on the rotating shaft side of the unit blade extending from the rotating shaft. It was formed obliquely with respect to the radial direction and the outer peripheral direction of each disc.
(2) The molding die comprises a first die for molding the outer surface side of the first disc and a second die for shaping the outer surface side of the second disc, and each of the dies and a third mold for forming the blades in cooperation with, and a control mechanism for controlling these operations. Further, the third mold comprises an insertion mold corresponding to the air passage of the blower fan inside a mold base that can be separated from the first mold and the second mold, The insertion mold includes an insertion reciprocating mold that can move in the centripetal direction and radial direction with respect to the rotation axis, and an insertion undulating mold that tilts up and down around the tilting axis to move from the "up" position to the "down" position. A structure in which the mold is laminated.
(3) The control mechanism is configured so that the first mold, the second mold and the third mold can take a closed "molding position" and an open "mold removing position". . Furthermore, the control mechanism has a "molding position" where the insertion mold of the third mold approaches the rotating shaft for molding, and a "molding position" located radially from the outer periphery of the first disk and the second disk. and the insertion mold is configured to be movable between the molding position and the demolding position.
(4) The control mechanism causes the insertion luffing die to remain at the molding position, moves only the insertion reciprocating die to a predetermined position in the radial direction, and then gradually moves the insertion luffing die toward the center side to the insertion reciprocating die. The insertion reciprocating mold is configured to move in the radial direction at the same time as tilting about the tilting axis toward the mold side.

In addition, a second invention of a molding die is a blade group in which a large number of twisted unit blades are arranged rotationally symmetrically around a rotation axis, and a first disk and a second circle centered on the rotation axis are formed. A mold for integrally molding a resin-made blower fan having a structure sandwiched between plates, the blower fan having torsion blades characterized as follows.
(1) The unit blade of the blower fan has an outer edge on the radiation side located near the outer circumference of the first disk and the second disk, and an inner edge on the rotating shaft side of the unit blade that extends from the rotating shaft. It was formed obliquely with respect to the radial direction and the outer peripheral direction of each disc. Further, as a virtual chord line connecting the center-side end and the radial-side end of the unit blade, the unit blade is formed such that the middle portion is convex in one direction with respect to the virtual chord line, and In the unit blade, when the blade has a first virtual chord line on the side of the first disk and a second virtual chord line on the side where the blade contacts the second disk, the "first The "virtual chord line" and the "second imaginary chord line" were arranged to intersect in the rotation axis direction.
(2) The molding mold includes a first mold for molding the outer surface side of the first disc and a second mold for molding the outer surface side of the second disc, and each of the molds and a third mold for forming the blades in cooperation with, and a control mechanism for controlling these operations. Further, the third mold comprises an insertion mold corresponding to the air passage of the blower fan inside a mold base that can be separated from the first mold and the second mold, The insertion mold includes an insertion reciprocating mold that can move in the centripetal direction and radial direction with respect to the rotation axis, and an insertion undulating mold that tilts up and down around the tilting axis to move from the "up" position to the "down" position. A structure in which the mold is laminated.
(3) The control mechanism is configured so that the first mold, the second mold and the third mold can take a closed "molding position" and an open "mold removing position". . Further, the control mechanism has a "molding position" where the insertion mold of the third mold approaches the rotating shaft for molding, and a "molding position" where the insertion mold is located radially from the outer circumferences of the first disk and the second disk. and the insertion mold is movable between the molding position and the demolding position, and following the molding position, there are a first intermediate position, a second intermediate position, and the demolding position. It is configured so that it can be positioned in order with the position.
(4) The control mechanism is arranged such that, from the molding position of the insertion mold to the first intermediate position, the insertion hoisting mold remains at the molding position and only the insertion reciprocating mold moves radially to a predetermined position. Configured. Further, the front control mechanism radially moves the reciprocating insertion die and the insertion luffing die from the first intermediate position to the second intermediate position of the insertion die to a predetermined position, and at the same time moves the insertion luffing die. The mold is configured so that the center side is gradually tilted to a predetermined position toward the insertion reciprocating mold side around the tilting axis. Further, the control mechanism maintains the tilting state of the insertion undulating mold at a predetermined position from the second intermediate position of the insertion mold to the demolding position, and operates the reciprocating insertion mold and the insertion undulation mold. configured to move radially.

Further, in the invention of the molding die, the molding die for a blower fan having torsion blades is characterized in that it is configured as follows.
(1) An operation member that moves in the direction of the rotation axis is provided in the insertion reciprocating mold, and an operation concave surface is formed in the insertion undulating mold with which one end of the operation member abuts,
(2) The control mechanism is such that the operating member does not press the operating concave surface from the forming position to the first intermediate position, and when the operating member reaches the first intermediate position, one end of the operating member presses the operating concave surface. Then, the insertion and luffing die is controlled to tilt about the tilting axis, and the insertion and luffing die and the insertion and reciprocating die are moved in the radial direction.

Further, in the above invention of the molding die, there is provided a molding die for a blower fan having torsion blades, characterized in that it is configured as follows.
(1) A connecting annular member that can rotate coaxially with the shaft of the blower fan is arranged at a position where it does not interfere with the first, second and third molds.
(2) One point of the connecting annular member and one end of the link rod are axially fixed, and the other end of the link rod and the insertion reciprocating die are axially fixed.

Further, according to the invention of the forming method, a group of blades in which a large number of twisted unit blades are arranged rotationally symmetrically around a rotation axis is sandwiched between a first disk and a second disk centered on the rotation axis. A molding method for integrally molding a resin-made blower fan having a formed structure with a molding die, wherein the blower fan having torsion blades is characterized by being configured as follows.
(1) The unit blade of the blower fan has an outer edge on the radiation side located near the outer circumference of the first disk and the second disk, and an inner edge on the rotating shaft side of the unit blade that extends from the rotating shaft. It was formed obliquely with respect to the radial direction and the outer peripheral direction of each disc.
(2) The molding mold includes a first mold for molding the outer surface side of the first disc and a second mold for molding the outer surface side of the second disc, and each of the molds and a third mold that cooperates with to mold the unit blade. Further, the third mold comprises an insertion mold corresponding to the air passage of the blower fan inside a mold base that can be separated from the first mold and the second mold, The insertion mold includes an insertion reciprocating mold that can move in the centripetal direction and radial direction with respect to the rotation axis, and an insertion mold that tilts up and down around a tilting axis provided in the insertion mold to move from the "up" position to the "down" position. It has a structure in which an insertion undulating mold that can move up to 100 degrees is laminated.
(3) After the molding die is closed and the blower fan is molded, the molding die is operated as follows to perform molding.
(a) Closing the first mold, the second mold and the third mold, molding the resin in the molds to mold the blower fan.
(b) Subsequently, the insertion luffing die is held at the molding position, and only the insertion reciprocating die is radially moved from the molding position to a first intermediate position.
(c) Subsequently, when the first intermediate position is reached, the clamping of the insertion luffing mold is released, the insertion luffing mold is rotated around the tilting axis, and the rotating shaft side of the insertion luffing mold is inserted and reciprocated. While gradually tilting toward the mold side, the insertion luffing mold and the insertion reciprocating mold are radially moved to a second intermediate position.
(d) Subsequently, when the second intermediate position is reached, the rotation of the insertion hoisting mold is stopped, or the rotation of the insertion hoisting mold is continued, and the insertion hoisting mold and the insertion reciprocating metal are moved. The mold is moved to the demolding position.
(e) Subsequently, the first mold and the second mold are moved to the demolding position before, after, or at the same time as the movement of the insertion undulating mold and the reciprocating insertion mold to the demolding position. move to
(f) Subsequently, the molded blower fan is removed from the molding die in a state in which the insertion hoisting die, the insertion reciprocating die, the first die and the second die have reached the demolding position. .
(g) Subsequently, the insertion undulating mold, the insertion reciprocating mold, the first mold and the second mold are returned to the molding position.

In the above, "In the unit blade, when the blade has a first virtual chord line on the side of the first disk and a second virtual chord line on the side where the blade contacts the second disk , the "first imaginary chord line" and the "second imaginary chord line" intersect in the rotation axis direction. "" means a state in which the blade is twisted.

In addition, "integrated" in the above means mechanically (physically) pasting together parts molded by multiple molding processes, or additionally secondary molding to a semi-molded product by multiple molding processes. Manufacturing that does not include processes.

The insertion mold for forming the unit blades of the blower fan, which is located in the air passage portion of the resin blower fan scheduled to be molded, has a special structure. That is, the insertion mold that can move in the centripetal radial direction with respect to the rotation axis is configured by stacking the insertion reciprocating mold and the insertion undulating mold so that only the insertion reciprocating mold can move in the radial direction, and The insertion of the hoisting die is rotatable around the tilting axis of the reciprocating die.
Therefore, it is possible to move the reciprocating insertion die in the radial direction and at the same time incline the insertion luffing die. Therefore, a blower fan having twisted unit blades, which could not be integrally molded in the past, can now be integrally molded with a simple mold structure.

1 is a perspective view of a blower fan manufactured by practicing the present invention; FIG. 1(a) is a plan view of a blower fan manufactured by implementing the present invention, and FIG. 1(b) is an enlarged plan view schematically explaining the structure of a unit blade; FIG. FIG. 3(a) is a front view and FIG. 3(b) is a sectional view taken along the line AA of FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is an insertion die used for implementation of this invention, (a) is a top view showing a molding state, (b) is a front view showing a molding state. (a) to (f) are front views for explaining the operation of the insertion mold used for carrying out the present invention. FIG. 2 is a plan view showing a molding state (closed state) in the placement of the insertion mold according to the embodiment of the present invention; FIG. 3 is a perspective view showing the placement of the insertion mold according to the embodiment of the invention, similarly in a molding state (closed state). FIG. 4 is a plan view showing the disposition of the insertion mold according to the embodiment of the present invention, showing a demolding state (open state). FIG. 4 is a perspective view showing the disposition of the insertion mold according to the embodiment of the present invention, showing a demolding state (open state); FIG. 4 is a plan view of another blower fan manufactured by implementing the present invention; Fig. 10 shows a drawing in which an insertion mold is omitted in another embodiment (using a connecting annular member) of the present invention, (a) being a molded state, and (b) being a perspective view of a demolded state. Similarly, another embodiment of the present invention (using a connecting annular member) shows an insertion mold, in which (a) is a demolded state and (b) is a perspective view of a molded state. FIG. 10 is a perspective view of another embodiment of the present invention (using a connecting annular member) with a part thereof cut (the insertion mold is omitted), and is a perspective view in the middle of demolding.

1. Structure of blower fan 1 to be molded

(1) The blower fan 1 molded by the mold of the present invention rotates around a rotating shaft 3, and a large number (here, seven blades) of unit blades 30, 30 are arranged radially around the rotating shaft 3. The blade group is sandwiched between the inner surface 11 of the first disc 10 and the inner surface 21 of the second disc (with the central opening 28) 20, which share the rotating shaft 3 (Figs. 1 and 2). (a)). In addition, the portions surrounded by the side surfaces 34, 35 of the adjacent unit blades 30, 30, the inner surface 11 of the first disc 10, and the inner surface 21 of the second disc 20 constitute the air passages 5, 5. 5, 5 communicate with the central opening 28 of the second disc 20 (Figs. 1 and 2(a)).

(2) The first circular plate 10 has an outer peripheral flat surface 13 having a flat outer peripheral side (a plane perpendicular to the rotating shaft 3) in a predetermined range from the outer periphery 12 toward the center (rotating shaft 3). A center bulging portion 14 is formed which has a shaft hole 15 through which the shaft 3 is inserted and protrudes toward the second disc 20 (FIGS. 1, 2(a) and 3(b)).
The central bulging portion 14 is shaped like a gently curved mountain whose top is the shaft hole 15 (rotating shaft 3 ) and is rotationally symmetrical about the rotating shaft 3 . Also, the central bulging portion 14 is formed with an outer diameter that is approximately “three-fifths” of the radius of the first disc 10 . Therefore, in the radial direction, from the outer periphery 12 toward the shaft hole 15, the outer peripheral flat portion 13 continues for about "two-fifths", and continues gently without a boundary to reach the central bulging portion 14 ( 1, 2(a) and 3(b).
The opposite side of the inner surface 11 of the first disc 10 is defined as an outer surface 11a.

(3) The second disc 20 is concentric with the first disc 10 and has the same outer diameter, and has a central opening 28 extending radially from the center (position of the rotating shaft 3) to about "4/5". is formed, and the second disk 20 has a ring shape extending radially from the outer circumference 22 to about "1/5". The outer peripheral inclined portion 23 was gradually bent in the direction away from the first disc 10 following the flat outermost peripheral flat surface 24 (parallel to the outer peripheral flat surface 13 of the first disc 10) on the outermost periphery of the outer periphery 22. A rib-shaped inner peripheral edge 26 is formed at a position farthest from the first disc 10 following the inclined surface 25 . The inclined surface 25 is formed by gradually bending in a stepped concentric circle in a direction away from the first disc 10 (FIGS. 1, 2(a), 3(a) and 3(b)).
The opposite side of the inner surface 21 of the second disc 20 is defined as an outer surface 21a.

(4) The blade group is configured by arranging seven unit blades 30 around the rotating shaft 3 . Each unit blade 30, 30 is formed as follows.

(4) (a) The unit blade 30 is on the side of the first disk 10, and the contact surface with the first disk 10, that is, the first disk contact surface 37 is located on the outer peripheral flat surface 13 of the first disk 10. do.
The unit blades 30 are arranged in the radial direction with a slight angle from the radius, and the outer peripheral edge 31 is located near or coincident with the outer circumference 12 of the first disc 10 (that is, near or coincident with the outer circumference 22 of the second disc 20). ), and the inner peripheral end 32 near the rotating shaft 3 is also located on the outer peripheral flat surface 13 (FIGS. 1 and 2(a)).
On the first disc ground contact surface 37, the unit blade 30 has a slightly thick intermediate portion and gradually tapered ends. 38, and when the unit blade 30 is viewed in the rotation axis direction with respect to the first virtual chord 38, its side surfaces have a bent cross-sectional shape such that one side is a convex side 34 and the other side is a concave side 35 (FIG. 2). (a)(b)).
On the first disc ground contact surface 37, the first virtual chord 38 (on the inner peripheral end 32 side) in the radial direction from the outer peripheral end 31 is arranged at an angle of about 40° (30° to 60°) with respect to the radius. (Fig. 2(b).

(4) (b) The unit blade 30 has this cross-sectional shape, and the thickness gradually decreases from the first disc 10 (first disc contact surface 37) toward the second disc 20. created.

(4) (c) The end surface of the unit blade 30 on the side of the second disk 20 is in contact with the outer peripheral inclined portion 23 , but the central opening 28 forms an exposed portion 44 . The outer peripheral inclined portion 23 is defined as a second disc contact surface 41 including the contact portion and the end surface of the exposed portion 44 on the side of the second disc 20 .
Therefore, even in the second disk contact surface 41, the unit blade 30 has a slightly thick middle portion and gradually narrows both ends. A virtual chord 42 is used, and when the unit blade 30 is viewed in the rotation axis direction with respect to the second virtual chord 42, one side surface of the unit blade 30 has a bent cross-sectional shape such that one side is a convex side surface 34 and the other side is a concave side surface 35 ( 1, 2 and 3).
Similarly, the outer peripheral end 31 of the unit blade 30 is positioned on the outer periphery 22 of the second disc 20 on the side of the second disc 20 (FIGS. 1 and 2(a)).

(4) (d) The first virtual string 38 and the second virtual string 42 are twisted so as to intersect at the middle position of both strings, and the first virtual string 38 and the second virtual string 42 are twisted in the direction of the rotation axis 3. 42 is formed at an angle of approximately 15° (approximately 10 to 30°) (FIG. 2(b)).
Therefore, the unit blades 30, 30 are arranged obliquely to the outer peripheral flat surface 13 of the first disk 10 on the outer peripheral side, rather than at right angles.

(4) (e) A straight line P connecting the outer peripheral end 31 of one unit blade 30 and the center (rotating shaft 3) on the first disc ground contact surface 37 is the inner peripheral end 32 of one adjacent unit blade 30. It is arranged so as to pass through the vicinity (Fig. 2(a)).

2. Mold structure

(1) The molding die includes a first die (not shown), a second die (not shown), and a third die including a die base 50 with insertion dies 60, 60. , and these control mechanisms. The control mechanism is a mechanism for mechanically and electrically controlling a mechanism for holding the first mold, the second mold, and the third mold and the operation thereof. The first mold and the second mold are separated from each other in the direction of the rotating shaft 3 of the blower fan 1 to be molded, a molding position (closed position) for closing and molding, and a demolding position (closed position) for removing the molded blower fan 1. open position). The insertion mold 60 forms the air passages 5 provided in the blower fan 1, and the number corresponding to the number of the air passages 5 (=the number of the unit blades 30) is arranged around the rotating shaft 3. can take a molding position (closed position) on the centripetal side with respect to the rotary shaft 3 and a demolding position (open position) on the radial side.

(2) The first mold is configured to mold the outer surface 11a of the first disk 10 of the blower fan 1, the peripheral surface of the outer periphery 12, and the shaft hole 15 (Figs. 1, 2(a), FIG. 3(b)).
The second mold includes the outer surface 21a of the second disk 20 of the blower fan 1, the peripheral surface of the outer periphery 22, the inner peripheral surface of the outer peripheral inclined portion 23, the exposed portion 44 exposed at the central opening 28 of the unit blade 30, the first The inner surface 11 of the disc 10 is configured to form the vicinity of the central swelling portion 14 (FIGS. 1, 2(a), 3(a) and 3(b)).
The insertion mold 60 is inserted between the unit blades 30, 30 to be molded (inside the air duct 5), and the two side surfaces 34, 35 of the unit blade 30, the inner surface 11 of the first disk 10 near the outer peripheral flat surface 13, The inner surface 21 of the second disk 20 is configured to form the vicinity of the outer peripheral inclined portion 23 (FIGS. 1, 2(a) and 3(b)).

(3) The insertion mold 60 has a structure in which the lamination surface 64 of the reciprocating insertion mold 62 and the lamination surface 74 of the insertion undulating mold 72 are aligned and laminated to hold them. It also includes a holding mechanism with a U-shaped cross section (Fig. 4). In addition, the reciprocating insertion mold 62 and the insertion undulating mold 72 are arranged in a state in which the stacking surfaces 64 and 74 are in close contact with each other in the reciprocating movement direction of the insertion reciprocating mold 62 (toward the rotating shaft 3 of the blower fan 1 to be molded). On the other hand, smooth relative movement is possible along the direction of reciprocating movement from the centripetal side to the radial side (the directions of arrows 81 and 82 in FIG. 4).
Therefore, when the insertion die 60 is in the molding position, the insertion reciprocating die 62 and the insertion undulating die 72 are integrated with their tip ends 63, 73 side (rotating shaft 3 side of the blower fan) aligned (FIG. 4). , the first mold and the second mold cooperate to mold the blower fan 1 . The reciprocating insertion die 62 molds the inner surface 21 side of the second disc 20, the insertion undulating die 72 shapes the inner surface 11 side of the first disc 10, and both sides 66, 66 of the reciprocating insertion die 62 and both side surfaces 76, 76 of the insertion hoisting mold 72 are structured so that the unit blade 30 can be formed.

(4) The reciprocating insertion die 62 is mounted sandwiched between the guide members 52 along the sliding surface 53 of the die base 50. ) is placed on the sliding surface 53 of the mold base 50 so that it can move smoothly in the centripetal and radial directions (FIG. 4).
Further, the reciprocating insertion die 62 is operated by a hydraulic cylinder 57 attached to the die base 50 . That is, the tip of the piston 58 of the hydraulic cylinder 57, which directs the piston 58 in the radial direction (that is, the moving direction of the insertion mold 60), is attached to the projection 69 on the other surface 63a side of the insertion reciprocating mold 62. . The reciprocating insertion die 62 is controlled to move along with the reciprocating motion of the piston 58 (FIG. 4). One hydraulic cylinder 57 is arranged for one reciprocating insertion die (insertion die).

(5) In addition, a through hole is formed in the stacking direction (direction of the rotating shaft 3) of the reciprocating insertion mold 62 and the reciprocating insertion mold 72 at an intermediate portion in the moving direction of the reciprocating insertion mold 62 (not shown). ), and an operation member 68 elongated in the direction of the through hole is slidably inserted into the through hole. The operating member 68 slides in its axial direction so that one end 68a can protrude from the stacking surface 64 of the operation reciprocating mold 62, and the other end 68b can be positioned on the other side of the stacking surface 64 of the insertion reciprocating mold 62. It is constructed so that it can protrude from 65 . The axial movement of the operating member 68 is operated by a pressing member 54 formed on the sliding surface 53 of the mold base 50 (FIG. 4).

(6) A tilting shaft 67 is provided at a position on the base end 73 a side of the insertion hoisting mold 72 . is rotatably held (may be pivotally supported). The tilting shaft 67 is perpendicular to the reciprocating direction of the reciprocating insertion die 62 (that is, the direction in which the reciprocating insertion die 72 and the reciprocating insertion die 62 are in close contact with each other on the stacking surfaces 74, 64) and rotates. It is arranged in a direction perpendicular to the axial direction of the shaft 3 as well.
Further, the tilting shaft 67 of the insertion hoisting die 72 is formed so that the insertion hoisting die 72 can rotate about the tilting shaft 67 with respect to the reciprocating insertion die 62 . In other words, the insertion hoisting die 72 has a structure in which the tip 73 side (rotation shaft 3 side of the blower fan 1) can hoist about the tilting shaft 67 (FIG. 4).

(7) In addition, on the laminating surface 74 of the insertion undulating mold 72, a concave portion facing the other surface 75 on the opposite side of the laminating surface 74 is formed (the opening of the concave portion faces the laminating surface 74). An operation flat surface 77 is formed from the intermediate portion of the concave portion toward the base end side in the reciprocating direction of the mold 72 (insertion reciprocating mold 62) to a point beyond the tilting shaft 67 at the molding position. An operation concave surface 78 is formed on the side of the proximal end 73 a of the insertion hoisting die 72 continuously from the 77 . The operation concave surface 78 is a partially circular concave curved surface, and extends at an angle (approximately 60° to 90°) perpendicular to the lamination surface 74 on the base end 73a side (near the lamination surface 74) of the insertion hoisting mold 72. , the vicinity of the lamination surface 74 is a proximal end 78a of the operation concave surface 78 (FIG. 4(b)).

(8) In addition, the position of the tip 63 of the reciprocating insertion mold 62 at the molding position (on the side of the rotation shaft 3 of the blower fan 1 to be molded) is set to "zero", and the tip of the reciprocating insertion mold 62 moved from this position. Let L be the distance in the 63 radial direction. In addition, the inclination of the insertion luffing die 72 at the molding position is set to "zero" (substantially parallel to the stacking surface 74 in FIG. 5), and the inclination of the insertion luffing die 72 from the position is θ (FIG. 5).

3. Molding of blower fan 1

(1) The blower fan 1 molded in this embodiment is, for example,
Outer diameter D of blower fan 1 = 460 mm,
Maximum height of blower fan 1 H = 130mm
(Fig. 2(a), Fig. 3(a)). The maximum height D is the length from the outer surface 11a of the first disc 10 to the edge of the inner circumference 21 of the second disc 20 (the position furthest from the first disc 10 at the outer peripheral inclined portion 23). Say.

(2) Operate the control mechanism (not shown) to bring it into the following state. That is, on the mold base 50 of the third mold, the insertion molds 60, 60 are positioned in the centripetal direction closest to the rotation axis 3, and in this state, the tip 63 of each insertion reciprocating mold 62 and the insertion undulation. A molding position (centripetal position) is set in which the tips 73 of the molds 72 are aligned (FIGS. 5A and 4). In addition, the first mold and the second mold also approach the insertion molds 60 and 6 (the mold base 50 and the third mold), close to each other, and are in the molding position. In this state, the blower fan 1 is molded by injecting resin into the molding die.

(3) The operation (operation of the control mechanism) for moving the insertion mold 60 to the demolding position after completion of molding will be described in (a) to (f).

(3) (a) Molding position Fig. 5 (a) L0 = 0, θ0 = 0°
At the molding position where the insertion mold 60 is closest to the rotating shaft 3, the molded blower fan 1 has the central bulging portion 14 formed on the first disk 10 and the outer peripheral inclined portion on the second disk 20. 23 is formed, and the unit blades 30, 30 are twisted in shape and arrangement. Therefore, even if the insertion die 60 is moved radially as it is, the insertion die 60 will be separated from the air passage 5 of the molded blower fan 1. cannot be removed.
Prior to the operations of (b) to (f) below or at the same time as the operations of (b) to (f), for the third mold (mold base 50, insertion mold 60, 60), Open the first and second molds (not shown).

(3) (b) First movement position (first intermediate position) Fig. 5 (b) L1, θ1 = 0°
When the molding of the fan 1 is completed, the hydraulic cylinder 57 is operated to extend the piston 58 in the direction of arrow 83 to move the reciprocating insertion die 62 radially (in the direction of arrow 81) (Fig. 5 ( a) to FIG. 5(b)).
At this time, the operating member 68 of the reciprocating insertion die 62 moves together with the reciprocating insertion die 62, and the other end 68b of the operating member 68 is pressed against the sliding surface 53 of the die base 50 (not shown). ), and one end 68a of the operating member 68 is located near the operating flat surface 77 in the reciprocating direction, and the one end 68a of the operating member 68 does not protrude from the stacking surface 64. , or even if it protrudes, it is controlled so that it does not come into contact with the operation flat surface 77 of the insertion hoisting die 72 and is slightly separated. Therefore, the insertion hoisting mold 72 is not interlocked with the operation member 68 (insertion reciprocating mold 62), and the vicinity of the tip 72 of the insertion hoisting mold 72 hangs on the molded blower fan 1, and is in the molding position. It stays and does not tilt or move.
Therefore, by operating the hydraulic cylinder 57 in the direction of arrow 83, only the reciprocating insertion die 62 moves radially (in the direction of arrow 81) to L1 (FIG. 4).
L1=100mm

(3) (c) Second movement position Fig. 5 (c) L2, θ2
Subsequently, the hydraulic cylinder 57 is operated to move the piston 58 in the direction of the arrow 83 (Fig. 4), and the tip of the reciprocating insertion die 62 moves radially (in the direction of the arrow 81) from L1 to L2. (FIGS. 5(b) to 5(c)).
L2=110mm
At this time, when the tip of the reciprocating insertion die 62 passes through L1, the other end 68b of the operating member 68 moving together with the reciprocating insertion die 62 hits the pressing member (not shown) of the sliding surface 53. As a result, the pressing member moves the operating member 68 slightly toward the one end 68 a in the axial direction, and the one end 68 a of the operating member 68 contacts the concave operating surface 78 of the insertion hoisting die 72 . Furthermore, one end 68a of the operation member 68 riding on the pressing member continues to press the operation concave surface 78 as the insertion reciprocating mold 62 moves, and the insertion undulation is pushed along the operation concave surface 78 by being pushed by the one end 68a of the operation member 68. The die 72 rotates around the tilting shaft 67 to tilt the tip 73 of the insertion hoisting die 72 up to θ2.
θ2=3°
Therefore, since one end 68a of the operation member 68 presses the operation concave surface 78, the insertion hoisting mold 72 is pulled by the operation member 68 and moves together with the insertion reciprocating mold 62 to the second movement position.

(3) (d) Third movement position Fig. 5 (d) L3, θ3
Subsequently, the hydraulic cylinder 57 is operated in the direction of arrow 83, and the tip 63 of the reciprocating insertion mold 62 moves radially (in the direction of arrow 81) from L2 to slightly L3 (from FIG. 5(c) to FIG. 5). (d)).
L3=130mm
At this time, the pressing member continues to press the other end 68 b of the operating member 68 , and the leading end 68 a of the operating member 68 moving together with the insertion reciprocating die 62 continues to press the operating concave surface 78 of the insertion luffing die 62 . Therefore, the insertion hoisting die 72 is further rotated around the tilting shaft 67 to tilt the tip 73 of the insertion hoisting die 62 up to .theta.3.
θ3=7°
Therefore, since the one end 68a of the operating member 68 presses the operating concave surface 78, the insertion hoisting die 62 moves together with the insertion reciprocating die 62 to the third movement position while being pulled by the operating member 68. FIG.

(3) (e) Fourth movement position (second intermediate position) Fig. 5 (e) L4, θ4
Subsequently, the hydraulic cylinder 57 is operated to move the piston 58 in the direction of the arrow 83, and the tip 63 of the reciprocating insertion die 62 moves radially (in the direction of the arrow 81) from L3 to L4 slightly (Fig. 5 ( d) to FIG. 5(e)).
L4=150mm
At this time, the pressing member continues to press the other end 68 b of the operating member 68 , and the leading end 68 a of the operating member 68 moving together with the insertion reciprocating die 62 continues to press the operating concave surface 78 of the insertion hoisting die 72 . , the insertion hoisting die 72 is further rotated about the tilting axis, and the tip 72 of the insertion hoisting die 72 is tilted up to .theta.4.
θ4=12°
Therefore, since one end 68a of the operating member 68 presses the operating concave surface 78, the insertion hoisting die 72 moves together with the insertion reciprocating die 62 to the fourth moving position while being pulled by the operating member 68. FIG.

(3) (f) Demolding position Fig. 5 (f) L5, θ5
When the fourth movement position (FIG. 5(e)) is reached, the front end 73 side of the insertion hoisting mold 72 is released from engagement with the molded blower fan 1 . Further, when the fourth movement position (FIG. 5(e)) is reached, one end 68a of the operation member 68 of the insertion reciprocating mold 62 is positioned at the base end 78a of the operation concave surface 78 of the insertion hoisting mold 62, and the operation is performed. The member 68 is engaged with the proximal end 78a of the operation concave surface 78, and is in a state in which it is not possible to push the insertion hoisting die 72 so as to tilt it any further. Therefore,
θ4=θ5=12°
is.
Therefore, the hydraulic cylinder 57 continues to operate and the piston 58 moves in the direction of the arrow 83, and the insertion reciprocating die 62 and the insertion luffing die 62 and the insertion luffing die 62 continue to move until the tip 63 of the insertion reciprocating die 62 reaches from L4 to L5. The die 72 moves radially (in the direction of arrow 83) at the same time. At this time, the hoisting motion of the insertion hoisting mold 72 is not performed, and the hoisting angle at the fourth movement position is maintained.
L5=215mm
At the stage of L5, the insertion mold 60 (insertion reciprocating mold 62 and insertion undulating mold 72) escapes from the air passage 5 of the molded blower fan 1, and therefore the tip of the insertion mold 50 ( The tip 63 of the insertion reciprocating die 62 and the tip 73 of the insertion luffing die 72) are radially positioned relative to the outer circumference 12 of the first disk 10 and the outer circumference 22 of the second disk 20 .

(4) While the insertion mold 60 is in the demolding position (FIG. 5(f)), the first mold and the second mold are opened around this time or at the same time so that the mold is demolded. It's becoming Therefore, the blower fan 1 is removed from the mold (demolded).
A series of movements of the insertion reciprocating mold 62 and the insertion undulating mold 72 from the molding position (FIG. 5(a)) to the demolding position (FIG. 5(f)) is the operation of driving out the piston 58 of the hydraulic cylinder 57. (In the direction of arrow 83. FIG. 4(b)), it proceeds smoothly.

(5) Subsequently, when the molded blower fan 1 is taken out from the molding die, the cylinder 57 is reversely operated for the next molding operation, and the piston 58 is pulled (moved in the direction of arrow 84). 4), the insertion mold 50 is moved in the direction of arrow 82 from the demolding position (FIGS. 5(f), 8, 9) to the molding position (FIG. 5(a), FIG. 6, Figure 7)). Before, after, or at the same time as this, the first mold and the second mold also return to the molding position (not shown).

(6) In addition, the structure for moving the insertion mold 50 (including the stacking surfaces 64 and 74, the tilting shaft 67, the operation flat surface 77, the operation concave surface 78, the insertion operation member 68, etc.) and the mold base 50 are moved. A structure, a structure for moving the cylinder 57, a structure for moving the first mold and the second mold, software for operating these, and the like constitute a control mechanism.

3. Other embodiment

(1) In the blower fan 1 to be formed in the above-described embodiment, the vicinity of the inner peripheral end 32 of the unit blade 30 and the inner surface 11 (outer peripheral flat portion 13) of the first disk 10 in the air passage 5 , and near the inner peripheral end 32 of the unit blade 30 of the central bulging portion 14, the shape that bulges toward the second disk side (center opening 28 side) and fills in the step to make it smooth. It is also possible to form the air passage smoothing portion 6 (FIG. 10). In this case, corresponding to the air blow leveling unit 6, the shape of the inserting reciprocating mold 62 of the inserting mold 60 and the tip 63, 73 side of the inserting undulating mold 72, and the shape of the first mold are configured ( not shown).

(2) In the above embodiment, in the configuration of the molded blower fan 1, if the unit blades 20 are twisted, the number of the unit blades 20, the bending of the unit blades 20 in the three directions of the rotation axis, The bending of the unit blades 20 alone in the direction perpendicular to the direction of the rotating shaft 3 is optional (not shown). In addition, the configuration of the first disc 10 and the second disc 20 is arbitrary, such as radial unevenness is formed on the first disc 10 and the second disc 20, and other conventional structures may be adopted. (not shown).
In addition, the inner peripheral end 32 of the adjacent unit blade 30 may be separated from the straight line P, or the unit blade 30 may intersect the straight line P ( not shown).

(3) In addition, in the control of the insertion die 50 of the above embodiment, after passing through the fourth moving position (second intermediate position), the inclination of the insertion hoisting die 72 is fixed, and the mold is removed. moved to position. However, depending on the structure of the blower fan 1 to be molded, the insertion luffing mold 72 and the insertion reciprocating mold 62 are moved radially (arrow 83 direction) to the demolding position (not shown).

(4) In addition, in the above embodiment, in controlling the insertion mold 50, the connecting annular member is used to make the centripetal and radial reciprocating motions of each insertion mold 62 (insertion mold 60) smoother. 90 may also be provided (FIGS. 11-13).
The connecting annular member 90 (concave in cross section) has a perfect circular groove 91 formed on one surface thereof, and both the inner and outer peripheral edges of the perfect circular groove 91 are formed in perfect circles. The central axis of the circular groove 91 is formed concentrically with the center of the reciprocating insertion molds 62, 62, that is, with the rotating shaft 3 of the blower fan 1 to be molded. A connecting disc (connecting annular member) 92 is fitted in the circular groove 91 in the circumferential direction so that the connecting disc 92 can move smoothly in the circular groove 91 . . Therefore, the inner peripheral edge and the outer peripheral circle of the connecting disc 92 are also perfect circles, and the axis of the connecting disc 92 is also formed concentrically with the rotating shaft 3 of the blower fan 1 to be molded. The connecting annular member 90 is arranged and attached within the mold base 50 .
In addition, link rods 94 corresponding to the number of reciprocating insertion dies 62 are prepared, and one end of each link rod 94 is evenly arranged at one point on the connecting disk 92 and connected to support a shaft (rotational support). freely), and the other end of each link rod 94 is connected and pivotally supported (rotatably) to the projection 69 on the other surface 65 and the other surface 63a of each corresponding insertion reciprocating mold 62 . Therefore, since the piston 58 of the hydraulic cylinder 57 is connected to the convex portion 69, the pistons 58, 58 slide all at once (simultaneously), and at the same time, the connecting disc 92 smoothly rotates within the perfect circular groove 91. . Therefore, the reciprocating insertion die 62 moves in the centripetal radial direction in response to the reciprocating motion of the piston 58, and is guided by the smooth rotation of the connecting disk 92 within the perfect circular groove 91. A smooth reciprocating motion of the mold 62 is guided.
The connecting annular member 90, the connecting disk (connecting annular member) 92, and the link rod 94 are arranged in the gap 89 between the other surface 65 of the reciprocating insertion die 62 and the hydraulic cylinder 57 and the piston 58 (Fig. 4 (b)), and does not interfere with the first mold (not shown), the second mold (not shown) and the third mold (insertion mold 60), and naturally the blower fan 4(b), the connecting ring member 90, the connecting disc (connecting ring member) 92, and the link rod 94 are arranged in the gap 89. , and does not necessarily correspond to the actual dimensions.
In addition, it is preferable that the connecting ring member 90 is formed to be slightly larger than the outer diameter D of the blower fan 1 to be molded. For example, when the outer diameter D is 460 mm as described above, the diameter of the circular groove of the connecting annular member 90, that is, the diameter of the connecting disk 92 is formed to be approximately 570 mm.

(5) In the case of (4) above, the insertion mold 60 and other molds are closed to form the blower fan 1 (FIGS. 11(a) and 12(b)). ), the insertion reciprocating die 62 and the insertion undulating die 72 are removed from the air passage 5 of the fan 1 (FIGS. 11(b) and 12(a)) by the same control, and the fan 1 is taken out (FIG. 1 to Figure 3).
11 and 12, the upper side faces upward (that is, the central axis of the circular groove 91 and the central axis 3 of the blower fan 1 are arranged horizontally). , The load on the hydraulic cylinder 57 and the piston 58 is different between the upper and lower sides, but the different loads are absorbed by the operation of the connecting ring member 90, the connecting disc (connecting ring member) 92, and the link rod 94, Centripetal radial movement of the insert mold 60 can be performed more smoothly.

(6) In the cases of (4) and (5) above, the connecting disk 92 to which the link rod 94 is connected is fitted into the circular groove 91 of the connecting annular member 90 attached to the mold base 50, but the circular motion If the link rod 94 is attached to a connecting annular member that can For example, the link rod 94 may be attached to the connecting annular member 90, and the connecting disc 92 fitted in the circular groove 91 of the connecting annular member 90 may be attached to the die base 50 (not shown).

1 Blower fan 3 Blower fan rotating shaft 5 Blower fan air passage 6 Blower passage leveling portion 10 Blower fan first disc 11 First disc inner surface 11a First disc outer surface 12 First circle Outer circumference 13 of the plate Outer circumference flat portion 14 of the first disk Outer circumference flat surface 15 of the first disk Shaft hole 20 of the first disk Second disk 21 of the blower fan Inner surface 21a of the second disk Outer surface 22 Outer circumference 23 of the second disk Outer circumference inclined part 24 of the second disk Outermost flat part 25 of the outer circumference inclined part of the second disk Inclined surface 26 of the outer circumference inclined part of the second disk Outer circumference of the second disk Inner peripheral edge 28 of inclined portion Central opening 30 of second disk Unit blade 31 of blower fan Outer peripheral edge 32 of unit blade Inner peripheral edge 34 Convex side 35 of unit blade Concave side 37 of unit blade First of unit blade Disc grounding surface 38 First virtual chord 41 of unit blade Second disc grounding surface 42 of unit blade Second virtual chord 44 of unit blade Exposed portion 50 of unit blade Mold base 52 Guide member 53 of mold base Mold base sliding surface 57 Mold base hydraulic cylinder 58 Mold base hydraulic cylinder piston 60 Insertion mold 62 Insertion mold reciprocating mold 63 Insertion reciprocating mold tip 63a Insertion reciprocating metal Base end 64 of mold Stacking surface 65 of reciprocating insertion mold Other surface 66 of reciprocating insertion mold Side face 67 of reciprocating insertion mold Tilting shaft 68 of reciprocating insertion mold Operation member 68a of reciprocation insertion mold One end 68b of operation member Operation The other end 69 of the member Projection 72 on the side of the other surface 65 of the reciprocating insertion die Inserting and luffing die 73 of the insertion die Tip end 73a of the insertion and luffing die Base end 74 of the die for insertion and luffing Lamination surface 75 of the die for insertion and luffing Other surface of insertion luffing die 76 Side surface of insertion luffing die 77 Operation flat surface of insertion luffing die 78 Operation concave surface of insertion luffing die 89 Gap 90 Cylinder connecting member 91 Circular groove 92 of cylinder connecting member Connecting ring 94 Link rod

Claims (5)

A blade group in which a large number of twisted unit blades are rotationally symmetrically arranged around a rotation axis, and is sandwiched between a first disk and a second disk centered on the rotation axis. A mold for integrally molding a blower fan, and a mold for a blower fan having twisted blades, characterized in that it is configured as follows.
(1) The unit blade of the blower fan has an outer edge on the radial side positioned near the outer circumference of the first disk and the second disk, and an inner edge on the rotating shaft side of the unit blade extending from the rotating shaft. It was formed obliquely with respect to the radial direction and the outer peripheral direction of each disk.
(2) The molding die comprises a first die for molding the outer surface side of the first disc and a second die for shaping the outer surface side of the second disc, and each of the dies and a third mold for forming the blades in cooperation with, and a control mechanism for controlling these operations.
Further, the third mold comprises an insertion mold corresponding to the air passage of the blower fan inside a mold base that can be separated from the first mold and the second mold, The insertion mold includes an insertion reciprocating mold that can move in the centripetal direction and radial direction with respect to the rotation axis, and an insertion undulating mold that tilts up and down around the tilting axis to move from the "up" position to the "down" position. A structure in which the mold is laminated.
(3) The control mechanism is configured so that the first mold, the second mold and the third mold can take a closed "molding position" and an open "mold removing position". .
Furthermore, the control mechanism has a "molding position" where the insertion mold of the third mold approaches the rotating shaft for molding, and a "molding position" located radially from the outer periphery of the first disk and the second disk. and the insertion mold is configured to be movable between the molding position and the demolding position.
(4) The control mechanism causes the insertion luffing die to remain at the molding position, moves only the insertion reciprocating die to a predetermined position in the radial direction, and then gradually moves the insertion luffing die toward the center side to the insertion reciprocating die. The insertion reciprocating mold is configured to move in the radial direction at the same time as tilting about the tilting axis toward the mold side. A blade group in which a large number of twisted unit blades are rotationally symmetrically arranged around a rotation axis, and is sandwiched between a first disk and a second disk centered on the rotation axis. A mold for integrally molding a blower fan, and a mold for a blower fan having twisted blades, characterized in that it is configured as follows.
(1) The unit blade of the blower fan has an outer edge on the radiation side located near the outer circumference of the first disk and the second disk, and an inner edge on the rotating shaft side of the unit blade that extends from the rotating shaft. It was formed obliquely with respect to the radial direction and the outer peripheral direction of each disc.
Furthermore, as a virtual chord line connecting the center-side end and the radial-side end of the unit blade, the unit blade is formed so that the intermediate portion is convex in one direction with respect to the virtual chord line,
In addition, in the unit blade, when the blade has the first virtual chord line on the side of the first disk and the second virtual chord line on the side where the blade contacts the second disk, the above The "first imaginary chord line" and the "second imaginary chord line" were arranged to intersect in the rotation axis direction.
(2) The molding mold includes a first mold for molding the outer surface side of the first disc and a second mold for molding the outer surface side of the second disc, and each of the molds and a third mold for forming the blades in cooperation with, and a control mechanism for controlling these operations.
Further, the third mold comprises an insertion mold corresponding to the air passage of the blower fan inside a mold base that can be separated from the first mold and the second mold, The insertion mold includes an insertion reciprocating mold that can move in the centripetal direction and radial direction with respect to the rotation axis, and an insertion undulating mold that tilts up and down around the tilting axis to move from the "up" position to the "down" position. A structure in which the mold is laminated.
(3) The control mechanism is configured so that the first mold, the second mold and the third mold can take a closed "molding position" and an open "mold removing position". .
Further, the control mechanism has a "molding position" where the insertion mold of the third mold approaches the rotating shaft for molding, and a "molding position" where the insertion mold is located radially from the outer circumferences of the first and second discs. and the insertion mold is movable between the molding position and the demolding position, and following the molding position, there are a first intermediate position, a second intermediate position, and the demolding position. It is configured so that it can be positioned in order with the position.
(4) The control mechanism is arranged such that, from the molding position of the insertion mold to the first intermediate position, the insertion hoisting mold remains at the molding position and only the insertion reciprocating mold moves radially to a predetermined position. Configured. Further, the front control mechanism radially moves the reciprocating insertion die and the insertion luffing die to predetermined positions from the first intermediate position to the second intermediate position of the insertion die, and at the same time moves the insertion luffing die. The mold is configured so that the center side is gradually tilted to a predetermined position toward the insertion reciprocating mold side around the tilting axis. Further, the control mechanism maintains the tilting state of the insertion hoisting mold at a predetermined position from the second intermediate position of the insertion dies to the demolding position, and operates the reciprocating insertion dies and the insertion hoisting dies. configured to move radially. 3. A mold for forming a blower fan having torsion blades according to claim 1 or claim 2, characterized in that it is configured as follows.
(1) An operation member that moves in the direction of the rotation axis is provided in the insertion reciprocating mold, and an operation concave surface is formed in the insertion undulating mold with which one end of the operation member abuts,
(2) The control mechanism is such that the operating member does not press the operating concave surface from the forming position to the first intermediate position, and when the operating member reaches the first intermediate position, one end of the operating member presses the operating concave surface. Then, the insertion and luffing die is controlled to tilt about the tilting axis, and the insertion and luffing die and the insertion and reciprocating die are moved in the radial direction. 4. A mold for forming a blower fan having torsion blades according to claim 1, wherein the mold is configured as follows.
(1) A connecting annular member that can rotate coaxially with the shaft of the blower fan is arranged at a position where it does not interfere with the first, second and third molds.
(2) One point of the connecting annular member and one end of the link rod are axially fixed, and the other end of the link rod and the insertion reciprocating die are axially fixed. A blade group in which a large number of twisted unit blades are rotationally symmetrically arranged around a rotation axis, and is sandwiched between a first disk and a second disk centered on the rotation axis. A molding method for integrally molding a blower fan with a molding die, the molding method for a blower fan having torsion blades characterized by the following configuration.
(1) The unit blade of the blower fan has an outer edge on the radiation side located near the outer circumference of the first disk and the second disk, and an inner edge on the rotating shaft side of the unit blade that extends from the rotating shaft. It was formed obliquely with respect to the radial direction and the outer peripheral direction of each disk.
(2) The molding mold includes a first mold for molding the outer surface side of the first disc and a second mold for molding the outer surface side of the second disc, and each of the molds and a third mold that cooperates with to mold the unit blade.
The third mold includes an insertion mold corresponding to the air passage of the blower fan inside a mold base that can be separated from the first mold and the second mold, and the insertion The mold includes an insertion reciprocating mold that can move in the centripetal direction and radial direction with respect to the rotation axis, and an up-and-down tilting movement around the tilting axis provided in the insertion mold, from the "up" position to the "down" position. It has a structure in which an insertion undulating mold that can be moved is laminated.
(3) After the molding die is closed and the blower fan is molded, the molding die is operated as follows to perform molding.
(a) Closing the first mold, the second mold and the third mold, molding the resin in the molds to mold the blower fan.
(b) Subsequently, the insertion luffing die is held at the molding position, and only the insertion reciprocating die is radially moved from the molding position to a first intermediate position.
(c) Subsequently, when the first intermediate position is reached, the clamping of the insertion luffing mold is released, the insertion luffing mold is rotated around the tilting axis, and the rotating shaft side of the insertion luffing mold is inserted and reciprocated. While gradually tilting toward the mold side, the insertion luffing mold and the insertion reciprocating mold are radially moved to a second intermediate position.
(d) Subsequently, when the second intermediate position is reached, the rotation of the insertion hoisting mold is stopped, or the rotation of the insertion hoisting mold is continued, and the insertion hoisting mold and the insertion reciprocating metal are moved. The mold is moved to the demolding position.
(e) moving the first mold and the second mold to the demolding position before, after, or at the same time as moving the insertion hoisting mold and the reciprocating insertion mold to the demolding position; .
(f) removing the molded blower fan from the molding die in a state where the insertion hoisting die, the reciprocating insertion die, the first die and the second die have reached the demolding position;
(g) Subsequently, the insertion undulating mold, the insertion reciprocating mold, the first mold and the second mold are returned to the molding position.

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