JP3086343B2 - Manufacturing method of fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a fan. This manufacturing method can be applied to, for example, a cooling fan that cools an engine of a vehicle.

[0002]

2. Description of the Related Art When a resin is loaded into a molding cavity of a molding die to produce a fan, if the gate balance of the molding die changes, the balance of the fan as a molded product changes. This causes vibration and noise when the fan is driven. Therefore, in order to correct the imbalance of the fan, a method of adjusting the thickness of a blade constituting the fan has been known.

Further, US Pat. No. 4,107,257 discloses an insert having a proper number of balance pins and a mold having a molding cavity. Discloses a method of partially adjusting the thickness of the resin in the resin boss portion of the fan by adjusting the protrusion amount of the resin to partially increase or decrease the amount of the resin, thereby preventing imbalance of the fan. Have been.

[0004]

The above-mentioned U.S. Pat.
In the manufacturing method according to No. 07257, in order to prevent imbalance of the fan, the amount of resin is partially increased or decreased by adjusting the amount of protrusion of the balance pin. Variation, not stable. Also, in the above-described method of adjusting the blade thickness, the weight of the fan and the amount of resin consumed vary.

[0005] The present invention has been made in view of the above circumstances, and is different from the method using a balance pin.
An object of the present invention is to provide a method of manufacturing a fan that can reduce or eliminate imbalance and that is advantageous in avoiding the problem of variation in weight and variation in resin consumption.

[0006]

According to the present invention, there is provided a method of manufacturing a fan, comprising: a molding die having a molding cavity for molding the fan; a ring-shaped regulating surface extending in a ring shape facing the molding cavity; A plurality of protrusions or a plurality of protrusions provided on the base at predetermined intervals along an imaginary circle having a second center axis eccentric with respect to the center axis of the base addressed to the shape control surface and the position of which is controlled. Using an eccentric body having a concave mass adjustment part, the base of the eccentric body is installed on the ring-shaped regulating surface of the molding die, and the eccentric body is moved around its periphery according to the imbalance of the fan to be molded. It is characterized by sequentially performing an adjustment step of adjusting the balance by adjusting the position in the direction, and a molding step of loading the molding material into the molding cavity of the molding die to mold the fan and removing the eccentric body from the fan. Is to be

[0007] The eccentric body used in the method of the present invention comprises: a base portion which is addressed to the ring-shaped regulating surface of the molding die and whose position is regulated;
A plurality of convex or concave mass adjustment portions provided on the base at predetermined intervals along an imaginary circle having a second center axis eccentric to the center axis of the base. The base can be ring-shaped or disc-shaped.

[0008]

According to the present invention, if the eccentric body fitted on the ring-shaped regulating surface of the molding die is adjusted in the circumferential direction in accordance with the imbalance of the fan to be molded, the position of the mass adjusting portion of the eccentric body is shifted. The adjustment is made in the circumferential direction of the core, whereby the imbalance of the fan is reduced or avoided.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a molding die 1 used in the method of manufacturing a fan according to the present embodiment. As shown in FIG.
The molding die 1 includes a first die 10 and a second die 12 made of metal. The first mold 10 and the second mold 12 define a molding cavity 14 for molding a fan. That is, as can be understood from FIG. 3, the molding cavity 14 is for molding the boss portion 60 of the fan and the blade 61 functioning as a blade. Therefore, the molding cavity 14
A boss cavity 16 having a ring shape for forming the boss 60 of the fan is provided.

As shown in FIG. 1, the first mold 10 has a circular projection 17 and a ring cavity 18 formed coaxially with the boss cavity 16. The projecting portion 17 and the boss portion cavity 16 are respectively formed around the central axis T. The ring cavity 18 has a ring-shaped bottom surface 18a, a ring-shaped inner peripheral wall surface 18b that functions as a ring-shaped regulating surface, and a ring-shaped outer peripheral wall surface 18c that also functions as a ring-shaped regulating surface. Bottom 18
a, the inner peripheral wall surface 18b and the outer peripheral wall surface 18c
Are formed coaxially with the center axis T of the projection 17 as a center.

As shown in FIG. 4, the non-eccentric ring 3 has a ring portion 30 having a shape fitted into the ring cavity 18,
It has a plurality of convex portions 31 and a plurality of holes 32. Convex part 31
Is a virtual circle M centered on the central axis P1 of the ring portion 30.
Are provided integrally with the ring portion 30 at equal intervals. As shown in FIG. 4, the hole 32 has an arc shape, and the ring portions 3 are equally spaced along the virtual circle M.
0 is provided in a penetrating state. The non-eccentric ring 3
The inner diameter of the inner peripheral surface 30c of the ring portion 30 is approximately 110 mm, the outer diameter of the outer peripheral surface 30d is approximately 180 mm, and the thickness is approximately 15 mm.

An eccentric ring 4 as an eccentric body will be described with reference to FIG. As shown in FIG. 6, the eccentric ring 4 as an eccentric body includes a ring portion 40 as a base, a plurality of eccentric convex portions 41 (41a to 41d), and a plurality of eccentric holes 42 (42a). To 42d). The inner diameter, outer diameter and thickness of the ring portion 40 of the eccentric ring 4 are the same as those of the non-eccentric ring 3. Here, the eccentric convex portion 41 is
The ring portion 40 is integrally provided at equal intervals along an imaginary circle N centered on a second center axis P3 eccentric by L with respect to the center axis P1 of zero. Eccentric hole 42
Has an arcuate long hole shape, and is provided in the ring portion 40 along the imaginary circle N at equal intervals between the eccentric convex portions 41 in the ring portion 40. In addition, the eccentric convex part 41 and the eccentric hole 42 function as a mass adjustment part.

As a result of the eccentricity, as shown in FIG. 6, among the plurality of eccentric convex portions 41 formed on the eccentric ring 4, the eccentric convex portion 41a is formed on the inner peripheral surface 40c of the ring portion 40. The eccentric convex portion 41c is close to the outer peripheral surface 40d of the ring portion 40. Further, among the plurality of eccentric holes 42 formed in the eccentric ring 4, the eccentric holes 42a and 42b are close to the inner peripheral surface 40c of the ring portion 40, and the eccentric holes 42c and 42d
Is close to the outer peripheral surface 40d of the ring portion 40. In addition,
The material of the non-eccentric ring 3 and the eccentric ring 4 is a metal, specifically, iron.

Next, a case of molding a fan will be described. First, as shown in FIG. 2, the ring cavity 30 of the non-eccentric ring 3 is inserted into the ring cavity 18 of the first die 10 of the molding die 1.
Fit. At this time, the position of the non-eccentric ring 3 is regulated by the ring-shaped inner peripheral wall surface 18b and the ring-shaped outer peripheral wall surface 18c. In this state, the first mold 10 and the second mold 12 are clamped. Then, the PP resin is loaded into the molding cavity 14 from the gate of the molding die 1 by an injection molding method. The loaded state is shown in FIG. As can be understood from FIG. 3, in the injection molded state, the positioning projection 62 is formed on the boss portion 60 by the hole 32 of the non-eccentric ring 3, and the caulking hole is formed by the convex portion 31 of the non-eccentric ring 3. 63 is formed on the boss 60. This produces a fan.

The injection molding conditions are as follows: the mold temperature of the mold 1 is 30 ° C., the cylinder temperature is 210 ° C., the injection pressure is 50 kg / cm ² , the injection time is 14 seconds, and the curing time is 50 minutes.
Seconds. After the molding, the first mold 10 and the second mold 12 are opened, and the eccentric ring 3 is separated from the fan.

Incidentally, due to a change in the gate balance generated in the molding die 1 or the like, an imbalance may occur in the fan as a molded product. In this case, the eccentric ring 3
Instead, the eccentric ring 4 is used. That is, the ring portion 40 of the eccentric ring 4 is fitted into the ring cavity 18 of the first die 10 of the molding die 1. At this time, the position of the eccentric ring 4 is regulated by the ring-shaped inner peripheral wall surface 18b and the ring-shaped outer peripheral wall surface 18c.

In accordance with the imbalance of the molded fan, the position of the ring portion 40 is adjusted by rotating the ring portion 40 in its circumferential direction, that is, in the direction of the arrow W1 or the direction of the arrow W2 shown in FIG. In this case, the amount and direction of the fan unbalance is measured by an unbalance measuring device, and the amount of rotation of the ring portion 40 is set according to the measurement result. After the adjustment, the first mold 10 and the second mold 12 are clamped, and the resin is charged into the molding cavity 14 from the gate of the molding die 1 by the injection molding method as described above. The conditions of the injection molding are basically the same as in the case where the non-eccentric ring 3 is used.

When the first mold 10 and the second mold 12 are opened after the injection molding, the eccentric ring 4 forms the positioning projections 62 ′ and the caulking holes 63 ′ in the boss portion 60. The fan is molded. The fan manufactured using the eccentric ring 4 in this manner is balanced. Therefore, in the method of the present embodiment, the imbalance of the fan can be reduced or eliminated without adjusting the thickness of the blade 61 of the fan. Therefore, vibration and noise can be prevented when the fan is driven.

Further, in this embodiment, US Pat.
Unlike the manufacturing method according to No. 57, it is not necessary to adjust the protrusion amount of the balance pin. Furthermore, even if the position of the eccentric ring 4 is adjusted by turning it in the circumferential direction, the weight of the boss portion 60 of the resin fan does not vary. Therefore, the problem of variation in weight and variation in resin consumption can be avoided.

In this embodiment, one kind of eccentric ring 4 is used in which the eccentric convex part 41 is eccentric by the dimension L. However, the present invention is not limited to this. A core ring can also be used. In this case, among a plurality of types of eccentric rings, depending on the imbalance of the fan,
Since an eccentric ring having an optimal balance correction function can be selected, it is more advantageous to reduce or eliminate fan imbalance.

The present invention is not limited to the embodiment described above and shown in the drawings. For example, the number of eccentric convex portions 41 and eccentric holes 42 of the eccentric ring 4, the degree of unevenness, and the shape Etc. can be appropriately changed as necessary.
The material of the eccentric ring 4 is not limited to metal, resin, or ceramics.
When the eccentric ring 4 is rotated, a mark indicating the rotational position of the eccentric ring 4 may be formed on the eccentric ring 4.

The fan formed using the non-eccentric ring 3 is referred to as a fan 8A. The fan 8A is mounted on a coupling 72 of a rotating body 71 via a spacer 70 as shown in FIG. Here, the spacer 70 will be described with reference to FIG. The spacer 70 has a center hole 70a, a first mounting hole 76, a second mounting hole 77, and a third mounting hole 78. The first assembling hole 76, the second assembling hole 77, and the third assembling hole 78 are formed by a virtual line K around the central axis P5.
It is arranged along.

When the fan 8A is mounted on the rotating body 71, the first mounting hole 76 of the spacer 70 and the rotating body 71
10A, the position of the spacer 70 is set by fitting the projection 72a of the coupling 72 with the second assembling hole 77 of the spacer 70 and the positioning projection 62 of the fan 8A. Are positioned by fitting.
As shown in (A), the third mounting hole 78 of the spacer 70 and the caulking hole 63 of the fan 8A face each other,
Is inserted into the third assembling hole 78 and the caulking hole 63 and locked.

A fan formed using the eccentric ring 4 is referred to as a fan 8B. The manner of mounting the fan 8B will be described. In the fan 8B, the positioning projection 6
2 ′, the caulking holes 63 ′ are not at regular positions but at eccentric positions as can be understood from the above description.
That is, it is formed around the central axis P3. Then, as shown in FIG. 10B, the positioning projection 6 of the fan 8B is formed.
2 'is fitted and positioned in the second mounting hole 77 of the spacer 70, and the caulking hole 63' of the fan 8B faces the third mounting hole 78 of the spacer 70 as shown in FIG. The bush 79 is inserted into the caulking hole 63 'and the third assembling hole 78 and locked. At this time, since the spacer 70 is regulated by the protrusion 72a of the coupling 72 and is attached to the rotating body 71, the attachment position of the spacer 70 is constant in the radial direction, and therefore, when the fan 8B is attached, The fan 8B is mounted so as to be displaced by ΔX in the radial direction as compared with the case where the fan 8A is mounted. Therefore, the fan 8B is apparently
It is mounted displaced in the radial direction. However, since the center of gravity of the fan 8B is located on the rotation center of the rotating body 71,
There is substantially no adverse effect on noise and the like.

[0025]

According to the manufacturing method of the present invention, a fan with reduced or eliminated imbalance can be manufactured. In addition, even if the position of the eccentric body is adjusted by rotating the eccentric body in the circumferential direction, variations in weight of the fan and variations in resin consumption can be avoided without causing variation in the weight of the fan.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a molding die in a clamped state.

FIG. 2 is a cross-sectional view of a molding die equipped with a ring and in a clamped state.

FIG. 3 is a cross-sectional view showing a state where a resin is loaded into a molding cavity of a molding die.

FIG. 4 is a front view of a non-eccentric ring.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a front view of the eccentric ring.

FIG. 7 is a configuration diagram showing a state before a fan is mounted on a rotating body.

FIG. 8 is a front view of a main part of the fan.

FIG. 9 is a front view of a spacer.

FIG. 10 shows a state in which the positioning projection of the fan is fitted into the second mounting hole of the spacer, and FIG. 10A is a schematic sectional view when the positioning projection is not eccentric; FIG. 4 is a schematic cross-sectional view when the positioning projection is eccentric.

FIG. 11 shows a state in which the caulking hole of the fan faces the third assembling hole of the spacer. FIG. 11A is a schematic cross-sectional view when the caulking hole is not eccentric, and FIG. FIG. 4 is a schematic cross-sectional view when a caulking hole is eccentric.

[Explanation of symbols]

In the drawing, 1 is a molding die, 14 is a molding cavity, 16 is a cavity for a boss portion, 18b is an inner peripheral wall surface, 18c is an outer peripheral wall surface, 3 is an eccentric ring, 30 is a boss portion, and 4 is an eccentric ring. .

Continuation of the front page (56) References JP-A-2-179719 (JP, A) JP-A-64-16625 (JP, A) JP-A-62-117717 (JP, A) JP-A-60-99625 (JP) , A) JP-A-5-69453 (JP, A) JP-A-5-116186 (JP, A) Japanese Utility Model Application Laid-open No. 63-145617 (JP, U) US Patent 4,476,792 (US, A) (58) (Int.Cl. ⁷ , DB name) B29C 45/00-45/84 B29C 33/00-33/76

Claims (1)

(57) [Claims] 1. A molding die having a molding cavity for molding a fan and a ring-shaped regulating surface extending in a ring shape facing the molding cavity, and a position of the molding die is regulated by being addressed to the ring-shaped regulating surface. And a plurality of convex or concave mass adjusters provided on the base at predetermined intervals along an imaginary circle having a second center axis eccentric to the center axis of the base. Using a core, the base of the eccentric body is installed on the ring-shaped regulating surface of the mold, and the eccentric body is adjusted in its circumferential direction according to the imbalance of the fan to be molded. And a molding step of loading a molding material into the molding cavity of the molding die to form a fan, and removing the eccentric body from the fan. Fan manufacturing method.