CN1621696A - Manufacturing method of thermal fan - Google Patents

Abstract

The heat dissipating fan has one bearing assembly in the center and including mainly one metal sleeve and two bearings installed indirectly inside the metal sleeve. During manufacture of the heat dissipating fan, the bearing assembly is first set inside one corresponding fan mold, molten plastic is then injected into the mold and fan frame with combined bearing assembly may be finally taken out.

Description

Cooling fan manufacturing method

【Technical field】

The invention relates to a manufacturing method of a cooling fan, in particular to a manufacturing method of a cooling fan which can ensure the concentricity of two bearings.

【Background technique】

Bearings are an important component of cooling fans. A good bearing structure can help prolong the life of the fan and reduce the operating noise of the fan. Nano-ceramic bearings are sintered from nano-zirconia powder raw materials, which have the characteristics of long service life and wear resistance. Since nano-ceramic bearings do not need precision grinding after molding, their cost is also lower than that of precision grinding after molding. The processing of general ceramic bearings is low, so it has been widely used in computer cooling fans recently. However, the raw materials of nano-ceramic bearings are relatively expensive, and the cost of manufacturing longer-length nano-ceramic bearings will be higher. Therefore, if the large-scale computer cooling fan uses nano-ceramic bearings, two nano-ceramic bearings are generally installed on the periphery of the fan shaft at an appropriate length to prevent the shaft from shaking when it pivots.

Figure 3 is a partial cross-sectional view of a commonly used fan mold. The fan mold 10 mainly includes an upper mold 12 and a lower mold 14. A mold core 16 is protruding from the center of the upper mold 12 and the lower mold 14. The mold core 16 An injection molding space 18 can be formed in accordance with the outline of the fan mold 10 . Molten plastic is injected into the injection molding space 18, and the fan frame 20 as shown in FIG. 4 can be obtained after the plastic is cooled and solidified and released from the mold. However, since the melted plastic will be slightly deformed after cooling and solidifying, the inner diameter of the shaft sleeve 22 of the fan outer frame 20 will have deviations of different sizes in the axial length. If the commonly used bearing assembly method is used to wait for the outer frame 20 of the fan to be demoulded and cooled to form before the two-nanometer ceramic bearing 10 is assembled into the shaft sleeve 22 of the fan outer frame 20, it often occurs that the central axis of the two-nanometer ceramic bearing 10 is difficult to maintain Consistent question. Because the nano-ceramic bearing 10 has extremely high hardness and does not have the central self-regulating ability of the ball bearing, if the central axes of the two nano-ceramic bearings 10 cannot be guaranteed to be consistent, it will be difficult for the fan shaft to run in the nano-ceramic bearing 10, resulting in increased noise and Shortened lifespan.

【Content of invention】

The object of the present invention is to provide a method for manufacturing a cooling fan that can ensure the concentricity of the two bearings.

In order to achieve the above object, the present invention adopts the following technical solutions: a bearing assembly is provided in the center of the cooling fan in the cooling fan manufacturing method of the present invention, and the bearing assembly includes a sleeve and two bearings installed in the sleeve at intervals. When manufacturing the cooling fan, it mainly includes the following steps: installing the bearing assembly in a fan mold, the bearing assembly cooperates with the fan mold to form an injection molding space; injecting molten plastic into the injection molding space of the fan mold The melted plastic is solidified and formed into a fan frame, and at this time, the bearing assembly and the fan frame are taken out from the fan mold to obtain a fan frame integrated with the bearing assembly.

Compared with the prior art, the two bearings used in the manufacturing method of the cooling fan of the present invention are first tightly fixed into a metal sleeve to form a bearing assembly, and then the bearing assembly is installed in the fan mold, and then integrally molded with the outer frame of the fan , so the cooling fan manufacturing method can effectively ensure that the centerlines of the two bearings remain consistent, thereby solving the problem that the inner diameter of the fan bushing is deviated due to the cooling deformation of the molten plastic, and it is difficult to ensure the concentricity of the two bearings assembled into the fan bushing. , and simplify the fan assembly procedure.

The present invention will be further described below with reference to the accompanying drawings and embodiments.

【Description of drawings】

Fig. 1 is a cross-sectional view of the fan frame of the manufacturing method of the cooling fan of the present invention.

Fig. 2 is a partial sectional view of a fan mold used in the manufacturing method of the cooling fan of the present invention.

Fig. 3 is a partial sectional view of a common fan mold.

Figure 4 is a cross-sectional view of a common fan frame.

【Detailed ways】

Please refer to Fig. 1 and Fig. 2, the center of fan outer frame 30 of this cooling fan protrudes vertically upwards to be provided with a hollow shaft sleeve 32, and a bearing assembly 34 is installed in this shaft sleeve 32, and this bearing assembly 34 comprises a metal sleeve 36 and two Nanoceramic bearings38. A flange 40 protrudes inward from the middle of the metal sleeve 36 , wherein the inner diameter of the flange 40 is smaller than the outer diameter of the nano-ceramic bearing 38 . A shaft hole 42 is defined in the center of the two nano-ceramic bearings 38 for accommodating a fan shaft (not shown) to pivot therein. The two nano-ceramic bearings 38 are tightly mounted on both sides of the flange 40 of the metal sleeve 36 to form a spaced assembly. Wherein the metal sleeve 36 is formed by drilling metal materials (such as copper rods) through a precision lathe, and its inner hole has a higher machining accuracy so as to ensure that the two-nanometer ceramic bearing 38 installed in the metal sleeve 36 It has better concentricity.

The fan mold 50 corresponding to the fan outer frame 30 includes an upper mold 52 and a lower mold 54. The center of the lower mold 54 protrudes vertically upward with a pillar 56, and the center of the upper mold 52 protrudes downward with a mold core 58. When the fan frame 30 is formed, the bearing assembly 34 is sleeved on the stud 56 of the lower mold 54 , and then the upper mold 52 and the lower mold 54 are correspondingly merged together to form an injection molding space 60 . The outer diameter of the stud 56 is approximately equal to the inner diameter of the shaft hole 42 of the nano-ceramic bearing 38 , and the outer diameter of the mold core 58 is slightly smaller than the outer diameter of the metal sleeve 36 . After the upper mold 52 and the lower mold 54 are integrated, the top of the protrusion 56 abuts against the top of the mold core 58 . Then, molten plastic is injected into the injection molding space 60 of the fan mold 50 , and the molten plastic is solidified to form a cooling fan frame 30 . At this time, the upper mold 52 is separated from the lower mold 54, and the fan outer frame 30 that has been integrated with the bearing assembly 34 can be taken out as a whole.

Compared with the usual manufacturing method of the cooling fan, the manufacturing method of the cooling fan adopts two nano-ceramic bearings 38 which are tightly fixed into a metal sleeve 36 to form a bearing assembly 34, and then the bearing assembly 34 is mounted on the The fan mold 50 is then integrally injection-molded with the fan frame 30, so the cooling fan manufacturing method can effectively ensure that the centerlines of the two-nanometer ceramic bearings 38 remain consistent, and solve the problem of maintaining the two-nanometer ceramic bearings in the cooling fan. The problem of the concentricity of the two-nanometer ceramic bearing can also simplify the bearing assembly process to be carried out when the cooling fan is assembled.

The cooling fan manufacturing method can also be similarly applied to assembling one or more various types of bearings to the cooling fan, and the bearing fixing effect is good, the centering degree is high, and the assembly procedure is relatively simple.

Claims (10)

1. A method of manufacturing a heat dissipation fan, the center of the heat dissipation fan is provided with a bearing assembly, the bearing assembly includes a sleeve and two bearings installed in the sleeve at intervals, it is characterized in that: when manufacturing the heat dissipation fan, it mainly includes The following steps: install the bearing assembly in a fan mold, and form an injection molding space with the bearing assembly in cooperation with the fan mold; inject molten plastic into the injection molding space of the fan mold; the molten plastic is solidified and formed A fan outer frame, at this time, the bearing assembly and the fan outer frame are taken out from the fan mold as a whole, and a fan outer frame integrated with the bearing assembly can be obtained. 2. The manufacturing method of the cooling fan according to claim 1, wherein the sleeve is made of metal material through drilling. 3. The manufacturing method of the cooling fan as claimed in claim 1, wherein a flange protrudes inward from the middle of the bushing, the inner diameter of the flange is smaller than the outer diameter of the two bearings, and the two bearings are spaced apart. set to both sides of the flange. 4. The manufacturing method of the cooling fan as claimed in claim 1, wherein the two bearings are nano-ceramic bearings. 5. The manufacturing method of a cooling fan as claimed in claim 1, wherein the fan mold comprises at least an upper mold and a lower mold. 6 . The manufacturing method of the cooling fan according to claim 5 , wherein a shaft hole is formed in the center of the two bearings, and a protruding column protrudes vertically from the center of the lower mold. 7 . 7 . The manufacturing method of the cooling fan according to claim 6 , wherein the outer diameter of the stud is approximately equal to the inner diameter of the shaft hole of the bearing, and the bearing assembly is sleeved on the stud. 8 . 8 . The manufacturing method of the cooling fan according to claim 7 , wherein a mold core protruding from the center of the upper mold is abutted against the protruding column. 8 . 9. The manufacturing method of the cooling fan according to claim 8, wherein the outer diameter of the mold core is slightly smaller than the outer diameter of the sleeve. 10 . The manufacturing method of the cooling fan according to claim 1 , wherein a bushing protrudes from the center of the cooling fan, and the bearing assembly is installed in the bushing. 11 .

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