TWI391565B - Fan components and manufacturing method thereof - Google Patents

Description

Fan member and method of manufacturing same

The present invention relates to a fan member and a method of manufacturing the same, and more particularly to a fan member made by forging using a magnesium alloy.

Generally, fan components, such as fan frame bases, fan wheels or cover plates, are mostly made of composite plastic materials such as ABS, PC or PBT by injection molding, wherein the composite plastic materials are mostly light in weight and have High plasticity and low cost, so it is widely used in the production and application of fan components.

With the continuous advancement of technology, the efficiency of electronic products is getting faster and faster, and the size of products is getting smaller and smaller. Therefore, how to cool and cool electronic products is also a subject of active research and development. At present, most of the electronic products mostly use the cooling fan as the main cooling and cooling tool, so that the size of the cooling fan and the improvement of the heat dissipation performance are relatively the main directions for improvement in the field.

However, due to the poor thermal conductivity of the composite plastic material itself, the operating temperature of the plastic fan component itself is easily increased rapidly, and it is not easy to cool down, which affects the overall heat dissipation performance of the cooling fan composed of the plastic fan component; The mechanical strength of the composite plastic material itself is insufficient, so that the overall structural strength of the plastic fan member is also affected, which is disadvantageous for the plastic fan member to be used in a high temperature and continuous vibration environment for a long time, thereby shortening the composition of the plastic fan member. The life of the cooling fan.

In view of the above, in order to overcome the disadvantages of the conventional plastic fan member described above, an aluminum alloy is selected as another material for manufacturing the fan member, wherein the aluminum alloy has excellent heat transfer capability and high mechanical strength compared to the aforementioned composite plastic material. The strength and other advantages, so the aluminum alloy fan component can effectively improve the overall heat dissipation performance of the cooling fan, and strengthen its structural reliability and extend the service life.

However, since the specific gravity of the aluminum alloy material is about 2.8 times that of the composite plastic material (for example, ABS), the weight of the fan member is greatly increased, because the increase in the weight of the fan wheel causes the cooling fan to operate. When the load of the mandrel or other supporting members is also increased, the high specific gravity aluminum alloy fan member will increase the mechanical stress and shorten the service life of the cooling fan.

In addition, since the composite plastic material is subjected to a process limitation of the injection molding method in the production of the plastic fan member, and the mechanical strength of the material itself is insufficient, the plastic fan member formed by injection molding must maintain a certain thickness ratio. (The minimum thickness that can be achieved at present is about 1 mm), so that the plastic fan member can be molded, and the size of the plastic fan member cannot be further reduced.

Moreover, when the aluminum alloy material is used to produce the fan member, the aluminum alloy fan member is mostly formed by aluminum extrusion or die casting. However, the aluminum extrusion or die casting method often causes surface defects of the aluminum alloy fan member (for example: Porosity or squeezing, etc., so that the initially formed fan member needs to go through a surface treatment procedure to eliminate surface defects, resulting in too complicated process steps and high production cost. On the other hand, due to the limitation of the process of aluminum extrusion or die-casting, the aluminum alloy fan member made of aluminum extrusion or die-casting must also maintain a certain thickness ratio (the minimum thickness currently achievable is about 0.8 mm). The aluminum alloy fan member is molded and the shape of the finished product is also limited. Based on the above reasons, the present invention provides a fan member and a manufacturing method thereof that further overcome the above disadvantages, and improve the heat dissipation performance and overall structural strength of the heat dissipation fan.

The present invention provides a fan member and a manufacturing method thereof, which are made of a fan member by a mechanical manufacturing method, thereby obtaining a lightweight fan member having high structural strength and high thermal conductivity, which is the present invention. purpose.

The present invention provides a fan member and a method of manufacturing the same, which is characterized in that the AZ-31 magnesium alloy is formed into a fan member by forging, and is thinned while maintaining the mechanical strength of the fan member, which is another object of the present invention. .

The present invention provides a fan member and a manufacturing method thereof for improving the overall heat dissipation efficiency of the heat dissipation fan, which is another object of the present invention.

In order to achieve the foregoing object, the technical means utilized by the present invention and the effects achievable by the technical means include: a fan member made of AZ-31 magnesium alloy, the composition of which comprises: by weight percentage Aluminum is 2.5 to 3.5%, copper is 0.05% or less, calcium is 0.04% or less, iron is 0.005% or less, manganese is 0.2% or less, zinc is 0.6 to 1.4%, nickel is 0.005% or less, cerium is 0.1% or less, and the balance is magnesium. In this way, the lightweight fan member with high structural strength, high thermal conductivity and thin thickness is formed by mechanical molding, which helps to improve the heat dissipation efficiency of the cooling fan and prolong its service life.

The above and other objects, features, and advantages of the present invention will become more apparent from the aspects of the appended claims. Generally, the cooling fan is mainly composed of a fan member such as a frame base 1, a fan wheel 2 and a cover plate 3. The preferred embodiment of the present invention is selected by an AZ-31 magnesium alloy by mechanical molding. The fan member such as the fan frame base 1, the fan wheel 2 and the cover plate 3, wherein the component weight percentage of the AZ-31 magnesium alloy comprises: aluminum (Al) 2.5 to 3.5%, copper (Cu) 0.05% or less, Calcium (Ca) is 0.04% or less, iron (Fe) is 0.005% or less, manganese (Mn) is 0.2% or less, zinc (Zn) is 0.6 to 1.4%, nickel (Ni) is 0.005% or less, and cerium (Si) is 0.1% or less, and The remaining ratio is magnesium (Mg). The AZ-31 magnesium alloy has a composition density of about 1.77 g/cm ³ .

Please refer to the following Table 1. The AZ-31 magnesium alloy used in the present invention is superior to the composite plastic material ABS in mechanical strength (for example, tensile strength and tensile strength) and heat transfer coefficient; 2 and 3, it can be clearly seen from the drawing that the magnesium alloy fan member of the present invention is significantly more than the conventional ABS plastic fan member, regardless of the magnesium alloy fan wheel 2 or the magnesium alloy cover plate 3. The high resistance and high thermal conductivity of the magnesium alloy fan component can overcome the defects of the structural strength of the conventional ABS plastic fan component and prolong the service life of the cooling fan.

Also, please refer to the following Tables 1 and 2, compared to the aluminum alloy fan member made of the ADC12 aluminum alloy, although the aluminum alloy fan member is not inferior in mechanical strength and thermal conductivity than the magnesium alloy fan member of the present invention. However, since the specific gravity of the AZ-31 magnesium alloy is much lower than the specific gravity of the ADC12 aluminum alloy, the weight of the magnesium alloy cover plate 3 of the present invention is only 60% of the weight of the conventional aluminum alloy cover plate under the same volume ( As shown in Table 2, it is also known that other magnesium alloy fan frame base 1 or fan wheel 2 and the like are relatively lightweight, which can greatly reduce the overall weight of the cooling fan and reduce the cooling fan during operation. The load of the mandrel (not shown) of the fan wheel 2 or other supporting members extends the service life of the cooling fan.

Under the premise that the electronic products are miniaturized and lightweight, the magnesium alloy fan member of the present invention can not only greatly reduce the weight of the component but also achieve the purpose of weight reduction compared with the conventional aluminum alloy fan member, and at the same time, the cooling fan can be retained. Excellent structural strength.

Referring to FIG. 4, in the method for fabricating the fan member according to the preferred embodiment of the present invention, the AZ-31 magnesium alloy fan member is preferably formed by mechanical forging, and the steps include: corresponding to the shape of the fan member The profile is prefabricated with an upper mold and a lower mold; an AZ-31 magnesium ingot is placed in one of the mold holes of the lower mold; finally, the upper mold is matched with the lower mold to punch the AZ-31 magnesium ingot by using a forging die. Forging to form a finished AZ-31 magnesium alloy fan component.

More specifically, a corresponding cavity is formed on the corresponding surface of the upper mold and the lower mold, and the two mold cavities are formed in the same shape as the contour of the fan member to be formed (for example, the upper mold and the lower mold) After the molds are butted together, the two mold cavities can jointly form the contour of the fan frame base 1 and the upper mold is coupled to the forging press of a forging press; the lower mold is disposed on the forging press. A fixed anvil, and correspondingly located below the upper mold.

Then, before the AZ-31 magnesium ingot is placed in the cavity of the lower mold for punching, the AZ-31 magnesium ingot may be preheated according to the requirements of the finished product of the fan component (for example, size, precision or mechanical properties). Above the recrystallization temperature; heating the AZ-31 magnesium ingot to room temperature (25 ° C) or more, but not exceeding its recrystallization temperature; or, without heating the AZ-31 magnesium ingot, directly at room temperature and other three forging environments One of the temperatures is subjected to a subsequent punch forming process. Among them, the AZ-31 magnesium alloy has a recrystallization temperature of about 300 °C.

Finally, the upper mold is moved toward the lower mold by the forging of the forging press, so that the upper mold generates an impact force applied to the AZ-31 magnesium ingot in the cavity of the lower mold, and the upper mold is passed through the upper mold. The continuous impact forces the AZ-31 magnesium ingot to deform in accordance with the contour shape of the two-cavity, thereby obtaining the finished product of the AZ-31 magnesium alloy fan member. Moreover, after the finished product is obtained by the foregoing process, the finished product may be surface-treated by baking, anodic treatment or sputtering to enhance the surface texture.

Compared with the conventional composite plastic material, the fan member is manufactured by injection molding, and the aluminum alloy material is formed by aluminum extrusion to form the fan member, and the size and thickness thereof cannot be reduced. The magnesium alloy fan member formed by the forging according to the present invention By virtue of the high strength and forging process characteristics of the AZ-31 magnesium alloy itself, the forged magnesium alloy fan member can reduce its thickness to 0.5 mm while maintaining the same structural strength, and its dimensional tolerance can also be controlled. Within +/- 0.02 mm, the purpose of weight reduction and size thinning is further achieved.

Furthermore, the present invention forms the magnesium alloy fan member by forging, and does not cause surface defects such as pores or fine lines on the surface of the finished product, and the invention can eliminate the compensation compared with the aluminum alloy fan member formed by die casting. Surface treatment procedures such as soil or dressing, which have the effect of simplifying the overall process and increasing production efficiency.

Please refer to Table 3 below. The cooling fan number 1 is composed of ADC12 cover and ABS fan wheel. The number 2 cooling fan is composed of ABS cover and ABS fan wheel. The number 3 cooling fan is AZ-31. The cover plate and the AZ-31 fan wheel are composed; the number 4 cooling fan is composed of the AZ-31 cover plate and the ABS fan wheel; and the number 5 cooling fan is composed of the ADC12 cover plate and the AZ-31 fan wheel, and The AZ-31 fan wheel has an average thickness of about 0.5 mm, and the ABS fan wheel has an average thickness of about 1 mm. It can be clearly seen from Table 3 that since the thickness of the AZ-31 fan wheel of the present invention can be reduced to 0.5 mm, the amount of air passing through the AZ-31 fan wheel (e.g., No. 3, 5) per minute is comparable to that of passing through The amount of air blown by ABS fan wheels (such as numbers 1, 2, and 4) can be significantly improved.

Moreover, as shown in the following Table 4, the cooling fans of Nos. 1 to 3 are tested for operation, wherein the initial temperature and the ambient temperature of each of the cooling fans are both 25 ° C, and are achieved after continuous operation after at least 30 minutes. A stable operating temperature. It can be seen from Table 4 that the final stable operating temperature of the cooling fans of Nos. 1 and 2 rises to 61.5 ° C, and the temperature change value of the two is 36.5 ° C; in comparison, the cooling fan of No. 3 is AZ-31. The high thermal conductivity of the magnesium alloy results in a final stable operating temperature of 47 ° C and a temperature change of only 22 ° C. In summary, the cooling fan composed of the magnesium alloy fan component made by forging can not only effectively improve the overall driving efficiency, but also further improve the heat dissipation performance.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

[this invention]

1. . . Fan frame base

2. . . Fan wheel

3. . . Cover

Figure 1 is a perspective exploded view of a fan member in accordance with a preferred embodiment of the present invention.

Fig. 2 is a comparison of stress-strain of the magnesium alloy cover plate of the preferred embodiment of the present invention compared to the plastic cover plate and the aluminum alloy cover plate.

Fig. 3 is a graph showing the stress-strain comparison of a magnesium alloy fan wheel according to a preferred embodiment of the present invention compared to a plastic fan wheel.

Figure 4 is a flow chart showing a method of manufacturing a fan member in accordance with a preferred embodiment of the present invention.

Claims (12)

A fan member is used to form a heat dissipating fan, the composition comprising: 2.5 to 3.5% of aluminum, 0.05% or less of copper, 0.04% or less of calcium, 0.005% or less of iron, 0.2% or less of manganese, and 0.6% of zinc. 1.4%, nickel 0.005% or less, 矽0.1% or less, and the remaining ratio is magnesium. The fan member according to claim 1, wherein the fan member is a frame base. The fan member according to claim 1, wherein the fan member is a fan wheel. The fan member according to claim 1, wherein the fan member is a cover. The fan member according to claim 1, 2, 3 or 4, wherein the fan member has a specific gravity of 1.74 to 1.8 g/cm ³ . A method for manufacturing a fan member, the method comprising: prefabricating an upper mold and a lower mold which can be mutually abutted, wherein one of the mold holes and one of the lower mold portions form a contour shape of a fan member; The ingot is in the cavity of the lower mold; and the upper mold is used to drive the upper mold to continuously forge the magnesium ingot in the cavity of the lower mold to form a magnesium alloy fan member. The method for fabricating a fan member according to the sixth aspect of the invention, wherein the magnesium ingot is selected as an AZ-31 magnesium alloy. The method of manufacturing a fan member according to claim 7, wherein the magnesium ingot is preheated before the magnesium ingot is placed in the cavity of the lower mold. Above 300 ° C, the subsequent punching process. The method for manufacturing a fan member according to the seventh aspect of the invention, wherein the magnesium ingot is preheated to between 25 ° C and 300 ° C before the magnesium ingot is placed in the cavity of the lower mold, and then the subsequent punching is performed. program. The method of manufacturing a fan member according to claim 6, wherein the fan member is a frame base. A method of manufacturing a fan member according to the invention of claim 6, wherein the fan member is a fan wheel. A method of manufacturing a fan member according to the invention of claim 6, wherein the finished fan member is a cover.