JPH11269574A - Manufacture of machine member formed of whisker reinforced alloy, and machine member formed of whisker reinforced alloy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a machine member formed of a whisker reinforced alloy capable of manufacturing the machine member of relatively complicated shape more inexpensively than a conventional technology. SOLUTION: A manufacturing method of a machine member formed of a whisker reinforced alloy comprises a first preform process in which a whisker is formed into a plurality of simple shapes obtained by dividing an outline shape of a desired machine member to manufacture a plurality of preform stocks consisting of the whisker, a second reinforcement forming process in which a plurality of preform stocks are combined in an outline shape and fixed to form a reinforcement 1 consisting of the whisker, and a third casting process in which the molten metal 2' of a base alloy is poured into a mold 41 in which the reinforcement 1 is inserted, and pressurized to impregnate the molten metal 2' in the reinforcement, cooled and solidified to cast a composite material of the base alloy and the reinforcement 1. Because the composite material is formed in the outline shape of the machine member to be manufactured, the cut man hour and the material cost for the whisker can be reduced, resulting in the cost reduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of metal matrix composites, and more particularly to the technical field of a method for manufacturing a whisker reinforced alloy machine member. The present invention also belongs to the technical field of mechanical members, and particularly to the technical field of whisker reinforced alloy mechanical members manufactured by the above-described manufacturing method.

[0002]

2. Description of the Related Art With the speeding up and acceleration and deceleration of various types of machinery including machine tools, moving members that perform rotation or translational movement among the members constituting the machinery include:
It is required to be lighter while satisfying the required properties. The properties required here include high strength, high rigidity, low coefficient of thermal expansion, good workability, and the like.

As one of the lightweight members satisfying these characteristics, there is an aluminum borate / whisker reinforced aluminum alloy composite material, and the composite material produced by the pressure casting method which is excellent in productivity is considered promising. ing. The composite material is a preform of aluminum borate whiskers impregnated with a base aluminum alloy under pressure and has excellent properties such as strength, rigidity, coefficient of thermal expansion, and wear resistance. In addition, the cost is relatively low. As literatures on the composite material, for example, “Evaluation of strength and heat resistance of aluminum borate whisker reinforced AC8A aluminum alloy composite material” (Katsuaki Suganuma et al., Light Metal,
1991, Vol. 41, No. 4, pp. 270-275).

[0004]

However, aluminum borate by the above-described pressure casting as the prior art has been proposed.
With whisker reinforced aluminum alloy composites, it is very difficult to produce large and complex shaped aluminum borate whisker preforms. Therefore, the preform of aluminum borate whiskers manufactured by the prior art is limited to a simple shape, and it is difficult to manufacture a material other than a material having a simple shape. That is, depending on the prior art, only a material having an extremely simple shape such as a solid round material, a hollow cylindrical material, and a square material is manufactured from the composite material, and it is difficult to manufacture a large-sized material having a relatively complicated shape. It is.

[0005] In addition, although the above-mentioned composite material has relatively good workability, it cannot be cut or ground with the same high efficiency as ordinary cast iron or steel, so that the composite material such as the main shaft of a machine tool can be used. Manufacture of a machine member having a complicated shape by cutting or grinding requires many man-hours. In addition, if a relatively complicated machine member is cut out from a material having a simple shape, the yield rate of a relatively expensive whisker decreases, which is disadvantageous in terms of the whisker yield rate. That is, if a relatively complicated mechanical member is cut out of a composite material having a simple shape including a whisker, there is an inconvenience that the cost increases in terms of the number of processing steps and the yield rate of the whisker.

Accordingly, an object of the present invention is to provide a method of manufacturing a whisker reinforced alloy machine member capable of manufacturing a large machine member having a relatively complicated shape at a lower cost than in the prior art. . Another object of the present invention is to provide a mechanical member made of a whisker reinforced alloy which is manufactured at a lower cost by the manufacturing method.

[0007]

Means for Solving the Problems and Their Functions and Effects In order to solve the above problems, the inventors have invented the following means. [Invention of Manufacturing Method] (First Means) A first means of the present invention is a method for manufacturing a mechanical member made of a whisker-reinforced alloy according to claim 1.

In this means, a preform manufacturing process, a reinforcing material preform forming process, and a casting process are sequentially performed.
A whisker reinforced alloy machine component is manufactured. That is, first, in the preform manufacturing process, whiskers are formed into a plurality of simple shapes obtained by dividing the schematic shape of a desired mechanical member,
A plurality of preforms made of whiskers are manufactured. As described above, it is difficult to form a preform made of whiskers into a complicated shape, but it is not particularly difficult to manufacture a preform having a simple shape.
This step is performed easily and inexpensively.

Next, in the reinforcing material preform forming step,
A plurality of preforms are combined and secured to the desired shape of the mechanical member to form a reinforced preform of the desired shape of the whisker. At this time, since a plurality of preforms are usually pressed and fixed to each other, the whiskers of both preforms are entangled with each other to some extent on the abutting surfaces of the adjacent preforms, and are entangled and integrally formed. A reinforcement preform is formed. Therefore, in the composite material after casting, the strength decrease at the joint surface of each preform is not so large, and a strength close to the strength at a portion other than the joint is obtained at the joint surface of each preform.

Further, in the casting step, while the reinforcing material preform having a general shape of a desired mechanical member is inserted in the mold, the molten metal of the base metal alloy is poured into the mold containing the reinforcing material preform. It is poured into. Then, the molten metal in the mold is pressurized, and the molten metal of the base metal alloy is impregnated into the minute space of the reinforcing material preform. Then, the molten metal is cooled and solidified, and a composite material of the solidified base metal alloy and the reinforcing material preform made of whiskers is cast into a general shape of a desired mechanical member.

According to the present invention, as described above, by forming a plurality of preforms of a simple shape and combining them, a reinforcing material preform made of whiskers is formed into a general shape of a desired mechanical member. That is, in the present means, the reinforcing material is formed into the desired shape of the mechanical member by combining the simple shape preform of the whisker without forming the whisker preform into the desired shape of the mechanical member from the beginning. A preform is formed. Therefore, as a result of the casting process, the composite material of the reinforcing material composed of whiskers and the base metal alloy is formed in a general shape of a desired mechanical member.

As a result, there is no need to mold the preform made of whiskers into a desired shape of a mechanical member from the beginning, so that there is no difficulty in the process of manufacturing the preform.
The manufacturing cost in the preform forming step is reduced. In addition, since the composite material of the reinforcing material preform and the base metal alloy obtained as a result of the casting process is formed in the approximate shape of the desired mechanical member, the step of cutting the composite material portion which is relatively difficult to cut is performed. , And the man-hour is reduced. Further, since the cutting of the preform portion is reduced, the yield rate of the expensive preform is improved, and the material cost of the expensive whisker material is reduced. That is, the cost can be reduced by the effect of reducing the number of steps and the effect of reducing the material cost.

Therefore, according to the present invention, it is possible to provide a method for manufacturing a whisker reinforced alloy mechanical member capable of manufacturing a relatively complicated large-sized mechanical member at a lower cost than in the prior art. is there. (Second Means) A second means of the present invention is a method for producing a whisker reinforced alloy machine member according to the second aspect.

[0014] In this means, the whisker is an aluminum borate whisker or an aluminum borate whisker containing at least alumina short fibers, and the base material alloy is an aluminum alloy. Therefore, the wettability of the whisker forming the reinforcement preform and the base metal alloy is high, and the whisker and the base metal alloy are compatible with each other in the casting process, so that a stronger composite material is formed. The specific gravity of aluminum alloy is about one-third that of steel, and the specific gravity of aluminum borate / whisker is also about the same as aluminum alloy. And a high weight saving effect can be obtained.

Therefore, according to this means, in addition to the effect of the above-described first means, there is an effect that a mechanical member made of a whisker reinforced alloy having higher strength and lower specific gravity can be manufactured. (Third Means) A third means of the present invention is a method of manufacturing a mechanical member made of a whisker reinforced alloy according to claim 3.

According to this means, in the reinforcing material preform forming step, a plurality of preforms each having a hole fixed to the core and fixed in the mold are sequentially fitted and fixed, and the preform is fixed. Stacked and fixed reinforcement preforms are formed. That is, when a preform is inserted into the core and laminated, for example, when a rotationally symmetrical large-sized mechanical member is manufactured, the core performs the function of aligning the axes of the plurality of preforms and coaxially fixing them. As a result, the reinforcing material preform in which the preforms are laminated is accurately formed coaxially, and the composite material formed as a result of the casting process is formed as a hollow member having a hollow portion in the shape of a core. Therefore, less boring is required in the finishing process.

Therefore, according to this means, in addition to the effect of the first means, there is an effect that the hollow member can be manufactured with high dimensional accuracy and at low cost. (Fourth Means) A fourth means of the present invention is a method for producing a mechanical member made of a whisker reinforced alloy according to the fourth aspect.

This means further includes, after the casting step, a finishing step in which the cast composite material is cut and rough-processed, and then the composite material is heat-treated and then subjected to finishing by precision cutting or grinding. That is, in the as-cast state, the cast member has both a portion composed of the base alloy and a portion composed of the composite material. Therefore, if the heat treatment is performed while the cast member is left as it is, the cast member may be cracked due to the different thermal expansion coefficients between the portion composed only of the base material alloy and the portion composed of the composite material. . Therefore, a portion consisting only of the base material alloy is cut off by the roughing, and the outer shape of the member is adjusted to an outer size slightly more than the finished size only by the portion consisting of the composite material. By this roughing, the part consisting only of the base metal alloy around the composite material has been shaved off, so even when subjected to heat treatment, the cast member may crack due to the difference in the coefficient of thermal expansion. Is prevented.

Thereafter, if heat treatment is performed, quenching and annealing can be performed if the base material alloy is a steel material, and age hardening can be promoted if the base material alloy is an aluminum alloy. . In any case, the effect of relaxing the internal stress by heat treatment and improving the strength of the product can be expected. If the internal stress is relaxed, subsequent deformation is prevented beforehand, so that dimensional accuracy is improved.

[0020] Finally, if the finishing process is performed by precision cutting or grinding, not only the dimensional accuracy can be improved, but also the deformation due to aging can be suppressed by heat treatment, and the dimensional accuracy over a long period of time can be reduced. You can expect to maintain accuracy. Therefore, according to this means, in addition to the effect of the first means described above, the material can be improved by heat treatment while preventing cracks during heat treatment, and the dimensional accuracy of the product over a long period of time can be improved.

[Invention of a product] (Fifth means) A fifth means of the present invention is a mechanical member made of a whisker reinforced alloy according to claim 5. This means is to form a reinforcing material preform in which a plurality of parts of a simple shape made of whiskers are integrally joined and formed, and a fine space between the whiskers of the reinforcing material preform by joining the respective parts together. And a base metal alloy to be satisfied. Therefore, this means is manufactured at low cost for the same reason as in the first embodiment.

Therefore, according to this means, there is an effect that a mechanical member made of a whisker reinforced alloy which can be manufactured at lower cost can be provided.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of manufacturing a whisker reinforced alloy mechanical member and the embodiment of the whisker reinforced alloy mechanical member of the present invention will be described below so that those skilled in the art can understand the present invention. The examples are clear and sufficient. [Example 1] (Manufacturing method of Example 1) A method of manufacturing a whisker reinforced alloy machine member as Example 1 of the present invention is a method of manufacturing a whisker reinforced alloy machine tool having a completed shape as shown in FIG. This is a method for manufacturing the spindle housing member 100.

To manufacture the spindle housing member 100, which is a mechanical member made of a whisker-reinforced alloy of the present invention, by a conventional technique, a spindle housing made of a composite material made of a hollow cylindrical whisker-reinforced alloy having an outer shape shown by a broken line 100 'is used as a material. The member 100 will be cut out. Then, it takes a lot of time to cut out a large amount of the composite material having poor machinability as compared with the alloy material, and the whisker-reinforced composite material portion is cut out in a large amount, so that the yield rate of the expensive whisker material is deteriorated. As a result, both the manufacturing cost and the material cost are increased depending on the manufacturing method of the related art, so that the spindle housing member 100 having such a shape has to be an expensive product.

Therefore, in the method for manufacturing a whisker reinforced alloy machine member of the present invention, a preform manufacturing step, a reinforcing material preform forming step, a casting step, and a finishing step are sequentially performed, and the whisker reinforced alloy machine member ( A spindle housing member 100 that is a rotating member) is manufactured. That is, first, in the preform manufacturing process, as shown in FIG. 2, aluminum borate whiskers are formed into a plurality of simple shapes obtained by dividing the schematic shape of the spindle housing member 100, and a plurality of preforms 11 to 11 made of the same whiskers are formed. 16 are manufactured. As described above, it is difficult to form a preform made of whiskers into a complicated shape, but it is not particularly difficult to manufacture simple preforms 11 to 16 having a substantially hollow cylindrical shape. The process is performed easily and inexpensively.

Here, in order to form solid preforms 11 to 16 from a fibrous aluminum borate whisker material, as shown in FIGS. 3 (a) and 3 (b), a container-like forming jig is used. Use 3. The procedure for molding the preforms 11 to 16 using the molding jig 3 will be described below with reference to FIG. 4 taking the preform 14 as an example.

That is, first, as shown in FIG. 1, a ring-shaped donut shape 32 is fitted into a core 31 comprising a flange portion 311 and a core portion 312 to be integrated, and as shown in FIG. The side mold 33 is opened to cover the periphery of the core 32. And, as shown in
After the side mold 33 is closed and fixed with the stoppers 34, an aluminum borate whisker or the like as a raw material is introduced around the core 312 in the side mold 33. After the whisker is inserted, the surface of the whisker is averaged and vibrated to make the whiskers intrude each other to reduce the volume occupied by the whiskers to some extent.

Here, the raw material is composed of a mixture of aluminum borate whiskers of 78% and alumina fibers of 22%, and a small amount of silica binder is added to the raw material. Aluminum borate
The purpose of mixing the alumina short fibers into the whiskers is to improve the moldability and strength of the preform and to improve the handling of the preform in a subsequent step.

Thereafter, as shown in (1), the core 31 and the side mold 33 are covered with the upper lid mold 35, and the whiskers are compressed and fixed by the upper lid mold 35 so as to have a predetermined shape and volume. This state is the state shown in FIG. 3B, and the whisker is pressed by the core 31
2. In the substantially hollow cylindrical space formed by the side mold 33, the donut mold 32, and the upper lid mold 35, the preform 14 is compacted. The substantially hollow cylindrical body of the preform 14 formed by the whiskers is formed by a conical surface whose inner peripheral surface is slightly tapered.

After a predetermined time, the whisker is moved to the preform 14.
At the stage of compacting, as shown in FIG.
And the side mold 33 are sequentially removed, and as shown further, the dish mold 36 with the projection 361 is placed below and fitted into the through hole 310 of the flange portion 311 of the core 31. And
As shown in (1), the preform (14) and the donut mold (32) are removed from the core (31), and the preform (14) and the donut mold (32) are turned over as shown in (2). Complete.

All the preforms 11 to 16 are formed as described above, but the intermediate flange portion 102 of the spindle housing member 100 of the preforms 11 to 16 is formed.
A side mold having a larger inner diameter is used only for the preform 13 that forms (see FIG. 1). Other preform 1
The same side mold 33 is used for 1, 12, 14 to 16, but the outer diameter of the core of the core is different. as a result,
As shown in FIG. 2 again, preforms 11 to 16 having the same taper angle and the same inner diameter as the adjacent preforms 11 to 16 are formed. With the above, the preform manufacturing process is completed.

Next, in the reinforcing material preform forming step,
A plurality of preforms 11 to 16 are connected to the spindle housing member 1.
The reinforcement preform 1 is formed by combining and fixing with the general shape of 00, and having the general shape of the main shaft housing member 100 made of whiskers. That is, as shown in FIG. 5, the mold (mold) 41 is preheated to 300 ° C., the core 42 is heated to 350 ° C., and each of the preforms 11 to 16 is heated to 800 ° C.
C. and the punch 44 is preheated to 300.degree.
Thereafter, as shown in FIG. 6, the core 42 is inserted into the mold 41 placed horizontally on the pedestal, and a hole for fitting the core 42 is formed in the core 42 fixed in the mold 41. The formed six preforms 11 to 16 are sequentially fitted and fixed. That is, all the preforms 11 to
After the 16 is fitted, the preforms 11 to 16 are compressed to predetermined dimensions in the axial direction by the holding metal fittings 43 for bolting, and the reinforcing material preform 1 in which the preforms 11 to 16 are stacked and fixed is formed. Leads to formation. At this time, by fitting the preforms 11 to 16 into the core 42 and stacking the cores, the core 42 performs the function of aligning the axes of the preforms 11 to 16 and coaxially fixing them. As a result, the reinforcing material preform 1 in which the preforms 11 to 16 are stacked is formed coaxially with high precision. Therefore, the composite material resulting from the subsequent casting process is:
It is suitable as a material for the rotationally symmetric main shaft housing member 100. In addition, since the hollow member is formed in the shape of a core and a hollow portion is formed, less boring is required in the finishing step.

Also, since the preforms 11 to 16 are pressed and fixed to each other, the whiskers of the preforms that come into contact with each other are entangled with each other to some extent on their respective contact surfaces, and are entangled to form a reinforcing material plate. Reform 1
Is formed. Therefore, the composite material 200 after casting (FIG. 1)
0), the strength reduction at the joint surfaces of the preforms 11 to 16 is not so large, and a strength close to the strength at a portion other than the joint is obtained at the joint surfaces of the preforms 11 to 16.

Further, in the casting step, as shown in FIG.
With the reinforcing material preform 1 having the general shape of the main shaft housing member 100 inserted in the mold 41, the molten metal 2 ′ of the base metal alloy 2 made of an aluminum alloy contains the reinforcing material preform 1. The molten metal is poured into the mold 41. Here, the main components of the aluminum alloy which is the base metal alloy 2 are aluminum 87%, silicon 11%, and copper 2%, and the temperature of the molten metal 2 'is 850 ° C.

Then, as shown in FIG. 8, the molten metal 2 ′ in the mold 41 is pressed to about 100 MPa by the punch 44, and the molten metal 2 ′ of the base metal alloy 2 is impregnated into the minute space of the reinforcing material preform 1. Let me do. Then, after the molten metal 2 ′ is cooled and solidified, the punch 44 is removed as shown in FIG.
00 is removed from the mold 41. Note that, for the purpose of facilitating the removal, the inner peripheral surface of the mold 41 is formed as a slightly divergent tapered surface.

Thereafter, if the holding metal 43 is scraped off and the core 42 is removed, as shown in FIG. 10, a composite material of the base metal alloy 2 in which the molten metal 27 is solidified and the reinforcing material preform 1 made of whiskers is formed. 21 is the spindle housing member 1
It is cast to a general shape of 00. In the casting 200, an alloy portion 22 made of only an aluminum alloy is formed on the outer periphery of the composite material portion 21.

Finally, in the finishing step, after the casting 200 is cut and rough-processed, a finishing process is performed in which the composite material 21 is heat-treated and then subjected to precise grinding. That is, in the as-cast state, as shown in FIG. 10 again, in the casting 200, the part 22 composed of only the base alloy and the part 21 composed of the composite material coexist. Therefore, if the casting 200 is left as it is and subjected to a heat treatment, the casting 200 has a different thermal expansion coefficient between the portion 22 composed of the base metal alloy alone and the portion 21 composed of the composite material.
Cracks may occur. Therefore, the part 22 consisting only of the base metal alloy is shaved off by roughing,
Only the part composed of the composite material 21 is 2 to 2
The outer shape of the member is adjusted to an outer size having a margin of about 3 mm. As a result of this roughing, the portion 22 consisting only of the base metal alloy attached to the periphery of the composite material 21 has been shaved off. Breaking of the composite material 200 is prevented.

Thereafter, when heat treatment is performed, the age hardening is promoted and the internal stress is reduced in the base alloy 2 of the aluminum alloy, and the effect of improving the strength of the spindle housing member 100 as a product can be expected. . In the heat treatment, a T6 heat treatment is performed. After a solution treatment (525 ° C. × 8 h), an aging treatment (160 ° C. × 10 h) is performed. Further, if the internal stress of the spindle housing member 100 is relaxed by the heat treatment, subsequent deformation is prevented, so that the dimensional accuracy is improved and the strength is also improved. Furthermore, the heat treatment also has the effect of reducing the hysteresis of thermal expansion.

Finally, if the spindle housing member 100 is completed by performing a finishing process by precision grinding, not only the dimensional accuracy can be improved, but also deformation due to aging can be suppressed by heat treatment.
It is expected that dimensional accuracy will be maintained over a long period of time. In addition,
In the above-mentioned manufacturing method, the time required until the mold is dispersed in the casting process is about 8 hours, and the number of steps is about 5 to 6 man hours.

(Operation and Effect of First Embodiment) The method of manufacturing a whisker reinforced alloy mechanical member of the present embodiment is implemented as described above, and thus has the following operation and effect. That is, in the method for manufacturing a whisker reinforced alloy mechanical member of the present embodiment, as described above, the simple-shaped preforms 11 to 1 are used.
By forming and combining these, the reinforcing material preform 1 made of whiskers or the like is formed in the general shape of the main shaft housing member 100. That is, by combining preforms 11 to 16 having a simple shape without forming a preform such as a whisker into the relatively complicated schematic shape of the spindle housing member 100 from the beginning, the schematic shape of the spindle housing member 100 can be obtained. A reinforcement preform 1 is formed. Therefore, in the casting 200 obtained as a result of the casting process, the composite material 21 of the reinforcing material preform 1 made of whiskers or the like and the base material alloy 2 is used.
Is formed in a schematic shape of the spindle housing member 100.

As a result, there is no need to mold the preform made of whiskers into the general shape of the main shaft housing member 100 from the beginning, so that there is no difficulty in the process of manufacturing the preform, and the manufacturing in the process of forming the preforms 11 to 16 is not difficult. Cost is reduced. Moreover, the composite material 21 of the reinforcing material preform 1 and the base material alloy 2 obtained as a result of the casting process
Is formed in the general shape of the main shaft housing member 100, so that the step of cutting the composite material portion 21, which is relatively difficult to cut, is suppressed to a minimum and the number of steps is reduced. Also,
Since the cutting of the portion of the composite material portion 21 is reduced, the yield rate of the whisker is improved, and the material cost of the expensive whisker material is reduced. That is, the cost can be reduced by the effect of reducing the number of steps and the effect of reducing the material cost.

Therefore, according to the method of manufacturing a whisker reinforced alloy mechanical member of the present embodiment, the spindle housing member 1
Large machine parts with relatively complicated shapes such as 00
There is an effect that it can be manufactured at a lower cost than the prior art. Next, in the method of manufacturing a mechanical member made of a whisker-reinforced alloy according to the present embodiment, the whisker 1 is an aluminum borate whisker containing short alumina fibers (only aluminum borate whisker may be used), and the base metal alloy 2 is aluminum. Alloys, all of which are aluminum-based materials.
Therefore, the wettability of the whisker forming the reinforcing material preform 1 and the base material alloy 2 are high, and the whisker and the base material alloy 2 are compatible with each other in the casting process, so that a stronger composite material 21 is formed. Also,
The specific gravity of aluminum alloy is about one-third that of steel, and the specific gravity of aluminum borate whiskers is about the same as aluminum alloys.The specific gravity of whisker reinforced alloy machine parts to be manufactured is about one-third that of steel. Therefore, there is an effect that a high lightening effect can be obtained.

Specifically, the specific gravity of the main shaft housing member 100 formed of the composite material 21 is only about 2.7 to 2.8, which is about one third of the specific gravity of steel. Also,
It is estimated that the Young's modulus is about 120 to 130 MPa and the tensile strength is about 400 MPa, and high strength and high rigidity are achieved. Further, the coefficient of thermal expansion is estimated to be about 10 × 10 ⁻⁶ / ° C. That is, in the composite material forming the spindle housing member 100, the specific gravity is one-third that of steel, the strength and the coefficient of thermal expansion are similar to those of cast iron, and the vibration damping effect is better than that of steel.

(Product of Embodiment 1) A mechanical member made of a whisker reinforced alloy as Embodiment 1 of the present invention is the main shaft housing member 100 manufactured by the above-described manufacturing method. As shown in FIG. 1 again, the main shaft housing member 100 includes a reinforcing material preform formed by integrally joining a plurality of portions 11 to 16 each having a simple shape made of a whisker or the like;
Each of the portions 11 to 16 is formed of a composite material composed of a base metal alloy that joins each other and fills a fine space between the reinforcement preforms.

As described above, the joining surfaces of the portions 11 to 16 are not only joined by the base metal alloy, but also include reinforcing material preforms such as whiskers. Has strength. Also, as shown by the composite material portion 13 in FIG. 1, the joining surface with the portion 12 and the joining surface with the portion 14 are off the corners (where stress is concentrated) formed by the intermediate flange portion 102. The occurrence of cracks from these corners is prevented.

Therefore, according to the mechanical member made of the whisker reinforced alloy of this embodiment, it is possible to provide a rotating member which is less expensive than the conventional technology but has the same mechanical characteristics as the conventional technology. . (Modification 1 of Embodiment 1) As Modification 1 of this embodiment, as shown in FIG. 1 again, only three preforms corresponding to the small diameter portion 101, the intermediate flange portion 102, and the large diameter portion 103 are used. Thus, it is possible to manufacture the main shaft housing member 100 made of the whisker reinforced alloy. That is, in FIG. 2, an integral preform in which the preforms 11 and 12 are joined, a preform 13 and an integral preform in which the preforms 14 to 16 are joined are formed. In this way, by reducing the number of preforms in the preform manufacturing process and performing the same reinforcing material preform forming process, casting process, and finishing process as in Example 1 described above, the main shaft with fewer joints and higher strength The housing member 100 can be manufactured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a completed shape of a spindle housing member according to a first embodiment.

FIG. 2 is a cross-sectional view showing the shape of each preform of Example 1.

FIG. 3 is a set diagram showing a configuration of a jig for forming a preform of Example 1 (a) Plan view (b) Side sectional view

FIG. 4 is an explanatory view showing a procedure of a preform manufacturing process of Example 1.

FIG. 5 is a cross-sectional view showing a preheating temperature of each part in a casting process of Example 1.

FIG. 6 is a cross-sectional view showing a reinforcing material preform forming step of Example 1.

FIG. 7 is a schematic view showing pouring in a casting process in Example 1.

FIG. 8 is a cross-sectional view showing pressure casting in the casting step of Example 1.

FIG. 9 is a cross-sectional view showing the molding in the casting step of Example 1.

FIG. 10 is a cross-sectional view showing a configuration of a casting after a casting step in Example 1.

[Explanation of symbols]

1: Reinforcing material preform 11 to 16: Preform (made of aluminum borate whisker) 2: Aluminum alloy (as base material alloy) 2 ': Melt 3: Preform forming jig 31: Core 310: Through hole 311: Flange 312: Core 32: Donut 33: Side 34: Clamp 35: Top lid 36: Dish 361: Protrusion 40: Cavity 41: Mold 4
2: Core 43: Holder 44: Punch 45: Knockout piston 100: Main shaft housing member (made of aluminum borate / whisker reinforced aluminum alloy) 101: Small diameter portion 102: Intermediate flange portion 10
3: Large diameter portion 100 ': Hollow cylindrical material shape by conventional technology 200: Casting 20: Hollow portion 21: Composite material portion 22: Alloy portion

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hajime Fukami 1-1-1, Asahi-cho, Kariya-shi, Aichi, Japan Toyota Machine Works Co., Ltd. (72) Inventor Katsuhiko 1-1-1, Asahi-cho, Kariya-shi, Aichi Prefecture Toyota Machine Works Co., Ltd. (72) Inventor Kozo Imanishi 1-1-1, Asahi-cho, Kariya-shi, Aichi Pref.Toyota Machine Works Co., Ltd. Inside the Toyota Central Research Institute (72) Inventor Shinichi Towa 41-41, Yokomichi, Nagakute-cho, Aichi-gun, Aichi Prefecture

Claims (5)

[Claims] 1. A preform manufacturing step of forming a whisker into a plurality of simple shapes obtained by dividing a general shape of a desired mechanical member and manufacturing a plurality of preforms comprising the whiskers; A reinforcing material preform forming step of forming and reinforcing the roughly shaped reinforcing material preform made of the whiskers in combination with a shape, and pouring a molten metal of the base material alloy into a mold in which the reinforcing material preform is inserted. After the molten metal in the mold is pressurized to impregnate the molten metal of the base metal alloy into the reinforcing material preform, the molten metal is cooled and solidified, and the molten metal of the base metal alloy and the whiskers are formed. A method for producing a whisker reinforced alloy machine member, comprising: a casting step of casting a composite material. 2. The whisker according to claim 1, wherein the whisker is an aluminum borate whisker or an aluminum borate whisker containing at least short alumina fibers, and wherein the base material alloy is an aluminum alloy. A method for manufacturing a mechanical member made of a reinforced alloy. 3. The reinforcing material preform forming step includes: sequentially inserting and fixing the plurality of preforms having holes formed therein to be fitted into the core fixed in the mold;
The method for producing a mechanical member made of a whisker-reinforced alloy according to claim 1 or 2, wherein the step is a step of forming the reinforcing material preform in which the preforms are stacked and fixed. 4. The method according to claim 1, further comprising: after the casting step, after cutting and roughing the cast composite material, heat treating the composite material, and then performing a finishing process by precision cutting or grinding. A method for producing a mechanical member made of a whisker-reinforced alloy according to claim 1. 5. A reinforcing material preform in which a plurality of parts of a simple shape made of whiskers are integrally joined and formed, and a mother body which joins the respective parts together and fills a fine space between the whiskers. A mechanical member made of a whisker reinforced alloy, comprising a material alloy.