JP2001047298A - High-speed moving parts of plastic working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the machining workability, and to enable the machining at higher speed and higher accuracy by forming the whole part or its major part of a parts of a light metal matrix composite material containing ceramic of specified quantity, and containing free cutting inclusions of a specified ratio. SOLUTION: A slide body (a parts subjected to a high-speed motion) 10 is formed of a light metal matrix composite material LMMC which contains 0.1-1 wt.% free cutting impurities and is >=10 vol.% in ceramic content. The slide 10 is arranged on a crank shaft arranged in a crown 2 via a connecting rod 5. An upper die 6 is mounted on a lower surface of the slide 10, and is reciprocal in the approaching/retracting direction to/from the lower die 9. The slide 10 has guide 15, and parallel-translatable with respect to the lower die 9. LMMC has the mechanical properties including <=3.2 in specific gravity, 130-400 in Brinell hardness, and <=1.6×10-6/ deg.C in coefficient of linear expansion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed moving part (machine tool part) in a plastic working apparatus such as a press machine, and more particularly to a high-speed moving part which is reduced in weight and has good cutting workability.

[0002] In the present specification, "Al-based" means aluminum (Al) and Al containing a small amount of alloying elements (excluding Mg and free-cutting inclusions). Magnesium (Mg) and Mg containing a small amount of alloying elements (excluding Al and free-cutting inclusions), respectively.

[0003]

2. Description of the Related Art Conventionally, industrial machine parts (plastic working equipment), especially high-speed moving parts such as presses, have many complicated shapes.

For example, in a slide of a press machine, a rectangular box-shaped slide case has an intermediate height position as a connecting rod connecting wall portion, a lower surface as an upper mounting wall portion, and a horizontal direction between the two wall portions. It has a basic configuration in which a plurality of reinforcing ribs forming a through hole are arranged. Guide ribs are formed at four corners of the slide case in the vertical direction. Note that the connecting rod is for connecting the crankshaft and the slide.

As described above, the internal shape of the slide is hollow and complicated, and the external shape has irregularities. For this reason, the slide is generally a cast product, and the cast material is often cast iron (for example, gray cast iron) from the viewpoint of strength. On the other hand, the frame of the press machine is also generally a cast product having many irregularities, and is formed of cast iron from the viewpoint of strength.

The slide generated by the reciprocating motion of the slide
The friction heat generated between the frames and the friction heat generated by the rotation of the crankshaft are transmitted to the slide via the connecting rod and directly transmitted to the frame, so that the temperature of the slide and the frame is raised to a high temperature. .

Thus, even if the temperature of the slide and the frame becomes high, there is no substantial difference in the amount of thermal expansion between the slide and the frame, since both are cast articles using at least the same casting material as described above. Therefore, no problem occurs between the slide and the frame due to the thermal expansion based on the temperature rise.

On the other hand, recently, there has been an increasing demand for higher speed and higher accuracy of high speed moving parts such as slides in press machines and the like.

However, since the density of cast iron is large (for example, in the case of gray cast iron, the density is 7300 kg / m ³ ), the weight (mass) of the slide is relatively large. Therefore, the weight (mass) of the mold (upper mold) attached to the slide
Is added, and the inertia force of the slide (proportional to the mass)
Increase. The increase in the inertial force is a hindrance to speeding up and increasing accuracy of the press.

In order to increase the speed of the press, it is necessary to change the direction of rotation of the crankshaft while a large inertial force remains while converting the direction of rotation. If the direction is changed while resisting a large inertial force, the crankshaft will be misaligned, and as a result, it will be difficult to achieve high accuracy.

Therefore, in order to reduce the weight (mass) of the slide, which is a high-speed moving part, a low-density light metal (for example, in the case of Al, density: 2700 kg / m ³ ), particularly a light alloy which is easy to obtain strength, is used. An attempt was made to do so.

However, slides using light alloys
(High-speed motion parts)
The slides slide when the cast iron frame
Galling and wear are likely to occur with the hand parts). Light alloy
And cast iron have significantly different coefficients of thermal expansion (for example,
Gold: 21.1 × 10^-6/ m · ° C, gray cast iron: 9.8 x 10 ^-6
/ m ・ ℃) Thermal expansion of high-speed moving parts and thermal expansion of mating parts
This is because there is a large difference between.

[0013] Further, in the case of light alloys, it is generally difficult to obtain strength as compared with cast iron (since the rigidity is low). When a lower die is attached to the lower surface of the slide, the lower surface bends (particularly at a high temperature). ), The mold in the press machine may be displaced from the normal position. For this reason, it is difficult to achieve high precision in press working.

Therefore, a high-speed moving part (slide of the press machine) in a press machine or the like is replaced by an aluminum-based matrix composite (Al-MM) containing ceramics as an inclusion.
C) is proposed in Japanese Patent Application Laid-Open No. 10-193196.

[0015]

The above publication (Japanese Unexamined Patent Application Publication No.
As described in JP-A-193196), when a high-speed moving part (slide) in a press machine or the like is formed of an aluminum-based matrix composite (Al-MMC) using ceramics as an inclusion, the weight can be reduced and Problems concerning the difference in thermal expansion coefficient and the strength can be solved.

However, the above-mentioned Al group-MMC is silicon carbide.
Element (SiC) or alumina (Al_Two O _Three ) To Al-matri
But dispersed in the SiC or Al_Two O_Three Is
It is much harder than metal and has a bite,
(Free cutting).

[0017] In particular, SiC is harder than diamond and boron carbide (BC) among inorganic materials, and cutting of an Al-based MMC material containing a large amount of SiC is industrial (at low cost and production cost). It was extremely difficult to perform the process with good properties.

In order to produce high-speed moving parts with complicated shapes at low cost and with good productivity, machinability (machinability) is required.
Need to be better.

In order to further improve the productivity of the high-speed moving parts, it is necessary to standardize the high-speed moving parts.

The present invention has been made to solve the above-mentioned problems, and has the same strength and rigidity as those of conventional gray cast iron high-speed motion parts, and is lighter in weight and heat. A high-speed moving part having a similar expansion coefficient to a high-speed moving part provided by a conventional LMMC such as an Al-based MMC, which has a good cutting workability as compared with a high-speed moving part of a plastic working device. It is an object of the present invention to be able to cope with high-speed and high-precision parts.

[0021]

A high-speed moving part in a plastic working apparatus according to the present invention solves the above-mentioned problems by the following constitution. That is, a high-speed moving part in a plastic working apparatus, wherein the high-speed moving part or a main part thereof is a light metal matrix composite (LMMC: Light Metal Matrix Composites) containing ceramics as an inclusion.
, Specific gravity: 3.2 or less, Brinell hardness (H _BS ): 130 to 400, linear expansion coefficient: 16.0 × 1
In addition to showing mechanical properties of 0 ^-6 / ° C or less, LMMC
However, it further contains 0.1 to 1 wt% of free-cutting inclusions.

In the above, when the light metal forming LMMC is Al-based, the ceramic content is 10 to 45 vo.
l%, free-cutting inclusion content: 0.20 to 0.35 wt%, desirably, ceramic content: 15 to 35 vol%, free-cutting inclusion content: 0.22 to 0.32 wt%.

When the light metal forming the LMMC has a volume ratio of Al group / Mg group = 9/1 to 1/9, the ceramic content: 5 to 45 vol%, the free-cutting inclusion content:
0.02 to 0.60 wt%.

When the light metal forming the LMMC is based on Mg, the ceramic content is set to 10 to 45 vol% and the free-cutting inclusion content is set to 0.20 to 0.70 wt%.

Further, all or a major part of the high-speed moving parts are usually manufactured by casting.

The high-speed moving part is desirably applied to a slide of a press machine.

Further, it is desirable that the slide be separated into a slide main body (a main portion of a high-speed motion component) and an adapter member detachably attached to the slide main body.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A high-speed moving part in a plastic working apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a slide (high-speed moving part) 10 according to an embodiment of the present invention, which is incorporated in a straight-side type press (plastic working apparatus) 1 as shown in FIG.

The slide 10 is arranged in a column (frame) 3 via a connecting rod 5 on a crankshaft (not shown) arranged in the crown 2. The upper die 6 is mounted on the lower surface of the slide 10, and the lower die 9 is mounted on the bed 4 via the bolster 7.
Can reciprocate in a direction approaching / separating from the camera. The slide 10 has a guide rib 15 that is guided by the column 3, and can be moved in parallel with the lower die 9.

The specific structure of the slide is, as shown in the figure, separated into a slide body 10 and an adapter plate (mold mounting plate: adapter member) 13 which is detachably attached to the lower surface of the slide body 10 (by a bolt or the like). Configuration. With this configuration, only the slide body (the main part of the high-speed motion component) 10 is formed of the LMMC containing the free-cutting inclusion of the present invention, and the adapter plate 13 is formed of the LMMC containing no free-cutting inclusion. It can be formed. This is because the slide body 10 is required to have a complicated shape and high precision cutting, while the adapter plate 13 requires substantially no or very little cutting.

As a result, the amount of expensive LMMC material containing free-cutting inclusions can be reduced. Further, according to the change of the mold, the entire slide does not need to be replaced, and only the adapter plate 13 needs to be replaced. In addition, similarly, a member which does not require or requires a small amount of cutting, such as a guide rib 15 described later, may be an adapter member which can be appropriately attached to and detached from the main body.

The slide body 10 has a rectangular box-like outer shape, and guide ribs 15 extend below the slide lower surface 13 at four corners of the box. The connecting rod 5 is connected to the connecting rod 5 at an intermediate height in the vertical direction of the box. The rod connecting wall 11
The upper part is an open space, and the lower part of the rod connecting wall part 11 is formed hollow between the lower part and the upper die mounting wall part 13,
A plurality of holes 10a for removing core sand are formed in the hollow peripheral wall.

FIG. 3 shows a slide 19 according to another embodiment, which is mainly incorporated in a C-type press.

A specific configuration of the slide 19 is such that a guide portion 21 having inclined surfaces on both sides of a rear portion is formed in a vertical direction, and a pair of rib portions 2 are formed from the pair of guide portions 21 toward the front.
7 are arranged in parallel. A bearing portion 23 connected to the connecting rod is formed below the rib portion 27,
The lower slide surface formed below the bearing portion 23 is an upper mold mounting wall portion 25.

The slide (high-speed moving part) 1 as described above
Nos. 0 and 19 are reciprocating up and down at high speed and work by applying pressure to a processing material through an upper die. Therefore, in order to prevent abrasion and deformation of the slide itself, wear resistance, high rigidity and a certain degree of Hardness is required. Furthermore, it is required to be lightweight, have a low coefficient of thermal expansion, and have good cutting workability.

In addition to the above-mentioned slide, the same characteristics as those described above are required, such as a link / lever and a connecting rod in a press machine, and can be applied as a high-speed moving part of the present invention.

That is, the link / lever of the press is a slide driving mechanism in the link press.
It is a conversion mechanism between rotary motion and linear motion. The slide is reciprocated linearly at high speed, and the link / lever is rotated at high speed,
And strength against impact is required. Therefore, it is desired that the connection portion has abrasion resistance, high rigidity, light weight, and a low coefficient of thermal expansion.

The connecting rod is a slide drive mechanism driven by a crankshaft in a crank press and supported by the slide. As the slide is reciprocated at a high speed and presses the material to be pressed by applying pressure, abrasion resistance is required particularly at the connecting portions at both ends of the connecting rod. In addition, as with the above link lever, strength against impact is required,
It is a component for which high rigidity and further weight reduction are desired.

The present invention is applied to a gripper feeder 12 (FIG. 4) and a transfer device 22 (FIG. 5) which are transfer devices (plastic processing devices in a broad sense) used in combination with a plastic processing device such as a press machine. Applicable to high-speed motion parts.

The gripper feeder 12 is a transfer device for transferring a workpiece (a material to be pressed) to a processing position in accordance with the timing of the pressing. A moving gripper (high-speed moving part) 14 in the gripper feeder 12 performs a high-speed reciprocating motion. For this reason, wear resistance and the like are required, and weight reduction is required. The crank lever 18 for connecting the slide 16 (directly connected to the drive shaft 17) and the movable gripper 14 is a drive mechanism for reciprocating the movable gripper 14, and requires high rigidity, wear resistance, and the like. Is done. Incidentally, reference numeral 20 denotes the moving gripper 14.
Guide shaft.

The transfer 22 is a transfer device for transferring a workpiece in a straight line and enabling multi-step processing in parallel. A feed bar (high-speed motion part) 24 in the transfer 22 is a part of a feeder for continuous multi-stage processing, and is a pair of bars that perform high-speed rectangular motion.
Therefore, weight reduction, high rigidity, wear resistance, and the like are required.
In addition, 26 is a machine frame, and 28 is a cam case.

Each of the above high-speed moving parts (slides 10, 1
9; moving gripper 14; feed bar 24) is a light metal matrix composite (LMMC: Light Metal Matrix C).
omposites). It is not necessary that the entire high-speed motion part is formed of LMMC,
It is sufficient that at least the main part is formed of LMMC.

Here, the LMMC means a light metal matrix composite having ceramics as an inclusion.

As ceramics, Al ₂ O ₃ , Ti
Oxides such as O ₂ , ZrO ₂ , MgO, SiO ₂ , Si
Carbides such as C, B ₄ C, ZrC, WC, TiC, NbC, borides such as TiB ₂ and MoB ₂ , AlN, BN
And silicide CaO, Y ₂ O ₃
A partially stabilized zirconia-based material or the like to which the like is added can be used. Among these, alumina (Al ₂ O ₃ ) and silicon carbide (SiC), which are easy to obtain hardness (including strength) and easy to lower the coefficient of linear expansion, and which are versatile, can be suitably used. .

Which type of ceramic is to be selected depends on the type of the light alloy to be the matrix, the required hardness, and the coefficient of linear expansion. Select according to the expansion coefficient. Since ceramics have excellent heat resistance and a low coefficient of thermal expansion, they can cope with the problem of processing accuracy. Also, since it has excellent wear resistance, it can cope with high-speed movement. Furthermore, since it has excellent bending strength and high rigidity, it is possible to reduce deformation of high-speed moving parts. In addition, since the hardness is high, the high-speed moving parts can have an appropriate hardness by appropriately including the ceramics.

The composition for satisfying the following mechanical properties differs depending on the light metal used as the matrix.
Usually, the ceramic content is 5 vol% or more, preferably 10 vol% or more, and more preferably 20 vol% or more. The upper limit is limited to a range in which machinability can be improved when free-cutting inclusions are contained, and is usually less than 50 vol%,
Desirably 45 vol% or less, more desirably 35 vol%
% Or less.

The term “light metal” includes a light alloy and includes aluminum (Al), magnesium (Mg), titanium (T
i) one or two selected from the group of beryllium (Be)
Those based on more than one species can be used. Naturally, an alloy containing a small amount of another metal or nonmetal element is also included.

Usually, among these, A which is relatively easily available
Use 1 and / or Mg groups. Here, the meanings of the Al group and the Mg group are as described above. Al group and M
Which one of the g groups is employed is selected according to required characteristics, particularly, required specific gravity. That is, when there is a strong demand for weight reduction, a light metal containing a predetermined amount or more of an Mg group is used as described later.

Al has a wide range of uses as an industrial raw material, has a low specific gravity (density), and is about 1/3 of gray cast iron. Therefore, it can reduce the weight of high-speed motion parts, as well as bondability and uniformity with ceramics. Rich in Also, corrosion resistance and workability (cutting workability, casting workability) are good.

Further, since Mg has a specific gravity of 1.74, which is even lighter than the specific gravity of Al of 2.7 (the smallest specific gravity among practical metals), it is possible to reduce the weight of high-speed motion parts and to combine with ceramics. Excellent in cutting properties and easy to cut.

Usually, Al, Cu, Ni, Mn, S
Mg such as i, Zn, and Cr includes Zn, Zr, a rare earth element, and an aluminum alloy (Al
Base) and a magnesium alloy (Mg base) can have excellent mechanical functions.

Specifically, the following Al-based or Mg-based
Series light alloys.

Al-Mg type (for casting): Cu: 0.1
%, Si: 0.35%, Mg: 10%, Zn: 0.1
%, Fe: 0.35%, Mn: 0.1%, Ti: 0.2
%, Balance: Al Al-Mg type (for die casting) Cu: 0.2%, S
i: 0.3%, Mg: 4 to 11%, Zn: 0.1%, F
e: 1.8%, Mn: 0.3%, Ni: 0.1%, S
n: 0.1%, balance: Al Mg-Al-Zn-Mn (for casting) ... Al: 5.3
６6.7%, Zn: 2.5 to 3.5%, Mn: 0.15
0.6%, Si: 0.3% or less, Cu: 0.25%,
Ni: 0.01% or less, balance: Mg Al-Si-Cu (for die casting) ... Cu: 2.0
-4.5%, Si: 4.5-7.5%, Mg: 0.3
%, Zn: 1.0%, Fe: 1.3%, Mn: 0.5
%, Ni: 0.5%, Sn: 0.3%, balance: Al and LMMC are required to reduce the weight of high-speed motion parts, to reduce mechanical strength / wear, and to suppress thermal expansion coefficient. It shall have the following mechanical properties.

Specific gravity: 3.2 or less, preferably 3.0 or less, more preferably 2.5 or less.

If the specific gravity is high, it is difficult to meet the demand for weight reduction of high-speed moving parts. In order to set the specific gravity to 2.5 or less,
Usually, the Mg group content is 40 vol% or more in the metal matrix.

Brinell hardness (H _BS ): 130 to 400
But 130 to 200 (preferably 135 to 18
5) and 300 to 400 (preferably 350 to 39)
The group 0) is desirable because it is easily available.

If the hardness is too low, it is difficult to obtain the strength and abrasion resistance required for high-speed moving parts. Conversely, if the hardness is too high, the free-cutting property will be obtained even if the following free-cutting inclusions are contained. Is not improved. Increasing the content of the free-cutting inclusions hardly improves the free-cutting properties, but rather undesirably results in adverse effects on other mechanical properties, such as a reduction in fatigue life.

Linear expansion coefficient (linear expansion coefficient): 16 × 10 ^-6
/ ° C or lower, desirably 15 × 10 ⁻⁶ / ° C or lower.

If the coefficient of linear expansion is high, the high-speed moving parts are thermally expanded as described above, and galling is likely to occur on the counterpart parts made of cast iron or steel plate.

Furthermore, the shape of the high-speed moving part is complicated as described above, and the casting method is suitable. Although it has been extremely difficult to produce an LMMC material in the past, it has become possible to produce it by a casting method or a non-pressure infiltration method. In particular, in recent years, ceramics can be contained in an amount of 20% or more, and are widely used as lightweight and high-rigidity materials. Therefore, they are applied to high-speed motion parts having complicated shapes. Among casting methods, special casting methods such as a die casting method and a thixomolding method are currently attracting attention and are desirable.

Here, since some oxide-based ceramics and aluminum contain considerable oxygen, special consideration is required for appropriate deoxidation before casting and degassing during casting. In particular, before casting high-speed moving parts, stirring for uniform dispersion of ceramic particles and bubbling with an inert gas are necessary.

According to the present invention, in the high-speed moving part formed of the LMMC, the LMMC is formed of an LMMC having improved machinability by further containing 0.1 to 1 wt% of a free-cutting inclusion.

As described above, LMMC lacks machinability (machinability) due to its high ceramic content in order to bring mechanical properties (particularly, coefficient of linear thermal expansion) close to those of steel parts.

In the production stage of these high-speed motion parts (industrial machine parts), cutting (turning, drilling, boring, milling, planing, standing cutting, directly from an ingot or through a casting) Since machining such as broaching) and grinding is performed, it is industrially inevitable to improve the machinability (machinability).

Here, the machinability (cutting ability) is a comprehensive evaluation in each of the following items: wear resistance of the tool, chip handling property, finished surface roughness, cutting resistance. In particular, among these, improvements in wear resistance and finished surface roughness of the tool are required.

It is generally known that an Al alloy or the like is mixed with a free-cutting inclusion in order to improve the free-cutting property. However, as in the present invention, the ceramic content is 10%.
It was common knowledge in the art that the above-described LMMC would not be able to improve free-cutting properties even when free-cutting inclusions added to ordinary aluminum alloys and the like were added.

As the free-cutting component, those conventionally used in free-cutting steel, free-cutting stainless steel, free-cutting aluminum alloy, and the like can be used.

For example, metal particles such as lead (Pb), bismuth (Bi), and tellurium (Te) are used as metal materials, and oxide materials (anolsite: CaO.Al ₂ O) are used as nonmetal materials.
₃ , Gehlenite: 2CaO.Al ₂ O ₃ .SiO
₂ ), sulfur group (MnS, MnSe, MnTe) and the like. Of course, in the case of a non-metallic compound, it is sufficient that the compound finally becomes the compound, and the compound may be added separately or simultaneously with the passage of time. Of these, metal-based and sulfur-based are particularly desirable from the viewpoint of productivity.

The content of these free-cutting inclusions varies depending on the type of matrix, the type of ceramic, and the content, but is usually 0.1 to 1% by weight. If it exceeds 1 wt%, the mechanical properties of the LMMC itself may be adversely affected. Conversely, if it is less than 0.1 wt%, it is difficult to expect an improvement in free-cutting properties.

Usually, the composition is as follows.

When the light metal forming LMMC is Al-based and the ceramic content is 10 to 45 vol%,
Free-cutting inclusion content: 0.20 to 0.35 wt%.
Desirably, the ceramic content is 15 to 35 vol% and the free-cutting inclusion content is 0.22 to 0.32 wt%.

When the light metal forming the LMMC has a capacity ratio of Al group / Mg group = 9/1 to 1/9, and the ceramic content is 5 to 45 vol%, the free-cutting inclusion content is 0. 0.02 to 0.60 wt%.

When the light metal forming LMMC is Mg-based and the ceramic content is 10 to 45 vol%,
Free-cutting inclusion content: 0.20 to 0.70 wt%.

The addition of the free-cutting inclusions is usually carried out simultaneously with the addition of the alloying element.

[0076]

As described above, since the high-speed motion parts in the plastic working apparatus of the present invention are formed by including a light metal such as Al-based or Mg-based, the weight can be reduced, and the inertia force during high-speed motion can be reduced. Can be reduced, so that higher-speed and higher-precision processing can be performed.

Further, since it is formed containing ceramics, it exhibits the properties of ceramics, has a lower coefficient of thermal expansion than conventional aluminum alloys, and has improved mechanical properties (wear resistance, strength, rigidity, etc.). Therefore, higher-speed and higher-precision processing can be performed.

Furthermore, surprisingly, the presence of a small amount of free-cutting inclusions makes the cutting workability better than that of the conventional LMMC.
The machinability becomes easy, and it can be applied to parts having complicated shapes, and the life of the cutting tool can be further extended.

Further, by manufacturing the high-speed moving parts through the casting process, the number of man-hours required for the subsequent cutting process can be reduced.
This leads to an increase in productivity even for parts with complicated shapes.

Further, if a part of the high-speed moving part is formed separately from the other main body, a part of the high-speed moving part can be formed into a shape that can be shared irrespective of diversification of molds. Can be standardized and productivity can be improved.

[0081]

[Test Example] Table 1 used for high-speed motion parts in the present invention
Table 2 shows the mechanical properties of the LMMCs of Examples and Control Examples having the compositions of For reference, cast iron (FC25
The mechanical properties of 0) are also shown.

The Al and Mg groups have the following compositions, respectively: ceramics: silicon carbide (SiC); free-cutting inclusions: manganese sulfide.

Al group: Al-Mg based Cu: 0.1
%, Si: 0.35%, Mg: 10%, Zn: 0.1
%, Fe: 0.35%, Mn: 0.1%, Ti: 0.2
%, Balance: Al Mg group ... Mg-Al-Zn-Mn system Al: 5.3 ~
6.7%, Zn: 2.5-3.5%, Mn: 0.15-
0.6%, Si: 0.3% or less, Cu: 0.25%, N
i: 0.01% or less, balance: Mg The cutting conditions were a diamond tool, cutting speed: 50 m / min, feed: 0.01 mm / rev, cutting depth: 0.05 mm, and water-soluble cutting. Oil was used.

The evaluation criteria for machinability were as follows: ◎: very good, ○:
Good, △: Somewhat bad, Χ: Very bad.

From Table 2 showing the results, it can be seen that all of the high-speed moving parts in the plastic working apparatus of the present invention are lighter (lower specific gravity) and harder than cast iron as compared with cast iron. It can be seen that the coefficient of linear expansion is also significantly reduced.

For example, the LMMC of Example 1 contains about 20 vol% of ceramics, about 80 vol% of Al group, and 0.25 wt% of free-cutting inclusions. As a notable property of the LMMC of Example 1, first, the density is 3100 kg / m ³ , which is about the same weight as a conventional aluminum alloy. It has a coefficient of thermal expansion (linear expansion coefficient of 15.1 × 10 ⁻⁶ / (m · ° C.), which is considerably smaller than that of aluminum alloy, and is about 1.6 times that of conventional gray cast iron, which is within an allowable range. Strength is 355 (MPa)
It is stronger than aluminum alloy and conventional gray cast iron, and has a satisfactory elongation. Since the breaking strain is the same level as that of conventional gray cast iron, it is considered that there is no problem in use. Furthermore, since the tensile strength is stronger than gray cast iron and the breaking strain is the same level,
It can be said that it has high rigidity. Similarly, any of the other embodiments are satisfactory in terms of density, coefficient of thermal expansion, strength and rigidity.

Further, each of the LMMCs of the examples containing the free-cutting inclusions of the present invention had better machinability than Comparative Example 3 containing no free-cutting inclusions. I understand. In the case of Comparative Example 2 containing a large amount of ceramics, the free-cutting properties were hardly improved even if the free-cutting inclusions were contained. This is often the content of the ceramic is considered to be because too hard and H _BS 450 hardness.

Further, in the case of the Al-based / Mg-based composite system (Examples 4 to 7), the free-cutting ability is not significantly improved irrespective of the ceramic content and the amount of free-cutting inclusions (Evaluation of machinability). Are both Δ).

[0089]

[Table 1]

[0090]

[Table 2]

[Brief description of the drawings]

FIG. 1 is a schematic view of a main part of a gripper feeder provided with machine tool parts to which the present invention is applied;

FIG. 2 is a schematic diagram of a main part of the transfer device,

FIG. 3 is a front view showing a general press machine,

FIG. 4 is a perspective view showing a slide of the press machine in one embodiment.

FIG. 5 is a perspective view showing a slide of a press machine according to another embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press machine (plastic working apparatus) 2 Crown 3 Column 4 Bed 10, 19 Slide (high-speed moving parts) 15, 21 Slide guide part 12 Gripper feeder 14 Moving gripper (high-speed moving parts) 18 Crank lever (high-speed moving parts) 22 Transfer 24 Feed bar (high-speed motion parts)

Claims (8)

[Claims] 1. A high-speed moving part in a plastic working apparatus, wherein all or a main part of the high-speed moving part is a light metal matrix composite (LMMC) having a ceramic content of 10 vol% or more.
TES), wherein the LMMC has a specific gravity of 3.2 or less, a Brinell hardness (H _BS ) of 130 to 400, and a linear expansion coefficient of 16.0 × 1.
A high-speed moving part of a plastic working machine characterized by exhibiting mechanical properties of 0 ^-6 / ° C or less and further containing 0.1 to 1 wt% of free-cutting inclusions. 2. The light metal forming the LMMC is an Al-based material, and has a ceramic content of 10 to 45 vol% and a free-cutting inclusion content of 0.20 to 0.35 wt%. A high-speed moving part of the plastic working apparatus according to claim 1. 3. The ceramic content: 15 to 35 vo
3. The high-speed moving part of a plastic working apparatus according to claim 2, wherein the content of the free-machining inclusions is 0.22 to 0.32% by weight. 4. The light metal forming the LMMC has a capacity ratio of Al group / Mg group = 9/1 to 1/9, a ceramic content: 5 to 45 vol%, and a free-cutting inclusion content:
2. The high-speed moving part of the plastic working apparatus according to claim 1, wherein the content is 0.02 to 0.60 wt%. 5. The light metal forming the LMMC is Mg-based, and has a ceramic content of 10 to 45 vol% and a free-cutting inclusion content of 0.20 to 0.70 wt%. A high-speed moving part of the plastic working apparatus according to claim 1. 6. The high-speed moving part of a plastic working apparatus according to claim 1, wherein said high-speed moving part or a main part thereof is formed by casting. 7. The high-speed moving part of a plastic working apparatus according to claim 6, wherein the high-speed moving part is a slide of a press machine. 8. The plastic working apparatus according to claim 7, wherein the slide is separated into a slide main body (a main portion of a high-speed motion component) and an adapter member detachably attached to the slide main body. High-speed motion parts.