JP7033399B2 - Sliding mechanism - Google Patents

Description

The present invention relates to a sliding mechanism. More specifically, the present invention relates to a sliding mechanism and a sequential molding method.

Conventionally, large three-dimensional products with complicated contours and large areas of bottoms, and side walls having vertical or near-vertical angles are molded from metal or non-metal plates with high precision. A dieless forming apparatus having a relatively simple structure has been proposed (see Patent Document 1).

This dieless forming device is a tool set, a pressing mechanism that cooperates with the tool set, and a plurality of numerically controlled drive devices for moving the tool set and the pressing mechanism in the X-axis, Y-axis, and Z-axis directions as a whole. And have.

The tool set includes a base, a fixing pressing mechanism, a plate material holding mechanism, and a plate material holding mechanism. The fixed pressing mechanism is provided on the base, and has a flat shape that matches the contour of the bottom surface of the leg body erected from the base and the bottom contour of the product to be molded, and is attached to the top of the leg body. It has a plate type. The plate material holding mechanism has a plurality of columns arranged on the base, a support plate having a window hole surrounding the top plate type, and movable in the Z-axis direction via the columns, and fixed to the base. It has at least a pair of elevating actuators whose output ends are connected to a support plate. The plate material pressing mechanism has a frame-shaped pressing plate that sandwiches the peripheral edge of the plate material with a support plate in the plate thickness direction, and a pressing actuator for variably controlling the pressing force of the plate material peripheral edge portion by this pressing plate. There is.

Further, the pressing mechanism is arranged above the plate material holding mechanism. The pressing mechanism has a pressing tool portion at the tip, which is in contact with the upper surface of the plate material and cooperates with the top plate mold to form the product shape.

Further, in the plurality of numerically controlled drive devices, the pressing tool portion is moved around the top plate mold in a movement path matching the product shape, and the pressing mechanism and the support plate are made of a plate material with respect to the top plate mold. Move relatively in the plate thickness direction.

In this dieless forming device, the pressing mechanism has a rod shape, the pressing tool portion includes a free-rotating sphere, and further has a lubrication hole for supplying a lubricant to the sphere. Includes aspects of

In such a dieless forming device, when the pressing tool portion moves on the contour line while pressing the plate material, the sphere rotates due to the friction with the plate material, and the relationship with the plate material is not the sliding friction but the rolling friction. .. As a result, the coefficient of friction and heat generation are suppressed, so that the molding speed can be increased and springback can be suppressed.

Further, in such a dieless forming device, a circulation type lubrication / cooling system is configured in which a lubricating liquid is constantly supplied and recovered to a molded portion by a pressing mechanism. Therefore, for example, at the time of high-speed molding exceeding 0.3 m / s, adhesion that tends to occur in the stainless steel material is prevented, and in the aluminum material, the occurrence of cracks is prevented, and high-speed molding of 0.3 m / s or more is prevented. Is also possible.

Japanese Patent No. 4287912

However, the dieless forming apparatus described in Patent Document 1 has a problem that the life of the tool is shortened due to the increase in the speed of sequential molding accompanying mass production.

The present invention has been made in view of the problems of the prior art. An object of the present invention is to provide a sliding mechanism and a sequential forming method capable of extending the life of the tool by reducing the coefficient of friction between the metal plate to be formed and the tool.

The present inventors have made extensive studies to achieve the above object. As a result, the sliding mechanism used in sequential molding is a galvanized steel sheet that is a metal plate to be molded and a predetermined tool that pressure-molds the metal plate to be molded via a lubricating oil film formed by a predetermined lubricating oil. , And have found that the above object can be achieved, and have completed the present invention.

According to the present invention, it is possible to provide a sliding mechanism and a sequential forming method capable of extending the life of the tool by reducing the coefficient of friction between the metal plate to be formed and the tool.

FIG. 1 is a cross-sectional view illustrating an outline of sequential molding. FIG. 2 is a cross-sectional view schematically showing a portion of the sliding mechanism shown in FIG. 1 surrounded by the surrounding line II. FIG. 3 is a graph showing the relationship between the surface roughness (Ra) of the surface of the sliding portion of the tool and the friction coefficient (μ). FIG. 4 is a perspective view illustrating an outline of the friction test. FIG. 5 is a graph showing the friction coefficient (μ) of each example. FIG. 6 is an atomic force microscope (AFM) photograph showing the results of observing the surface shape of the sliding portion of the tool in Example 1 with an atomic force microscope (AFM). FIG. 7 is an optical micrograph showing the result of observing the surface shape of the metal plate to be molded in Example 1 with an optical microscope. FIG. 8 is an atomic force microscope (AFM) photograph showing the results of observing the surface shape of the metal plate to be molded in Example 1 with an atomic force microscope (AFM).

Hereinafter, the sliding mechanism and the sequential molding method according to the embodiment of the present invention will be described in detail with reference to the drawings. The dimensional ratios of the drawings quoted below are exaggerated for convenience of explanation and may differ from the actual ratios.

FIG. 1 is a cross-sectional view illustrating an outline of sequential molding. Further, FIG. 2 is a cross-sectional view schematically showing a portion of the sliding mechanism shown in FIG. 1 surrounded by the surrounding line II.

As shown in FIGS. 1 and 2, the sliding mechanism 1 of the present embodiment is used in sequential molding in which the metal plate 30 to be molded has a three-dimensional shape. The sliding mechanism 1 includes a metal plate 30 to be molded and a tool 10 for pressure-molding the metal plate 30 to be molded via the lubricating oil film 20. Further, the tool 10 has a coating film 11 made of diamond on at least the surface of the sliding portion 10a. Further, the lubricating oil film 20 contains a lubricating oil 21 containing an organic compound 23 having a hydrophilic group 231. Although not particularly limited, the lubricating oil film 20 of the illustrated example has an adsorption film 25 formed by adsorbing the hydrophilic group 231 in the organic compound to the metal plate 30 to be molded.

Here, in the present invention, the "film made of diamond" means a hydrogen-terminated diamond coating in which the ends of carbon atoms are terminated with hydrogen on the surface of the sliding portion. Although not particularly limited, such a hydrogen-terminated diamond coating can be formed, for example, by a chemical vapor deposition (CVD) method using a gas containing hydrogen.

As described above, the sliding mechanism used in sequential molding includes a metal plate to be molded and a tool for pressure-molding the metal plate to be molded via a lubricating oil film, and the tool is at least on the surface of the sliding portion from diamond. The lubricating oil film contains a lubricating oil containing an organic compound having a hydrophilic group.

Therefore, the coefficient of friction between the metal plate to be molded and the tool can be reduced, and the life of the tool can be extended. Although not particularly limited, such a sliding mechanism is used, for example, in a sequential forming tool itself or a sequential forming apparatus provided with a sequential forming tool. The moving speed of the tool in sequential molding is not particularly limited. For example, it may have a high speed of 0.3 m / s to 5 m / s or a low speed of less than 0.3 m / s, and can be applied to sequential molding at any speed.

Further, although not particularly limited, such a sliding mechanism can also be used, for example, in a sequential molding method.

That is, as shown in FIGS. 1 and 2, in the sequential forming method of the present embodiment, the metal plate 30 to be formed is sequentially formed into a three-dimensional shape by using the tool 10 and the lubricating oil 21. Then, this sequential molding method uses a sliding mechanism 1 including a metal plate 30 to be molded and a tool 10 for pressure-molding the metal plate 30 to be molded via a lubricating oil film 20 formed by the lubricating oil 21. .. Further, the tool 10 has a coating film 11 made of diamond on at least the surface of the sliding portion 10a. Further, the lubricating oil 21 contains an organic compound 23 having a hydrophilic group 231.

As described above, when the metal plate to be molded is sequentially molded using a tool and a lubricating oil, the metal plate to be molded is pressure-molded via the metal plate to be molded and a lubricating oil film formed by a predetermined lubricating oil. It was decided to use a sliding mechanism equipped with a predetermined tool.

Here, in the present invention, the "predetermined tool" means a tool having a coating film made of diamond on at least the surface of the sliding portion.

Further, in the present invention, the "predetermined lubricating oil" means a lubricating oil containing an organic compound having a hydrophilic group.

Therefore, the coefficient of friction between the metal plate to be molded and the tool can be reduced, and the life of the tool can be extended. The moving speed of the tool in the sequential forming method is not particularly limited. For example, it may have a high speed of 0.3 m / s to 5 m / s or a low speed of less than 0.3 m / s, and can be applied to a sequential molding method of any speed.

The operation of the above sliding mechanism and the sequential molding method will be specifically described with reference to FIGS. 1 and 2.

First, although not particularly limited, the fixing device 50 includes, for example, a lower fixing tool 51 and an upper moving tool 53, and the fixing tool 51 and the movable tool 53 include a metal plate 30 to be molded. The metal plate 30 to be molded is firmly held by sandwiching the periphery of the metal plate 30. The metal plate 30 to be molded has an unmolded portion that is sequentially molded into a three-dimensional shape.

Further, although not particularly limited, the tool 10 has a rod shape, for example, and is held by a driving device (not shown) with the sliding portion 10a facing downward.

Further, although not particularly limited, the tool 10 can move, for example, in three orthogonal axial directions.

Further, although not particularly limited, a multi-axis control type robot, a numerical control (NC) machine tool, or the like can be used as the drive device. However, when tilting the axis of the tool, it is preferable to use a multi-axis control type robot.

Further, although not particularly limited, the lubricating oil film 20 is arranged, for example, on at least a part of the surface of the unmolded portion.

Further, although not particularly limited, the lubricating oil film 20 may be formed, for example, by applying the lubricating oil 21 to the metal plate 30 to be molded before sequential molding, while performing sequential molding. , Lubricating oil 21 may be formed by applying the lubricating oil 21 to the metal plate 30 to be molded.

Then, although not particularly limited, the sliding portion 10a having the coating film 11 made of diamond of the tool 10 slides on the surface of the lubricating oil film 20 while moving along a predetermined movement path, for example. Further, although not particularly limited, the sliding portion 10a is subjected to, for example, a pressure for sequentially molding the unmolded portion of the metal plate 30 to be molded into a three-dimensional shape via the lubricating oil film 20. Is applied to the unmolded portion of the metal plate 30 to be molded.

In the illustrated example, since the metal plate 30 to be molded, which is partially shown by a broken line, is formed into a concave three-dimensional shape, the movement path of the tool 10 is a circular path as shown by an arrow W in the figure. Then, the pushing amount (advancing amount / descending amount) and the moving path of the tool 10 into the metal plate to be molded 30 are gradually displaced for each lap. At this time, the movement path is gradually displaced toward the center side of the metal plate 30 to be molded.

As a result, the metal plate to be molded can be gradually deformed in the plate thickness direction to form a concave three-dimensional shape.

At present, it is considered that the coefficient of friction between the metal plate to be molded and the tool is reduced by the following mechanism.

The lubricating oil forming the lubricating oil film contains an organic compound having a hydrophilic group. Such lubricating oil is easily adsorbed on the metal plate to be molded. On the other hand, such lubricating oil is hardly adsorbed by a tool having a coating film made of diamond on the surface of the sliding portion. This is because the diamond coating is a hydrogen-terminated diamond coating in which the ends of carbon atoms are terminated with hydrogen on the surface of the sliding portion. If there is such a relationship between the metal plate to be molded, the tool, and the lubricating oil, a lubricating oil film that is familiar to the metal plate to be molded is formed between the metal plate to be molded and the tool. In other words, a stable lubricating oil film is formed on the surface of the metal plate to be molded.

With such a mechanism, the coefficient of friction between the metal plate to be molded and the tool can be reduced, and the life of the tool can be extended.

However, it goes without saying that even if the above-mentioned effects are obtained by a mechanism other than the above-mentioned mechanism, it is included in the scope of the present invention.

Further, although not particularly limited, it is preferable that the lubricating oil film 20 has an adsorption film 25 formed by adsorbing the hydrophilic group 231 in the organic compound 23 to the metal plate 30 to be formed. As a result, a more stable lubricating oil film is formed between the metal plate to be molded and the tool. As a result, the coefficient of friction can be reduced and the life of the tool can be extended.

Although not particularly limited, it is preferable that the organic compound 23 having the hydrophilic group 231 has excellent compatibility with the lubricating oil 21.

Further, although not particularly limited, it is preferable that the hydrophilic group 231 in the organic compound 23 contains, for example, one or both of a hydroxyl group and a carboxyl group. Hydrophilic groups such as hydroxyl groups and carboxyl groups are easily adsorbed by the metal plate to be molded. As a result, a more stable lubricating oil film is formed between the metal plate to be molded and the tool. As a result, the coefficient of friction can be reduced and the life of the tool can be extended.

Further, although not particularly limited, the content ratio of the organic compound 23 having the hydrophilic group 231 in the lubricating oil 21 is preferably, for example, 5% by mass or more, and 10% by mass or more. More suitable. The content of the organic compound having a hydrophilic group may be 100% by mass. As a result, a more stable lubricating oil film is more appropriately formed between the metal plate to be molded and the tool. As a result, the coefficient of friction can be reduced and the life of the tool can be extended.

Further, although not particularly limited, for example, the organic compound 23 having a hydrophilic group 231 is preferably a synthetic ester constituting a synthetic ester oil. As such a synthetic ester, for example, one having a hydrophilic group 231 such as a hydroxyl group and a carboxyl group can be appropriately produced. Specific examples of such synthetic esters include, but are not limited to, higher fatty acid monoglycerides such as oleic acid and stearic acid, and diglycerides.

Further, although not particularly limited, the base oil may contain natural fats and oils, mineral oils, synthetic oils and the like, in addition to the organic compounds having a hydrophilic group 231 in the lubricating oil 21. These may be applied individually by 1 type, or may be applied by mixing 2 or more types. Further, various additives added to the lubricating oil may be added as additives.

Further, although not particularly limited, it is preferable to apply, for example, vegetable oil, which is a natural fat or oil, as the base oil. Vegetable oils, which are natural fats and oils, are usually triglycerides of fatty acids and glycerin. When a vegetable oil is applied as a base oil, it is also possible to use a lubricating oil composed of an ester containing a natural ester as the base oil and a synthetic ester as a compound having a hydrophilic group.

Further, although not particularly limited, such a lubricating oil 21 includes Airlube S-33KT (composition: 100% ester (natural oil (vegetable oil) + synthetic ester oil)) manufactured by Kyodo Yushi Co., Ltd., and viscosity ( 40 ° C.): 33 mm ² / s) can be mentioned as a suitable example. Although not particularly limited, the lubricating oil 21 may use, for example, mineral oil to adjust the ester content.

Further, although not particularly limited, in the tool 10, for example, the surface hardness of the coating film 11 made of diamond is preferably HV1000 to 10000 in terms of micro Vickers hardness (10 g), and the thickness of the coating film 11 is not particularly limited. It is preferably 0.3 to 20 μm. A tool having such a diamond coating has a high hardness and a thick coating. Therefore, the original life of the tool can be extended.

FIG. 3 is a graph showing the relationship between the surface roughness (Ra) of the surface of the sliding portion of the tool and the friction coefficient (μ). The first plot from the left in the figure is Ra = 0.03 μm, μ = 0.08, and the second plot is Ra = 0.13 μm, μ = 0.08, which is the third plot. The plot is Ra = 0.25 μm, μ = 0.19, and the fourth plot is Ra = 0.36 μm, μ = 0.29. The second plot from the left in the figure corresponds to Example 1 described later. Further, the first, third and fourth plots from the left side in the figure are obtained by appropriately adjusting the surface roughness of the surface of the sliding portion of the tool of Example 1.

Although not particularly limited, from FIG. 3, the tool 10 has, for example, that the surface roughness Ra of the coating film 11 made of diamond is 0.13 μm or less, as shown by the arrow X in the drawing. It turns out to be suitable. Further, at present, it can be seen that the surface roughness Ra is preferably 0.03 to 0.13 μm. As shown in FIG. 3, a tool having such a coating film made of diamond can reduce the coefficient of friction (μ), and therefore has low aggression against the metal plate to be molded. As a result, the surface roughness of the metal plate to be molded, which is sequentially molded by the tool, can be reduced.

Further, although not particularly limited, the base material of the tool 10 includes, for example, tool steel such as high-speed tool steel (SKH) specified in Japanese Industrial Standards, and high-carbon chrome bearing steel (SUJ). A rod-shaped base material made of bearing steel such as, and a rod-shaped base material made of cemented carbide (tungsten carbide) are suitable. A hydrogen-terminated diamond film is preferably formed on such a rod-shaped substrate by, for example, a chemical vapor deposition (CVD) method using a gas containing hydrogen. From the viewpoint of adhesion to the hydrogen-terminated diamond coating, it is more preferable to apply a rod-shaped base material made of cemented carbide (tungsten carbide). In particular, those having a cobalt (Co) content of 5 to 6% by mass, which is close to the linear expansion coefficient of diamond, are preferable.

Further, although not particularly limited, examples of the metal plate 30 to be molded include magnesium (Mg), aluminum (Al), titanium (Ti), vanadium (V), chromium (Cr), and manganese (Mn). , Iron (Fe), Cobalt (Co), Nickel (Ni), Zinc (Zn), Yttrium (Y), Zirconium (Zr), Molybdenum (Mo), Lantern (La) or Tungsten (W) or two of them. Those containing the above are suitable. In the metal plate to be molded containing such a metal, for example, an oxide film containing oxygen (O) is formed on the surface thereof, so that the hydrophilic group of the organic compound is easily adsorbed. Therefore, a more stable lubricating oil film is formed between the metal plate to be molded and the tool. As a result, the coefficient of friction can be reduced and the life of the tool can be extended.

Further, although not particularly limited, it is preferable to apply a galvanized steel plate as the metal plate 30 to be molded. Further, although not particularly limited, as the galvanized steel sheet, alloyed galvanized steel sheet (GI material) and alloyed hot-dip galvanized steel sheet (GA material) can be mentioned as suitable examples. Since the zinc (Zn) plating forms an oxide film containing oxygen (O) on its surface, it easily adsorbs the hydrophilic group of the organic compound. Therefore, a more stable lubricating oil film is formed between the metal plate to be molded and the tool. As a result, the coefficient of friction can be reduced and the life of the tool can be extended.

Further, although not particularly limited, it is preferable to apply an aluminum alloy plate as the metal plate 30 to be molded. Since the aluminum alloy plate (Al material) forms an oxide film containing oxygen (O) on its surface, it easily adsorbs the hydrophilic group of the organic compound. Therefore, a more stable lubricating oil film is formed between the metal plate to be molded and the tool. As a result, the coefficient of friction can be reduced and the life of the tool can be extended.

Further, although not particularly limited, it is preferable to apply a steel plate (Steel material) as the metal plate 30 to be molded. Further, although not particularly limited, as the steel sheet, a high-strength steel sheet can be mentioned as a suitable example. Since the steel sheet has an oxide film containing oxygen (O) on its surface, it easily adsorbs the hydrophilic group of the organic compound. Therefore, a more stable lubricating oil film is formed between the metal plate to be molded and the tool. As a result, the coefficient of friction can be reduced and the life of the tool can be extended.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

(Example 1)
As the pin corresponding to the tool in Example 1, a hydrogen-terminated diamond film is formed by a chemical vapor deposition (CVD) method using a gas containing hydrogen in a cemented carbide (tungsten carbide) specified in Japanese Industrial Standards. Was used. The surface roughness Ra of the hydrogen-terminated diamond coating is 0.03 μm after polishing.

Further, as the disk corresponding to the metal plate to be molded in Example 1, a disk made of GA material was used.

Further, as the lubricating oil forming the lubricating oil film in Example 1, Airlube S-33KT manufactured by Kyodo Yushi Co., Ltd. (composition: 100% ester (natural fat (vegetable oil) + synthetic ester oil (having hydroxyl group and carboxyl group)) It is composed of an organic compound. The content of the organic compound in the lubricating oil is 10% by mass.)), The viscosity (40 ° C.): 33 mm ² / s) was used.

(Example 2)
The same disc as in Example 1 was used except that the disc made of Al material was used instead of the disc made of GA material in Example 1.

(Example 3)
The same disk as in Example 1 was used except that the disk made of Steel material was used instead of the disk made of GA material in Example 1.

(Example 4)
Instead of the lubricating oil in Example 1, mineral oil was added to Airlube S-33KT manufactured by Kyodo Yushi Co., Ltd. (composition: mineral oil; 30-50%, ester; 50-70% (natural fat (vegetable oil) + synthetic) Except for the use of ester oil (consisting of an organic compound having a hydroxyl group and a carboxyl group. The content of the organic compound in the lubricating oil is 5% by mass), viscosity (40 ° C.): 33 mm ² / s). Used the same as in Example 1.

(Example 5)
Instead of the lubricating oil in Example 2, mineral oil was added to Airlube S-33KT manufactured by Kyodo Yushi Co., Ltd. (composition: mineral oil; 30-50%, ester; 50-70% (natural fat (vegetable oil) + synthetic) Except for the use of ester oil (consisting of an organic compound having a hydroxyl group and a carboxyl group. The content of the organic compound in the lubricating oil is 5% by mass), viscosity (40 ° C.): 33 mm ² / s). Used the same as in Example 2.

(Example 6)
Instead of the lubricating oil in Example 3, mineral oil was added to Airlube S-33KT manufactured by Kyodo Yushi Co., Ltd. (composition: mineral oil; 30-50%, ester; 50-70% (natural fat (vegetable oil) + synthetic) Except for the use of ester oil (consisting of an organic compound having a hydroxyl group and a carboxyl group. The content of the organic compound in the lubricating oil is 5% by mass) and viscosity (40 ° C.): 33 mm ² / s). , The same as in Example 3 was used.

(Comparative Example 1)
The same as in Example 1 was used except that the lubricating oil in Example 1 was not used. That is, it is a non-lubricated state (dry state) in which no lubricating oil is used.

(Comparative Example 2)
Instead of the pins in Example 1, the same pins as in Example 1 were used except that the pins made of high carbon chromium bearing steel (SUJ2) specified in the Japanese Industrial Standards were used. That is, it does not form a hydrogen-terminated diamond coating.

(Comparative Example 3)
Instead of the pins in Example 3, the same pins as in Example 3 were used except that the pins made of high carbon chromium bearing steel (SUJ2) specified in the Japanese Industrial Standards were used. That is, it does not form a hydrogen-terminated diamond coating.

(Comparative Example 4)
Instead of the pins in Example 4, the same pins as in Example 4 were used except that the pins made of high carbon chromium bearing steel (SUJ2) specified in the Japanese Industrial Standards were used. That is, it does not form a hydrogen-terminated diamond coating.

(Comparative Example 5)
Instead of the pin in Example 6, the same pin as in Example 6 was used except that the pin made of high carbon chromium bearing steel material (SUJ2) specified in the Japanese Industrial Standards was used. That is, it does not form a hydrogen-terminated diamond coating.

[Performance evaluation]
Friction characteristics were evaluated for the combinations of pins, discs and lubricating oils in each of the above examples. The pin-on-disc method was used for the friction test. FIG. 4 is a perspective view illustrating an outline of the friction test. As shown in FIG. 4, the pin P was slid on the disc D as indicated by the arrow Y in the figure. Further, as shown in FIG. 4, the load indicated by the arrow Z in the figure was applied. The load is 5N, the surface pressure is 50MPa, and the peripheral speed of the pin is 0.3m / s. Further, 10 μL of the lubricating oil was dropped before the test. Further, the test was carried out at room temperature (25 ° C.). Considering the initial familiar effect, the measured value at 5 minutes after the start of the test was regarded as the coefficient of friction of the combination. FIG. 5 shows a part of the specifications of each example and the obtained results.

FIG. 5 is a graph showing the friction coefficient (μ) of each example. From FIG. 5, in Examples 1 to 6 belonging to the scope of the present invention, the coefficient of friction between the metal plate to be molded and the tool is reduced as compared with Comparative Examples 1 to 5 outside the present invention. I understand. This makes it possible to extend the life of the tool.

Further, FIG. 6 is an atomic force microscope (AFM) photograph showing the results of observing the surface shape of the sliding portion of the tool in Example 1 with an atomic force microscope (AFM). From FIG. 6, relatively large irregularities were observed on the surface of the sliding portion of the tool, and it was confirmed that the lubricating oil containing the organic compound having a hydrophilic group was not adsorbed.

On the other hand, FIG. 7 is an optical micrograph showing the result of observing the surface shape of the metal plate to be molded in Example 1 with an optical microscope. Further, FIG. 8 is an atomic force microscope (AFM) photograph showing the results of observing the surface shape of the metal plate to be molded in Example 1 with an atomic force microscope (AFM). From FIGS. 7 and 8, no large unevenness was observed on the surface of the metal plate to be molded, and it was confirmed that the adsorption film was formed by adsorbing the hydrophilic groups of the organic compound having hydrophilic groups on the metal plate to be molded. did it.

That is, in Example 1 and further, Examples 2 to 6 have an adsorption film formed by adsorbing a hydrophilic group in an organic compound to a metal plate to be molded, so that the metal to be molded is formed. It is also considered that the coefficient of friction between the plate and the tool is reduced.

Further, in Examples 1 to 6, since the hydrophilic group in the organic compound contains a hydroxyl group and a carboxyl group, it is considered that the coefficient of friction between the metal plate to be molded and the tool is reduced.

Further, in Examples 1 to 6, the content ratio of the organic compound in the lubricating oil is 5% by mass or more. Therefore, in Examples 1 and 3, the content ratio of the organic compound in the lubricating oil is 10% by mass. Since it is% or more, it is considered that the coefficient of friction between the metal plate to be molded and the tool is reduced.

Further, in Examples 1 to 6, since the surface roughness Ra of the coating film made of diamond in the tool is 0.13 μm or less, the coefficient of friction between the metal plate to be molded and the tool is reduced. You might also say that.

Further, in Examples 1 to 6, the metal plate to be molded is composed of magnesium, aluminum, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, zinc, yttrium, zirconium, molybdenum, lanthanum and tungsten. It is also considered that the friction coefficient between the metal plate to be molded and the tool is reduced because it contains at least one selected.

Further, in Examples 1 and 4, since the metal plate to be formed is a galvanized steel plate such as an alloyed hot-dip galvanized steel plate, the coefficient of friction between the metal plate to be formed and the tool is reduced. You might also say that.

Further, in Examples 2 and 5, since the metal plate to be molded is an aluminum alloy plate, it is considered that the coefficient of friction between the metal plate to be molded and the tool is reduced.

Further, in Examples 3 and 6, since the metal plate to be formed is a steel plate, it is considered that the coefficient of friction between the metal plate to be formed and the tool is reduced.

Although the present invention has been described above with reference to some embodiments and examples, the present invention is not limited thereto, and various modifications can be made within the scope of the gist of the present invention.

1 Sliding mechanism
10 Tool 10a Sliding part 11 Coating 20 Lubricating oil film 21 Lubricating oil 23 Organic compound 231 Hydrophilic group 25 Adsorption film 30 Metal plate to be molded 50 Fixture 51 Fixture 53 Movable tool P pin D disk

Claims (5)

A sliding mechanism used in sequential molding,
The sliding mechanism includes a metal plate to be molded and a tool for pressure molding the metal plate to be molded via a lubricating oil film.
The tool has at least a hydrogen-terminated diamond coating on the surface of the sliding part.
The lubricating oil film contains a lubricating oil containing a higher fatty acid monoglyceride and / or a diglyceride having a hydroxyl group and / or a carboxyl group .
The metal plate to be molded is a galvanized steel plate.
A sliding mechanism characterized by that. The lubricating oil film is characterized by having an adsorption film formed by adsorbing the hydroxyl group and / or the carboxyl group in the higher fatty acid monoglyceride and / or the diglyceride to the metal plate to be molded. The sliding mechanism described in 1. The sliding mechanism according to claim 1 or 2, wherein the content ratio of the higher fatty acid monoglyceride and / or diglyceride in the lubricating oil is 5% by mass or more. The sliding mechanism according to any one of claims 1 to 3, wherein the surface roughness Ra of the diamond coating in the tool is 0.13 μm or less. When sequentially molding a metal plate to be molded using a tool and lubricating oil, the metal plate to be molded, a tool for pressure-molding the metal plate to be molded via a lubricating oil film formed by the lubricating oil, and a tool. It is a sequential molding method using a sliding mechanism equipped with
The tool has at least a hydrogen-terminated diamond coating on the surface of the sliding part.
The lubricating oil contains a higher fatty acid monoglyceride and / or a diglyceride having a hydroxyl group and / or a carboxyl group .
The metal plate to be molded is a galvanized steel plate.
A sequential molding method characterized by the fact that.

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