JP7075055B2 - Drawing equipment and drawing method - Google Patents

Description

The present disclosure relates to a drawing machine and a drawing method.

As a metal processing method, various processing methods have been conventionally proposed.
For example, press working can be mentioned. Pressing is a process in which a blank material such as metal is sandwiched between a pair of tools including a die and pressure is applied to the blank material in the direction of the die to process the blank material into the shape of a die. The method.
Drawing is known as a type of press working. Drawing is a type of metal plate forming method. As shown in FIG. 7, a processing method for forming a bottomed container having various shapes such as a cylinder, a square cylinder, and a cone by using a single metal plate as a blank material. Is. By using drawing processing, it is possible to form a seamless container-shaped metal.

Examples of the metal used in the drawing method include titanium, titanium alloy, aluminum, iron, stainless steel, copper, magnesium and the like. Among them, metals having properties such as high corrosion resistance, high strength, and low specific density, such as titanium and titanium alloys, are expected to be applied in a wide range of fields, and various studies have been made on their processing.

For example, Patent Document 1 is characterized in that a titanium alloy material is set in a die heated and held at 700 ° C. to 1000 ° C. in the atmosphere and then immediately forged at a speed of 20 mm / min or less. The molding method of the alloy product is described.

Japanese Unexamined Patent Publication No. 6-142810

Chemically active metals (eg, titanium, titanium alloys, etc.) may adhere to the mold during press working.
Conventionally, in order to suppress the above-mentioned adhesion, studies have been conducted on a method of using a mold with various coatings and a lubricant in combination, a method of applying a nitriding treatment or an oxidation treatment to a metal, and the like. Suppression has not yet been resolved.

When the present inventor processes the contact surface between the mold and the metal under high pressure, sliding occurs on the contact surface between the mold and the metal, and this sliding is one of the causes of the above-mentioned adhesion. I found that there is.
Patent Document 1 assumes forging of a specific product, and it is considered that forging of the specific product is performed in a situation where sliding between the mold and the metal is unlikely to occur in the first place, and is described in Patent Document 1. It is presumed that the applicable range of the forming method for titanium alloy products is very limited.

An object to be solved by the embodiment of the present disclosure is to provide a drawing machine and a drawing method capable of suppressing adhesion of a metal to a mold.

Conventionally, in the drawing process of metal using a press, there has been a problem that metal (particularly pure titanium, titanium alloy, etc.) adheres to the die. Research on the combined use of various coated molds and lubricants for the purpose of preventing adhesion, and research on the combined use of various coated molds and lubricants on metal that has been subjected to nitriding or oxidation treatment. However, it is still difficult to suppress metal adhesion.

The present inventor considered that the sliding of the mold and the metal as a blank material under high surface pressure conditions is the main cause of the metal sticking to the mold, and created the present invention.

The drawing machine, which is the first invention for achieving the above object, is
<1> A blank support that supports the blank material by applying pressure to at least a part of the mold and the surface of the blank material opposite to the surface in contact with the mold, which is arranged in the mold via the blank material. A pressing member that deforms the blank material by pressing a part of the surface opposite to the surface of the blank material that is in contact with the mold, and the blank support material at 2 Hz in a direction parallel to the movable direction of the pressing member. It is provided with a vibration generating means for applying a vibration of about 8 Hz and a compressed gas supplying means for supplying the compressed gas to the inside of the mold.

By applying vibration of a specific frequency to the blank support material, the contact time between the blank material and the mold is reduced. As a result, the duration of sliding, which is the cause of adhesion, can be shortened. Further, by applying vibration of a specific frequency to the blank support material, it is possible to secure a space for the compressed gas to be sent between the blank material and the mold. By supplying the compressed gas to the secured space, it is possible to suppress the impact caused by the vibration of the blank support material due to the collision between the blank material and the mold. As a result, it is possible to reduce the adhesion of the blank material to the mold.
The metal surface may be coated with an oxide film such as atmospheric oxidation or anodizing for the purpose of protecting the metal surface, for example. The drawing device of the present disclosure is also excellent in the effect of suppressing peeling of the oxide film applied to the metal surface by different methods such as atmospheric oxidation and anodizing. As a result, the effect of suppressing the adhesion of the metal having the oxide film to the mold becomes excellent.

<2> In <1>, the pressing member has a circular cross-sectional shape orthogonal to the movable direction, and the blank material has a circular surface shape parallel to a plane orthogonal to the movable direction. Under the condition that the ratio of the diameter of the blank material to the diameter of the pressing member is 2 or more, the gold after the drawing process is completed for the area of the measurement surface satisfying the following formula 1 which is arbitrarily selected for all the surfaces in the bent portion of the mold. The ratio of the total area of the portions where the blank material of the mold is adhered can be 0.2% or less.
Area of measurement surface = Y × 0.75Y (Equation 1)
In Equation 1, Y represents the width length (mm) of the bent portion in the direction orthogonal to the circumferential direction of the mold.
In the present disclosure, the bent portion refers to a bent region between the side wall 5E of the hole 5C of the mold and the surface 5B with which the blank material comes into contact, as shown in FIG.

<3> In <1> or <2>, pure titanium or a titanium alloy can be preferably mentioned as the blank material. Among them, pure titanium tends to cause adhesion.
According to one embodiment of the present disclosure, even when pure titanium, which easily causes adhesion, is used as a blank material, an excellent effect can be obtained.

<4> In <1> to <3>, the temperature of the compressed gas is preferably −15 ° C. to 25 ° C. During drawing molding, frictional heat is generated between the metal and the mold, and this frictional heat promotes adhesion. By setting the gas temperature to -15 ° C to 25 ° C, the frictional heat is suppressed. However, adhesion can be further suppressed.

<5> In <1> to <4>, the pressure of the compressed gas can be 0.2 MPa to 0.8 MPa. This makes it possible to satisfactorily suppress the occurrence of wrinkles in the molded product.

<6> In <1> to <5>, the blank material is preferably a material whose surface is oxidized. For example, a blank material that is atmospherically oxidized at a temperature of 500 ° C. to 600 ° C. or anodized at a voltage of 15V to 60V is preferable. The blank material can be protected by the oxide film applied to the blank material. However, in one embodiment of the present disclosure, peeling of the oxide film applied to the surface of the blank material can be suppressed, so that the blank material can be protected. It is possible to further suppress the adhesion of.

<7> The drawing processing method according to the second invention includes a step of arranging the blank material between the blank support material and the die, and a direction parallel to the movable direction of the pressing member with respect to the blank support material. The blank material is supported by applying a vibration of 2 Hz to 8 Hz, supplying compressed gas to the inside of the mold, and applying pressure to the blank material by the blank support material to support the blank material. The present invention includes a step of pressing at least a part of a surface opposite to the surface in contact with the mold with the pressing member to deform the blank material.

<8> As the drawing method, the drawing can be performed using the drawing device according to any one of <1> to <6>.

According to the present disclosure, it is possible to provide a drawing device and a drawing method capable of suppressing adhesion of a metal to a mold.

It is a schematic diagram which shows one Embodiment of the drawing processing apparatus of this disclosure. It is sectional drawing of the mold for demonstrating the place where drawing is performed using the drawing apparatus or drawing method in this disclosure. It is sectional drawing which shows an example of the mold in this disclosure. It is a figure which shows an example of the blank support material in this disclosure. It is a figure which shows an example of the pressing member in this disclosure. It is sectional drawing which shows an example of the molded body in this disclosure. It is sectional drawing of the mold for demonstrating the place where a blank material is drawn by the drawing method which has been conventionally used.

Hereinafter, embodiments of the drawing machine and the drawing method of the present disclosure will be specifically described with reference to FIGS. 1 to 6. However, the present disclosure is not limited to the embodiments shown below.

As shown in FIG. 1, the drawing device 100 includes a die 5, a blank support member 7, a pressing member 9, a vibration generating means 1, and a compressed gas supplying means 3.

As shown in FIG. 3, the mold 5 has a hole 5C inside, and has a bent portion 5D at the open end on the side where the blank material is arranged so as to be in contact with the mold 5 of the hole 5C. can. The blank material 11 arranged so as to be in contact with the mold 5 can be processed into a molded body having a desired shape by squeezing the blank material 11 along the hole 5C using the pressing member 9.
In drawing, adhesion is most likely to occur in the bent portion 5D.
Various shapes of the molded body can be selected depending on the shape of the holes in the mold 5. Examples of the shape of the hole of the mold 5 in the present disclosure include a conical shape, a pyramid shape, a cylindrical shape, a square cylinder shape, and the like.
The material of the mold 5 is not particularly limited, and examples thereof include SKD11, SKD61, and cemented carbide.

The blank support material 7 has holes 7A as shown in FIG. 4, and supports the blank material 11 when the blank material 11 is arranged between the blank support material 7 and the mold 5 as shown in FIG. Further, pressure is applied to at least a part of the surface of the blank material 11 opposite to the surface in contact with the mold 5. This makes it possible to suppress the occurrence of wrinkles in the molded product.
Since the blank support member 7 has a hole 7A for the pressing member 9 to pass through, the pressing member 9 passes through the hole 7A and presses the blank material 11 to perform drawing.

The force (BHF: Blank Holding Force) exerted by the blank support material 7 on the blank material 11 can be appropriately adjusted depending on the material, dimensions, etc. of the blank material 11, but 200 N to 500 N is preferable. When the BHF is 200 N or more, wrinkles generated in the blank material 11 can be satisfactorily suppressed. When the BHF is 500 N or less, the surface pressure between the blank material and the mold 5 can be suppressed, and the amount of adhesion can be reduced. In addition, cracks generated in the blank material 11 can be satisfactorily suppressed.
From the above viewpoint, in the blank material 11 which is the subject of the present disclosure, the BHF is more preferably 220N to 450N, further preferably 230N to 420N.

As shown in FIG. 4, the blank support member 7 can have a cylindrical shape having holes 7A inside.
It is desirable that the outer diameter 7R of the blank support material 7 has the same size as that of the blank support material 7.
The inner diameter 7r of the blank support member 7 is preferably a value that does not obstruct the passage of the pressing member 9 passing through the inner diameter 7r.
The thickness 7h of the blank support material 7 is not particularly limited, but may be, for example, 1 cm to 10 cm.
The material of the blank support material 7 is not particularly limited, and examples thereof include SKD11, SKD61, and cemented carbide.

As shown in FIG. 5, the pressing member 9 may have a substantially cylindrical shape, for example, may have a body portion 9B, and the body portion 9B may be provided with a pressing surface 9A for pressing the blank material 11. As shown in FIG. 2, the pressing member 9 applies a vibration of 2 Hz to 8 Hz to the blank support member 7 in a direction parallel to the movable direction of the pressing member 9, and supplies compressed gas to the inside of the mold 5. , A part of the surface of the blank material 11 opposite to the surface in contact with the mold 5 is pressed while pressure is applied to at least a part of the surface of the blank material 11 opposite to the surface in contact with the mold 5. This is for processing the blank material 11 by squeezing it along the hole 5C of the mold 5.

The material of the pressing member 9 is not particularly limited, and examples thereof include SKD11, SKD61, and cemented carbide.

The shape of the pressing member 9 can be appropriately selected according to the shape of the desired molded body. For example, a cylindrical shape, a square cylinder shape, and the like can be mentioned.

The speed (punch speed) when the pressing member 9 presses the blank material 11 and the maximum value of the load (maximum punch load) can be appropriately adjusted depending on the sliding characteristics, deformation characteristics, and the like of the blank material 11.

The maximum value (maximum punch load) of the load when the pressing member 9 presses the blank material 11 can be appropriately adjusted depending on the film thickness of the oxide film of the blank material 11, the processing conditions, and the like.

As shown in FIG. 2, the vibration generating means 1 is for applying vibrations having the following frequencies to the blank support member 7 in a direction parallel to the movable direction of the pressing member 9.
The frequency is 2 Hz to 8 Hz in the case of a low frequency. Further, in the case of high frequency, the frequency is preferably 50 kHz to 70 kHz.
As a result, the contact time between the blank material 11 and the mold 5 is reduced, and adhesion can be suppressed. Further, it is possible to secure a space between the blank material 11 and the mold 5 for the compressed air to be smoothly sent.
The reason why the above space can be secured is presumed as follows.
That is, when the drawing is performed, the load portion by the pressing member 9 is applied with a force in the direction of being pushed into the mold 5, so that the portion to which the pressure is applied by the blank support material is substantially opposite to the inside of the mold 5. It is considered that the urging force generated by the blank material 11 itself works. From this point, it is considered that the space between the mold 5 and the blank material 11 can be satisfactorily secured by applying vibration to the blank support material.

The frequency generated by the vibration generating means 1 is 2 Hz to 8 Hz in the case of a low frequency. When the frequency is 2 Hz or higher, the contact time per vibration can be reduced, so that the sliding of the blank material 11 with respect to the mold 5 can be suppressed. When it is 8 Hz or less, it can be processed while maintaining an appropriate BHF for suppressing wrinkles.
From the above viewpoint, the frequency is preferably 4 Hz to 8 Hz.
Further, in the case of high frequency, the frequency is preferably 50 kHz to 70 kHz, more preferably 55 kHz to 65 kHz, and further preferably 58 kHz to 62 kHz.

Further, by setting the frequency generated by the vibration generating means 1 to 2 Hz to 8 Hz, in addition to the above effects, drawing can be performed using a simpler device.
From the same viewpoint as above, it is preferable that the frequency generated by the vibration generating means 1 is 4 Hz to 8 Hz.

The vibration generating means 1 is not particularly limited as long as it can apply the above vibration to the blank support material, but for example, a servo motor, a hydraulic pump, a vibration generator (for example, a vibrator, a standing wave generator) or the like can be used. A means for vibrating the blank support member 7 can be mentioned. Specifically, a servomotor that moves the blank support member in a direction parallel to the movable direction of the pressing member is provided, and the blank support member can be vibrated at the above-mentioned frequency by the servomotor.

In particular, when a relatively high frequency (for example, 58 kHz to 62 kHz) is applied, it is preferable to vibrate using a vibration generator (for example, a vibrator, a standing wave generator, etc.).

As shown in FIGS. 1 and 2, the compressed gas supply means 3 is for supplying the compressed gas to the inside of the mold 5. As a result, the compressed gas is sent into the space between the mold 5 and the blank material 11 generated by the vibration generating means 1, and the impact caused by the vibration of the blank support material 7 due to the collision between the metal and the mold 5 is suppressed. It is possible to reduce the adhesion of the metal to the mold 5.

The temperature of the compressed gas is preferably low. The frictional heat generated between the blank material 11 and the mold 5 during drawing is considered to promote the adhesion of the blank material 11 to the mold 5, and the temperature of the compressed gas is low, so that the above-mentioned It can take away frictional heat and suppress adhesion better.
In the present application, the low temperature refers to a temperature of 50 ° C. or lower.
Specifically, the temperature of the compressed gas is preferably −15 ° C. to 50 ° C.
When the temperature of the compressed gas is −15 ° C. or higher, the moisture in the gas that hinders sliding can be removed, and heat generation due to friction generated between the blank material 11 and the mold 5 can be suppressed.
From the above viewpoint, the temperature of the compressed gas is more preferably −15 ° C. to 25 ° C.
The temperature of the compressed gas can be measured using, for example, a thermometer (for example, a waterproof personal thermometer manufactured by AS ONE Corporation).

The atmospheric pressure of the compressed gas can be appropriately adjusted by the blank material 11, but is preferably 0.1 MPa to 1.5 MPa.
When the atmospheric pressure of the compressed gas is 0.1 MPa or more, adhesion can be satisfactorily suppressed. When the atmospheric pressure of the compressed gas is 1.5 MPa or less, precise moldability can be maintained.
From the above viewpoint, the atmospheric pressure of the compressed gas is more preferably 0.1 MPa to 1.0 MPa, further preferably 0.2 MPa to 0.8 MPa.
The atmospheric pressure of the compressed gas can be measured using, for example, a pressure gauge (for example, a normal pressure gauge, manufactured by Nagano Keiki Co., Ltd.).

The compressed gas supply means 3 is not particularly limited as long as it can supply the above-mentioned compressed gas to the inside of the mold 5, but for example, the gas is compressed to a desired atmospheric pressure by using a compressor, and the compressed gas is gold. Means for supplying to the inside of the mold 5 can be mentioned.

As shown in FIG. 2, the blank material 11 is a material for forming a desired molded product by being processed by pressing with a pressing member 9.
As the shape of the blank material 11 in the present disclosure, for example, a circular flat plate shape can be used.

The blank material 11 in the present disclosure is not particularly limited, but a metal can be used. Of these, pure titanium, titanium alloy, aluminum or stainless steel is preferable, pure titanium or titanium alloy is more preferable, and pure titanium is even more preferable, from the viewpoint that adhesion is likely to occur and the problem of the present application becomes apparent.

The blank material 11 may have an oxide film on its surface. Thereby, the blank material 11 can be protected and the adhesion can be suppressed more satisfactorily.
As a method of applying an oxide film to the blank material 11, a known method can be used. For example, methods such as atmospheric oxidation and anodizing can be mentioned.
Atmospheric oxidation is, for example, an oxide film forming method for forming an anatase-type oxide film on a metal surface by oxygen in the air in a furnace at a constant temperature.
Anodizing is a method of forming an oxide film by energizing a metal as an anode to form a rutile-type oxide film on the metal surface on the anode side.
In the present disclosure, atmospheric oxidation is preferable from the viewpoint of suppressing adhesion.
From the viewpoint that the problems of the present application become more apparent and the effects of the drawing apparatus of the present disclosure are more clearly exhibited, anodizing that forms a relatively weak oxide film is preferable. In other words, even with anodizing that forms a relatively weak oxide film, when the drawing processing device of the present disclosure is used, peeling of the oxide film is satisfactorily prevented and adhesion of the blank material 11 is suppressed. can.

When the blank material 11 has a circular flat plate shape and the pressing member 9 has a cylindrical shape, the ratio of the diameter (D) of the blank material 11 to the diameter (d) of the pressing member 9 (aperture ratio: D / d). ) Is 2.0 or more, it is easy to obtain practicality in general industry. The larger the value of D, that is, the larger the drawing ratio, the more easily the molded product is broken by one drawing, and the drawing ratio can be an index of the drawing property of the material.

One embodiment of a molded body manufactured using the drawing apparatus of the present disclosure is, for example, a substantially cylindrical molded body in which one is closed and the other is an open opening, as shown in FIG. A flange portion 11G extending from the peripheral edge of the portion to the outside of the outer wall of the cylinder can be provided, and a bent portion 11H which is a bent portion can be provided between the peripheral edge of the opening portion and the flange portion 11G.

In the drawing apparatus of the present disclosure, the pressing member 9 has a circular cross-sectional shape orthogonal to the movable direction, and the blank material 11 has a circular surface shape parallel to the plane orthogonal to the movable direction. Under the condition that the ratio of the diameter of the blank material 11 to the diameter of 9 is 2 or more, the drawing process is completed for the area of the measurement surface satisfying the following formula 1 arbitrarily selected for all the surfaces in the bent portion 5D of the mold 5. It is preferable that the ratio of the total area of the portions where the blank material 11 is adhered to the latter mold is 0.2% or less.
Area of measurement surface = Y × 0.75Y (Equation 1)
In Equation 1, Y represents the width length (mm) of the bent portion 5D in the direction orthogonal to the circumferential direction of the mold.

From the viewpoint of suppressing adhesion, the ratio of the area of the portion where the blank material 11 of the mold 5 is adhered to the area of the measurement surface satisfying the above formula 1 is more preferably 0.13% or less.

Next, the drawing processing method of the present disclosure will be described in detail.

The drawing processing method of the present disclosure includes a step of arranging the blank material 11 between the blank support material 7 and the die 5, and 2 Hz to 2 Hz in a direction parallel to the movable direction of the pressing member 9 on the blank support material 7. A vibration of 8 Hz is applied, compressed gas is supplied to the inside of the mold 5, and pressure is applied to at least a part of the surface of the blank material 11 opposite to the surface in contact with the mold 5. The present invention includes a step of pressing a part of the surface of the blank material 11 opposite to the surface in contact with the mold 5 with the pressing member 9 to deform the blank material 11.

As the drawing processing method of the present disclosure, the drawing processing apparatus according to the present disclosure may be used.

An embodiment of the drawing method of the present disclosure will be described with reference to FIGS. 1 and 2.
First, the blank material 11 is arranged between the blank support material 7 and the mold 5 shown in FIG.
As shown in FIG. 1, when the blank material 11 is arranged on the blank support material 7, when the blank support material 7 is driven by the servomotor and moves closer to the mold 5, the blank material 11 becomes the mold 5. It is arranged so as to be sandwiched between the blank support material.

Next, as shown in FIG. 2, the blank support member 7 is subjected to a vibration of 2 Hz to 8 Hz in a direction parallel to the movable direction of the pressing member 9, and a compressed gas is supplied to the inside of the mold 5 to supply the compressed gas. The member 9 presses a part of the surface of the blank material 11 opposite to the surface of the blank material 11 in contact with the mold 5 while applying pressure to at least a part of the surface of the blank material 11 opposite to the surface of the blank material 11 in contact with the mold 5. Press with to deform the blank material 11.

Specifically, for example, as shown in FIG. 2, pressure is applied to, for example, the scrap portion 13 on the surface of the blank material 11 opposite to the surface in contact with the mold 5. Then, after supplying compressed gas from one end of the hole 5C of the mold 5 into the mold 5 by, for example, a compressor, the vibration generating means 1 (for example, a servomotor) 2 Hz in the direction parallel to the movable direction of the pressing member 9. A vibration of ~ 8 Hz is applied to the blank support material 7.

Then, by moving the pressing member 9 in the above state, the pressing member 9 passes through the hole 7A of the blank support material 7 toward the blank material 11 and is opposite to the surface of the blank material 11 in contact with the mold 5. A part of the surface (for example, the inner bottom surface 11D in FIG. 6) can be pressed. As a result, the blank material 11 is bent as the inner bottom surface 11D advances in the hole 5C of the mold 5, and the inner bottom surface 11D is pushed into the mold 5.
When the inner bottom surface 11D is pushed to a desired position, the processing of the blank material 11 is completed.

In the drawing method of the present disclosure, the blank material 11 can be formed into various shapes by applying processing other than the above.

Hereinafter, the present disclosure will be described in more detail with reference to Examples, but the present disclosure is not limited to the following Examples as long as the gist of the present disclosure is not exceeded. Unless otherwise specified, "part" is based on mass.

(Example 1)
Using the drawing device having the structure shown in FIG. 1, the blank material 11 (pure titanium, atmospheric oxidation) was drawn by the above-mentioned drawing method. At this time, when the flange portion 11G of the obtained molded body is arranged so as to be in contact with the horizontal surface, the inner bottom surface 11D is set to a position where the length from the horizontal plane to the outer bottom surface 11A (11h in FIG. 6) is 10 mm. At the stage of pushing in, the processing of the blank material 11 was completed, and a molded body was manufactured.
The diameter of the blank material 11, the oxide film, the BHF, the punch speed, the maximum punch load, the frequency, the atmospheric pressure of the compressed gas, the temperature of the compressed air, and the drawing ratio in the drawing process are as shown in Table 1.

The outer shape of the mold 5 used is a cylindrical shape with an outer diameter of 5R: 40 mm × a height of 5h: 10 mm when the mold is arranged on a horizontal surface as shown in FIG. 3, and the inner diameter 5r of the hole 5C is 11 mm. Met. Further, the width length Y of the bent portion in the direction orthogonal to the circumferential direction of the mold 5 was 2.5 mm.
The outer shape of the blank support material 7 used was a cylindrical shape having an outer diameter of 40 mm and a height of 10 mm, and the inner diameter of the hole 7A was 11 mm.

The outer shape of the pressing member used was a cylindrical shape having a circular pressing surface having a diameter (d) of 9.5 mm and a body portion having a length of 60 mm.

The blank material 11 used is a circular flat plate-shaped pure titanium (thickness 500 μm) having an oxide film formed on the surface by atmospheric oxidation. The diameter (D) of the cylindrical circular surface was 19 mm.
Further, the ratio (drawing ratio: D / d) of the diameter (D) of the blank material 11 to the diameter (d) of the pressing member was 2.0.

The obtained molded body has an outer bottom surface diameter of 11 mm, and when the molded body is arranged on a horizontal surface as shown in FIG. 6, the vertical height 11h from the horizontal surface to the outer bottom surface is 11 mm. there were.

(Examples 2 to 8, Comparative Examples 1 to 8)
For Examples 2 to 8 and Comparative Examples 1 to 8, as shown in Table 1, the diameter of the blank material 11, the oxide film, the BHF, the punch speed, the frequency, the atmospheric pressure of the compressed gas, the temperature of the compressed gas, A molded body was manufactured in the same manner as in Example 1 except that the drawing ratio was changed.

(Evaluation of adhesion suppression)
Adhesion suppression was evaluated by observing the bent portion of the mold 5 after drawing with a microscope.
The microscope observed the bent portion from a position tilted by 30 ° in the hole 5C direction with respect to the extension line of the inner side surface when viewed from the inner bottom surface side of the mold 5. While moving the measurement position of the microscope in the circumferential direction by the area of the measurement surface (2.3 mm ² ) obtained by the following formula 1, observe the entire area of the bent portion, and mold 5 with respect to the area of the measurement surface. The ratio (%) of the area of the portion where the blank material 11 adhered was calculated.
Area of measurement surface = Y × 0.75Y (Equation 1)
In Equation 1, Y represents the length (mm) of the bent portion in the direction orthogonal to the circumferential direction of the mold 5.
The calculated ratio was evaluated according to the following criteria, and the evaluation results are shown in Table 1.

-Evaluation criteria-
A: The ratio of the area of the portion where the blank material 11 of the mold 5 adhered to the area of the measurement surface was 0.20% or less.
B: The ratio of the area of the portion where the blank material 11 of the mold 5 adhered to the area of the measurement surface was more than 0.20% and 0.35% or less.
C: The ratio of the area of the portion where the blank material 11 of the mold 5 adhered to the area of the measurement surface was more than 0.35% and 0.50% or less.
D: The ratio of the area of the portion where the blank material 11 of the mold 5 adhered to the area of the measurement surface was more than 0.50% and 0.75% or less.
E: The ratio of the area of the portion where the blank material 11 of the mold 5 adhered to the area of the measurement surface was more than 0.75%.

(Evaluation of formability)
The presence or absence of wrinkles and the state of wrinkles in the molded products manufactured in Examples 1 to 8 and Comparative Examples 1 to 8 were visually inspected and evaluated based on the following evaluation criteria, and the evaluation results are shown in Table 1. Described.
-Evaluation criteria-
A: No defects such as wrinkles and cracks were observed, and no peeling of the oxide film was observed on the surface of the molded product.
B: No defects such as wrinkles and cracks were observed, but the surface of the molded product had peeling of the oxide film, scratches, etc., and the appearance was inferior.
C: Wrinkles were observed, and one wrinkle having a length of more than 2 mm accounted for half of the wrinkles, and the wrinkles were remarkable and the appearance quality was inferior. Or, cracks were found.

In Examples 1 to 8 using the drawing processing device having the vibration generating means 1 and the compressed gas supply means, the suppression of adhesion was good. Further, under the condition that the ratio of the diameter of the blank material 11 to the diameter of the pressing member was 2 or more, adhesion was satisfactorily suppressed in Examples 1 to 8.
In Examples 1 to 8 in which the blank material 11 is pure titanium or a titanium alloy, adhesion was satisfactorily suppressed.
Among them, Examples 1 to 7 in which the temperature of the compressed gas was −15 ° C. to 25 ° C. showed better adhesion suppressing property.
Examples 1 to 8 in which the pressure of the compressed gas was 0.2 MPa to 0.8 MPa showed more excellent adhesion suppressing property.
On the other hand, Comparative Examples 1 to 4 having no compressed gas supply means were inferior in the adhesion suppressing property. Further, Comparative Example 5 and Comparative Example 6 in which the vibration generating means was not used were inferior in the adhesion suppressing property. Comparative Example 7 and Comparative Example 8 in which the frequency was not in the range of 2 Hz to 8 Hz were inferior in the adhesion inhibitory property.

100 ... Drawing device 1 ... Vibration generating means 3 ... Compressed gas supply means 5 ... Mold 5A ... Top surface 5B ... Bottom surface 5C ... Hole 5D (Y) ... Bent part 5E ... Side wall 5h ... Height 5R ... Outer diameter 5r ... Inner diameter 7 ... Blank support 7A ... Hole 7R ... Outer diameter 7r ... Inner diameter 7h ... Height 9 ... Pressing member 9A ... Pressing surface 9B ... Body 11 ... Blank material 11A ... Outer bottom surface 11B ... Outer surface 11C ... Outer end surface 11D ... Inner Bottom surface 11E ... Inner side surface 11F ... Inner end surface 11G ... Flange portion 11H ... Bending portion 11h ... Height 11R ... Diameter 13 ... Scrap portion

Claims (8)

With the mold
A blank support material which is arranged in the mold via a blank material and which supports the blank material by applying pressure to at least a part of the surface of the blank material opposite to the surface in contact with the mold.
A pressing member that deforms the blank material by pressing at least a part of the surface opposite to the surface of the blank material that is in contact with the mold.
A vibration generating means that applies vibration of 2 Hz to 8 Hz to the blank support material in a direction parallel to the movable direction of the pressing member.
A compressed gas supply means for supplying compressed gas to the inside of the mold,
A drawing device equipped with. The pressing member has a circular cross-sectional shape orthogonal to the movable direction, and the blank material has a circular surface shape parallel to a plane orthogonal to the movable direction.
Under the condition that the ratio of the diameter of the blank material to the diameter of the pressing member is 2 or more, the drawing process is completed for the area of the measurement surface satisfying the following formula 1 arbitrarily selected for all the surfaces in the bent portion of the die. The drawing machine according to claim 1, wherein the ratio of the total area of the portions of the later mold to which the blank material is adhered is 0.2% or less.
Area of measurement surface = Y × 0.5Y (Equation 1)
In Equation 1, Y represents the width length (mm) of the bent portion in the direction orthogonal to the circumferential direction of the mold. The drawing apparatus according to claim 1 or 2, wherein the blank material is pure titanium or a titanium alloy. The drawing apparatus according to any one of claims 1 to 3, wherein the temperature of the compressed gas is −15 ° C. to 25 ° C. The drawing apparatus according to any one of claims 1 to 4, wherein the pressure of the compressed gas is 0.2 MPa to 0.8 MPa. The drawing device according to any one of claims 1 to 5, wherein the blank material is a material whose surface is oxidized. The process of arranging the blank material between the blank support material and the mold,
A vibration of 2 Hz to 8 Hz is applied to the blank support material in a direction parallel to the movable direction of the pressing member, compressed gas is supplied to the inside of the mold, and the blank support material is applied to the blank material. A step of deforming the blank material by pressing at least a part of the surface of the blank material opposite to the surface in contact with the mold with the pressing member while the blank material is supported by applying pressure.
A drawing method having. A drawing method for drawing using the drawing device according to any one of claims 1 to 6.

Images