JP2021007956A - Press molding machine - Google Patents

Abstract

To provide a press molding machine that enables emission of air mixed into a pressure increase oil chamber and replenishment of the pressure increase oil chamber with a hydraulic oil while simplifying a hydraulic circuit.SOLUTION: A press molding machine 1 that operates with pressure of a hydraulic oil comprises: a pressure increase cylinder unit 10 having a cylinder 11, a piston 13, and a pressure increase oil chamber 20; an oil storage unit 50 storing a hydraulic oil for replenishment; a replenishment oil passage portion 52 that connects the pressure increase cylinder portion 10 and the oil storage unit 50; a replenishment oil passage opening/closing unit 53 that opens/closes the replenishment oil passage unit; and a control unit 100 that controls operations of a drive unit 2 and the replenishment oil passage opening/closing unit 53. The pressure increase oil chamber 20 is located lower than a bottom surface of the oil storage unit 50, and one end of the replenishment oil passage portion 52 is connected to the uppermost part of the pressure increase oil chamber 20. The other end of the oil replenishment passage portion 52 is connected to the bottom surface of the oil storage unit 50. When press molding is not carried out, the control unit 100 locates a piston 13 in a piston initial position and opens the replenishment oil passage portion 52.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a press molding machine.

Conventionally, there are a press molding machine provided with a mold clamping cylinder, a hydraulic oil supply source means for supplying pressurized hydraulic oil to the mold clamping cylinder, an electromagnetic control valve, an oil tank, and a movable die plate (for example, Patent Documents). 1). This press molding machine pressurizes the hydraulic oil stored in the oil tank and supplies the pressurized hydraulic oil to the forward oil chamber or the reverse oil chamber, which is the oil chamber of the mold clamping cylinder. , The movable die plate connected to the mold clamping cylinder is driven forward and backward to perform press molding.

Further, even if air is mixed in the oil chamber of the mold clamping cylinder, this press molding machine discharges the hydraulic oil from the oil chamber when the press molding is repeated, so that the air mixed in the oil chamber is combined with the hydraulic oil. Can be discharged to the oil tank.

Japanese Unexamined Patent Publication No. 10-58505

By the way, the hydraulic circuit of this press molding machine has a supply flow path for supplying the pressurized hydraulic oil to the forward oil chamber and a discharge flow path for discharging the hydraulic oil from the forward oil chamber. Then, when the press molding machine repeats press molding, the electromagnetic control valve switches the flow path connecting the oil tank and the advancing oil chamber to the supply flow path or the discharge flow path at a predetermined timing to advance. Supply and discharge hydraulic oil to the oil chamber. Therefore, the hydraulic circuit of the press molding machine tends to be complicated.

Therefore, the present inventors have studied the simplification of the hydraulic circuit in the press molding machine. Specifically, the inventors have described a pressure-increasing cylinder portion that pressurizes the hydraulic oil, a drive portion that supplies a driving force for pressurizing the hydraulic oil to the pressure-increasing cylinder portion, and a molding portion that press-molds the molding material. , A press molding machine equipped with a pressurized oil flow path portion connecting the pressure boosting cylinder portion and the molding portion was examined.

The pressure boosting cylinder provided in the press molding machine of the study example has a pressure boosting oil chamber and a piston into which hydraulic oil is lubricated in advance, and the piston is the hydraulic oil in the pressure boosting oil chamber by the driving force supplied from the drive unit. Is configured to pressurize. Further, in the molding portion provided in the press molding machine of the study example, the molding material can be filled inside the molding portion, and the pressurized hydraulic oil is supplied to the molding portion in the state where the molding material is filled. , The molding material can be press-molded by the pressure of hydraulic oil. Further, the press molding machine of the study example has a configuration in which hydraulic oil flows between the pressure boosting oil chamber and the molding portion via the pressurized oil flow path portion, and the hydraulic oil flows through the pressure boosting oil chamber and the molding portion. It is enclosed in.

In the press molding machine of the study example configured as described above, during press molding, the piston compresses the boosting oil chamber by the driving force supplied from the driving unit, and pressurizes the hydraulic oil in the boosting oil chamber. The pressurized hydraulic oil is supplied from the boosting oil chamber to the molding section via the pressurized oil flow path section. Then, the press molding machine introduces the hydraulic oil supplied to the molding portion around the molding material and press-molds the molding material isotropically from the surroundings. After the press molding is completed, the press molding machine discharges the hydraulic oil supplied to the molding section to the pressure boosting oil chamber via the pressurized oil flow path section.

In this way, the press molding machine of the study example supplies hydraulic oil from the pressure boosting oil chamber to the molding section via the pressurized oil flow path section during press molding, and supplies the hydraulic oil to the molding section after the press molding is completed. Is discharged to the pressure boosting oil chamber via the pressurized oil flow path. According to this, in the press molding machine of the study example, the supply of the hydraulic oil from the pressure boosting oil chamber to the molding portion and the discharge of the hydraulic oil from the molding portion to the pressure boosting oil chamber are carried out through the pressurized oil flow path portion. Since it is possible, the hydraulic circuit can be simplified as compared with the case where the hydraulic circuit having the supply flow path and the discharge flow path is provided.

However, in this configuration, since the hydraulic oil is sealed in the pressure boosting oil chamber and the molding portion, it is difficult to discharge the hydraulic oil to the outside of the pressure boosting oil chamber and the molding portion. Therefore, even if the hydraulic oil leaks from the gap of the booster cylinder portion and air is mixed in the booster oil chamber, it is difficult to replenish the leaked hydraulic oil and discharge the mixed air.

An object of the present disclosure is to provide a press molding machine capable of discharging air mixed in a booster oil chamber and replenishing hydraulic oil in the booster oil chamber while simplifying a hydraulic circuit.

The invention according to claim 1
A press molding machine that operates under the pressure of hydraulic oil.
A pressure boosting cylinder unit (10) that pressurizes hydraulic oil by the driving force supplied from the drive unit (2), and
A molding part (40) that press-molds the molding material into a predetermined shape by the pressure of the hydraulic oil pressurized by the pressure boosting cylinder part, and
Pressurized oil flow path portion (21) connecting the pressure boosting cylinder portion and the molding portion, and
An oil storage unit (50) that stores hydraulic oil for replenishment in the pressure boosting cylinder unit, and
A replenishment oil flow path portion (52) connecting the pressure boosting cylinder portion and the oil storage portion, and
A replenishment oil flow path opening / closing part (53) for opening / closing the replenishing oil flow path portion,
A control unit (100) that controls the operation of the drive unit and the replenishment oil flow path opening / closing unit is provided.
The pressure boosting cylinder portion is formed in a bottomed shape that extends in the vertical direction, the upper end is opened, and the lower end is closed, and the inner peripheral portion of the cylinder by the driving force supplied from the driving portion. It has a piston (13) that slides and moves on a cylinder inner peripheral portion (111), and a boosting oil chamber (20) that is partitioned by the cylinder inner peripheral portion and the piston and is lubricated with hydraulic oil.
The piston is configured to be movable below the initial position of the piston, which is the position of the piston in which the hydraulic oil lubricated into the boosting oil chamber is in a non-pressurized state.
The booster oil chamber is located lower than the bottom of the oil storage.
One end of the refill oil flow path is connected to an oil injection hole (22) provided at the uppermost part of the boosting oil chamber when the piston is in the initial position of the piston, and the other end is provided on the bottom surface of the oil storage part. It is connected to the oil supply hole (51) and
When performing press molding, the control unit controls the drive unit so that the position of the piston is lower than the initial position of the piston, and controls the replenishment oil flow path opening / closing unit so that the replenishment oil flow path is closed. When press molding is not performed, the drive unit is controlled so that the position of the piston is the initial position of the piston, and the replenishment oil flow path opening / closing unit is controlled so that the replenishment oil flow path portion is in an open state.

According to this, one end side of the replenishment oil flow path portion is connected to the oil injection hole, and the other end side is connected to the oil supply hole. Therefore, when the piston is arranged at the initial position of the piston, the boosting oil chamber and the oil storage portion are connected via the replenishment oil flow path portion. Further, the oil injection hole is arranged at a position lower than the oil supply hole. Therefore, when the replenishment oil flow path portion is opened, the air discharged from the oil injection hole is discharged to the oil storage section via the replenishment oil flow path portion.

When the air mixed in the boosted oil chamber is discharged to the oil storage section, the replenishing hydraulic oil stored in the oil storage section is lubricated into the boosted oil chamber via the refilling oil flow path. Oil.

Therefore, when the press molding machine does not perform press molding, the air mixed in the pressure boosting oil chamber is discharged to the oil storage section through the replenishment oil flow path section, and the hydraulic oil stored in the oil storage section is discharged. The booster oil chamber can be replenished via the replenishment oil flow path portion.

Further, in the press molding machine, the pressure boosting oil chamber and the molding portion are connected by a pressurized oil flow path portion, and during press molding, hydraulic oil is supplied from the pressure boosting oil chamber to the molding portion and the pressure is increased from the molding portion. The hydraulic oil can be discharged to the oil chamber via the pressurized oil flow path. Therefore, the press molding machine can simplify the hydraulic circuit as compared with the case where the press molding machine includes the hydraulic circuit having the supply flow path and the discharge flow path.

The reference numerals in parentheses attached to each component or the like indicate an example of the correspondence between the component or the like and the specific component or the like described in the embodiment described later.

It is a schematic block diagram of the press molding machine which concerns on embodiment. It is the schematic sectional drawing of the pressure increasing cylinder part and the molding part which concerns on embodiment. It is explanatory drawing for demonstrating the flow of hydraulic oil at the time of press molding which concerns on embodiment. It is explanatory drawing for demonstrating the flow of hydraulic oil after press molding which concerns on embodiment. It is a flowchart which shows an example of the control process executed by the control part of the press molding machine which concerns on embodiment. It is explanatory drawing for demonstrating the flow of air at the time of air discharge and the flow of hydraulic oil at the time of replenishing hydraulic oil according to the embodiment.

An embodiment of the present disclosure will be described with reference to FIGS. 1 to 6. The press molding machine 1 operates under the pressure of the hydraulic oil, and press-molds the molding material filled in the press molding machine 1 with the pressurized hydraulic oil. As shown in FIG. 1, the press molding machine 1 includes a pressure boosting cylinder portion 10 that pressurizes hydraulic oil by a driving force supplied from a driving unit 2, and a molding portion 40 that pressurizes a molding material by the pressurized hydraulic oil. And an oil storage unit 50 for storing hydraulic oil for replenishment. Further, the press molding machine 1 includes a pressurized oil flow path portion 21 that connects the pressure boosting cylinder portion 10 and the molding portion 40, a replenishment oil flow path portion 52 that connects the pressure boosting cylinder portion 10 and the oil storage portion 50, and The control unit 100 for controlling the constituent equipment of the press molding machine 1 is provided.

The drive unit 2 supplies a driving force for press molding to the pressure boosting cylinder unit 10, and is a supply source of the driving force for the press molding machine 1 to perform press molding. In the present embodiment, the drive unit 2 is composed of, for example, a servo press mechanism including a press unit 3 and an electric motor 4, and the press unit 3 can move in the vertical direction by rotation of the electric motor 4. It is configured in. The electric motor 4 is connected to a control unit 100, which will be described later, and the rotation direction is controlled by a control signal transmitted from the control unit 100. In the drive unit 2, for example, when the control unit 100 rotates the electric motor 4 in the forward direction, the press unit 3 moves downward, and when the control unit 100 rotates the electric motor 4 in the reverse direction, the press unit 3 moves upward. Moving. In the drive unit 2, the press unit 3 is connected to the pressure boosting cylinder unit 10.

The pressure boosting cylinder portion 10 will be described with reference to FIG. 2 showing a cross section of the pressure boosting cylinder portion 10. The pressure boosting cylinder portion 10 pressurizes and applies hydraulic oil by a driving force supplied from the drive unit 2. This is a device that supplies the compressed hydraulic oil to the molding unit 40. The pressure boosting cylinder portion 10 has a cylindrical cylinder 11 that constitutes an outer shell, and a piston 13 is inserted into the cylinder 11. Further, the pressure boosting cylinder portion 10 has a pressure boosting oil chamber 20 which is partitioned by a cylinder 11 and a piston 13 and in which hydraulic oil is lubricated in advance. Further, in the pressure boosting cylinder portion 10, a cylinder lid portion 15 for suppressing air from entering the pressure boosting oil chamber 20 is arranged. The pressure boosting cylinder portion 10 is composed of an oil chamber into which hydraulic oil is lubricated and a single-acting hydraulic cylinder mechanism in which an inlet / outlet for hydraulic oil is provided only on one side of the piston 13.

The cylinder 11 is formed in a bottomed cylindrical shape extending in the vertical direction, and the upper end side is open and the lower end side is closed. The cylinder 11 can be lubricated with hydraulic oil inside, and is connected to a base portion 12 that supports the pressure boosting cylinder portion 10 at the bottom.

In the cylinder 11, the piston 13 is inserted downward from the cylinder opening 112, which is the upper end of the cylinder 11, along the axial direction of the cylinder 11. Further, the cylinder inner peripheral portion 111, which is the inner peripheral portion of the cylinder 11, is provided with a seal member 14 at the insertion portion of the piston 13.

The piston 13 compresses the hydraulic oil lubricated to the cylinder 11 by the driving force supplied from the driving unit 2. The piston 13 is formed of a substantially columnar shape extending in the vertical direction. Further, the piston 13 is formed so that the outer diameter is slightly smaller than the inner diameter of the cylinder 11, and the piston 13 slides in the cylinder inner peripheral portion 111 and moves in the vertical direction by the driving force supplied from the driving portion 2. It is configured to be possible. The upper side of the piston 13 is projected to the outside of the cylinder 11 and is connected to the press unit 3 of the drive unit 2. As the press unit 3 moves in the vertical direction, the piston 13 moves in the vertical direction.

Further, the piston 13 has a substantially truncated cone shape at the lower end portion, and is formed so that the outer diameter gradually decreases from the upper side to the lower side. The piston 13 is provided with a flat piston surface 132 that presses hydraulic oil on the lowermost surface.

The seal member 14 is for suppressing the hydraulic oil from leaking from the gap between the inner peripheral portion 111 of the cylinder and the outer peripheral portion 131 of the piston, which is the outer peripheral portion of the piston 13, and is, for example, a rubber formed in an annular shape. It is composed of an O-ring formed of an elastic member such as. In the present embodiment, the seal member 14 is fitted in the recessed portion provided in the cylinder inner peripheral portion 111, and suppresses the leakage of hydraulic oil from the gap between the cylinder inner peripheral portion 111 and the piston outer peripheral portion 131. At the same time, air is suppressed from being mixed into the pressure boosting oil chamber 20. Further, the pressure boosting cylinder portion 10 is provided with a cylinder lid portion 15 that prevents air from entering the pressure boosting oil chamber 20 at a position that closes the cylinder opening 112.

The cylinder lid portion 15 is for suppressing air from entering the pressure boosting oil chamber 20. Further, the cylinder lid portion 15 is formed in a substantially cylindrical shape, and the piston 13 is configured to penetrate the cylinder lid portion 15 and be inserted into the cylinder 11. In the present embodiment, the cylinder lid portion 15 is composed of a substantially cylindrical lid main body 16 to which hydraulic oil is lubricated and a substantially cylindrical lid sealing portion 17 for encapsulating the hydraulic oil lubricated to the lid main body 16. ing.

The inner diameter of the lid main body 16 is smaller than the outer diameter of the cylinder 11, and the lid main body 16 can be arranged on the upper surface of the cylinder 11. Further, the lid main body 16 has an inner diameter larger than the inner diameter of the cylinder 11, and when the piston 13 is inserted into the lid main body 16, the inner peripheral portion of the lid main body 16 and the outer peripheral portion 131 of the piston are formed. It is formed so as not to come into contact with each other. That is, the lid main body 16 is formed so that the inner peripheral portion is recessed in the direction away from the axis of the lid main body 16, and hydraulic oil is lubricated between the inner peripheral portion of the lid main body 16 and the piston outer peripheral portion 131. A gap is formed. In the present embodiment, the gap between the inner peripheral portion of the lid main body portion 16 and the outer peripheral portion 131 of the piston corresponds to the lid groove portion 18.

The hydraulic oil lubricated in the lid groove portion 18 is sealed by covering the lid main body portion 16 with the lid sealing portion 17. A sealing material (not shown) is provided on the lower surface of the lid body 16 to prevent the hydraulic oil lubricated into the lid groove 18 from leaking from the gap between the upper surface of the cylinder 11 and the lower surface of the lid body 16. ing.

The outer diameter of the lid sealing portion 17 is formed to be larger than the inner diameter of the lid main body portion 16, and the lid groove portion 18 is configured to be able to fill the hydraulic oil lubricated. Further, the inner diameter of the lid sealing portion 17 is formed to be substantially equal to the inner diameter of the cylinder 11, so that the piston outer peripheral portion 131 of the piston 13 inserted into the cylinder 11 slides on the inner peripheral portion of the lid sealing portion 17. It is formed. In the present embodiment, the inner peripheral portion of the lid sealing portion 17 corresponds to the lid sliding portion 171.

The lid sealing portion 17 is formed of a transparent member such as a transparent acrylic plate, and is configured so that the amount of hydraulic oil lubricated to the lid groove portion 18 can be visually recognized.

The pressure boosting oil chamber 20 is an oil chamber of the pressure boosting cylinder portion 10 which is partitioned by the inner peripheral portion 111 of the cylinder and the piston surface 132 of the piston 13, and hydraulic oil is lubricated into the partitioned space. The pressure boosting oil chamber 20 is arranged below the piston 13, and the volume of the pressure boosting oil chamber 20 is configured to be variable as the piston 13 moves in the vertical direction. That is, the volume of the pressure boosting oil chamber 20 becomes maximum when the piston 13 moves to the uppermost part in the movement range of the piston 13, and becomes minimum when it moves to the lowermost part in the movement range of the piston 13.

Further, the hydraulic oil lubricated into the pressure boosting oil chamber 20 has the minimum pressure when the volume of the pressure boosting oil chamber 20 is maximum, and the pressure is maximum when the volume of the pressure boosting oil chamber 20 is minimum. .. That is, the hydraulic oil lubricated into the pressure boosting oil chamber 20 is pressurized when the press portion 3 moves the piston 13 downward, and is depressurized when the pressing portion 3 is moved upward.

In the present embodiment, the hydraulic oil lubricated into the pressure boosting oil chamber 20 is lubricated so as to fill all the pressure boosting oil chamber 20 in a non-pressurized state when the volume of the pressure boosting oil chamber 20 is maximized. There is. That is, the hydraulic oil lubricated into the pressure boosting oil chamber 20 is in a non-pressurized state when the piston 13 moves to the uppermost part in the movement range of the piston 13. The position of the piston 13 in which the hydraulic oil lubricated into the boosting oil chamber 20 is in a non-pressurized state is also referred to as a piston initial position.

The pressure boosting oil chamber 20 is connected to an abnormal oil flow path portion 30 for discharging the hydraulic oil from the pressure boosting oil chamber 20 when the pressure of the hydraulic oil becomes a predetermined pressure or higher. Further, the pressure boosting oil chamber 20 is connected to a pressure oil flow path portion 21 for supplying the hydraulic oil pressurized by the piston 13 to the molding portion 40.

Further, in the pressure boosting oil chamber 20, when the hydraulic oil lubricated into the pressure boosting oil chamber 20 leaks and air is mixed in the pressure boosting oil chamber 20, the mixed air is discharged to the outside and the pressure boosting oil chamber 20 is discharged. An oil supply hole 51 for replenishing hydraulic oil is arranged in the. The oil injection hole 22 is provided on the side surface of the pressure boosting oil chamber 20 at a position where the piston 13 is the uppermost portion of the pressure boosting oil chamber 20 when the piston is in the initial position. The oil injection hole 22 is connected to a replenishment oil flow path portion 52, which will be described later.

The abnormal oil flow path portion 30 will be described by returning to FIG. 1. The abnormal oil flow path portion 30 is a hydraulic oil when the pressure of the hydraulic oil lubricated into the pressure boosting oil chamber 20 is pressurized to a predetermined pressure or higher. Is an oil flow path for discharging the oil into the reserve tank 31 arranged at the tip of the abnormal oil flow path portion 30. A relief valve 32 that opens and closes the abnormal oil flow path portion 30 is arranged in the abnormal oil flow path portion 30. The relief valve 32 is configured to be able to detect the pressure of the hydraulic oil lubricated into the boosting oil chamber 20, and when the pressure of the hydraulic oil in the boosting oil chamber 20 becomes equal to or higher than a predetermined pressure, the relief valve 32 is opened. By opening, the pressure boosting oil chamber 20 is communicated with the reserve tank 31.

The pressurized oil flow path portion 21 is an oil flow path for supplying the hydraulic oil of the pressure boosting oil chamber 20 pressurized by the piston 13 to the molding section 40 when performing press molding. The pressurized oil flow path portion 21 is connected to the pressure boosting oil chamber 20 and the molding portion 40.

Subsequently, the molded portion 40 will be described with reference to FIG. 2, which shows a cross section of the molded portion 40. The molding unit 40 pressurizes the molding material filled inside the molding unit 40 with the hydraulic oil pressurized by the pressure increasing cylinder unit 10, and press-molds it into a predetermined shape. The molding section 40 includes a molding housing section 41 that forms the outer shell of the molding section 40, a mold section 45 that is filled with a molding material, a molding oil chamber 46 in which hydraulic oil is pre-lubricated, and a molding oil chamber for hydraulic oil. It is configured to include an oil introduction section 47 to be introduced into 46.

The molding accommodating portion 41 is an accommodating case accommodating a mold portion 45, a molding oil chamber 46, and an oil introduction portion 47, and is composed of, for example, a metal member. The molding accommodating portion 41 is formed in a hollow cylindrical shape extending in the vertical direction, and has a cylindrical portion 42 which is a cylindrical portion, a circular flat plate-shaped cylindrical top plate 43 arranged above the cylindrical portion 42, and a cylindrical portion. It is formed by a circular flat cylindrical bottom plate 44 arranged under the 42. The molding accommodating portion 41 is provided with an accommodating hole 411 penetrating the outer shell of the cylindrical portion 42 in the cylindrical portion 42, and the pressurized oil flow path portion 21 is connected to the accommodating hole portion 411.

The outer diameter of the cylindrical portion 42 is formed to be smaller than the outer diameter of the cylindrical top plate 43 and the outer diameter of the cylindrical bottom plate 44, and is closed by the cylindrical top plate 43 and the cylindrical bottom plate 44. Further, inside the cylindrical portion 42, a substantially cylindrical mold portion 45 is arranged substantially in the center, and a substantially cylindrical oil introduction portion 47 is arranged on the inner wall portion of the cylindrical portion 42.

The cylindrical top plate 43 is formed with a top plate convex portion 431 in which the substantially center of the lower surface protrudes downward as compared with other portions, and the top plate convex portion 431 is connected to the upper side of the mold portion 45. .. Further, the cylindrical bottom plate 44 is formed with a bottom plate convex portion 441 whose substantially center of the upper surface protrudes upward as compared with other portions, and the bottom plate convex portion 441 is connected to the lower side of the mold portion 45. ..

The top plate convex portion 431 is provided with a top plate loading hole 432 for loading the molding material from above the mold portion 45. The top plate input hole 432 penetrates the cylindrical top plate 43 and is formed in a substantially truncated cone shape so that the diameter gradually decreases toward the mold portion 45. Further, the top plate insertion hole 432 is configured so that a top plate lid portion 433 for closing the top plate insertion hole 432 formed of an elastic member such as rubber can be fitted. The top plate lid portion 433 is formed of an elastic member such as rubber.

The bottom plate convex portion 441 is provided with a bottom plate take-out hole 442 for taking out the completed molded product after press molding from the lower side of the mold portion 45. The bottom plate take-out hole 442 penetrates the cylindrical bottom plate 44 and is formed in a substantially truncated cone shape so that the outer diameter gradually increases toward the lower side. Further, the bottom plate take-out hole 442 is configured so that the bottom plate lid portion 443 for closing the bottom plate take-out hole 442 can be fitted. The bottom plate lid portion 443 is formed of an elastic member such as rubber.

The mold portion 45 press-molds the molding material filled inside the mold portion 45. The mold portion 45 is formed in a substantially cylindrical shape, and is configured so that a molding material can be filled therein. Further, the mold portion 45 is formed of a flexible member, and when pressure is applied from the outside to the inside of the mold portion 45 in a state where the molding material is filled, the mold portion 45 is compressed. The molding material filled in the mold portion 45 can be press-molded.

Further, the mold portion 45 is concentric with the molding accommodating portion 41, and a mold charging port 451 for charging the molding material into the mold portion 45 is provided on the upper side of the mold portion 45. Further, on the lower side of the mold portion 45, a mold outlet 452 for taking out the completed molded product from the mold portion 45 is provided. In the mold portion 45, the mold insertion port 451 is connected to the top plate insertion hole 432 of the cylindrical top plate 43, and the mold outlet 452 is connected to the bottom plate extraction hole 442 of the cylindrical bottom plate 44. Therefore, in the mold portion 45, the mold inlet 451 is closed by the top plate lid portion 433, and the mold outlet 452 is closed by the bottom plate lid portion 443, so that the space inside the mold portion 45 is sealed. The mold portion 45 is filled with a molding material from the mold inlet 451 before press molding, and the press-molded molded product is taken out from the mold outlet 452 after press molding.

The inner wall portion of the mold portion 45 is formed in a shape along the outer shell of the molded product in order to obtain a molded product having a predetermined shape. In the present embodiment, the molding material to be filled in the mold portion 45 is composed of, for example, a rubber member and ceramic powder, and the outer shell having substantially the same shape as the inner wall portion of the mold portion 45 by being press-molded. The rubber product formed by is molded. A molding oil chamber 46 is formed around the mold portion 45.

The molding oil chamber 46 is an oil chamber of the molding portion 40 which is partitioned by the inner peripheral portion of the molding portion 40 and is lubricated with hydraulic oil for pressurizing the mold portion 45. Specifically, the molding oil chamber 46 is divided by the inner wall portion of the cylindrical portion 42, the lower surface of the cylindrical top plate 43, the upper surface of the cylindrical bottom plate 44, the outer peripheral portion of the mold portion 45, and the inner peripheral portion of the oil introduction portion 47 described later. The hydraulic oil is pre-lubricated to the formed and partitioned spaces. That is, the molding oil chamber 46 is formed between the mold portion 45 and the oil introduction portion 47.

The molding oil chamber 46 communicates with the pressure boosting oil chamber 20 via the oil introduction portion 47 and the pressurized oil flow path portion 21, and the hydraulic oil lubricated into the molding oil chamber 46 flows to the pressure boosting oil chamber 20. It is possible, and the hydraulic oil lubricated in the boosting oil chamber 20 is configured to be circulated to the molding oil chamber 46. Therefore, when the drive unit 2 moves the piston 13 downward, the hydraulic oil in the boosting oil chamber 20 and the molding oil chamber 46 lubricated in the boosting oil chamber 20 while flowing into the molding oil chamber 46. The hydraulic oil lubricated into is pressurized together.

The hydraulic oil pre-lubricated to the molding oil chamber 46 is not pressurized when the hydraulic oil lubricated to the boosting oil chamber 20 is not pressurized, that is, when the piston 13 is arranged at the initial position of the piston. Lubrication is performed so as to fill all the molding oil chambers 46 under pressure.

The oil introduction portion 47 communicates with the pressurized oil flow path portion 21 via the accommodating hole portion 411, and the hydraulic oil introduced from the pressure boosting oil chamber 20 is introduced into the molding oil chamber 46, and the mold portion 45 It is a flow path of hydraulic oil that leads to the surroundings. The oil introduction portion 47 has a hollow cylindrical shape concentric with the cylindrical portion 42, and the vertical size of the oil introduction portion 47 is formed to be smaller than the vertical size of the cylindrical portion 42. Further, the oil introduction portion 47 is substantially at the center of the cylindrical portion 42 in the vertical direction, and is arranged along the entire circumferential direction of the inner wall portion of the cylindrical portion 42.

The oil introduction portion 47 includes an oil introduction outer peripheral portion 471 whose outer shell is an outer peripheral portion of the oil introduction portion 47, and includes an oil introduction inner peripheral portion 472 whose inner shell is an inner peripheral portion of the oil introduction portion 47. It is composed of. The oil introduction outer peripheral portion 471 in this embodiment corresponds to the oil introduction outer shell surface 61. Further, the oil-introduced inner peripheral portion 472 in the present embodiment corresponds to the oil-introduced inner shell surface 62.

In the present embodiment, the oil introduction outer peripheral portion 471 is formed so that the upper end portion and the lower end portion are recessed inward in the radial direction of the oil introduction portion 47. Further, the oil introduction outer peripheral portion 471 has an oil introduction groove portion 48 formed in which the central portion is recessed in the radial direction of the oil introduction portion 47 as compared with the upper end portion and the lower end portion, and the oil introduction groove portion 48 has an oil introduction groove portion 48. The pressurized oil flow path portion 21 is connected. Therefore, the hydraulic oil introduced into the oil introduction groove portion 48 via the pressurized oil flow path portion 21 is configured to be able to flow in the circumferential direction of the oil introduction portion 47.

Further, the oil introduction portion 47 penetrates from the oil introduction outer peripheral portion 471 toward the oil introduction inner peripheral portion 472, and a plurality of penetration portions 49 communicating with the accommodating hole portion 411 are provided in the oil introduction groove portion 48. Therefore, the hydraulic oil introduced into the oil introduction groove portion 48 via the accommodating hole portion 411 is introduced into the molding oil chamber 46 formed inside the oil introduction portion 47 via the through portion 49.

The penetrating portion 49 is provided over the entire oil introduction groove portion 48 at predetermined intervals in the vertical direction and the circumferential direction of the oil introduction groove portion 48, and the hydraulic oil introduced into the oil introduction groove portion 48 is a cylinder. It can be introduced substantially uniformly around the mold portion 45 arranged in the center of the portion 42.

Further, in the present embodiment, in the oil introduction portion 47, the outer end portion 473 which is the end portion of the oil introduction outer peripheral portion 471 and the inner end portion 474 which is the end portion of the oil introduction inner peripheral portion 472 are formed in a curved surface shape. There is. Specifically, the upper surface and the lower surface of the hollow disk shape of the oil introduction portion 47 are formed with curved outer ends and inner ends.

Next, the oil storage unit 50 will be described. The oil storage unit 50 is an oil tank that stores hydraulic oil for replenishing the pressure boosting cylinder unit 10. The oil storage unit 50 is formed in a bottomed cylindrical shape extending in the vertical direction, and is configured to be capable of storing hydraulic oil for replenishment to the pressure boosting cylinder unit 10 inside. Further, the bottom surface of the oil storage unit 50 is arranged so as to be higher than the pressure boosting oil chamber 20. In other words, the oil injection hole 22 provided in the pressure boosting oil chamber 20 is arranged at a position lower than the bottom surface of the oil storage unit 50. The bottom surface of the oil storage unit 50 is provided with an oil supply hole 51 for supplying hydraulic oil for replenishment to the pressure boosting oil chamber 20. The oil supply hole 51 is connected to the replenishment oil flow path portion 52.

When air is mixed in the pressure boosting oil chamber 20, the replenishment oil flow path portion 52 discharges the mixed air to the oil storage section 50 via the replenishment oil flow path section 52 and stores the mixed air in the oil storage section 50. This is an oil flow path for supplying the hydraulic oil to the boosting oil chamber 20. One end side of the refilling oil flow path portion 52 is connected to an oil injection hole 22 provided in the boosting oil chamber 20, and the other end side is connected to an oil supply hole 51 provided in the oil storage portion 50. Further, the replenishment oil flow path portion 52 is provided with a replenishment oil flow path opening / closing portion 53 for opening / closing the replenishment oil flow path portion 52.

The replenishment oil flow path opening / closing section 53 is a solenoid valve for opening / closing the refilling oil flow path section 52, and is composed of a normally closed type, that is, a normally closed type solenoid valve. The replenishment oil flow path opening / closing unit 53 is connected to the control unit 100, and is configured to be able to control switching of opening / closing based on a control signal from the control unit 100.

Next, the control unit 100 will be described. The control unit 100 is configured mainly by a microcomputer, and has preset control programs and updatable controls in various memories (ROM, RAM, EEPROM, etc.) built in as storage means. The program is remembered. The control unit 100 controls the operation of the constituent devices of the press molding machine 1 based on the control programs stored in the various memories and the various information input.

Specifically, for example, a drive unit 2 and a refill oil flow path opening / closing unit 53 are connected to the output side of the control unit 100, and the drive unit 2 and the replenishment oil flow path are based on the operation of the press molding machine 1. The opening / closing unit 53 is controlled.

Next, regarding the operation of the press molding machine 1, an explanatory diagram for explaining the flow of hydraulic oil when performing press molding shown in FIGS. 3 and 4 and a flowchart of the control process executed by the control unit 100 shown in FIG. 5 are shown. It will be explained with reference to. In the initial state of the press molding machine 1, the drive unit 2 has stopped operating, and the piston 13 is arranged at the initial position of the piston. Further, in the initial state of the press molding machine 1, the replenishment oil flow path opening / closing portion 53 closes the replenishment oil flow path portion 52.

As shown in FIG. 5, first, in step S10, the control unit 100 determines whether or not press molding is performed. When press molding is performed as a result of the determination process in step S10, in step S11, the control unit 100 sets the refill oil flow path opening / closing unit 53 so that the refill oil flow path portion 52 is maintained in the closed state. Control. Subsequently, in step S12, the mold portion 45 is filled with the molding material. The molding material is put into the mold portion 45 when the bottom plate lid portion 443 is fitted to the cylindrical bottom plate 44, and after filling the mold portion 45, the top plate lid portion 433 is fitted to the cylindrical top plate 43. This is enclosed in the mold portion 45.

Subsequently, in step S13, the control unit 100 transmits a control signal to the electric motor 4 of the drive unit 2 to rotate the electric motor 4 in the forward direction. When the electric motor 4 rotates in the forward direction, as shown in FIG. 3, the press unit 3 of the drive unit 2 moves the piston 13 downward from the initial position of the piston. When the piston 13 moves downward, the hydraulic oil lubricated in the boosting oil chamber 20 flows into the pressurized oil flow path portion 21 while being pressurized by being pressed by the piston 13. Then, the hydraulic oil introduced into the oil introduction portion 47 via the pressurized oil flow path portion 21 flows into the molding oil chamber 46 through the oil introduction groove portion 48 and the penetration portion 49, and is introduced around the mold portion 45. To.

The hydraulic oil introduced around the mold portion 45 is pressurized together with the hydraulic oil previously lubricated in the molding oil chamber 46. Then, the pressurized hydraulic oil isotropically pressurizes the mold portion 45 from the outer peripheral side of the mold portion 45 toward the inner peripheral side of the mold portion 45, thereby compressing the mold portion 45. As the drive unit 2 moves the piston 13 downward, the force with which the hydraulic oil presses the mold portion 45, that is, the force with which the mold portion 45 presses the molding material increases.

When the piston 13 moves to a position where the force with which the mold portion 45 presses the molding material becomes the pressure required to make the molding material into a molded product, the molding material filled inside the mold portion 45 becomes the molded product. And press molding is completed. Further, in step S14, the control unit 100 stops the rotation of the electric motor 4 and stops the movement of the piston 13.

When the press molding is completed, in step S15, the control unit 100 reversely rotates the electric motor 4 and moves the piston 13 upward as shown in FIG. When the control unit 100 moves the piston 13 upward, the hydraulic oil in the molding oil chamber 46 is depressurized. As a result, the pressure generated on the outer peripheral side of the mold portion 45 is reduced, and the mold portion 45 returns to its original shape.

Further, when the control unit 100 moves the piston 13 upward, the hydraulic oil supplied from the boosting oil chamber 20 to the molding oil chamber 46 is discharged to the boosting oil chamber 20. Then, the control unit 100 reversely rotates the electric motor 4 until the piston 13 returns to the initial position of the piston. Then, the hydraulic oil in the boosting oil chamber 20 and the molding oil chamber 46 returns to the non-pressurized state.

Then, in step S16, the bottom plate lid portion 443 of the cylindrical bottom plate 44 is opened, so that the molded product is taken out from the mold portion 45. In this way, the press molding machine 1 performs press molding.

By the way, in the press molding machine 1, the hydraulic oil lubricated into the pressure boosting oil chamber 20 may leak from the gap between the piston 13 and the cylinder 11 while repeating the press molding. If hydraulic oil leaks from the gap between the piston 13 and the seal member 14, air may be mixed into the pressure boosting oil chamber 20 instead of the leaked hydraulic oil.

When air is mixed in the pressure boosting oil chamber 20, the mixed air prevents the pressure generated on the outer peripheral portion of the mold portion 45 during press molding from becoming uniform, which causes a problem in the molded product. Become. Therefore, it is desirable that the press molding machine 1 discharges the air mixed in the pressure boosting oil chamber 20. When air is mixed into the pressure boosting oil chamber 20, the air has a specific gravity smaller than that of the hydraulic oil, and is therefore located at the uppermost portion of the pressure boosting oil chamber 20. Hereinafter, regarding the air discharge operation for discharging the air mixed in the pressure boosting oil chamber 20, the flowchart of the control process executed by the control unit 100 shown in FIG. 5 and the air when the air discharge operation of the molding unit 40 shown in FIG. 6 is performed. This will be described with reference to an explanatory diagram illustrating the flow of.

As shown in FIG. 5, in step S10, the control unit 100 determines whether or not press molding is performed. As a result of the determination process in step S10, when press molding is not performed, the control unit 100 maintains the position of the piston 13 at the initial position of the piston in step S17. By the way, in the present embodiment, the pressure boosting oil chamber 20 is provided with an oil injection hole 22 at the uppermost portion when the piston 13 is in the initial position of the piston. Further, one end side of the replenishment oil flow path portion 52 is connected to the oil injection hole 22, and the other end side is connected to the oil supply hole 51 of the oil storage portion 50. Therefore, when the piston 13 is in the initial position of the piston, the boosting oil chamber 20 and the oil storage section 50 are connected via the replenishment oil flow path section 52.

Next, in step S18, the control unit 100 controls the replenishment oil flow path opening / closing unit 53 so that the replenishment oil flow path portion 52 is in an open state. Here, the oil injection hole 22 of the pressure boosting oil chamber 20 is arranged at a position lower than the oil supply hole 51 of the oil storage unit 50. Therefore, when the replenishment oil flow path portion 52 is opened, the air mixed in the boosting oil chamber 20 is discharged from the oil injection hole 22 and the air discharged from the oil injection hole 22 as shown in FIG. Is discharged to the oil storage section 50 via the replenishment oil flow path section 52.

Further, when the air mixed in the boosting oil chamber 20 is discharged to the oil storage section 50, the replenishing hydraulic oil stored in the oil storage section 50 is the boosting oil via the refilling oil flow path section 52. The chamber 20 is lubricated.

All the air mixed in the pressure boosting oil chamber 20 is discharged to the oil storage unit 50, and the hydraulic oil is replenished from the oil storage unit 50 to the pressure boosting oil chamber 20, so that the pressure boosting oil chamber 20 is not pressurized. When filled with the hydraulic oil of the state, the air discharge operation ends.

When the air discharge operation is completed, in step S19, the control unit 100 controls the replenishment oil flow path opening / closing unit 53 so that the replenishment oil flow path portion 52 is closed.

As a result, when the press molding machine 1 performs press molding, the replenishment oil flow path portion 52 is closed to pressurize the hydraulic oil in the pressure boosting oil chamber 20 and to pass through the pressurized oil flow path portion 21. It can be supplied around the mold portion 45. Further, the press molding machine 1 isotropically pressurizes the mold portion 45 by pressurizing the hydraulic oil introduced around the mold portion 45 filled with the molding material, and the molding material filled in the mold portion 45 is predetermined. It can be press-molded into a shape.

Further, in the present embodiment, one end side of the replenishment oil flow path portion 52 is connected to the oil injection hole 22, and the other end side is connected to the oil supply hole 51. Therefore, when the piston 13 is in the initial position of the piston, the press molding machine 1 can connect the pressure boosting oil chamber 20 and the oil storage section 50 via the replenishment oil flow path section 52. Further, the oil injection hole 22 is arranged at a position lower than the oil supply hole 51. Therefore, when the replenishment oil flow path portion 52 is opened, the press molding machine 1 can discharge the air discharged from the oil injection hole 22 to the oil storage section 50 via the replenishment oil flow path portion 52.

Further, when the air mixed in the pressure boosting oil chamber 20 is discharged to the oil storage unit 50, the press molding machine 1 replenishes the replenishment hydraulic oil stored in the oil storage unit 50 to the replenishment oil flow path portion 52. The pressure boosting oil chamber 20 can be lubricated through the oil.

Therefore, when the press molding machine 1 does not perform press molding, the air mixed in the pressure boosting oil chamber 20 is discharged to the oil storage section 50 via the replenishment oil flow path section 52 and stored in the oil storage section 50. The boosted oil chamber 20 can be replenished with the hydraulic oil.

Further, in the press molding machine 1, the pressure boosting oil chamber 20 and the molding unit 40 are connected by a pressurized oil flow path portion 21, and the hydraulic oil is supplied from the pressure boosting oil chamber 20 to the molding unit 40 and the molding unit 40. The hydraulic oil can be discharged from the pressure-increasing oil chamber 20 to the pressure-increasing oil chamber 20 via the pressurized oil flow path portion 21. Therefore, the press molding machine 1 can be configured with a simple hydraulic circuit as compared with the case where a hydraulic circuit having a supply flow path and a discharge flow path is provided.

By the way, in the press molding machine 1, when the piston 13 slides on the cylinder inner peripheral portion 111 and moves in the vertical direction, a gap generated between the cylinder inner peripheral portion 111 and the piston outer peripheral portion 131 from the cylinder opening 112. There is a possibility that air may be mixed into the pressure boosting oil chamber 20 via the above.

On the other hand, in the pressure boosting cylinder portion 10 of the present embodiment, the cylinder opening 112 is closed by the cylinder lid portion 15. Further, the cylinder lid portion 15 is formed so that the inner peripheral portion of the lid sealing portion 17 slides on the outer peripheral portion of the piston 13, and operates in the gap between the inner peripheral portion of the lid main body portion 16 and the piston outer peripheral portion 131. A lid groove portion 18 lubricated with oil is provided.

Therefore, even if a gap is formed between the cylinder inner peripheral portion 111 and the piston outer peripheral portion 131, the press molding machine 1 can allow the hydraulic oil lubricated to the lid groove portion 18 to flow into the gap. Therefore, the press molding machine 1 can prevent air from being mixed into the pressure boosting oil chamber 20.

Further, in the press molding machine 1, when the hydraulic oil supplied from the pressure boosting oil chamber 20 to the molding oil chamber 46 is discharged to the pressure boosting oil chamber 20, the hydraulic oil inside the molding oil chamber 46 is drawn by the piston 13. Therefore, air may be mixed into the molding oil chamber 46 from the gap of the molding portion 40. When air is mixed in the molding oil chamber 46, it is desirable that the press molding machine 1 discharges the mixed air to the oil storage portion 50 via the pressurized oil flow path portion 21 and the pressure boosting oil chamber 20.

However, in the present embodiment, the oil introduction outer peripheral portion 471 is formed so that the upper end portion and the lower end portion are recessed inward in the radial direction of the oil introduction portion 47. Therefore, in the molding oil chamber 46, the flow path between the upper end portion and the molding accommodating portion 41 and the flow path between the lower end portion and the molding accommodating portion 41 are narrower than those around the mold portion 45. There is. Therefore, when the corners are formed on the outer end 473 and the inner end 474 of the oil introduction portion 47, between the upper end portion and the molding accommodating portion 41 or between the lower end portion and the molding accommodating portion 41. The flow of hydraulic oil is suppressed by the corners.

On the other hand, in the present embodiment, the oil introduction portion 47 has an outer end portion 473 and an inner end portion 474 formed in a curved surface shape. Therefore, the hydraulic oil flowing between the upper end portion and the molding accommodating portion 41 and the hydraulic oil flowing between the lower end portion and the molding accommodating portion 41 have corners formed at the outer end portion 473 and the inner end portion 474. It is possible to promote the flow of hydraulic oil in the molding oil chamber 46 as compared with the case where. Therefore, in the press molding machine 1, the air mixed in the molding oil chamber 46 is transferred to the pressurized oil flow path portion 21 and the pressure boosting oil as compared with the case where the corner portions are formed at the outer end portion 473 and the inner end portion 474. It can be easily discharged to the oil storage unit 50 through the chamber 20.

(Other embodiments)
Although the typical embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and can be variously modified as follows, for example.

In the above-described embodiment, an example in which the pressure boosting cylinder portion 10 has the cylinder lid portion 15 has been described, but the present invention is not limited thereto. For example, the pressure boosting cylinder portion 10 may have a configuration that does not have the cylinder lid portion 15.

Further, the cylinder lid portion 15 is composed of a lid main body portion 16 and a lid sealing portion 17, and is formed so that the inner peripheral portion of the lid sealing portion 17 slides on the outer peripheral portion of the piston 13. Although the example in which the lid groove portion 18 is provided has been described, the present invention is not limited to this. For example, the cylinder lid portion 15 is not separately configured as the lid main body portion 16 and the lid sealing portion 17, and the lid main body portion 16 and the lid sealing portion 17 may be integrally configured. Further, the lid groove portion 18 may be formed at the central portion of the inner peripheral portion of the cylinder lid portion 15.

Further, in the above-described embodiment, an example in which both the outer end portion 473 and the inner end portion 474 are formed in a curved surface shape has been described, but the present invention is not limited to this. For example, only one of the outer end portion 473 and the inner end portion 474 may be formed in a curved surface shape. Further, neither the outer end portion 473 nor the inner end portion 474 may be formed in a curved surface shape.

Needless to say, in the above-described embodiment, the elements constituting the embodiment are not necessarily essential except when it is clearly stated that they are essential and when they are clearly considered to be essential in principle.

In the above-described embodiment, when numerical values such as the number, numerical value, amount, range, etc. of the components of the embodiment are mentioned, when it is clearly stated that it is particularly essential, and in principle, it is clearly limited to a specific number. Except as the case, it is not limited to the specific number.

In the above-described embodiment, when referring to the shape, positional relationship, etc. of a component or the like, the shape, positional relationship, etc., unless otherwise specified or limited in principle to a specific shape, positional relationship, etc. It is not limited to.

(Summary)
According to the first aspect shown in part or all of the above-described embodiment, the press forming machine operated by the pressure of the hydraulic oil pressurizes the hydraulic oil by the driving force supplied from the drive unit. The cylinder part, the molding part that press-molds the molding material into a predetermined shape by the pressure of the hydraulic oil pressurized by the pressure-increasing cylinder part, and the pressurized oil flow path part that connects the pressure-increasing cylinder part and the molding part. , An oil storage unit that stores hydraulic oil for replenishment in the pressure boosting cylinder, a replenishment oil flow path that connects the pressure boost cylinder and the oil storage, and a replenishment oil flow path that opens and closes the replenishment oil flow path. It includes an opening / closing unit and a control unit that controls the operation of the driving unit and the replenishing oil flow path opening / closing unit.

The pressure boosting cylinder portion is formed in a bottomed shape that extends in the vertical direction, the upper end is opened, and the lower end is closed, and the inside of the cylinder that is the inner peripheral portion of the cylinder by the driving force supplied from the driving portion. It has a piston that slides and moves on the peripheral portion, and a boosting oil chamber that is partitioned by the inner peripheral portion of the cylinder and the piston and pressurizes hydraulic oil. The piston is configured to be movable below the initial position of the piston, which is the position of the piston in which the hydraulic oil lubricated into the boosting oil chamber is in a non-pressurized state. The booster oil chamber is located lower than the bottom surface of the oil storage section. One end of the refill oil flow path is connected to an oil injection hole provided at the top of the boosting oil chamber when the piston is in the initial position of the piston, and the other end is an oil supply hole provided on the bottom surface of the oil storage unit. It is connected to the.

When performing press molding, the control unit controls the drive unit so that the position of the piston is lower than the initial position of the piston, and controls the replenishment oil flow path opening / closing unit so that the replenishment oil flow path is closed. When press molding is not performed, the drive unit is controlled so that the position of the piston is the initial position of the piston, and the replenishment oil flow path opening / closing unit is controlled so that the replenishment oil flow path portion is in an open state.

According to the second aspect, the pressure boosting cylinder portion has a tubular cylinder lid portion at a position of closing the cylinder opening which is the upper end portion of the cylinder. The piston is inserted through the cylinder lid portion from the upper side to the lower side of the cylinder. The cylinder lid portion is formed with a lid sliding portion that slides on the outer peripheral portion of the piston and a lid groove portion that is recessed in a direction away from the axis of the cylinder lid portion on the inner peripheral portion of the cylinder lid portion. The lid groove is lubricated with hydraulic oil inside.

According to this, even if a gap is formed between the inner peripheral portion of the cylinder and the outer peripheral portion of the piston, the press molding machine can allow the hydraulic oil lubricated in the lid groove portion to flow into the gap. Therefore, the press molding machine can prevent air from being mixed into the pressure boosting oil chamber.

According to the third aspect, the molded portion has a molded accommodating portion formed in a hollow shape. The molding accommodating portion includes a mold portion filled with a molding material, an oil introduction portion which is arranged along the inner wall portion of the molding accommodating portion and introduces hydraulic oil around the mold portion, and a mold portion and an oil introduction portion. A molding oil chamber formed between them to lubricate hydraulic oil is housed, and a pressurized oil flow path portion is connected to a storage hole portion penetrating the outer shell of the molding housing portion. The oil introduction portion is formed in a hollow shape, and has an oil introduction outer shell surface which is a surface constituting the outer shell of the oil introduction portion, an oil introduction inner shell surface which is a surface constituting the inner shell of the oil introduction portion, and oil. It has a plurality of penetrating portions that penetrate from the introduction outer shell surface toward the oil introduction inner shell surface and communicate with the accommodating hole portion. At least one of the outer end portion, which is the end portion of the oil-introduced outer shell surface, and the inner end portion, which is the end portion of the oil-introduced inner shell surface, is formed in a curved surface shape.

According to this, the hydraulic oil flowing between the upper end portion and the molding accommodating portion and the hydraulic oil flowing between the lower end portion and the molding accommodating portion have corners formed at the outer end portion and the inner end portion. In comparison with, the flow of hydraulic oil in the molding oil chamber can be promoted. Therefore, the press molding machine allows the air mixed in the molding oil chamber to pass through the pressurized oil flow path portion and the pressure boosting oil chamber as compared with the case where the corner portions are formed at the outer end portion and the inner end portion. It can be easily discharged to the oil storage part.

10 Pressure boosting cylinder part 20 Pressure boosting oil chamber 22 Oil injection hole 40 Molding part 50 Oil storage part 51 Oil supply hole 52 Replenishment oil flow path part 53 Replenishment oil flow path opening / closing part 100 Control unit

Claims (3)

A press molding machine that operates under the pressure of hydraulic oil.
The pressure boosting cylinder unit (10) that pressurizes the hydraulic oil by the driving force supplied from the drive unit (2), and
A molding part (40) that press-molds a molding material into a predetermined shape by the pressure of the hydraulic oil pressurized by the pressure boosting cylinder part.
A pressurized oil flow path portion (21) connecting the pressure boosting cylinder portion and the molding portion, and
An oil storage unit (50) for storing the hydraulic oil for replenishing the pressure boosting cylinder unit, and
A replenishment oil flow path portion (52) connecting the pressure boosting cylinder portion and the oil storage portion, and
A replenishment oil flow path opening / closing portion (53) for opening / closing the replenishing oil flow path portion,
A control unit (100) that controls the operation of the drive unit and the replenishment oil flow path opening / closing unit is provided.
The pressure boosting cylinder portion is formed by a bottomed cylinder (11) that extends in the vertical direction, has an upper end open, and a lower end is closed, and the driving force supplied from the driving portion of the cylinder. A booster oil chamber (a pressure-increasing oil chamber) formed by a piston (13) that slides and moves on an inner peripheral portion (111) of a cylinder, which is an inner peripheral portion, and the inner peripheral portion of the cylinder and the piston, and is lubricated with the hydraulic oil. 20) and
The piston is configured to be movable below the initial position of the piston, which is the position of the piston in which the hydraulic oil lubricated into the boosting oil chamber is in a non-pressurized state.
The pressure boosting oil chamber is arranged at a position lower than the bottom surface of the oil storage unit.
One end side of the replenishment oil flow path portion is connected to an oil injection hole (22) provided at the uppermost portion of the boosting oil chamber when the piston is in the initial position of the piston, and the other end side is the oil storage portion. It is connected to the oil supply hole (51) provided on the bottom surface.
When the press molding is performed, the control unit controls the drive unit so that the position of the piston is lower than the initial position of the piston, and the replenishment unit closes the replenishment oil flow path portion. When the oil flow path opening / closing part is controlled and the press molding is not performed, the drive part is controlled so that the position of the piston becomes the piston initial position, and the replenishment oil flow path part is opened. A press molding machine that controls the replenishment oil flow path opening / closing portion. The pressure boosting cylinder portion has a tubular cylinder lid portion (15) at a position that closes the cylinder opening (112) which is the upper end portion of the cylinder.
The piston is inserted through the cylinder lid portion from the upper side to the lower side of the cylinder.
The cylinder lid portion is formed by a lid sliding portion (171) that slides on the outer peripheral portion of the piston and a lid groove portion that is recessed in a direction away from the axis of the cylinder lid portion in the inner peripheral portion of the cylinder lid portion. (18) is formed
The press molding machine according to claim 1, wherein the lid groove portion is lubricated with the hydraulic oil inside. The molded portion has a molded accommodating portion (41) formed in a hollow shape.
The molding accommodating portion is arranged along a mold portion (45) filled with the molding material and an inner wall portion of the molding accommodating portion, and an oil introduction portion (47) for introducing the hydraulic oil around the mold portion. ) And a molding oil chamber (46) formed between the mold portion and the oil introduction portion to lubricate the hydraulic oil, and a storage hole portion (411) penetrating the outer shell of the molding storage portion. The pressurized oil flow path is connected to the
The oil introduction portion is formed in a hollow shape, and has an oil introduction outer shell surface (62) which is a surface forming the outer shell of the oil introduction portion and an oil introduction surface which is a surface forming the inner shell of the oil introduction portion. It has an inner shell surface (61) and a plurality of penetrating portions (49) that penetrate from the oil-introduced outer shell surface toward the oil-introduced inner shell surface and communicate with the accommodating hole.
Claim that at least one of the outer end portion (473) which is the end portion of the oil-introduced outer shell surface and the inner end portion (474) which is the end portion of the oil-introduced inner shell surface is formed in a curved surface shape. The press molding machine according to 1 or 2.

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