Press Equipment

Abstract

To make it possible to discharge gas inside a metal mold while suppressing manufacturing costs of a press device.SOLUTION: A press device forms an internal gas flow path, has a first press part and a second press part, and includes: a press machine; a positive-displacement pump which includes a displacement member and in which a capacity of an internal space changes; a pressing member which is connected to the first press part, presses the displacement member to decrease the capacity of the space as the first press part approaches the second press part, moves in the direction away from the displacement member to increase the capacity of the internal space as the first press part moves away from the second press part; an external gas flow path connecting the internal gas flow path and the internal space; a switch valve which is provided in the external gas flow path and switches a first state that the external gas flow path is opened to the atmosphere and a second state that the external gas flow path is not opened to the atmosphere; and a control device which controls the switch valve, causes the first state when the first press part approaches the second press part and causes the second state when the first press part moves away from the second press part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a press apparatus. [Background technology]

[0002] Press machines are sometimes used to process materials. Patent Document 1 discloses a press machine that removes scrap, which is an unnecessary part separated from a workpiece. In such a press machine, compressed air generated during press working is used as air for discharging the scrap in the trimming process that follows the press working. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-304798 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned press apparatus, depending on the type of material used for the object to be pressed and the configuration of the object to be pressed, gas may be generated from the object during pressing, and the gas may adhere to the press die and solidify. For example, in a configuration in which an adhesive is used for the object to be pressed, gas may be generated from the adhesive component vaporized during pressing, and the gas may adhere to the die. In such a case, there is a problem that the adhered material of the die is transferred to the object to be pressed during subsequent pressing, causing contamination or deformation of the object to be pressed. In addition, in a configuration in which a vacuum pump is used to exhaust the gas generated from the object during pressing from the internal space of the die by applying the "exhaust using compressed air" in Patent Document 1, there is a problem that the manufacturing cost of the entire press apparatus increases. [Means for solving the problem]

[0005] The present disclosure can be realized in the following forms. [Feature 1] A press device having an internal gas flow path formed therein, a first press section that moves one of a pair of dies, and a second press section that fixes the other die, the press machine pressing a workpiece sandwiched between the pair of dies, a positive displacement pump that includes a displacement member and changes the volume of the internal space in accordance with the displacement of the displacement member, a pressing member connected to the first press unit, the pressing member pressing the displacement member to reduce a volume of the internal space as the first press unit moves toward the second press unit, and the pressing member moving in a direction away from the displacement member to increase a volume of the internal space as the first press unit moves away from the second press unit; an external gas flow path connecting the internal gas flow path and the internal space; a changeover valve provided in the external gas flow path, the changeover valve switching between a first state in which the external gas flow path is open to the atmosphere and a second state in which the external gas flow path is not open to the atmosphere; and a control device controlling the changeover valve, the control device controlling the changeover valve to the first state when the first press unit approaches the second press unit, and controlling the changeover valve to the second state when the first press unit moves away from the second press unit, wherein the control device controls the changeover valve such that the first state and the second state are alternately repeated as the first press unit moves.

[0006] According to one aspect of the present disclosure, there is provided a press apparatus, the press apparatus including a first press section having an internal gas flow path formed therein, which moves one of a pair of dies, and a second press section which fixes the other die, and which presses a workpiece sandwiched between the pair of dies, a positive displacement pump including a displacement member and in which a volume of an internal space changes with the displacement of the displacement member, and a positive displacement pump connected to the first press section, which pushes the displacement member to reduce the volume of the internal space as the first press section moves toward the second press section, and which moves away from the displacement member as the first press section moves away from the second press section. the pressing member moving in a direction away from the first press unit to increase the volume of the internal space; an external gas flow path connecting the internal gas flow path and the internal space; a changeover valve provided in the external gas flow path and switching between a first state in which the external gas flow path is open to the atmosphere and a second state in which the external gas flow path is not open to the atmosphere; and a control device for controlling the changeover valve, the control device controlling the changeover valve to the first state when the first press unit approaches the second press unit, and controlling the changeover valve to the second state when the first press unit moves away from the second press unit. According to the press apparatus of this embodiment, the pressing member that moves with the movement of the first press section increases and decreases the volume of the positive displacement pump. In addition, the control device controls the switching valve to the first state when the first press section approaches the second press section, and controls the switching valve to the second state when the first press section moves away from the second press section. Therefore, the negative pressure generated in the positive displacement pump can exhaust gas generated from the object to be pressed from the space within the die. As a result, it is possible to suppress the transfer of the solid matter of the die to the object to be pressed, which causes the object to be contaminated or deformed. In addition, it is possible to suppress an increase in the manufacturing cost of the entire press apparatus, compared to a configuration in which a vacuum pump is used to exhaust gas generated from the object during pressing from the internal space of the die. [Brief description of the drawings]

[0007] [Figure 1]FIG. 1 is an explanatory diagram illustrating a schematic configuration of a press device according to an embodiment of the present disclosure. [Diagram 2] FIG. 1 is a schematic diagram for explaining volatiles immediately after the first press section moves toward the second press section and the workpiece is pressed. [Diagram 3] FIG. 1 is a schematic diagram for explaining the state of volatile matter immediately after the first press section moves in a direction away from the second press section. [Figure 4] 5 is a flowchart showing a procedure of a control process of the press apparatus. [Diagram 5] FIG. 11 is a schematic diagram for explaining the state of the press apparatus when steps S10 and S12 are performed. [Figure 6] FIG. 11 is a schematic diagram for explaining the state of the press apparatus when steps S14 and S16 are executed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] A. Embodiment: A1. Overall configuration of the press equipment: FIG. 1 is an explanatory diagram showing a schematic configuration of a press device 50 according to an embodiment of the present disclosure. The press device 50 presses a workpiece 30 using a die 12, and discharges volatile matter generated from the workpiece 30 during pressing from the space inside the die 12 to the atmosphere. The die 12 is composed of a pair of dies. Specifically, the die 12 is composed of a movable die 12a and a fixed die 12b. The pair of dies 12 are detachably attached to a press machine 10. A through hole is formed in the movable die 12a, and the through hole communicates with internal gas channels 18a and 18b described later. The press device 50 includes the press machine 10, a positive displacement pump 14, a pressing member 16, an external gas channel 19, a switching valve 20, and a control device 22.

[0009] The press machine 10 presses the workpiece 30 sandwiched between a pair of dies 12. The press machine 10 has a first press section 10a and a second press section 10b. One movable die 12a of the pair of dies 12 is attached to the first press section 10a.

[0010] The second press unit 10b fixes the other fixed die 12b of the pair of dies 12. The workpiece 30 is placed on the surface of the fixed die 12b that faces the movable die 12a.

[0011] The first press unit 10a is moved by an actuator (not shown) under the control of the control device 22 in a direction approaching the second press unit 10b and in the opposite direction. Accordingly, the movable die 12a of the pair of dies 12 is moved. Internal gas flow paths 18a, 18b are formed inside the first press unit 10a. As shown in FIG. 1, the internal gas flow paths 18a, 18b communicate with the through holes of the movable die 12a described above.

[0012] FIG. 2 is a schematic diagram for explaining the volatiles Vt immediately after the first press section 10a moves in a direction approaching the second press section 10b and the workpiece 30 is pressed. FIG. 3 is a schematic diagram for explaining the state of the volatiles Vt immediately after the first press section 10a moves in a direction away from the second press section 10b. For convenience of illustration, only some components of the press device 50 are shown in FIG. 2 and FIG. 3, and other components are omitted. In FIG. 3, the workpiece 30 is also omitted.

[0013] 2, when the workpiece 30 is pressed by the movable die 12a and the fixed die 12b, volatile matter Vt is generated from the pressed workpiece 30. The volatile matter Vt may be, for example, a gas containing components that are volatilized from the organic material portion contained in the workpiece 30.

[0014] As shown in Fig. 3, the volatile matter Vt generated by pressing the workpiece 30 floats in the space within the pair of dies 12 immediately after the first press part 10a moves in a direction away from the second press part. In this embodiment, the floating volatile matter Vt is discharged from the space within the pair of dies 12 to the atmosphere, as described below. Note that even in the state of Fig. 3, a portion of the volatile matter Vt generated from the workpiece 30 is discharged from within the space within the dies 12 to outside the space.

[0015] The positive displacement pump 14 shown in FIG. 1 sucks volatiles Vt from the space inside the mold 12 through the internal gas passages 18a, 18b and the external gas passage 19. The positive displacement pump 14 includes a displacement member 14a. In the positive displacement pump 14, the volume of the internal space Ins changes with the displacement of the displacement member 14a. In this embodiment, the positive displacement pump 14 is a foot pump. Therefore, the above-mentioned "displacement member 14a" corresponds to a part of the outer periphery of the air chamber that constitutes the surface pressed by the pressing member 16. Note that the positive displacement pump 14 is not limited to a foot pump, and may be any other type of positive displacement pump.

[0016] As shown in FIG. 1, the pressing member 16 is a rod-shaped member having a generally L-shaped external shape. One end of the pressing member 16 is connected to the first press unit 10a. The other end of the pressing member 16 is in contact with the displacement member 14a of the positive displacement pump 14 in FIG. 1, but may not be in contact before or after pressing. As the first press unit 10a moves toward the second press unit 10b, the pressing member 16 moves toward the positive displacement pump 14 and presses the displacement member 14a. As a result, the volume of the internal space Ins of the positive displacement pump 14 decreases. Also, as the first press unit 10a moves away from the second press unit 10b, the pressing member 16 moves in a direction away from the displacement member 14a. As a result, the volume of the internal space Ins of the positive displacement pump 14 increases.

[0017] The external gas flow passage 19 connects the internal gas flow passages 18a and 18b with the internal space Ins of the positive displacement pump 14. Specifically, as shown in FIG. 1, the external gas flow passage 19 is formed by the external gas flow passages 19a to 19d. The external gas flow passages 19a and 19b are connected to the internal gas flow passages 18a and 18b, respectively. The external gas flow passage 19c is connected to the external gas flow passages 19a, 19b, and 19d. The external gas flow passage 19d is connected to the external gas flow passages 19a and 19c. The external gas flow passage 19d is a flow passage where the volatile matter Vt flowing from the internal gas flow passages 18a and 18b join together. The external gas flow passage 19d is connected to the external gas flow passage 19d, and the external gas flow passage 19d is connected to the internal space Ins of the positive displacement pump 14.

[0018] As shown in FIG. 1, the switching valve 20 is provided in the external gas flow passage 19d. The switching valve 20 is a three-way valve. Under the control of the control device 22, the switching valve 20 is switched between a first state in which the external gas flow passage 19d is open to the atmosphere and a second state in which the external gas flow passage 19d is not open to the atmosphere. The "first state" refers to a state in which the switching valve 20 is closed and the external gas flow passage 19d is open to the atmosphere. At this time, the internal space Ins of the positive displacement pump 14 and the space in the pair of dies 12 are not in communication with each other. On the other hand, the "second state" refers to a state in which the switching valve 20 is opened and the external gas flow passage 19d is not in communication with the atmosphere. At this time, the internal space Ins of the positive displacement pump 14 and the space in the pair of dies 12 are in communication with each other.

[0019] 1 controls the movement of the first press unit 10a via an actuator (not shown). During the movement of the first press unit, the control unit 22 also controls the switching valve 20 to set the external gas passage 19d to a first state in which it is open to the atmosphere, or to a second state in which it is not open to the atmosphere.

[0020] A2. Press device control process: 4 is a flowchart showing the procedure of the control process of the press apparatus 50. The control process of the press apparatus is a process for performing a pressing operation of the press machine and discharging volatiles Vt generated from the workpiece 30 in association with the pressing operation from the space within the pair of dies 12. When the pair of dies 12 is set in the press machine 10, the workpiece 30 is placed on the fixed die 12b, and a user issues an instruction to start pressing to the control device 22, the control device 22 starts the control process of the press apparatus 50.

[0021] 1 in which the movable die 12a has risen all the way to the top, the control device 22 controls the first press unit 10a to move closer to the second press unit 10b (step S10). With the processing of step S10, the pressing member 16 presses the displacement member 14a of the positive displacement pump 14. The control device 22 controls the switching valve 20 to close (step S12). With the processing of step S12, the first state is reached in which the external gas flow path 19d is open to the atmosphere.

[0022] 5 is a schematic diagram for explaining the state of the press device 50 during execution of steps S10 and S12. As shown in FIG. 5, volatiles Vt are generated from the workpiece 30 pressed by the movable die 12a and the fixed die 12b. Furthermore, since the switching valve 20 is closed by the process of step S12, the external gas flow path 19d is open to the atmosphere. Therefore, the gas in the positive displacement pump 14 is discharged to the atmosphere through the switching valve 20 as shown by the dashed line Flo. The state in which the external gas flow path 19d is open to the atmosphere in this way is the first state described above.

[0023] 4, the control device 22 controls the first press unit 10a to move away from the second press unit 10b (step S14). As a result of the processing of step S14, the pressing member 16 moves in a direction away from the displacement member 14a of the positive displacement pump 14. The control device 22 opens the switching valve 20 (step S16). As a result of the processing of step S16, the external gas passage 19d becomes in a second state in which it is not open to the atmosphere.

[0024] 6 is a schematic diagram for explaining the state of the press device 50 during execution of steps S14 and S16. As shown in FIG. 6, when the pressing member 16 is released from the pressing force, the displacement member 14a moves upward. At this time, the external gas flow passage 19 and the internal gas flow passages 18a and 18b are sucked to a negative pressure, and the volatile matter Vt present in the space in the mold 12 communicating with the internal gas flow passages 18a and 18b is sucked into the external gas flow passage 19 through the internal gas flow passages 18a and 18b. At this time, the switching valve 20 is open, so that the external gas flow passage 19 is not open to the atmosphere, and the sucked volatile matter Vt is directed toward the internal space Ins of the positive displacement pump 14.

[0025] As shown in FIG. 4, after the processing of step S16, the control processing of the press device 50 is repeated, and the volatile matter Vt sucked up by the positive displacement pump 14 is discharged to the atmosphere via the path indicated by the dashed line Flo in FIG. 5 the next time steps S10 and S12 are executed.

[0026] According to the press apparatus 50 of the present embodiment described above, the pressing member 16, which moves with the movement of the first press section 10a, increases and decreases the volume of the positive displacement pump 14. In addition, the control device 22 controls the switching valve 20 to the first state when the first press section 10a approaches the second press section 10b, and controls the switching valve 20 to the second state when the first press section 10a moves away from the second press section 10b. Therefore, the negative pressure generated in the positive displacement pump 14 can exhaust the gas generated from the workpiece 30 from the space within the die 12. As a result, it is possible to suppress the transfer of the solidified matter of the die 12 to the workpiece 30, which causes the workpiece 30 to be contaminated or deformed. In addition, it is possible to suppress an increase in the manufacturing cost of the entire press apparatus 50, compared to a configuration in which a vacuum pump is used to exhaust the gas generated from the workpiece 30 from the internal space of the die 12 during pressing.

[0027] B. Other embodiments: (B1) In the press device 50 of the above embodiment, the internal gas flow paths 18a, 18b are two, but the number is not limited to two and may be any number.

[0028] (B2) In the press machine 50 of the above embodiment, the switching valve 20 is a three-way valve, but is not limited to this. As in the above embodiment, any type of valve may be used as long as it can switch between a state in which the external gas passage 19 is open to the atmosphere and a state in which the external gas passage 19 is not open to the atmosphere. For example, it may be a four-way valve.

[0029] (B3) In the press device 50 of the above embodiment, the workpiece 30 is pressed by the movable die 12a and the fixed die 12b, but the workpiece 30 may be pressed in the lateral direction.

[0030] (B4) In the press apparatus 50 of the above embodiment, the volatile matter Vt discharged from the internal space in the die 12 is a gas containing components that are volatilized from the organic material portion contained in the workpiece 30, but the present disclosure is not limited to this. For example, even a gas generated by a chemical reaction between substances contained in the workpiece 30 may be discharged from the internal space in the die 12, without being limited to such volatile matter Vt.

[0031] The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features of the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention can be appropriately replaced or combined to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0032] 10...press machine, 10a...first press section, 10b...second press section, 12...mold, 12a...movable die, 12b...fixed die, 14...positive displacement pump, 14a...displacement member, 16...pressing member, 18a...internal gas flow path, 19, 19a, 19b, 19c, 19d...external gas flow path, 20...switching valve, 22...control device, 30...workpiece, 50...pressing device, Flo...dashed line, Ins...internal space, Vt...volatile matter

Claims

[Claim 1] A press device, comprising: a press machine having an internal gas flow path formed therein, a first press section for moving one of a pair of dies, and a second press section for fixing the other die, and for pressing a workpiece sandwiched between the pair of dies; a positive displacement pump including a displacement member, the volume of an internal space of which changes with the displacement of the displacement member; a pressing member connected to the first press unit, pressing the displacement member to reduce the volume of the internal space as the first press unit moves toward the second press unit, and moving in a direction away from the displacement member to increase the volume of the internal space as the first press unit moves away from the second press unit; an external gas flow passage connecting the internal gas flow passage and the internal space; a switching valve provided in the external gas flow passage and switching between a first state in which the external gas flow passage is open to the atmosphere and a second state in which the external gas flow passage is not open to the atmosphere; a control device that controls the switching valve to be in the first state when the first press unit approaches the second press unit, and controls the switching valve to be in the second state when the first press unit moves away from the second press unit; and Equipped with The control device controls the switching valve so that the first state and the second state are alternately repeated in accordance with the movement of the first press part.

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